syzbot


INFO: task hung in __io_uring_cancel
Status: upstream: reported C repro on 2021/04/19 21:10
Reported-by: syzbot+47fc00967b06a3019bd2@syzkaller.appspotmail.com
Fix commit: 28090c133869 io_uring: fix work_exit sqpoll cancellations
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-kmsan-gce ci-upstream-kmsan-gce-386 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]
First crash: 97d, last: 30d

Cause bisection: introduced by (bisect log) :
commit d9d05217cb6990b9a56e13b56e7a1b71e2551f6c
Author: Pavel Begunkov <asml.silence@gmail.com>
Date: Fri Jan 8 20:57:25 2021 +0000

  io_uring: stop SQPOLL submit on creator's death

Crash: WARNING in io_uring_flush (log)
Repro: C syz .config
Patch testing requests:
Created Duration User Patch Repo Result
2021/05/07 19:49 20m asml.silence@gmail.com git://git.kernel.dk/linux-block io_uring-5.13 OK
2021/04/19 22:24 19m asml.silence@gmail.com git://git.kernel.dk/linux-block for-5.13/io_uring report log

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 2021/04/19 00:59 linux-next 1216f02e46a4 7e2b734b .config log report syz C INFO: task hung in __io_uring_cancel
ci-upstream-kasan-gce-selinux-root 2021/06/24 20:34 upstream 4a09d388f2ab 0edbbe31 .config log report info INFO: task hung in __io_uring_cancel
ci-upstream-linux-next-kasan-gce-root 2021/04/19 18:37 linux-next 1216f02e46a4 50f523d7 .config log report info INFO: task hung in __io_uring_cancel
ci-upstream-linux-next-kasan-gce-root 2021/04/18 22:59 linux-next 1216f02e46a4 7e2b734b .config log report info INFO: task hung in __io_uring_cancel
ci-upstream-linux-next-kasan-gce-root 2021/04/18 22:40 linux-next 1216f02e46a4 7e2b734b .config log report info INFO: task hung in __io_uring_cancel