On Fri, Apr 6, 2018 at 4:27 PM, Jens Axboe <axboe@xxxxxxxxx> wrote: > On 4/6/18 7:02 AM, syzbot wrote: >> Hello, >> >> syzbot hit the following crash on upstream commit >> 38c23685b273cfb4ccf31a199feccce3bdcb5d83 (Fri Apr 6 04:29:35 2018 +0000) >> Merge tag 'armsoc-drivers' of >> git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc >> syzbot dashboard link: >> https://syzkaller.appspot.com/bug?extid=31e8daa8b3fc129e75f2 >> >> So far this crash happened 9 times on upstream. >> C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6407930337296384 >> syzkaller reproducer: >> https://syzkaller.appspot.com/x/repro.syz?id=4942413340606464 >> Raw console output: >> https://syzkaller.appspot.com/x/log.txt?id=4764483918495744 >> Kernel config: >> https://syzkaller.appspot.com/x/.config?id=-5813481738265533882 >> compiler: gcc (GCC) 8.0.1 20180301 (experimental) >> >> IMPORTANT: if you fix the bug, please add the following tag to the commit: >> Reported-by: syzbot+31e8daa8b3fc129e75f2@xxxxxxxxxxxxxxxxxxxxxxxxx >> It will help syzbot understand when the bug is fixed. See footer for >> details. >> If you forward the report, please keep this part and the footer. >> >> >> ================================================ >> WARNING: lock held when returning to user space! >> 4.16.0+ #3 Not tainted >> ------------------------------------------------ >> syzkaller433111/4462 is leaving the kernel with locks still held! >> 1 lock held by syzkaller433111/4462: >> #0: 0000000003a06fae (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x1ec0 >> drivers/block/loop.c:1363 > > Is this a new regression? Omar did just fiddle with the locking a bit, > seems suspicious. Looking at: https://syzkaller.appspot.com/bug?extid=31e8daa8b3fc129e75f2 It first happened 4 hours ago and 9 times since then, so probably a just introduced regression. > -- > Jens Axboe > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0e998b77-14f0-aee0-8d32-bc1dd96fcc4c%40kernel.dk. > For more options, visit https://groups.google.com/d/optout.
