On Thu, Nov 1, 2018 at 12:05 PM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > On Thu, Nov 1, 2018 at 11:49 AM, syzbot > <syzbot+6339eda9cb4ebbc4c37b@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: >> Hello, >> >> syzbot found the following crash on: >> >> HEAD commit: 59fc453b21f7 Merge branch 'akpm' (patches from Andrew) >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=15fb2447400000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=ea045471e4c756e8 >> dashboard link: https://syzkaller.appspot.com/bug?extid=6339eda9cb4ebbc4c37b >> compiler: gcc (GCC) 8.0.1 20180413 (experimental) >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=178a105d400000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16651133400000 > > > I can easily reproduce this. I can't reproduce on my meager dual core notebook. > > The repro gives me a task hanged at: > > # cat /proc/7563/task/*/stack > [<0>] fuse_wait_aborted+0x20b/0x320 > [<0>] fuse_sb_destroy+0xe2/0x1d0 > [<0>] fuse_kill_sb_anon+0x15/0x20 > [<0>] deactivate_locked_super+0x97/0x100 > [<0>] deactivate_super+0x2bb/0x320 > [<0>] cleanup_mnt+0xbf/0x160 > [<0>] __cleanup_mnt+0x16/0x20 > [<0>] task_work_run+0x1e8/0x2a0 > [<0>] exit_to_usermode_loop+0x318/0x380 > [<0>] do_syscall_64+0x6be/0x820 > [<0>] entry_SYSCALL_64_after_hwframe+0x49/0xbe > [<0>] 0xffffffffffffffff > > I double checked that writing to /sys/fs/fuse/connections/44/abort did > not help (the only entry in fuse/connections). Wrote multiple times, > and tried to kill the task, nothing helps. What's the output of cat /sys/fs/fuse/connections/NN/waiting ? Thanks, Miklos
