[PATCH 0/1] s390: fix endless loop in do_signal

[Sumanth Korikkar <sumanthk@linux.ibm.com>]

Hi,

This patch fixes the issue for s390  stable kernel starting  5.10.162.
The issue was specifically seen after stable version 5.10.162:
Following commits can trigger it:
1. stable commit id - 788d0824269b ("io_uring: import 5.15-stable
io_uring") can trigger this problem.
2. upstream commit id - 75309018a24d ("s390: add support for
TIF_NOTIFY_SIGNAL")

Problem:
qemu and user processes could stall when TIF_NOTIFY_SIGNAL is set from
io_uring work.

Affected users:
The issue was first raised by the debian team, where the s390
bullseye build systems are affected.

Upstream commit Id:
* The attached patch has no upstream commit. However, the stable kernel
5.10.162+ uses upstream commit id - 75309018a24d ("s390: add support for
TIF_NOTIFY_SIGNAL"), which would need this fix
* Starting from v5.12, there are s390 generic entry commits 
56e62a737028 ("s390: convert to generic entry")  and its relevant fixes,
which are recommended and should address these problems.

Kernel version to be applied:
stable kernel 5.10.162+

Thanks.
Sumanth

Sumanth Korikkar (1):
  s390/signal: fix endless loop in do_signal

 arch/s390/kernel/signal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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2.37.2