Commit 872e9a20 authored Jun 01, 2020 by Wetp Zhang Committed by Linus Torvalds Jun 02, 2020

mm, memory_failure: don't send BUS_MCEERR_AO for action required error



Some processes dont't want to be killed early, but in "Action Required"
case, those also may be killed by BUS_MCEERR_AO when sharing memory with
other which is accessing the fail memory.  And sending SIGBUS with
BUS_MCEERR_AO for action required error is strange, so ignore the
non-current processes here.

Suggested-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Wetp Zhang <wetp.zy@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Acked-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Link: http://lkml.kernel.org/r/1590817116-21281-1-git-send-email-wetp.zy@linux.alibaba.com


Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 6972f55c

mm/memory-failure.c

+9 −6

Original line number	Diff line number	Diff line
		@@ -210,14 +210,17 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags)
		{
		struct task_struct *t = tk->tsk;
		short addr_lsb = tk->size_shift;
		int ret;
		int ret = 0;

		if ((t->mm == current->mm) \|\| !(flags & MF_ACTION_REQUIRED))
		pr_err("Memory failure: %#lx: Sending SIGBUS to %s:%d due to hardware memory corruption\n",
		pfn, t->comm, t->pid);

		if ((flags & MF_ACTION_REQUIRED) && t->mm == current->mm) {
		ret = force_sig_mceerr(BUS_MCEERR_AR, (void __user *)tk->addr,
		addr_lsb);
		if (flags & MF_ACTION_REQUIRED) {
		if (t->mm == current->mm)
		ret = force_sig_mceerr(BUS_MCEERR_AR,
		(void __user *)tk->addr, addr_lsb);
		/* send no signal to non-current processes */
		} else {
		/*
		* Don't use force here, it's convenient if the signal

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