list_del corruption. prev->next should be ffff888096bbfc30, but was ffff88808bf3eef0
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:51!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9053 Comm: syz-executor.3 Not tainted 5.5.0-rc1-next-20191211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid.cold+0xf/0x4f lib/list_debug.c:51
Code: e8 c9 00 cb fd 0f 0b 48 89 f1 48 c7 c7 c0 10 70 88 4c 89 e6 e8 b5 00 cb fd 0f 0b 4c 89 f6 48 c7 c7 60 12 70 88 e8 a4 00 cb fd <0f> 0b 4c 89 ea 4c 89 f6 48 c7 c7 a0 11 70 88 e8 90 00 cb fd 0f 0b
RSP: 0018:ffffc90002767a88 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffff8880aa002300 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815e8576 RDI: fffff520004ecf43
RBP: ffffc90002767aa0 R08: 0000000000000054 R09: ffffed1015d06621
R10: ffffed1015d06620 R11: ffff8880ae833107 R12: ffff8880aa002400
R13: ffff88808bf3eef0 R14: ffff888096bbfc30 R15: ffff888096bbfc30
FS:  00000000020e4940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000738000 CR3: 000000006aa98000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:131 [inline]
 dentry_unlist fs/dcache.c:522 [inline]
 __dentry_kill+0x1fd/0x600 fs/dcache.c:575
 dentry_kill fs/dcache.c:698 [inline]
 dput+0x62f/0xe10 fs/dcache.c:859
 simple_recursive_removal+0x5bc/0x6d0 fs/libfs.c:302
 debugfs_remove fs/debugfs/inode.c:713 [inline]
 debugfs_remove+0x5e/0x80 fs/debugfs/inode.c:707
 bdi_debug_unregister mm/backing-dev.c:119 [inline]
 bdi_unregister+0x401/0x610 mm/backing-dev.c:1015
 release_bdi mm/backing-dev.c:1032 [inline]
 kref_put include/linux/kref.h:65 [inline]
 bdi_put+0x1ca/0x200 mm/backing-dev.c:1041
 generic_shutdown_super+0x2b0/0x370 fs/super.c:476
 kill_anon_super+0x3e/0x60 fs/super.c:1106
 fuse_kill_sb_anon+0x1e/0x30 fs/fuse/inode.c:1341
 deactivate_locked_super+0x95/0x100 fs/super.c:335
 deactivate_super fs/super.c:366 [inline]
 deactivate_super+0x1b2/0x1d0 fs/super.c:362
 cleanup_mnt+0x351/0x4c0 fs/namespace.c:1102
 __cleanup_mnt+0x16/0x20 fs/namespace.c:1109
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d337
Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 4d 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffef2cc1e88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000045d337
RDX: 0000000000403710 RSI: 0000000000000002 RDI: 00007ffef2cc1f30
RBP: 0000000000000597 R08: 0000000000000000 R09: 000000000000000b
R10: 0000000000000005 R11: 0000000000000206 R12: 00007ffef2cc2fc0
R13: 00000000020e5940 R14: 0000000000000000 R15: 00007ffef2cc2fc0
Modules linked in:
---[ end trace 56430aa71249ff21 ]---
RIP: 0010:__list_del_entry_valid.cold+0xf/0x4f lib/list_debug.c:51
Code: e8 c9 00 cb fd 0f 0b 48 89 f1 48 c7 c7 c0 10 70 88 4c 89 e6 e8 b5 00 cb fd 0f 0b 4c 89 f6 48 c7 c7 60 12 70 88 e8 a4 00 cb fd <0f> 0b 4c 89 ea 4c 89 f6 48 c7 c7 a0 11 70 88 e8 90 00 cb fd 0f 0b
RSP: 0018:ffffc90002767a88 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffff8880aa002300 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815e8576 RDI: fffff520004ecf43
RBP: ffffc90002767aa0 R08: 0000000000000054 R09: ffffed1015d06621
R10: ffffed1015d06620 R11: ffff8880ae833107 R12: ffff8880aa002400
R13: ffff88808bf3eef0 R14: ffff888096bbfc30 R15: ffff888096bbfc30
FS:  00000000020e4940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000738000 CR3: 000000006aa98000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400