Hi all,
Issue is fixed in Ubuntu 24.04.1 - I am closing this ticket.
** Changed in: linux (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/2079038
Title:
[VROC] [Ub 24.04.0/1] Kernel bug and reboot hang during recovery -
missing patch
Status in linux package in Ubuntu:
Fix Released
Bug description:
Steps to reproduce:
1. Create RAID array (example for IMSM):
mdadm -CR imsm -e imsm -n2 /dev/nvme[01]n1
mdadm -CR vol1 -l1 -n2 /dev/nvme[01]n1
2. Hot-remove one of the drive.
3. Insert drive back - recovery should start.
4. Reboot platform
Expected: reboot is performed successfully. Recovery is continued.
Actual: reboot hanged and call trace appeared.
[ 776.416504] (sd-umoun[3359]: Failed to unmount
/run/shutdown/mounts/bd36b757b23bbc6f: Device or resource busy
[ 776.445568] shutdown[1]: Could not stop MD /dev/md126: Device or
resource busy
mdadm: Cannot get exclusive access to /dev/md126:Perhaps a running
process, mounted filesystem or active volume group?
mdadm: Cannot stop container /dev/md127: member md126 still active
mdadm: Cannot get exclusive access to /dev/md126:Perhaps a running
process, mounted filesystem or active volume group?
mdadm: Cannot st[ 784.636276] (sd-exec-[3360]:
/usr/lib/systemd/system-shutdown/mdadm.finalrd failed with exit status
1.
op container /dev/md127: member [ 784.647309] shutdown[1]: Unable to
finalize remaining file systems, MD devices, ignoring.
md126 still active
[ 986.549746] INFO: task shutdown:1 blocked for more than 122
seconds.
[ 986.556158] Not tainted 6.8.0-31-generic #31-Ubuntu
[ 986.561586] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 986.569440] task:shutdown state:D stack:0 pid:1
tgid:1 ppid:0 flags:0x00004002
[ 986.578769] Call Trace:
[ 986.581236] <TASK>
[ 986.583352] __schedule+0x27c/0x6b0
[ 986.586864] schedule+0x33/0x110
[ 986.590111] stop_sync_thread+0x135/0x1b0
[ 986.594143] ? __pfx_autoremove_wake_function+0x10/0x10
[ 986.599388] __md_stop_writes+0x19/0xf0
[ 986.603240] md_notify_reboot+0x93/0x160
[ 986.607186] notifier_call_chain+0x5e/0xe0
[ 986.611301] blocking_notifier_call_chain+0x41/0x70
[ 986.616201] kernel_restart+0x21/0xa0
[ 986.619881] __do_sys_reboot+0x156/0x250
[ 986.623824] __x64_sys_reboot+0x1b/0x30
[ 986.627680] x64_sys_call+0x223c/0x25c0
[ 986.631535] do_syscall_64+0x7f/0x180
[ 986.635218] ? irqentry_exit+0x43/0x50
[ 986.638990] ? exc_page_fault+0x94/0x1b0
[ 986.642932] entry_SYSCALL_64_after_hwframe+0x73/0x7b
[ 986.648003] RIP: 0033:0x7da6531dea07
[ 986.651623] RSP: 002b:00007fff2babce18 EFLAGS: 00000246 ORIG_RAX:
00000000000000a9
[ 986.659211] RAX: ffffffffffffffda RBX: 0000000000000003 RCX:
00007da6531dea07
[ 986.666362] RDX: 0000000001234567 RSI: 0000000028121969 RDI:
00000000fee1dead
[ 986.673509] RBP: 00007fff2babd050 R08: 0000000000000069 R09:
0000000000000000
[ 986.680662] R10: 0000000000000000 R11: 0000000000000246 R12:
0000000000000001
[ 986.687808] R13: 0000000000000000 R14: 0000000000000000 R15:
0000000001234567
[ 986.694956] </TASK>
[ 986.697665] Kernel panic - not syncing: hung_task: blocked tasks
[ 986.703732] CPU: 0 PID: 982 Comm: khungtaskd Not tainted
6.8.0-31-generic #31-Ubuntu
[ 986.711510] Hardware name: Intel Corporation WilsonCity/WilsonCity,
BIOS WLYDCRB1.SYS.0020.P84.2103030140 03/03/2021
[ 986.722061] Call Trace:
[ 986.724529] <TASK>
[ 986.726639] dump_stack_lvl+0x48/0x70
[ 986.730326] dump_stack+0x10/0x20
[ 986.733661] panic+0x35f/0x3c0
[ 986.736738] check_hung_uninterruptible_tasks+0x279/0x320
[ 986.742157] ? __pfx_watchdog+0x10/0x10
[ 986.746011] watchdog+0xad/0xb0
[ 986.749164] kthread+0xef/0x120
[ 986.752317] ? __pfx_kthread+0x10/0x10
[ 986.756080] ret_from_fork+0x44/0x70
[ 986.760081] ? __pfx_kthread+0x10/0x10
[ 986.764201] ret_from_fork_asm+0x1b/0x30
[ 986.768473] </TASK>
[ 986.771197] Kernel Offset: 0x1c00000 from 0xffffffff81000000
(relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 986.913304] ---[ end Kernel panic - not syncing: hung_task: blocked
tasks ]---
This issue is fixed in md. Please apply patch:
https://github.com/torvalds/linux/commit/1ddeeb2a058d7b2a58ed9e820396b4ceb715d529
But customer also see other issue and reboot is delayed with this
patch (not hanged). I cannot reproduce it on my platform, but I know
that newer kernel (6.11-rc4) fixes his all issues.
If possible rebase to the 6.11-rc4
(https://kernel.ubuntu.com/mainline/v6.11-rc4/ )
because there all of the customers issues are fixed.
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