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Subject[] soft lockup when removing netconsole module

When trying to remove the netconsole module, I got the following kernel
output after a while (couple of minutes iirc):

[525720.117293] BUG: soft lockup detected on CPU#1!
[525720.117353] [<c1004d53>] show_trace_log_lvl+0x1a/0x30
[525720.117439] [<c1004d7b>] show_trace+0x12/0x14
[525720.117526] [<c1004e75>] dump_stack+0x16/0x18
[525720.117613] [<c104dd5b>] softlockup_tick+0xa6/0xc2
[525720.117694] [<c1026855>] run_local_timers+0x12/0x14
[525720.117738] [<c1026669>] update_process_times+0x72/0xa1
[525720.117744] [<c1038673>] tick_sched_timer+0x53/0xb6
[525720.117748] [<c1033d62>] hrtimer_interrupt+0x189/0x1e3
[525720.117753] [<c100e9e2>] local_apic_timer_interrupt+0x55/0x5b
[525720.117761] [<c100ea12>] smp_apic_timer_interrupt+0x2a/0x39
[525720.117766] [<c1004a3f>] apic_timer_interrupt+0x33/0x38
[525720.117770] [<c120f4b1>] mutex_lock+0x8/0xa
[525720.117775] [<c102d2f0>] flush_workqueue+0x2f/0x8f
[525720.117780] [<c102d7a0>] cancel_rearming_delayed_workqueue+0x29/0x2b
[525720.117785] [<c102d7b1>] cancel_rearming_delayed_work+0xf/0x11
[525720.117790] [<c11be143>] netpoll_cleanup+0x75/0xa5
[525720.117794] [<f893712d>] cleanup_netconsole+0x17/0x1a [netconsole]
[525720.117804] [<c1041f11>] sys_delete_module+0x12f/0x14f
[525720.117809] [<c1003f74>] syscall_call+0x7/0xb
[525720.117812] =======================

Also the rmmod hangs and would not exit even with kill -9. It also
sucks up 100% cpu.

Folkert van Heusden

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