Re: INFO: task hung in __sb_start_write (2)

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Tetsuo Handa

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Sep 12, 2018, 6:15:02 AM9/12/18
to syzbot+a434af...@syzkaller.appspotmail.com, syzkaller
syzbot is hitting ext4_shutdown() case via ioctl(EXT4_IOC_SHUTDOWN).
This case should be considered as a syzkaller bug.


[ 311.546143] EXT4-fs (sda1): shut down requested (0)
[ 474.527484] INFO: task syz-executor5:4829 blocked for more than 140 seconds.

[ 1285.854659] EXT4-fs (sda1): shut down requested (0)
[ 1434.857775] INFO: task rs:main Q:Reg:5210 blocked for more than 140 seconds.

[ 1561.403456] EXT4-fs (sda1): shut down requested (0)
[ 1721.686807] INFO: task rs:main Q:Reg:4185 blocked for more than 140 seconds.

Dmitry Vyukov

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Sep 17, 2018, 10:02:59 AM9/17/18
to Tetsuo Handa, syzbot+a434af...@syzkaller.appspotmail.com, syzkaller, 'Dmitry Vyukov' via syzkaller-upstream-moderation
This now should be fixed by:
https://github.com/google/syzkaller/commit/61ed43a86a3721708aeeee72b23bfa1eacd921b2

Thanks for debugging this!

#syz invalid
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