syzbot


INFO: task hung in perf_event_free_task
Status: upstream: reported C repro on 2019/07/24 19:18
Reported-by: syzbot+7692cea7450c97fa2a0a@syzkaller.appspotmail.com
First crash: 795d, last: 4h22m

Cause bisection: introduced by (bisect log) :
commit 1cf8dfe8a661f0462925df943140e9f6d1ea5233
Author: Peter Zijlstra <peterz@infradead.org>
Date: Sat Jul 13 09:21:25 2019 +0000

  perf/core: Fix race between close() and fork()

Crash: INFO: task hung in perf_event_free_task (log)
Repro: syz .config

Fix bisection: failed (bisect log)
similar bugs (3):
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 131d 203d 0/1 auto-closed as invalid on 2021/09/09 09:13
linux-4.19 INFO: task hung in perf_event_free_task 5 345d 740d 0/1 auto-closed as invalid on 2021/02/06 21:15
upstream INFO: task can't die in perf_event_free_task syz unreliable 5 39d 304d 0/22 upstream: reported syz repro on 2020/11/19 15:42

Sample crash report:

Crashes (32):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2021/04/20 09:09 upstream 7af08140979a 4285c989 .config log report syz C INFO: task hung in perf_event_free_task
ci-upstream-kasan-gce-smack-root 2019/08/27 04:11 upstream a55aa89aab90 d21c5d9d .config log report syz
ci-upstream-kasan-gce-smack-root 2019/08/16 13:14 upstream 329120423947 8fd428a1 .config log report syz
ci-upstream-kasan-gce-smack-root 2019/08/11 10:45 upstream 296d05cb0d3c acb51638 .config log report syz
ci-upstream-kasan-gce-smack-root 2019/08/05 10:56 upstream e21a712a9685 6affd8e8 .config log report syz
ci-upstream-kasan-gce-root 2019/08/05 10:44 upstream e21a712a9685 6affd8e8 .config log report syz
ci-upstream-kasan-gce-root 2019/08/04 04:49 upstream dcb8cfbd8fe9 6affd8e8 .config log report syz
ci-upstream-kasan-gce-smack-root 2019/07/24 13:05 upstream c6dd78fcb8ee 32329ceb .config log report syz
ci-upstream-linux-next-kasan-gce-root 2019/07/24 13:57 linux-next 9e6dfe8045f8 32329ceb .config log report syz
ci-upstream-kasan-gce-smack-root 2021/09/20 04:58 upstream 20621d2f27a0 70b76c1d .config log report info INFO: task hung in perf_event_free_task
ci-upstream-kasan-gce-smack-root 2021/07/06 23:27 upstream 3dbdb38e2869 cca78469 .config log report info INFO: task hung in perf_event_free_task
ci-upstream-kasan-gce-selinux-root 2021/05/22 19:15 upstream 23d729263037 3c7fef33 .config log report info INFO: task hung in perf_event_free_task
ci-upstream-kasan-gce-selinux-root 2021/05/17 09:08 upstream d07f6ca923ea a2eb125d .config log report info INFO: task hung in perf_event_free_task
ci-upstream-kasan-gce-root 2020/09/24 08:37 upstream c9c9e6a49f89 54289b08 .config log report info
ci-upstream-kasan-gce 2020/09/07 15:45 upstream a8205e310011 abf9ba4f .config log report
ci-upstream-kasan-gce 2020/02/21 18:25 upstream ca7e1fd1026c bd2a74a3 .config log report
ci-upstream-kasan-gce 2020/02/10 12:23 upstream bb6d3fb354c5 35f5e45e .config log report
ci-upstream-kasan-gce-smack-root 2020/02/02 16:03 upstream 94f2630b1897 93e5e335 .config log report
ci-upstream-kasan-gce 2020/01/19 11:58 upstream 244dc2689085 bc8bc756 .config log report
ci-upstream-kasan-gce-selinux-root 2019/12/31 00:51 upstream fd6988496e79 7f117e28 .config log report
ci-upstream-kasan-gce-selinux-root 2019/10/26 07:28 upstream 8caacaad78b6 413926c5 .config log report
ci-upstream-kasan-gce-smack-root 2019/08/22 19:07 upstream bb7ba8069de9 d003d6d0 .config log report
ci-upstream-kasan-gce-selinux-root 2019/07/17 14:12 upstream 3eb514866f20 0d10349c .config log report
ci-upstream-kasan-gce-386 2020/05/31 01:34 upstream ffeb595d8481 6f3e1c7c .config log report
ci-upstream-kasan-gce-386 2020/02/27 19:22 upstream f8788d86ab28 59b57593 .config log report
ci-upstream-kasan-gce-386 2019/09/01 23:58 upstream 9f159ae07f07 bad3cce2 .config log report
ci-upstream-kasan-gce-386 2019/07/24 18:32 upstream bed38c3e2dca 32329ceb .config log report
ci-upstream-kasan-gce-386 2019/07/20 07:49 upstream 31cc088a4f5d 1656845f .config log report
ci-upstream-linux-next-kasan-gce-root 2020/04/13 07:16 linux-next 3b2804993d1e 17a986e5 .config log report
ci-upstream-linux-next-kasan-gce-root 2020/03/06 15:25 linux-next c99b17ac0399 c88c7b75 .config log report
ci-upstream-linux-next-kasan-gce-root 2019/09/12 07:15 linux-next 6d028043b55e f4e53c10 .config log report
ci-upstream-linux-next-kasan-gce-root 2019/08/19 10:51 linux-next da6570438d9b b8ceabfc .config log report