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kern/55681: Kernel can panic on shutdown if accounting is enabled due to deadfs call
>Synopsis: Kernel can panic on shutdown if accounting is enabled due to deadfs call
>Arrival-Date: Wed Sep 23 17:15:01 +0000 2020
>Originator: Jason Thorpe
>Release: NetBSD 9.99.72
NetBSD 9.99.72 (multiprocessor Alpha, in this case, but this is a MI issue)
The kernel can panic due to a deadfs call during halt or reboot if accounting was enabled and not disabled before the reboot() system call.
[ 68841.1748690] syncing disks... done
[ 68842.3274481] unmounting file systems...
[ 68858.3562613] Skipping crash dump on recursive panic
[ 68858.4129006] panic: dead fs operation used
[ 68858.4627047] cpu1: Begin traceback...
[ 68858.5076248] alpha trace requires known PC =eject=
[ 68858.5662176] cpu1: End traceback...
Stopped in pid 0.762 (system) at netbsd:cpu_Debugger+0x4: ret
cpu_Debugger() at netbsd:cpu_Debugger+0x4
db_panic() at netbsd:db_panic+0xc8
vpanic() at netbsd:vpanic+0x10c
panic() at netbsd:panic+0x58
dead_panic() at netbsd:dead_panic+0x20
VFS_STATVFS() at netbsd:VFS_STATVFS+0x34
acct_chkfree() at netbsd:acct_chkfree+0x4c
acctwatch() at netbsd:acctwatch+0xb0
--- kernel thread backstop ---
Enable accounting, and use "halt" or "reboot" to shut down. Issue is not 100% reproducible, but will happen eventually.
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