linux-kernel - [rht_deferred_worker] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 33s!

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Date:   Tue, 7 Nov 2017 18:30:19 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     netdev@...r.kernel.org
Cc:     Thomas Graf <tgraf@...g.ch>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>, linux-kernel@...r.kernel.org
Subject: [rht_deferred_worker] BUG: workqueue lockup - pool cpus=0 node=0
 flags=0x0 nice=0 stuck for 33s!

FYI another workqueue lockup on rhashtable testing.

[  330.583179]   Deleting 50000 keys
[  339.302251]   Duration of test: 26623682510 ns
[  339.310019] Average test time: 21144321486
[  339.311680] Testing concurrent rhashtable access from 10 threads
[  367.586868] Writes:  Total: 2  Max/Min: 0/0   Fail: 0 
[  406.501055] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 33s!
[  406.503708] Showing busy workqueues and worker pools:
[  406.510695] workqueue events: flags=0x0
[  406.517288]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=3/256
[  406.519526]     in-flight: 3:rht_deferred_worker
[  406.520454]     pending: vmstat_shepherd, rht_deferred_worker

Attached the full dmesg and kconfig.

Thanks,
Fengguang

View attachment "dmesg-vm-lkp-os-openwrt-ia32-11:20171107073158:x86_64-randconfig-ws0-11070630:4.14.0-rc8:88" of type "text/plain" (26943 bytes)

View attachment ".config" of type "text/plain" (87115 bytes)