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fs/proc: fix softlockup in __read_vmcore

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While taking a kernel core dump with makedumpfile on a larger system,
softlockup messages often appear.

While softlockup warnings can be harmless, they can also interfere with
things like RCU freeing memory, which can be problematic when the kdump
kexec image is configured with as little memory as possible.

Avoid the softlockup, and give things like work items and RCU a chance to
do their thing during __read_vmcore by adding a cond_resched.

Link: https://lkml.kernel.org/r/20240507091858.36ff767f@imladris.surriel.com
Signed-off-by: Rik van Riel <riel@surriel.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Rik van Riel 2024-05-07 09:18:58 -04:00 committed by Andrew Morton
parent 0a73eac1ed
commit 5cbcb62ddd
1 changed files with 2 additions and 0 deletions
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fs/proc/vmcore.c
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@ -383,6 +383,8 @@ static ssize_t __read_vmcore(struct iov_iter *iter, loff_t *fpos)
/* leave now if filled buffer already */
if (!iov_iter_count(iter))
return acc;
cond_resched();
}
list_for_each_entry(m, &vmcore_list, list) {