syzbot


INFO: task can't die in perf_event_free_task
Status: upstream: reported syz repro on 2020/11/19 15:42
Reported-by: syzbot+f02b92479b7065807a2a@syzkaller.appspotmail.com
First crash: 335d, last: 66d

Cause bisection: introduced by (bisect log) [no-op commit]:
commit ab2dd173330a3f07142e68cd65682205036cd00f
Author: Andy Lutomirski <luto@kernel.org>
Date: Wed Aug 26 17:00:45 2020 +0000

  selftests/x86/fsgsbase: Reap a forgotten child

Crash: INFO: task hung in perf_event_free_task (log)
Repro: syz .config
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in perf_event_free_task (2) 2 157d 229d 0/1 auto-closed as invalid on 2021/09/09 09:13
upstream INFO: task hung in perf_event_free_task C done error 33 21d 815d 0/22 upstream: reported C repro on 2019/07/24 19:18

Sample crash report:

Crashes (5):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-linux-next-kasan-gce-root 2021/08/12 00:22 linux-next 8ca403f3e7a2 6972b106 .config log report syz INFO: task can't die in perf_event_free_task
ci-upstream-linux-next-kasan-gce-root 2021/08/06 18:16 linux-next 8d4b477da1a8 f9e341e3 .config log report syz INFO: task can't die in perf_event_free_task
ci-upstream-linux-next-kasan-gce-root 2020/11/15 15:35 linux-next 92edc4aef867 1bf9a662 .config log report syz
ci-upstream-linux-next-kasan-gce-root 2021/08/06 14:48 linux-next 8d4b477da1a8 f9e341e3 .config log report info INFO: task can't die in perf_event_free_task
ci-upstream-linux-next-kasan-gce-root 2021/07/21 16:58 linux-next b1347210b01d 29c3f20f .config log report info INFO: task can't die in perf_event_free_task