[syzbot] general protection fault in rxrpc_unbundle_conn

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ccfff0a2bd2a Merge tag 'virtio-mem-for-5.16' of git://gith..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1087de21b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=66be9d86baea8a4a
dashboard link: https://syzkaller.appspot.com/bug?extid=078e7e5466f101cd2ba6
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2

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+078e7e...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 21485 Comm: kworker/1:8 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krxrpcd rxrpc_local_processor
RIP: 0010:____rb_erase_color lib/rbtree.c:354 [inline]
RIP: 0010:rb_erase+0x615/0xf40 lib/rbtree.c:445
Code: 83 01 00 00 90 48 8d 5d 10 48 89 dd 48 c1 ed 03 42 80 7c 3d 00 00 74 08 48 89 df e8 55 0c 94 fd 4c 8b 2b 4d 89 ee 49 c1 ee 03 <43> 80 3c 3e 00 74 08 4c 89 ef e8 3c 0c 94 fd 41 f6 45 00 01 48 89
RSP: 0018:ffffc90004c4fa50 EFLAGS: 00010246
RAX: 1ffff11002a7c7ae RBX: ffff8880199a6e80 RCX: dffffc0000000000
RDX: ffff88801d7f3a00 RSI: ffff8880899311d0 RDI: ffff88801e52c478
RBP: 1ffff11003334dd0 R08: ffffffff8943b24b R09: 0000000000000003
R10: fffff52000989f45 R11: 0000000000000004 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562128df3158 CR3: 000000006f090000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
rxrpc_unbundle_conn+0x441/0x5f0 net/rxrpc/conn_client.c:927
rxrpc_clean_up_local_conns+0x485/0x570 net/rxrpc/conn_client.c:1112
rxrpc_local_destroyer net/rxrpc/local_object.c:377 [inline]
rxrpc_local_processor+0x486/0x640 net/rxrpc/local_object.c:411
process_one_work+0x853/0x1140 kernel/workqueue.c:2298
worker_thread+0xac1/0x1320 kernel/workqueue.c:2445
kthread+0x468/0x490 kernel/kthread.c:327
ret_from_fork+0x1f/0x30
</TASK>
Modules linked in:
---[ end trace 46cd0dc6be526c5b ]---
RIP: 0010:____rb_erase_color lib/rbtree.c:354 [inline]
RIP: 0010:rb_erase+0x615/0xf40 lib/rbtree.c:445
Code: 83 01 00 00 90 48 8d 5d 10 48 89 dd 48 c1 ed 03 42 80 7c 3d 00 00 74 08 48 89 df e8 55 0c 94 fd 4c 8b 2b 4d 89 ee 49 c1 ee 03 <43> 80 3c 3e 00 74 08 4c 89 ef e8 3c 0c 94 fd 41 f6 45 00 01 48 89
RSP: 0018:ffffc90004c4fa50 EFLAGS: 00010246
RAX: 1ffff11002a7c7ae RBX: ffff8880199a6e80 RCX: dffffc0000000000
RDX: ffff88801d7f3a00 RSI: ffff8880899311d0 RDI: ffff88801e52c478
RBP: 1ffff11003334dd0 R08: ffffffff8943b24b R09: 0000000000000003
R10: fffff52000989f45 R11: 0000000000000004 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562128df3158 CR3: 000000006f090000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 83 01 00 addl $0x0,(%rcx)
3: 00 90 48 8d 5d 10 add %dl,0x105d8d48(%rax)
9: 48 89 dd mov %rbx,%rbp
c: 48 c1 ed 03 shr $0x3,%rbp
10: 42 80 7c 3d 00 00 cmpb $0x0,0x0(%rbp,%r15,1)
16: 74 08 je 0x20
18: 48 89 df mov %rbx,%rdi
1b: e8 55 0c 94 fd callq 0xfd940c75
20: 4c 8b 2b mov (%rbx),%r13
23: 4d 89 ee mov %r13,%r14
26: 49 c1 ee 03 shr $0x3,%r14
* 2a: 43 80 3c 3e 00 cmpb $0x0,(%r14,%r15,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ef mov %r13,%rdi
34: e8 3c 0c 94 fd callq 0xfd940c75
39: 41 f6 45 00 01 testb $0x1,0x0(%r13)
3e: 48 rex.W
3f: 89 .byte 0x89


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[syzbot]

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