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SubjectBUG: corrupted list in __dentry_kill (2)
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Hello,

syzbot found the following crash on:

HEAD commit: 938f49c8 Add linux-next specific files for 20191211
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=150eba1ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=96834c884ba7bb81
dashboard link: https://syzkaller.appspot.com/bug?extid=31043da7725b6ec210f1
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12dc83dae00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16ac8396e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+31043da7725b6ec210f1@syzkaller.appspotmail.com

list_del corruption. prev->next should be ffff88808fd17b10, but was
ffff88808fd17590
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:51!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 393 Comm: kworker/u4:5 Not tainted
5.5.0-rc1-next-20191211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: netns cleanup_net
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:ffffc90001617980 EFLAGS: 00010286
RAX: 0000000000000054 RBX: ffff8880a1ce8840 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815e8576 RDI: fffff520002c2f22
RBP: ffffc90001617998 R08: 0000000000000054 R09: ffffed1015d26621
R10: ffffed1015d26620 R11: ffff8880ae933107 R12: ffff8880a1ce8940
R13: ffff88808fd17590 R14: ffff88808fd17b10 R15: ffff88808fd17b10
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 000000008d040000 CR4: 00000000001406e0
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
nsim_ipsec_teardown+0x7c/0x8f drivers/net/netdevsim/ipsec.c:298
nsim_destroy+0x42/0x70 drivers/net/netdevsim/netdev.c:331
__nsim_dev_port_del+0x150/0x1f0 drivers/net/netdevsim/dev.c:674
nsim_dev_port_del_all+0x8b/0xe0 drivers/net/netdevsim/dev.c:687
nsim_dev_reload_destroy+0x58/0xf0 drivers/net/netdevsim/dev.c:856
nsim_dev_reload_down+0x73/0xe0 drivers/net/netdevsim/dev.c:493
devlink_reload+0xc8/0x3c0 net/core/devlink.c:2797
devlink_pernet_pre_exit+0x104/0x1a0 net/core/devlink.c:8260
ops_pre_exit_list net/core/net_namespace.c:162 [inline]
cleanup_net+0x49b/0xaf0 net/core/net_namespace.c:585
process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
worker_thread+0x98/0xe40 kernel/workqueue.c:2410
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 700329e407063cc0 ]---
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:ffffc90001617980 EFLAGS: 00010286
RAX: 0000000000000054 RBX: ffff8880a1ce8840 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815e8576 RDI: fffff520002c2f22
RBP: ffffc90001617998 R08: 0000000000000054 R09: ffffed1015d26621
R10: ffffed1015d26620 R11: ffff8880ae933107 R12: ffff8880a1ce8940
R13: ffff88808fd17590 R14: ffff88808fd17b10 R15: ffff88808fd17b10
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 000000008d040000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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@googlegroups.com.

syzbot will keep track of this bug report. See:
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syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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