Re: Soft lockup issue in Linux 4.1.9

From: Andre Tomt
Date: Thu Oct 01 2015 - 00:41:53 EST


On 01. okt. 2015 00:37, Holger HoffstÃtte wrote:
On Wed, 30 Sep 2015 23:59:43 +0200, Olivier Bonvalet wrote:

for information, I've just upgraded 6 servers from Linux 4.1.8 to Linux
4.1.9, and have some random soft lockup. If this can help :

Congratulations! You're not the first one to get hit by this, but
you are probably the first one to get a meaningful stacktrace! \o/

[ 204.478380] Call Trace:
[ 204.478381] <IRQ>
[ 204.478385] [<ffffffff81076121>] ? try_to_del_timer_sync+0x43/0x4d
[ 204.478386] [<ffffffff810760de>] ? del_timer+0x4d/0x4d
[ 204.478388] [<ffffffff8107614b>] ? del_timer_sync+0x20/0x3d

Can you try to revert

[PATCH 4.1 157/159] inet: fix races with reqsk timers

and see how that works for you? I'll do the same on my end. So far the
only thing I ever could gleam was an rcu stall after cpuidle_enter(),
but never anything regarding the timer - though it was definitely
related to NIC activity after idle.

I'm running with this patch reverted now as well. 2 hours no issues so far, but I can't conclude anything yet as I've seen it take up to 6+ hours to explode here. As a result the bisect was going veeery slowly.
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