On Wed, May 2, 2018 at 9:33 AM, syzbot <syzbot+bf89c128e05dd6c62523@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: fff75eb2a08c Merge tag 'errseq-v4.17' of > git://git.kernel.o... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?id=5301511529693184 > kernel config: > https://syzkaller.appspot.com/x/.config?id=6493557782959164711 > dashboard link: https://syzkaller.appspot.com/bug?extid=bf89c128e05dd6c62523 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > userspace arch: i386 > syzkaller > repro:https://syzkaller.appspot.com/x/repro.syz?id=5000693362458624 #syz dup: INFO: rcu detected stall in blkdev_ioctl > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+bf89c128e05dd6c62523@xxxxxxxxxxxxxxxxxxxxxxxxx > > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] SMP KASAN > Dumping ftrace buffer: > (ftrace buffer empty) > Modules linked in: > CPU: 0 PID: 10637 Comm: syz-executor1 Not tainted 4.17.0-rc3+ #52 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:loop_set_fd drivers/block/loop.c:901 [inline] > RIP: 0010:lo_ioctl+0x1ae8/0x2130 drivers/block/loop.c:1397 > RSP: 0018:ffff8801bd6dfc08 EFLAGS: 00010202 > RAX: 0000000000000037 RBX: ffff8801d296db00 RCX: dffffc0000000000 > RDX: 0000000000000000 RSI: ffffffff84b2cd57 RDI: 00000000000001b8 > RBP: ffff8801bd6dfc80 R08: ffff8801c46943c0 R09: ffffed003b5c46c2 > R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000 > R13: 0000000000000000 R14: ffff8801b58561a0 R15: ffff8801b58560c0 > FS: 0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f7f2eb40 > CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 > CR2: 0000000008138024 CR3: 00000001d03df000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > lo_compat_ioctl+0xc1/0x170 drivers/block/loop.c:1602 > compat_blkdev_ioctl+0x3c2/0x1b20 block/compat_ioctl.c:406 > __do_compat_sys_ioctl fs/compat_ioctl.c:1461 [inline] > __se_compat_sys_ioctl fs/compat_ioctl.c:1407 [inline] > __ia32_compat_sys_ioctl+0x221/0x640 fs/compat_ioctl.c:1407 > do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline] > do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394 > entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 > RIP: 0023:0xf7f32cb9 > RSP: 002b:00000000f7f2e0ac EFLAGS: 00000282 ORIG_RAX: 0000000000000036 > RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000004c00 > RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > Code: e8 03 80 3c 08 00 0f 85 2c 02 00 00 4d 8b ad f0 00 00 00 48 b9 00 00 > 00 00 00 fc ff df 49 8d bd b8 01 00 00 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f > 85 f9 01 00 00 4d 8b ad b8 01 00 00 48 b9 00 00 > RIP: loop_set_fd drivers/block/loop.c:901 [inline] RSP: ffff8801bd6dfc08 > RIP: lo_ioctl+0x1ae8/0x2130 drivers/block/loop.c:1397 RSP: ffff8801bd6dfc08 > ---[ end trace a15583efe355602c ]--- > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. > If you forgot to add the Reported-by tag, once the fix for this bug is > merged > into any tree, please reply to this email with: > #syz fix: exact-commit-title > If you want to test a patch for this bug, please reply with: > #syz test: git://repo/address.git branch > and provide the patch inline or as an attachment. > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body. > > -- > 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/000000000000cbaaf6056b341859%40google.com. > For more options, visit https://groups.google.com/d/optout.
