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

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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>
This commit is contained in:
Wetp Zhang 2020-06-01 21:50:11 -07:00 committed by Linus Torvalds
parent 6972f55c41
commit 872e9a205c
1 changed files with 9 additions and 6 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
mm/memory-failure.c
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@ -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;
pr_err("Memory failure: %#lx: Sending SIGBUS to %s:%d due to hardware memory corruption\n",
pfn, t->comm, t->pid);
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