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| author | Pavel Begunkov <asml.silence@gmail.com> | 2020-08-25 01:42:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-27 10:31:49 +0300 |
| commit | 44f639d5aeda30318fc86aec2fe99581fc24a134 (patch) | |
| tree | bb6eb2f617f8917c73bd38a952ad89289d480a40 /lib/test_overflow.c | |
| parent | 3f4be7a7db9fa51929ea22f0cdcfa0abdbf1573f (diff) | |
| download | linux-44f639d5aeda30318fc86aec2fe99581fc24a134.tar.xz | |
io_uring: fix missing ->mm on exit
Upstream commits:
8eb06d7e8dd85 ("io_uring: fix missing ->mm on exit")
cbcf72148da4a ("io_uring: return locked and pinned page accounting")
do_exit() first drops current->mm and then runs task_work, from where
io_sq_thread_acquire_mm() would try to set mm for a user dying process.
[ 208.004249] WARNING: CPU: 2 PID: 1854 at
kernel/kthread.c:1238 kthread_use_mm+0x244/0x270
[ 208.004287] kthread_use_mm+0x244/0x270
[ 208.004288] io_sq_thread_acquire_mm.part.0+0x54/0x80
[ 208.004290] io_async_task_func+0x258/0x2ac
[ 208.004291] task_work_run+0xc8/0x210
[ 208.004294] do_exit+0x1b8/0x430
[ 208.004295] do_group_exit+0x44/0xac
[ 208.004296] get_signal+0x164/0x69c
[ 208.004298] do_signal+0x94/0x1d0
[ 208.004299] do_notify_resume+0x18c/0x340
[ 208.004300] work_pending+0x8/0x3d4
Reported-by: Roman Gershman <romange@gmail.com>
Tested-by: Roman Gershman <romange@gmail.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/test_overflow.c')
0 files changed, 0 insertions, 0 deletions