When doing cpu hotplug in a KVM guest with virtio blk I get warnings like
747.652408] ------------[ cut here ]------------
[ 747.652410] WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144
__blk_mq_run_hw_queue+0xd4/0x100
[ 747.652410] Modules linked in: dm_multipath
[ 747.652412] CPU: 4 PID: 2895 Comm: kworker/4:1H Tainted: G W
4.14.0+ #191
[ 747.652412] Hardware name: IBM 2964 NC9 704 (KVM/Linux)
[ 747.652414] Workqueue: kblockd blk_mq_run_work_fn
[ 747.652414] task: 0000000060680000 task.stack: 000000005ea30000
[ 747.652415] Krnl PSW : 0704f00180000000 0000000000505864
(__blk_mq_run_hw_queue+0xd4/0x100)
[ 747.652417] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:3 PM:0
RI:0 EA:3
[ 747.652417] Krnl GPRS: 0000000000000010 00000000000000ff 000000005cbec400
0000000000000000
[ 747.652418] 0000000063709120 0000000000000000 0000000063709500
0000000059fa44b0
[ 747.652418] 0000000059fa4480 0000000000000000 000000006370f700
0000000063709100
[ 747.652419] 000000005cbec500 0000000000970948 000000005ea33d80
000000005ea33d48
[ 747.652423] Krnl Code: 0000000000505854: ebaff0a00004 lmg
%r10,%r15,160(%r15)
000000000050585a: c0f4ffe690d3 brcl 15,1d7a00
#0000000000505860: a7f40001 brc 15,505862
>0000000000505864: 581003b0 l %r1,944
0000000000505868: c01b001fff00 nilf %r1,2096896
000000000050586e: a784ffdb brc 8,505824
0000000000505872: a7f40001 brc 15,505874
0000000000505876: 9120218f tm 399(%r2),32
[ 747.652435] Call Trace:
[ 747.652435] ([<0000000063709600>] 0x63709600)
[ 747.652436] [<0000000000187bcc>] process_one_work+0x264/0x4b8
[ 747.652438] [<0000000000187e78>] worker_thread+0x58/0x4f8
[ 747.652439] [<000000000018ee94>] kthread+0x144/0x168
[ 747.652439] [<00000000008f8a62>] kernel_thread_starter+0x6/0xc
[ 747.652440] [<00000000008f8a5c>] kernel_thread_starter+0x0/0xc
[ 747.652440] Last Breaking-Event-Address:
[ 747.652441] [<0000000000505860>] __blk_mq_run_hw_queue+0xd0/0x100
[ 747.652442] ---[ end trace 4a001a80379b18ba ]---
[ 747.652450] ------------[ cut here ]------------
This is
b7a71e66d (Jens Axboe 2017-08-01 09:28:24 -0600 1141) * are
mapped to it.
b7a71e66d (Jens Axboe 2017-08-01 09:28:24 -0600 1142) */
6a83e74d2 (Bart Van Assche 2016-11-02 10:09:51 -0600 1143)
WARN_ON(!cpumask_test_cpu(raw_smp_processor_id(), hctx->cpumask) &&
6a83e74d2 (Bart Van Assche 2016-11-02 10:09:51 -0600 1144)
cpu_online(hctx->next_cpu));
6a83e74d2 (Bart Van Assche 2016-11-02 10:09:51 -0600 1145)
b7a71e66d (Jens Axboe 2017-08-01 09:28:24 -0600 1146) /*
Is this a known issue?
Christian
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