The quilt patch titled Subject: fs/proc: fix softlockup in __read_vmcore has been removed from the -mm tree. Its filename was fs-proc-fix-softlockup-in-__read_vmcore.patch
This patch was dropped because it was merged into the mm-nonmm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------ From: Rik van Riel riel@surriel.com Subject: fs/proc: fix softlockup in __read_vmcore Date: Tue, 7 May 2024 09:18:58 -0400
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 ---
fs/proc/vmcore.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/fs/proc/vmcore.c~fs-proc-fix-softlockup-in-__read_vmcore +++ a/fs/proc/vmcore.c @@ -383,6 +383,8 @@ static ssize_t __read_vmcore(struct iov_ /* leave now if filled buffer already */ if (!iov_iter_count(iter)) return acc; + + cond_resched(); }
list_for_each_entry(m, &vmcore_list, list) { _
Patches currently in -mm which might be from riel@surriel.com are