WARNING in blkdev_put

From: syzbot
Date: Fri Jun 15 2018 - 13:37:10 EST


syzbot found the following crash on:

HEAD commit: b5d903c2d656 Merge branch 'akpm' (patches from Andrew)
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10ffb720400000
kernel config: https://syzkaller.appspot.com/x/.config?x=caf58998a7a0564
dashboard link: https://syzkaller.appspot.com/bug?extid=139144b4a81f1a848264
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=17dc2720400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+139144b4a81f1a848264@xxxxxxxxxxxxxxxxxxxxxxxxx

loop3: p2 start 1279850000 is beyond EOD, truncated
loop2: p2 start 1279850000 is beyond EOD, truncated
loop5: [CUMANA/ADFS] p1 [Linux] p2 [ADFS] p1 [Linux] p2
loop5: partition table partially beyond EOD, truncated
loop5: p1 size 135963288 extends beyond EOD, truncated
WARNING: CPU: 1 PID: 12785 at fs/block_dev.c:1826 blkdev_put+0x4bd/0x540 fs/block_dev.c:1826
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 12785 Comm: syz-executor0 Not tainted 4.17.0+ #103
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
panic+0x238/0x4e7 kernel/panic.c:184
__warn.cold.8+0x163/0x1ba kernel/panic.c:536
report_bug+0x252/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:blkdev_put+0x4bd/0x540 fs/block_dev.c:1826
Code: 1f e4 ff 48 8b 55 d0 e9 bb fc ff ff 4c 89 ff e8 e9 1f e4 ff e9 fa fc ff ff e8 ff 54 a6 ff 0f 0b e9 4c fc ff ff e8 f3 54 a6 ff <0f> 0b e9 bc fc ff ff e8 e7 1f e4 ff e9 9c fb ff ff 4c 89 f7 e8 da
RSP: 0018:ffff8801d68875b0 EFLAGS: 00010293
RAX: ffff8801c73304c0 RBX: ffff8801a7cec040 RCX: ffffffff81d55115
RDX: 0000000000000000 RSI: ffffffff81d5545d RDI: 0000000000000005
RBP: ffff8801d68875e8 R08: ffff8801c73304c0 R09: fffffbfff11c24f0
R10: fffffbfff11c24f0 R11: ffffffff88e12783 R12: ffff8801a7cec058
R13: 000000000802009d R14: ffff8801a7cec100 R15: ffff8801a7cec0e8
blkdev_close+0x8b/0xb0 fs/block_dev.c:1862
__fput+0x35b/0x8b0 fs/file_table.c:209
____fput+0x15/0x20 fs/file_table.c:243
task_work_run+0x1ec/0x2a0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x1b08/0x2750 kernel/exit.c:865
do_group_exit+0x177/0x440 kernel/exit.c:968
__do_sys_exit_group kernel/exit.c:979 [inline]
__se_sys_exit_group kernel/exit.c:977 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:977
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
RIP: 0033:0x455b29
Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd05327218 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00000000000000dd RCX: 0000000000455b29
RDX: 0000000000000511 RSI: 0000000000731468 RDI: 0000000000000000
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000001380
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

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