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| author |   Pavel Begunkov <asml.silence@gmail.com> | 2020-06-30 15:20:39 +0300 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2020-06-30 09:33:02 -0600 |
| commit | 8eb06d7e8dd853d70668617dda57de4f6cebe651 (patch) | |
| tree | 3f6b900bd1bb9d89b6c1dd8b51e509476f4deafb /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | io_uring: optimise io_req_find_next() fast check (diff) | |
| download | wireguard-linux-8eb06d7e8dd853d70668617dda57de4f6cebe651.tar.xz wireguard-linux-8eb06d7e8dd853d70668617dda57de4f6cebe651.zip | |
io_uring: fix missing ->mm on exit
There is a fancy bug, where exiting user task may not have ->mm,
that makes task_works to try to do kthread_use_mm(ctx->sqo_mm).
Don't do that if sqo_mm is NULL.
[ 290.460558] WARNING: CPU: 6 PID: 150933 at kernel/kthread.c:1238
kthread_use_mm+0xf3/0x110
[ 290.460579] CPU: 6 PID: 150933 Comm: read-write2 Tainted: G
I E 5.8.0-rc2-00066-g9b21720607cf #531
[ 290.460580] RIP: 0010:kthread_use_mm+0xf3/0x110
...
[ 290.460584] Call Trace:
[ 290.460584] __io_sq_thread_acquire_mm.isra.0.part.0+0x25/0x30
[ 290.460584] __io_req_task_submit+0x64/0x80
[ 290.460584] io_req_task_submit+0x15/0x20
[ 290.460585] task_work_run+0x67/0xa0
[ 290.460585] do_exit+0x35d/0xb70
[ 290.460585] do_group_exit+0x43/0xa0
[ 290.460585] get_signal+0x140/0x900
[ 290.460586] do_signal+0x37/0x780
[ 290.460586] __prepare_exit_to_usermode+0x126/0x1c0
[ 290.460586] __syscall_return_slowpath+0x3b/0x1c0
[ 290.460587] do_syscall_64+0x5f/0xa0
[ 290.460587] entry_SYSCALL_64_after_hwframe+0x44/0xa9
following with faults.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions