syzbot


INFO: task hung in io_sq_thread_park (2)
Status: upstream: reported syz repro on 2021/07/15 03:19
Reported-by: syzbot+ac957324022b7132accf@syzkaller.appspotmail.com
Fix commit: 46fee9ab02cb io_uring: remove double poll entry on arm failure
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32 ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386]
First crash: 68d, last: 68d

Cause bisection: introduced by (bisect log) :
commit 4d004099a668c41522242aa146a38cc4eb59cb1e
Author: Peter Zijlstra <peterz@infradead.org>
Date: Fri Oct 2 09:04:21 2020 +0000

  lockdep: Fix lockdep recursion

Crash: BUG: using __this_cpu_read() in preemptible code in trace_hardirqs_on (log)
Repro: syz .config
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in io_sq_thread_park C unreliable 263 195d 200d 22/22 fixed on 2021/04/09 19:46
Patch testing requests:
Created Duration User Patch Repo Result
2021/07/19 16:57 16m asml.silence@gmail.com https://github.com/isilence/linux.git syztest_sqpoll_hang OK
2021/07/19 13:15 12m asml.silence@gmail.com https://github.com/isilence/linux.git syztest_sqpoll_hang report log
2021/07/16 10:38 16m asml.silence@gmail.com https://github.com/isilence/linux.git syztest_sqpoll_hang report log
2021/07/15 18:16 13m asml.silence@gmail.com https://github.com/isilence/linux.git syztest_sqpoll_hang report log
2021/07/15 08:44 15m asml.silence@gmail.com git://git.kernel.dk/linux-block io_uring-5.14 report log

Sample crash report:

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2021/07/11 03:04 upstream 3dbdb38e2869 8f5a7b8c .config log report syz INFO: task hung in io_sq_thread_park
ci-upstream-kasan-gce-root 2021/07/11 00:12 upstream 3dbdb38e2869 8f5a7b8c .config log report info INFO: task hung in io_sq_thread_park