[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
We are waiting for the new kernel too as we are currently blocked with new installations based on 18.04 LTS. Can you please give a date when it will be ready? Thanks! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
Thank you for your analysis and test kernel. A lot of our machines (Supermicro X11 / Xeon W-2133 based) also suffer from the problem introduced by 4.15.0-177. I can confirm that the kernel 4.15.0-182-generic #191+lp1973167 provided by Kai-Heng Feng fixes the issue on my HW. Could you please proceed with the roll-out of this patch? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
Here's a test kernel with the commit: https://people.canonical.com/~khfeng/lp1973167/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
Same problem here. Can't boot anything after 4.15.0-176. Boot sequence falls into the emergency mode or never boots. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
Same problem here with ASUS VivoBook X510U -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
Hi! After all, I am lucky: my Dell Latitude 5480 succeeds sometimes to start XUbuntu 18.04.6 LTS normally, but often freezes on boot because "A start job is running for ..." (several messages of this type), both with linux-image-4.15.0-177-generic and linux-image-4.15.0-180-generic, while everything goes fine with linux-image-4.15.0-166-generic (which I installed back). I will give a try with 176. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
I'm on a Dell Precision 3520 with Kubuntu 18.04, I have the same issue with 4.15.0-177 and 4.15.0-180. This also seems to disable my sound, bluetooth, and wifi. Currently booting 4.15.0-176. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
It affects to: Kubuntu 18.04, Dell Latitude 7490. I could start by blacklisting the intel-lpss-pci module (in this case the mouse doesn't work) and loading it again after boot (the mouse works again fine). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
** Also affects: linux (Ubuntu Bionic) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Bionic) Status: New => Confirmed ** Changed in: linux (Ubuntu Bionic) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
FIXED IT! It is indeed the intel_lpss driver, at least in my case. This commit: https://kernel.ubuntu.com/git/ubuntu/ubuntu-bionic.git/commit/kernel/module.c?h=Ubuntu-4.15.0-177.186=3879f4364139acb2bd3932e6a15994f109c49d6b will not work right when a module that is asynchronously loaded tries to synchronously load a module, which is not (or no longer?) allowed. It appears the intel_lpss driver did just that until this commit: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/mfd/intel- lpss.c?id=569fac74627cc332a2097a7a4bfdc654b8e7f273 But this commit has not been backported to the 4.15 kernel, so the intel_lpss driver delivered with the 4.15.0-177 kernel package does not have it. Applying this commit to the 4.15.0-177 source tree, rebuilding and replacing (only!) the intel_lpss.ko module makes the kernel load without delays for me. I confirmed the same with kernel 4.15.0-180. So now we only need to convince the Ubuntu maintainers to backport https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/mfd/intel- lpss.c?id=569fac74627cc332a2097a7a4bfdc654b8e7f273 to the 4.15 kernel... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
My "prime suspect" is this commit: https://kernel.ubuntu.com/git/ubuntu/ubuntu-bionic.git/commit/kernel/module.c?h=Ubuntu-4.15.0-177.186=3879f4364139acb2bd3932e6a15994f109c49d6b Also see Linus' comments when this patch was submitted to the mainline kernel: https://www.spinics.net/lists/kernel/msg4223720.html "that might be a big deal slowing things down at boot time. [...] Comments? Maybe this is a "just apply it, see if somebody screams" situation?" From what I understand, other measures taken in the kernel and modules make this issue no longer occur, so my hypothesis is that this may not have caused issues in the current kernel. So the mistake was that Canonical backported this commit to a very old kernel version that kernel.org no longer maintains... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
I have found a change between 176 and 177 that looks suspicious:
diff -upr --color 176/linux-source-4.15.0/kernel/module.c
177/linux-source-4.15.0/kernel/module.c
--- 176/linux-source-4.15.0/kernel/module.c 2022-03-29 19:39:48.0
+0200
+++ 177/linux-source-4.15.0/kernel/module.c 2022-04-14 22:22:50.0
+0200
@@ -3520,22 +3514,13 @@ static noinline int do_init_module(struc
- /*
-* We need to finish all async code before the module init sequence
-* is done. This has potential to deadlock. For example, a newly
-* detected block device can trigger request_module() of the
-* default iosched from async probing task. Once userland helper
-* reaches here, async_synchronize_full() will wait on the async
-* task waiting on request_module() and deadlock.
-*
-* This deadlock is avoided by perfomring async_synchronize_full()
-* iff module init queued any async jobs. This isn't a full
-* solution as it will deadlock the same if module loading from
-* async jobs nests more than once; however, due to the various
-* constraints, this hack seems to be the best option for now.
-* Please refer to the following thread for details.
-*
-* http://thread.gmane.org/gmane.linux.kernel/1420814
-*/
- if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC))
+ /*
+* We need to finish all async code before the module init sequence
+* is done. This has potential to deadlock if synchronous module
+* loading is requested from async (which is not allowed!).
+*
+* See commit 0fdff3ec6d87 ("async, kmod: warn on synchronous
+* request_module() from async workers") for more details.
+*/
+ if (!mod->async_probe_requested)
async_synchronize_full();
Maybe this is the deadlock we're all running into...?
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[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
> I just installed kernel 4.15.0-180 ... problem is still there Also for me - no problem in -176, but problems in -177 and -180. If there's logs that it'd be useful to see, just ask. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
I just installed kernel 4.15.0-180 ... no change ... problem is still there :-( -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
Trying to isolate the issue, I: 1. Booted my portable Ubuntu 18.04.6 installation on a different machine (different CPU, chipset, but still Intel). On the other machine, kernel 4.15.0-177 booted without issues, so apparently it does not depend on the installation, but rather on the hardware or BIOS whether the freeze occurs or not. 2. Replaced the entire /lib/modules/4.15.0-177-generic/ with the contents from /lib/modules/4.15.0-176-generic/ and rebuilt initramfs. This did NOT cure the freezes (only caused a lot of module signature errors, confirming that the modules really were replaced). So whatever is causing the freezes is not in one of loadable modules, but rather within the kernel itself or the builtin modules. Still, the 176-to-177 diff over the builtin modules is HUGE... :-/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
Have the same problem on ThinkPad T480s and 18.04.6 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
Also effected - Asus UX430UA Intel I5 running Ubuntu 18.04.6 Noticed 3m delay when processing UFW and possibly boot/efi. Also effected sound, not checked other functions. Reverting to 4.15.0-176 resolves the problem Not sure what log to upload - please advise. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
I'm affected too Ubuntu 18.04.6 LTS, Asus UX305UA ** Attachment added: "lshw.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+attachment/5591492/+files/lshw.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
I'm affected too. Kubuntu 18.04, Acer Aspire 5 (A517-51G-5826), NVIDIA GeForce MX130 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
A similar issue here, different hardware and graphics to above machine. Dell 5000, Ubuntu 18.04, boots OK off "4.15.0-176-generic" but with "Linux 4.15.0-177-generic" hangs at the welcome screen. "sudo lspci -vnvn" (when booted off 4.15.0-176-generic) returns: 00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers [8086:5914] (rev 08) Subsystem: Dell Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers [1028:0808] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- SERR- Kernel driver in use: skl_uncore 00:02.0 VGA compatible controller [0300]: Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA controller]) Subsystem: Dell UHD Graphics 620 [1028:0808] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- Capabilities: [70] Express (v2) Root Complex Integrated Endpoint, MSI 00 DevCap: MaxPayload 128 bytes, PhantFunc 0 ExtTag- RBE+ DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported- RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop- MaxPayload 128 bytes, MaxReadReq 128 bytes DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend- DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit- Address: fee00018 Data: Capabilities: [d0] Power Management version 2 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- Capabilities: [100 v1] Process Address Space ID (PASID) PASIDCap: Exec- Priv-, Max PASID Width: 14 PASIDCtl: Enable- Exec- Priv- Capabilities: [200 v1] Address Translation Service (ATS) ATSCap: Invalidate Queue Depth: 00 ATSCtl: Enable-, Smallest Translation Unit: 00 Capabilities: [300 v1] Page Request Interface (PRI) PRICtl: Enable- Reset- PRISta: RF- UPRGI- Stopped+ Page Request Capacity: 8000, Page Request Allocation: Kernel driver in use: i915 Kernel modules: i915 00:04.0 Signal processing controller [1180]: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem [8086:1903] (rev 08) Subsystem: Dell Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem [1028:0808] Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- SERR- Kernel driver in use: proc_thermal Kernel modules: processor_thermal_device 00:13.0 Non-VGA unclassified device []: Intel Corporation Sunrise Point-LP Integrated Sensor Hub [8086:9d35] (rev 21) Subsystem: Dell Sunrise Point-LP Integrated Sensor Hub [1028:0808] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- Kernel driver in use: intel-lpss Kernel modules: intel_lpss_pci 00:16.0 Communication controller [0780]: Intel Corporation Sunrise Point-LP CSME HECI #1 [8086:9d3a] (rev 21) Subsystem: Dell Sunrise Point-LP CSME HECI [1028:0808] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00 DevCap: MaxPayload 256 bytes, PhantFunc 0 ExtTag- RBE+ DevCtl: Report errors: Correctable+ Non-Fatal+ Fatal+ Unsupported+ RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop- MaxPayload 256 bytes, MaxReadReq 128 bytes DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend- LnkCap: Port #6, Speed 8GT/s, Width x1, ASPM L1, Exit Latency L0s <1us, L1 <16us ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+ LnkCtl: ASPM L1 Enabled; RCB 64 bytes Disabled- CommClk+
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
Alas! I spoke to seen. The seeming "workaround" only lasted for one
boot, and after that, the ~180 seconds delay is back to stay, although
the Intel IOMMU is still disabled.
So this issue is "sporadic". Maybe even a race condition... :(
And maybe not even related to the intel-lpss driver: The line:
"intel-lpss :00:15.0: enabling device ( -> 0002)"
seems to come from drivers/pci/setup-res.c:
if (cmd != old_cmd) {
dev_info(>dev, "enabling device (%04x -> %04x)\n",
old_cmd, cmd);
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
So it just enables the PCI device, which at some point leads to
drivers/mfd/intel-lpss.c#intel_lpss_probe() being called which requests
the DMA module leading to drivers/dma/idma64.c#idma64_probe() being
called which finally outputs:
dev_info(chip->dev, "Found Intel integrated DMA 64-bit\n");
So a lot of code between these two log lines:
[6.439056] intel-lpss :00:15.0: enabling device ( -> 0002)
[ 187.141427] idma64 idma64.0: Found Intel integrated DMA 64-bit
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linux-image-4.15.0-177-generic freezes on the welcome screen
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[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
After grepping dmesg for all lines about the "00:15" devices, I found two lines starting with "DMAR:", which made me think of another machine running debian which had issues with DMAR: devices that were related to the Intel IOMMU. So I tried the workaround I knew from there: Edit /etc/default/grub and add "intel_iommu=off" to the GRUB_CMDLINE_LINUX_DEFAULT value, then run "sudo update-grub" to update the grub configuration and reboot. and voila, intel-lpss initializes within a few milliseconds again: [6.518592] intel-lpss :00:15.0: enabling device ( -> 0002) [6.560693] idma64 idma64.0: Found Intel integrated DMA 64-bit [6.569509] intel-lpss :00:15.1: enabling device ( -> 0002) [6.569691] idma64 idma64.1: Found Intel integrated DMA 64-bit [6.574164] mei_me :00:16.0: enabling device ( -> 0002) $ cat /proc/cmdline BOOT_IMAGE=/boot/vmlinuz-4.15.0-177-generic root=UUID= ro intel_iommu=off So some change between 4.15.0-176 and 4.15.0-177 seemingly broke the Intel IOMMU. Question is whether it was a formerly "dormant" BIOS bug that was only unveiled by some change, or whether it is a newly introduced Linux bug that broke Intel IOMMU support... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1973167] Re: linux-image-4.15.0-177-generic freezes on the welcome screen
After finding someone reporting the same issue (https://forums.linuxmint.com/viewtopic.php?t=373747=2175201) and reading that the machine may come alive after a while, I found that indeed after 3 minutes the machine works. dmesg that reveals that it seemingly was the initialization of the intel_lpss driver that took 3 minutes: [6.889189] intel-lpss :00:15.0: enabling device ( -> 0002) [7.112397] input: PC Speaker as /devices/platform/pcspkr/input/input5 [7.220480] RAPL PMU: API unit is 2^-32 Joules, 5 fixed counters, 655360 ms ovfl timer [7.220481] RAPL PMU: hw unit of domain pp0-core 2^-14 Joules [7.220481] RAPL PMU: hw unit of domain package 2^-14 Joules [7.220482] RAPL PMU: hw unit of domain dram 2^-14 Joules [7.220482] RAPL PMU: hw unit of domain pp1-gpu 2^-14 Joules [7.220483] RAPL PMU: hw unit of domain psys 2^-14 Joules [9.882380] IPv6: ADDRCONF(NETDEV_UP): eno1: link is not ready [ 10.068162] IPv6: ADDRCONF(NETDEV_UP): eno1: link is not ready [ 10.070009] IPv6: ADDRCONF(NETDEV_UP): eno2: link is not ready [ 10.115669] IPv6: ADDRCONF(NETDEV_UP): eno2: link is not ready [ 10.117735] IPv6: ADDRCONF(NETDEV_UP): enp2s0: link is not ready [ 10.61] IPv6: ADDRCONF(NETDEV_UP): enp2s0: link is not ready [ 14.114836] e1000e: eno1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx [ 14.114883] IPv6: ADDRCONF(NETDEV_CHANGE): eno1: link becomes ready [ 15.14] atlantic: link change old 0 new 1000 [ 15.200150] IPv6: ADDRCONF(NETDEV_CHANGE): enp2s0: link becomes ready [ 187.423062] intel-lpss :00:15.1: enabling device ( -> 0002) [ 187.432242] mei_me :00:16.0: enabling device ( -> 0002) [ 187.432264] shpchp: Standard Hot Plug PCI Controller Driver version: 0.4 [ 187.441672] AVX2 version of gcm_enc/dec engaged. [ 187.441673] AES CTR mode by8 optimization enabled [ 187.445619] idma64 idma64.0: Found Intel integrated DMA 64-bit [ 187.452528] idma64 idma64.1: Found Intel integrated DMA 64-bit Note these lines: [6.889189] intel-lpss :00:15.0: enabling device ( -> 0002) [ 187.423062] intel-lpss :00:15.1: enabling device ( -> 0002) [ 187.432242] mei_me :00:16.0: enabling device ( -> 0002) [ 187.445619] idma64 idma64.0: Found Intel integrated DMA 64-bit [ 187.452528] idma64 idma64.1: Found Intel integrated DMA 64-bit For comparison, the same lines from the 4.15.0-176 dmesg: [6.321873] intel-lpss :00:15.0: enabling device ( -> 0002) [6.340549] idma64 idma64.0: Found Intel integrated DMA 64-bit [6.345409] intel-lpss :00:15.1: enabling device ( -> 0002) [6.345610] idma64 idma64.1: Found Intel integrated DMA 64-bit [6.350618] mei_me :00:16.0: enabling device ( -> 0002) So the initialization time increased from 30ms of 180s, i.e. by a factor of 6,000. This cannot be right. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973167 Title: linux-image-4.15.0-177-generic freezes on the welcome screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
