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fs/proc: fix softlockup in __read_vmcore

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commit 5cbcb62dddf5346077feb82b7b0c9254222d3445 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 7bdf1d550ddfcd9ab797087421f77b7aceddc8a7)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
This commit is contained in:
Rik van Riel 2024-05-07 09:18:58 -04:00 committed by Vegard Nossum
parent 37026b40b5
commit aaea44b590
1 changed files with 2 additions and 0 deletions
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2
fs/proc/vmcore.c
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@ -242,6 +242,8 @@ static ssize_t __read_vmcore(char *buffer, size_t buflen, loff_t *fpos,
/* leave now if filled buffer already */
if (buflen == 0)
return acc;
cond_resched();
}
list_for_each_entry(m, &vmcore_list, list) {