bisecting fixing commit since b5d903c2d656e9bc54bc76554a477d796a63120d
building syzkaller on 27c5f59f504f562333e3cd5e715fea5cb69c396e
testing commit b5d903c2d656e9bc54bc76554a477d796a63120d with gcc (GCC) 8.1.0
run #0: crashed: WARNING in __blkdev_put
run #1: crashed: WARNING in __blkdev_put
run #2: crashed: WARNING in __blkdev_put
run #3: crashed: WARNING in __blkdev_put
run #4: crashed: WARNING in corrupted
run #5: crashed: WARNING in blkdev_put
run #6: crashed: WARNING in __blkdev_put
run #7: crashed: WARNING in __blkdev_put
run #8: crashed: kernel BUG at fs/block_dev.c:LINE!
run #9: crashed: kernel BUG at fs/block_dev.c:LINE!
testing current HEAD d6d5df1db6e9d7f8f76d2911707f7d5877251b02
testing commit d6d5df1db6e9d7f8f76d2911707f7d5877251b02 with gcc (GCC) 8.1.0
run #0: crashed: WARNING in blkdev_put
run #1: crashed: kernel BUG at fs/block_dev.c:LINE!
run #2: crashed: WARNING in __blkdev_put
run #3: crashed: kernel BUG at fs/block_dev.c:LINE!
run #4: crashed: kernel BUG at fs/block_dev.c:LINE!
run #5: crashed: WARNING in blkdev_put
run #6: crashed: kernel BUG at fs/block_dev.c:LINE!
run #7: crashed: kernel BUG at fs/block_dev.c:LINE!
run #8: crashed: WARNING in blkdev_put
run #9: OK
revisions tested: 2, total time: 26m27.277047525s (build: 10m5.534806659s, test: 15m14.250024808s)
the crash still happens on HEAD
crash: WARNING in blkdev_put
 loop1: [CUMANA/ADFS] p1 [Linux] p2 [ADFS] p1 [Linux] p2
loop1: partition table partially beyond EOD, truncated
loop1: p1 size 135963288 extends beyond EOD, truncated
loop1: p2 start 1279850000 is beyond EOD, truncated
------------[ cut here ]------------
WARNING: CPU: 0 PID: 14867 at fs/block_dev.c:1900 blkdev_put+0x3ed/0x480 fs/block_dev.c:1899
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 14867 Comm: syz-executor5 Not tainted 5.4.0-rc5 #0
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+0x115/0x167 lib/dump_stack.c:113
 panic+0x22a/0x4f5 kernel/panic.c:221
 __warn.cold.11+0x25/0x2e kernel/panic.c:582
 report_bug+0x1b0/0x270 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:blkdev_put+0x3ed/0x480 fs/block_dev.c:1900
Code: ef fc ff ff 48 89 55 d0 e8 20 e5 e9 ff 48 8b 55 d0 e9 43 fd ff ff 48 89 d7 e8 0f e5 e9 ff e9 6e fd ff ff 0f 0b e9 de fc ff ff <0f> 0b e9 3f fd ff ff e8 17 e5 e9 ff e9 4f fc ff ff 4c 89 ff 48 89
RSP: 0000:ffff8881c62cf9d0 EFLAGS: 00010297
RAX: 00000000ffffffff RBX: ffff8881d9d311c0 RCX: 1ffff110395206dd
RDX: ffff8881d9d31268 RSI: 0000000000000004 RDI: ffff8881ca9036e8
RBP: ffff8881c62cfa00 R08: 0000000000000004 R09: ffffed1038c59f27
R10: ffffed1038c59f27 R11: 0000000000000003 R12: ffff8881d9d311d8
R13: 00000000080a009d R14: ffff8881ca903640 R15: ffff8881d9d31280
 blkdev_close+0x88/0xd0 fs/block_dev.c:1936
 __fput+0x25a/0x780 fs/file_table.c:280
 ____fput+0x9/0x10 fs/file_table.c:313
 task_work_run+0x10e/0x190 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9b9/0x2d40 kernel/exit.c:817
 do_group_exit+0xf4/0x2e0 kernel/exit.c:921
 get_signal+0x368/0x1d10 kernel/signal.c:2734
 do_signal+0x87/0x16c0 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x114/0x210 arch/x86/entry/common.c:159
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x4f4/0x5e0 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455ae7
Code: Bad RIP value.
RSP: 002b:00007fecbbabfa18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffff4 RBX: 00007fecbbac06d4 RCX: 0000000000455ae7
RDX: 0000000000000006 RSI: 0000000000004c00 RDI: 0000000000000007
RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 00007fecbbac06d4
R13: 0000000000000006 R14: 0000000000000007 R15: 0000000000000001
Kernel Offset: disabled
Rebooting in 86400 seconds..