WARNING: CPU: 0 PID: 8341 at lib/refcount.c:28 refcount_warn_saturate+0xd8/0xe0 lib/refcount.c:28
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8341 Comm: syz-executor.1 Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xa3/0xcc lib/dump_stack.c:118
 panic+0x16e/0x353 kernel/panic.c:231
 __warn.cold.13+0x20/0x2c kernel/panic.c:600
 report_bug+0xc0/0xf0 lib/bug.c:198
 handle_bug+0x35/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x13/0x60 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:refcount_warn_saturate+0xd8/0xe0 lib/refcount.c:28
Code: ff 48 c7 c7 a0 16 14 84 c6 05 f6 bf b8 02 01 e8 09 c4 40 ff 0f 0b c3 48 c7 c7 48 16 14 84 c6 05 e2 bf b8 02 01 e8 f3 c3 40 ff <0f> 0b c3 0f 1f 44 00 00 8b 07 3d 00 00 00 c0 74 12 83 f8 01 74 46
RSP: 0018:ffffc900027d7968 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffc900027d7af0 RCX: 0000000000000001
RDX: 0000000080000001 RSI: ffffffff8424c4ce RDI: 00000000ffffffff
RBP: ffffc900027d7a80 R08: 0000000000000001 R09: 0000000000000001
R10: ffff88810ed640c0 R11: 8530591fa3f72658 R12: ffffc900027d79f8
R13: ffff88812ac3a660 R14: 00000000fffffff4 R15: ffff888110e00100
 __skb_queue_purge include/linux/skbuff.h:2794 [inline]
 tipc_mcast_xmit+0xfb/0x580 net/tipc/bcast.c:422
 tipc_sendmcast+0x44d/0x550 net/tipc/socket.c:865
 __tipc_sendmsg+0x57c/0x7a0 net/tipc/socket.c:1454
 tipc_sendmsg+0x2b/0x40 net/tipc/socket.c:1387
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0x2b/0x40 net/socket.c:671
 ____sys_sendmsg+0x1ed/0x230 net/socket.c:2353
 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407
 __sys_sendmsg+0x52/0xa0 net/socket.c:2440
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45dd99
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5dd35aec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002e740 RCX: 000000000045dd99
RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003
RBP: 00007f5dd35aeca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00007ffe7b9716ef R14: 00007f5dd35af9c0 R15: 000000000118bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..