Bug#1029968: Info received (Bug#1029968: Info received (Bug#1029968: Acknowledgement (bttv/v4l: WARNING: CPU: 6 PID: 6164 at mm/vmalloc.c:487 __vmap_pages_range_noflush+0x3e0/0x4d0)))
Confirmed still happens on upstream 6.2.0-rc6 -- -Open up your eyes, open up your mind, open up your code --- / Dr. David Alan Gilbert| Running GNU/Linux | Happy \ \dave @ treblig.org | | In Hex / \ _|_ http://www.treblig.org |___/
Bug#1029968: Acknowledgement (bttv/v4l: WARNING: CPU: 6 PID: 6164 at mm/vmalloc.c:487 __vmap_pages_range_noflush+0x3e0/0x4d0)
* Diederik de Haas (didi.deb...@cknow.org) wrote: > Thanks for that thorough analyses! Thanks for the reply, > If you're 'penguin42' on IRC, Yep, that's me. > then I'd suggest to present your findings to > io...@lists.linux.dev as both the author and the reviewer are highly likely > subscribed to that list. > > scripts/get_maintainer.pl drivers/iommu/dma-iommu.c > scripts/get_maintainer.pl kernel/dma/Makefile > > list them both and both results have also that ML in their result. Yep, will do; I'm just going to try a 6.2rc as well just in case it's got fixed very recently, and have a poke about in case I can see any obvious cause now I know the change that triggered it. I'll include the linux-media list as well since it's just as likely that it's a fault on the v4l/bttv driver. Dave > HTH -- -Open up your eyes, open up your mind, open up your code --- / Dr. David Alan Gilbert| Running GNU/Linux | Happy \ \dave @ treblig.org | | In Hex / \ _|_ http://www.treblig.org |___/
Bug#1029968: Acknowledgement (bttv/v4l: WARNING: CPU: 6 PID: 6164 at mm/vmalloc.c:487 __vmap_pages_range_noflush+0x3e0/0x4d0)
On Wednesday, 1 February 2023 02:52:13 CET Dr. David Alan Gilbert wrote: > bisected: > GOOD [37fcacb50be7071d146144a6c5c5bf0194b9a1cf] phy: PHY_FSL_LYNX_28G should > depend on ARCH_LAYERSCAPE BAD [f5ff79fddf0efecca538046b5cc20fb3ded2ec4f] > dma-mapping: remove CONFIG_DMA_REMAP GOOD > [e62c17f0455a74b182ce6373e2777817256afaa1] MAINTAINERS: update maintainer > list of DMA MAPPING BENCHMARK GOOD > [0fb3436b4b36cf69f4544385aa2bb8c5a4913509] sparc: Remove usage of the > deprecated "pci-dma-compat.h" API GOOD > [fba09099c6e506608e05e08ac717bf34501f821b] media: v4l2-pci-skeleton: Remove > usage of the deprecated "pci-dma-compat.h" API > > dg@major:~/kernel/kernel-clone$ git bisect good > f5ff79fddf0efecca538046b5cc20fb3ded2ec4f is the first bad commit > commit f5ff79fddf0efecca538046b5cc20fb3ded2ec4f > Author: Christoph Hellwig > Date: Sat Feb 26 16:40:21 2022 +0100 > > dma-mapping: remove CONFIG_DMA_REMAP > > That sounds like a believable cause given that it's IOMMU related > and device related. Thanks for that thorough analyses! If you're 'penguin42' on IRC, then I'd suggest to present your findings to io...@lists.linux.dev as both the author and the reviewer are highly likely subscribed to that list. scripts/get_maintainer.pl drivers/iommu/dma-iommu.c scripts/get_maintainer.pl kernel/dma/Makefile list them both and both results have also that ML in their result. HTH signature.asc Description: This is a digitally signed message part.
Bug#1029968: Info received (Bug#1029968: Acknowledgement (bttv/v4l: WARNING: CPU: 6 PID: 6164 at mm/vmalloc.c:487 __vmap_pages_range_noflush+0x3e0/0x4d0))
Note that the oops at this bisect point is messier than on the newer kernels; the newer kernels hit a WARN in __vmap_pages_range_noflush, where as at this point it slams into a BUG, but the rest of the backtrace is similar; [ 78.988024] BUG: unable to handle page fault for address: bd7fc110 [ 78.988033] #PF: supervisor write access in kernel mode [ 78.988036] #PF: error_code(0x000b) - reserved bit violation [ 78.988038] PGD 10067 P4D 10067 PUD 1001a6067 PMD 22b791067 PTE 8000270800cb9063 [ 78.988046] Oops: 000b [#1] PREEMPT SMP PTI [ 78.988050] CPU: 7 PID: 879 Comm: cat Tainted: G I 5.17.0-rc1dg+ #20 [ 78.988054] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./P55M Pro, BIOS P1.50 09/10/2009 [ 78.988056] RIP: 0010:__memset+0x24/0x30 [ 78.988063] Code: cc cc cc cc cc cc 0f 1f 44 00 00 49 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 [ 78.988067] RSP: 0018:bd7fc0cc7d50 EFLAGS: 00010206 [ 78.988071] RAX: RBX: 9679eb788a88 RCX: 2000 [ 78.988073] RDX: RSI: RDI: bd7fc110 [ 78.988076] RBP: 8000 R08: R09: bd7fc110 [ 78.988079] R10: 0001 R11: bd7fc110 R12: 0010 [ 78.988081] R13: 0010 R14: 9679ec8e4130 R15: 0010 [ 78.988084] FS: 7f91fb65a740() GS:9679efdc() knlGS: [ 78.988087] CS: 0010 DS: ES: CR0: 80050033 [ 78.988090] CR2: bd7fc110 CR3: 00022ce02000 CR4: 06e0 [ 78.988093] Call Trace: [ 78.988096] [ 78.988100] __videobuf_iolock+0x5cd/0x659 [videobuf_dma_sg] [ 78.988110] vbi_buffer_prepare+0x1aa/0x2b0 [bttv] [ 78.988125] __videobuf_read_start+0xb9/0x1d0 [videobuf_core] [ 78.988133] videobuf_read_stream+0x2cb/0x330 [videobuf_core] [ 78.988140] bttv_read+0xc5/0x1d0 [bttv] [ 78.988151] v4l2_read+0x6b/0x80 [videodev] [ 78.988169] vfs_read+0x97/0x190 [ 78.988175] ksys_read+0x63/0xe0 [ 78.988179] do_syscall_64+0x3a/0x80 [ 78.988185] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 78.988191] RIP: 0033:0x7f91fb7550ed [ 78.988194] Code: 31 c0 e9 c6 fe ff ff 50 48 8d 3d f6 54 0a 00 e8 39 fe 01 00 66 0f 1f 84 00 00 00 00 00 80 3d f1 24 0e 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec [ 78.988198] RSP: 002b:7ffdad058348 EFLAGS: 0246 ORIG_RAX: [ 78.988202] RAX: ffda RBX: 0002 RCX: 7f91fb7550ed [ 78.988204] RDX: 0002 RSI: 7f91fb35 RDI: 0003 [ 78.988207] RBP: 0002 R08: R09: [ 78.988209] R10: 7f91fb66cb40 R11: 0246 R12: 7f91fb35 [ 78.988212] R13: 0003 R14: 0002 R15: [ 78.988216] [ 78.988218] Modules linked in: rfkill qrtr tuner_simple tuner_types intel_powerclamp coretemp tuner snd_hda_codec_via tda7432 kvm_intel snd_hda_codec_generic snd_hda_codec_hdmi tvaudio ledtrig_audio msp3400 snd_hda_intel kvm snd_intel_dspcfg bttv snd_intel_sdw_acpi snd_hda_codec irqbypass tea575x snd_hda_core tveeprom videobuf_dma_sg intel_cstate videobuf_core videodev snd_hwdep snd_bt87x intel_uncore snd_pcm serio_raw pcspkr iTCO_wdt i7core_edac mc joydev intel_pmc_bxt snd_timer iTCO_vendor_support snd watchdog soundcore sg evdev acpi_cpufreq firewire_sbp2 fuse msr configfs efi_pstore ip_tables x_tables autofs4 ext4 crc32c_generic crc16 mbcache jbd2 nouveau sd_mod t10_pi crc_t10dif crct10dif_generic ata_generic crct10dif_common hid_generic usbhid hid mxm_wmi wmi video i2c_algo_bit drm_ttm_helper ttm drm_kms_helper cec rc_core drm ahci libahci pata_via libata ehci_pci ehci_hcd psmouse r8169 usbcore scsi_mod crc32c_intel realtek i2c_i801 mdio_devres i2c_smbus libphy firewire_ohci [ 78.988301] firewire_core lpc_ich usb_common scsi_common crc_itu_t button [ 78.988311] CR2: bd7fc110 [ 78.988314] ---[ end trace ]--- [ 78.988316] RIP: 0010:__memset+0x24/0x30 [ 78.988320] Code: cc cc cc cc cc cc 0f 1f 44 00 00 49 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 [ 78.988324] RSP: 0018:bd7fc0cc7d50 EFLAGS: 00010206 [ 78.988327] RAX: RBX: 9679eb788a88 RCX: 2000 [ 78.988329] RDX: RSI: RDI: bd7fc110 [ 78.988332] RBP: 8000 R08: R09: bd7fc110 [ 78.988334] R10: 0001 R11: bd7fc110 R12: 0010 [ 78.988337] R13: 0010 R14: 9679ec8e4130 R15: 0010 [ 78.988340] FS: 7f91fb65a740() GS:9679efdc00
Bug#1029968: Acknowledgement (bttv/v4l: WARNING: CPU: 6 PID: 6164 at mm/vmalloc.c:487 __vmap_pages_range_noflush+0x3e0/0x4d0)
bisected: GOOD [37fcacb50be7071d146144a6c5c5bf0194b9a1cf] phy: PHY_FSL_LYNX_28G should depend on ARCH_LAYERSCAPE BAD [f5ff79fddf0efecca538046b5cc20fb3ded2ec4f] dma-mapping: remove CONFIG_DMA_REMAP GOOD [e62c17f0455a74b182ce6373e2777817256afaa1] MAINTAINERS: update maintainer list of DMA MAPPING BENCHMARK GOOD [0fb3436b4b36cf69f4544385aa2bb8c5a4913509] sparc: Remove usage of the deprecated "pci-dma-compat.h" API GOOD [fba09099c6e506608e05e08ac717bf34501f821b] media: v4l2-pci-skeleton: Remove usage of the deprecated "pci-dma-compat.h" API dg@major:~/kernel/kernel-clone$ git bisect good f5ff79fddf0efecca538046b5cc20fb3ded2ec4f is the first bad commit commit f5ff79fddf0efecca538046b5cc20fb3ded2ec4f Author: Christoph Hellwig Date: Sat Feb 26 16:40:21 2022 +0100 dma-mapping: remove CONFIG_DMA_REMAP That sounds like a believable cause given that it's IOMMU related and device related. -- -Open up your eyes, open up your mind, open up your code --- / Dr. David Alan Gilbert| Running GNU/Linux | Happy \ \dave @ treblig.org | | In Hex / \ _|_ http://www.treblig.org |___/
Bug#1029968: Acknowledgement (bttv/v4l: WARNING: CPU: 6 PID: 6164 at mm/vmalloc.c:487 __vmap_pages_range_noflush+0x3e0/0x4d0)
Upstream 5.17 works Upstream 5.18 fails (with intel_iommu=on) Let the bisect begin. -- -Open up your eyes, open up your mind, open up your code --- / Dr. David Alan Gilbert| Running GNU/Linux | Happy \ \dave @ treblig.org | | In Hex / \ _|_ http://www.treblig.org |___/
Bug#1029968: Acknowledgement (bttv/v4l: WARNING: CPU: 6 PID: 6164 at mm/vmalloc.c:487 __vmap_pages_range_noflush+0x3e0/0x4d0)
This is IOMMU related. Upstream 6.1 and 5.18 *do* exhibit the bug, but only with intel_iommu=on where as Debian seems to default it to on. -- -Open up your eyes, open up your mind, open up your code --- / Dr. David Alan Gilbert| Running GNU/Linux | Happy \ \dave @ treblig.org | | In Hex / \ _|_ http://www.treblig.org |___/
Bug#1029968: Acknowledgement (bttv/v4l: WARNING: CPU: 6 PID: 6164 at mm/vmalloc.c:487 __vmap_pages_range_noflush+0x3e0/0x4d0)
I built upstream kernels 5.18.0 and 6.1.0 and both of them work for me. Which makes life much more painful to find. -- -Open up your eyes, open up your mind, open up your code --- / Dr. David Alan Gilbert| Running GNU/Linux | Happy \ \dave @ treblig.org | | In Hex / \ _|_ http://www.treblig.org |___/
Bug#1029968: Acknowledgement (bttv/v4l: WARNING: CPU: 6 PID: 6164 at mm/vmalloc.c:487 __vmap_pages_range_noflush+0x3e0/0x4d0)
WORKS https://snapshot.debian.org/archive/debian/20220601T031637Z/pool/main/l/linux-signed-amd64/linux-image-5.17.0-1-amd64_5.17.3-1_amd64.deb 5.17.0-1-amd64 #1 SMP PREEMPT Debian 5.17.3-1 So I think it's time to move upstream and bisect between 5.17 and 5.18 Dave -- -Open up your eyes, open up your mind, open up your code --- / Dr. David Alan Gilbert| Running GNU/Linux | Happy \ \dave @ treblig.org | | In Hex / \ _|_ http://www.treblig.org |___/
