Hi Mike,
I haven't tested the patch with wireshark until now. My system also
hangs shortly after it starts. I'm pretty sure I hit workqueues in my
earlier tests via the block driver, but it's clearly not whatever
wireshark is using. I'll look at it and try to post a fix. CCing the
list to avoid this patch until then.
Thanks,
Haris
On 04/09/2018 11:02 PM, Mike Galbraith wrote:
Hi,
Are these patches dead, or are you planning another submission? I ask
because I discovered that with them applied, firing up wireshark hangs
the box 100% repeatably, with wireshark never fully initializing.
Applying them to an otherwise virgin 4.14.20-rt17 to be sure...
crash> bt 6016PID: 6016 TASK: ffff95dd68572180 CPU: 2 COMMAND:
"dumpcap"
#0 [ffffb490094f3bc0] __schedule at ffffffffa56d55b9
#1 [ffffb490094f3c40] schedule at ffffffffa56d5a03
#2 [ffffb490094f3c58] schedule_timeout at ffffffffa56d8467
#3 [ffffb490094f3cd8] wait_for_completion at ffffffffa56d6e34
#4 [ffffb490094f3d18] __wait_rcu_gp at ffffffffa50e59cd
#5 [ffffb490094f3d58] synchronize_rcu at ffffffffa50ec14e
#6 [ffffb490094f3d98] packet_set_ring at ffffffffc0c74da0 [af_packet]
#7 [ffffb490094f3e50] packet_setsockopt at ffffffffc0c75d23 [af_packet]
#8 [ffffb490094f3ef8] sys_setsockopt at ffffffffa558a5e2
#9 [ffffb490094f3f30] do_syscall_64 at ffffffffa5001b05
#10 [ffffb490094f3f50] entry_SYSCALL_64_after_hwframe at ffffffffa5800065
RIP: 00007f3107a1cfaa RSP: 00007ffc9745c2e8 RFLAGS: 00000246
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f3107a1cfaa
RDX: 0000000000000005 RSI: 0000000000000107 RDI: 0000000000000003
RBP: 000055ae1d8eb470 R8: 000000000000001c R9: 0000000000000002
R10: 00007ffc9745c350 R11: 0000000000000246 R12: 00007ffc9745c350
R13: 0000000000000000 R14: 000055ae1d8eb200 R15: 000055ae1d8eb2d0
ORIG_RAX: 0000000000000036 CS: 0033 SS: 002b
crash> dmesg
...
[ 483.808197] BUG: workqueue lockup - pool cpus=2 node=0 flags=0x0 nice=0 stuck for 52s!
[ 483.808204] Showing busy workqueues and worker pools:
[ 483.808206] workqueue events: flags=0x0
[ 483.808208] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 483.808211] pending: check_corruption
[ 492.695124] sysrq: SysRq : Trigger a crash
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