kernel BUG in rxrpc_release_call

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3f8a27f9e27b Linux 4.19.211
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1571b292700000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b9277b418617afe
dashboard link: https://syzkaller.appspot.com/bug?extid=d717f1a7f982bc41c3d6
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d717f1...@syzkaller.appspotmail.com

hid-generic 0000:0000:0000.0002: unknown main item tag 0x0
hid-generic 0000:0000:0000.0002: unknown main item tag 0x0
hid-generic 0000:0000:0000.0002: hidraw0: <UNKNOWN> HID v8.03 Device [syz1] on %�z5
rxrpc: Assertion failed - 6(0x6) == 12(0xc) is false
------------[ cut here ]------------
kernel BUG at net/rxrpc/call_object.c:494!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
tmpfs: No value for mount option './file1'
CPU: 0 PID: 4715 Comm: kworker/0:3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: kafsd afs_delete_async_call
RIP: 0010:rxrpc_release_call.cold+0x2a/0x2c net/rxrpc/call_object.c:494
Code: e8 99 c8 4e f9 44 89 e6 41 b9 0c 00 00 00 41 b8 0c 00 00 00 48 c7 c1 00 c8 61 89 48 89 f2 48 c7 c7 40 c8 61 89 e8 df f9 df ff <0f> 0b e8 6d c8 4e f9 48 c7 c7 a0 d1 61 89 e8 cc f9 df ff 0f 0b e8
RSP: 0018:ffff8880b38a7c60 EFLAGS: 00010282
RAX: 0000000000000034 RBX: ffff88808e79ba40 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1016714f7e
RBP: ffff88809d16e000 R08: 0000000000000034 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000006
R13: ffff888097f174f0 R14: ffffffff87569543 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1b58b96000 CR3: 0000000097fd6000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rxrpc_kernel_end_call+0x53/0x100 net/rxrpc/af_rxrpc.c:355
afs_put_call+0x236/0xa40 fs/afs/rxrpc.c:171
process_one_work+0x864/0x1570 kernel/workqueue.c:2153
worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
---[ end trace 55a6b712dc9af38a ]---
RIP: 0010:rxrpc_release_call.cold+0x2a/0x2c net/rxrpc/call_object.c:494
Code: e8 99 c8 4e f9 44 89 e6 41 b9 0c 00 00 00 41 b8 0c 00 00 00 48 c7 c1 00 c8 61 89 48 89 f2 48 c7 c7 40 c8 61 89 e8 df f9 df ff <0f> 0b e8 6d c8 4e f9 48 c7 c7 a0 d1 61 89 e8 cc f9 df ff 0f 0b e8
RSP: 0018:ffff8880b38a7c60 EFLAGS: 00010282
RAX: 0000000000000034 RBX: ffff88808e79ba40 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1016714f7e
RBP: ffff88809d16e000 R08: 0000000000000034 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000006
R13: ffff888097f174f0 R14: ffffffff87569543 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1b58b96000 CR3: 000000009b38c000 CR4: 00000000003406f0
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.