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SubjectRe: BUG: workqueue lockup (after powerdown)
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On 03.07.2017 09:34, Meelis Roos wrote:
> Today I tested 4.12 release on my RP3440 (HP parisc). It worked fine,
> then on shutdown I got this strange message from kernel after shutdown:
>
> reboot: Power down
> System shut down completed.
> Please power this system off now.
> BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 40s!
>
> and this continues with longer and longer times.
>
> Is it something hppa specific or general?

No idea.
Maybe other platforms (like x86_64) physically drop power on machine
so you won't see it. On parisc we can't power off on many machines,
so instead we will keep running in an endless for-next loop.

Btw, I'm seeing a similar BUG:

[ 308.432664] reboot: Power down
[ 308.479625] System shut down completed.
[ 308.479625] Please power this system off now.
[ 332.523916] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [halt:1807]
[ 332.523916] Modules linked in:
[ 332.523916] CPU: 0 PID: 1807 Comm: halt Not tainted 4.12.0-64bit+ #724
[ 332.523916] task: 00000000af379e00 task.stack: 00000000af00c000
[ 332.523916]
[ 332.523916] IASQ: 0000000000000000 0000000000000000 IAOQ: 000000004022d180 000000004022d17c
[ 332.523916] IIR: 08030241 ISR: 0000000000000000 IOR: 0000000000000000
[ 332.523916] CPU: 0 CR30: 00000000af00c000 CR31: 00000000d23345e2
[ 332.523916] ORIG_R28: 0000000000000000
[ 332.523916] IAOQ[0]: machine_restart+0x0/0xa0
[ 332.523916] IAOQ[1]: machine_power_off+0x104/0x108
[ 332.523916] RP(r2): machine_power_off+0x104/0x108
[ 332.523916] Backtrace:
[ 332.523916] [<000000004022d17c>] machine_power_off+0x104/0x108
[ 332.523916] [<000000004028ff3c>] kernel_power_off+0x1ac/0x1c0
[ 332.523916] [<00000000402902a8>] SyS_reboot+0x250/0x340
[ 332.523916] [<0000000040209020>] syscall_exit+0x0/0x14

Helge

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