[syzbot] [netfs?] kernel BUG in __fscache_relinquish_cookie (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 596764183be8 Add linux-next specific files for 20240129
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1571092fe80000
kernel config: https://syzkaller.appspot.com/x/.config?x=584144ad19f381aa
dashboard link: https://syzkaller.appspot.com/bug?extid=ccef0a87d907980eed03
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b647c038857b/disk-59676418.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/729e26c3ac55/vmlinux-59676418.xz
kernel image: https://storage.googleapis.com/syzbot-assets/15aa5e287059/bzImage-59676418.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ccef0a...@syzkaller.appspotmail.com

netfs:
netfs: Assertion failed
netfs: ffffffffadacafae == 0 is false
------------[ cut here ]------------
kernel BUG at fs/netfs/fscache_cookie.c:985!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 PID: 22343 Comm: syz-executor.0 Not tainted 6.8.0-rc1-next-20240129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:__fscache_relinquish_cookie+0x4e8/0x620 fs/netfs/fscache_cookie.c:985
Code: e8 83 e0 07 83 c0 03 38 d0 7c 0c 84 d2 74 08 48 89 ef e8 cb d4 b8 ff 48 63 73 04 31 d2 48 c7 c7 c0 a2 22 8b e8 b9 29 40 ff 90 <0f> 0b e8 c1 51 5e ff 48 c7 c7 40 a2 22 8b e8 a5 29 40 ff 48 c7 c7
RSP: 0018:ffffc90014417b00 EFLAGS: 00010282
RAX: 0000000000000025 RBX: ffff88823bd40ee8 RCX: ffffc9000cded000
RDX: 0000000000000000 RSI: ffffffff816eb7e6 RDI: 0000000000000005
RBP: ffff88823bd40eec R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: fffffffffffc94f8 R12: ffff88823bd40fd8
R13: 00000000adacafae R14: 000000000003c0cc R15: ffff8880750f29c0
FS: 00007f4f507ef6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f41889747a0 CR3: 000000007c79e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
fscache_relinquish_cookie include/linux/fscache.h:308 [inline]
v9fs_evict_inode+0x102/0x150 fs/9p/vfs_inode.c:356
evict+0x2ed/0x6c0 fs/inode.c:666
iput_final fs/inode.c:1740 [inline]
iput.part.0+0x573/0x7c0 fs/inode.c:1766
iput+0x5c/0x80 fs/inode.c:1756
v9fs_fid_iget_dotl+0x1b4/0x260 fs/9p/vfs_inode_dotl.c:96
v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline]
v9fs_mount+0x515/0xa90 fs/9p/vfs_super.c:142
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1784
do_new_mount fs/namespace.c:3352 [inline]
path_mount+0x14e6/0x1f20 fs/namespace.c:3679
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount fs/namespace.c:3875 [inline]
__x64_sys_mount+0x297/0x320 fs/namespace.c:3875
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f4f4fa7cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4f507ef0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4f4fbabf80 RCX: 00007f4f4fa7cda9
RDX: 0000000020000140 RSI: 0000000020000400 RDI: 0000000000000000
RBP: 00007f4f4fac947a R08: 00000000200007c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f4f4fbabf80 R15: 00007ffd6430a4a8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__fscache_relinquish_cookie+0x4e8/0x620 fs/netfs/fscache_cookie.c:985
Code: e8 83 e0 07 83 c0 03 38 d0 7c 0c 84 d2 74 08 48 89 ef e8 cb d4 b8 ff 48 63 73 04 31 d2 48 c7 c7 c0 a2 22 8b e8 b9 29 40 ff 90 <0f> 0b e8 c1 51 5e ff 48 c7 c7 40 a2 22 8b e8 a5 29 40 ff 48 c7 c7
RSP: 0018:ffffc90014417b00 EFLAGS: 00010282
RAX: 0000000000000025 RBX: ffff88823bd40ee8 RCX: ffffc9000cded000
RDX: 0000000000000000 RSI: ffffffff816eb7e6 RDI: 0000000000000005
RBP: ffff88823bd40eec R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: fffffffffffc94f8 R12: ffff88823bd40fd8
R13: 00000000adacafae R14: 000000000003c0cc R15: ffff8880750f29c0
FS: 00007f4f507ef6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efe021a8000 CR3: 000000007c79e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.