[Kernel-packages] [Bug 1875941] Re: using perf can crash kernel with a stack overflow
*** This bug is a duplicate of bug 1878649 *** https://bugs.launchpad.net/bugs/1878649 Fixed as part of the SRU process: https://bugs.launchpad.net/bugs/1878649 https://kernel.ubuntu.com/git/ubuntu/ubuntu-focal.git/commit/?h=master- next=7e02b9b6cb0f61440598c06572172241de4ed9ea ** Changed in: linux (Ubuntu Focal) Status: New => Fix Committed ** This bug has been marked a duplicate of bug 1878649 Focal update: v5.4.41 upstream stable release -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf can crash kernel with a stack overflow Status in Linux: Confirmed Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: Fix Committed Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] Re: using perf can crash kernel with a stack overflow
Fixed in upstream commit: commit 11f5efc3ab66284f7aaacc926e9351d658e2577b Author: Steven Rostedt (VMware) Date: Wed May 6 10:36:18 2020 -0400 tracing: Add a vmalloc_sync_mappings() for safe measure -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf can crash kernel with a stack overflow Status in Linux: Confirmed Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941]
Please have a look here: https://lore.kernel.org/lkml/20200430141120.ga8...@suse.de/ and https://lore.kernel.org/lkml/20200430145057.gb8...@suse.de/ This is likely the same issue. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf can crash kernel with a stack overflow Status in Linux: Confirmed Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941]
Yep, it definitely is the same issue. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf can crash kernel with a stack overflow Status in Linux: Confirmed Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] Re: using perf can crash kernel with a stack overflow
https://lore.kernel.org/lkml/20200430145057.gb8...@suse.de/ -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf can crash kernel with a stack overflow Status in Linux: Confirmed Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] Re: using perf can crash kernel with a stack overflow
Launchpad has imported 4 comments from the remote bug at https://bugzilla.kernel.org/show_bug.cgi?id=207519. If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. On 2020-04-30T11:00:39+00:00 colin.king wrote: originally I triggered this with stress-ng on V0.11.08 running sudo stress-ng --perf --cpu 1 -t 10 I've pushed a commit since to not use the TLB flush event to avoid this issue for the moment. I've worked through all the perf event combinations and found that the kernel panic occurs with the following events: sudo perf record -eexceptions:page_fault_user,exceptions:page_fault_kernel,tlb:tlb_flush sleep 1 Bisecting the kernel I found that this issue occurred when the following commit landed in the kernel: commit 763802b53a427ed3cbd419dbba255c414fdd9e7c Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() This is a 100% reproducer, always happes on x86-64 in VM and on hardware. Reply at: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/comments/6 On 2020-04-30T11:20:20+00:00 colin.king wrote: Created attachment 288837 full stack dump Top of stack dump (attached) shows it's a stack overflow [ 22.163398] BUG: stack guard page was hit at (ptrval) (stack is (ptrval)..(ptrval)) [ 22.165204] kernel stack overflow (double-fault): [#1] SMP PTI [ 22.166729] CPU: 3 PID: 935 Comm: perf Not tainted 5.4.0-28-generic #32-Ubuntu [ 22.168813] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1 04/01/2014 [ 22.171263] RIP: 0010:perf_trace_x86_exceptions+0x44/0xf0 [ 22.172769] Code: 83 ec 18 48 8b 5f 78 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 65 48 03 1d 00 0c f9 68 48 8b 87 80 00 00 00 48 85 c0 75 08 <48> 8b 03 48 85 c0 74 74 bf 24 00 00 00 48 8d 55 c4 48 8d 75 c8 e8 [ 22.176573] RSP: 0018:978f00838020 EFLAGS: 00010046 [ 22.177569] RAX: RBX: b78effdcab70 RCX: [ 22.178800] RDX: 978f008380b8 RSI: b78effdcab70 RDI: 9863e620 [ 22.179993] RBP: 978f00838060 R08: R09: [ 22.181188] R10: R11: R12: 9863e620 [ 22.182698] R13: R14: b78effdcab70 R15: 978f008380b8 [ 22.184019] FS: 7ff4818af780() GS:892b7db8() knlGS: [ 22.185592] CS: 0010 DS: ES: CR0: 80050033 [ 22.186732] CR2: 978f00837ff8 CR3: 7d5d8000 CR4: 06e0 [ 22.188100] Call Trace: [ 22.188689] do_page_fault+0xca/0xe0 [ 22.189493] do_async_page_fault+0x39/0x70 [ 22.190388] async_page_fault+0x34/0x40 [ 22.191233] RIP: 0010:perf_trace_x86_exceptions+0x44/0xf0 Reply at: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/comments/7 On 2020-04-30T11:41:52+00:00 colin.king wrote: Finally got a full stack dump: Reply at: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/comments/9 On 2020-04-30T11:42:23+00:00 colin.king wrote: still occurs on 5.7-rc2 and today's linux-next tip Reply at: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/comments/10 ** Changed in: linux Status: Unknown => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf can crash kernel with a stack overflow Status in Linux: Confirmed Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] Re: using perf as root locks up focal kernel
** Changed in: linux (Ubuntu) Importance: Critical => High ** Summary changed: - using perf as root locks up focal kernel + using perf can crash kernel with a stack overflow -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf can crash kernel with a stack overflow Status in Linux: Unknown Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] Re: using perf as root locks up focal kernel
Appears to be a stack overflow: Top of stack dump (attached) shows it's a stack overflow [ 22.163398] BUG: stack guard page was hit at (ptrval) (stack is (ptrval)..(ptrval)) [ 22.165204] kernel stack overflow (double-fault): [#1] SMP PTI [ 22.166729] CPU: 3 PID: 935 Comm: perf Not tainted 5.4.0-28-generic #32-Ubuntu [ 22.168813] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1 04/01/2014 [ 22.171263] RIP: 0010:perf_trace_x86_exceptions+0x44/0xf0 [ 22.172769] Code: 83 ec 18 48 8b 5f 78 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 65 48 03 1d 00 0c f9 68 48 8b 87 80 00 00 00 48 85 c0 75 08 <48> 8b 03 48 85 c0 74 74 bf 24 00 00 00 48 8d 55 c4 48 8d 75 c8 e8 [ 22.176573] RSP: 0018:978f00838020 EFLAGS: 00010046 [ 22.177569] RAX: RBX: b78effdcab70 RCX: [ 22.178800] RDX: 978f008380b8 RSI: b78effdcab70 RDI: 9863e620 [ 22.179993] RBP: 978f00838060 R08: R09: [ 22.181188] R10: R11: R12: 9863e620 [ 22.182698] R13: R14: b78effdcab70 R15: 978f008380b8 [ 22.184019] FS: 7ff4818af780() GS:892b7db8() knlGS: [ 22.185592] CS: 0010 DS: ES: CR0: 80050033 [ 22.186732] CR2: 978f00837ff8 CR3: 7d5d8000 CR4: 06e0 [ 22.188100] Call Trace: [ 22.188689] do_page_fault+0xca/0xe0 [ 22.189493] do_async_page_fault+0x39/0x70 [ 22.190388] async_page_fault+0x34/0x40 [ 22.191233] RIP: 0010:perf_trace_x86_exceptions+0x44/0xf0 ** Attachment added: "full stack dump" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/+attachment/5363960/+files/stackdump.txt -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf as root locks up focal kernel Status in Linux: Unknown Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] Re: using perf as root locks up focal kernel
** Bug watch added: Linux Kernel Bug Tracker #207519 https://bugzilla.kernel.org/show_bug.cgi?id=207519 ** Also affects: linux via https://bugzilla.kernel.org/show_bug.cgi?id=207519 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf as root locks up focal kernel Status in Linux: Unknown Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] Re: using perf as root locks up focal kernel
OK, this seems to only happen when using exceptions/page_fault_user, exceptions/page_fault_kernel and tlb/tlb_flush together. One can reproduce this with perf: sudo perf record -e exceptions:page_fault_user,exceptions:page_fault_kernel,tlb:tlb_flush sleep 1 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf as root locks up focal kernel Status in Linux: Unknown Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] Re: using perf as root locks up focal kernel
Attaching strace, managed to capture this crash report before a the hang. ** Attachment added: "image" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/+attachment/5363910/+files/Screenshot%20from%202020-04-30%2009-25-01.png -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf as root locks up focal kernel Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] Re: using perf as root locks up focal kernel
The TLB tlb/tlb_flush perf event tickles this bug, disabling it won't trip the issue. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf as root locks up focal kernel Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] Re: using perf as root locks up focal kernel
Tried this on 5.5.19, 5.6.7 and 5.7-rc3 and it's still an issue. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf as root locks up focal kernel Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] Re: using perf as root locks up focal kernel
This commit is revertable against the current focal head and resolves this issue. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf as root locks up focal kernel Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1875941] [NEW] using perf as root locks up focal kernel
Public bug reported: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. ** Affects: linux (Ubuntu) Importance: Critical Assignee: Colin Ian King (colin-king) Status: In Progress ** Affects: linux (Ubuntu Focal) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Focal) Importance: Undecided Status: New ** Changed in: linux (Ubuntu) Status: New => Triaged ** Changed in: linux (Ubuntu) Importance: Undecided => Critical ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Colin Ian King (colin-king) ** Changed in: linux (Ubuntu) Status: Triaged => In Progress -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf as root locks up focal kernel Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
