------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 7485 at lib/refcount.c:190 refcount_sub_and_test_checked+0x158/0x170 lib/refcount.c:190
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 7485 Comm: syz-executor.3 Not tainted 5.3.0+ #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+0x113/0x167 lib/dump_stack.c:113
 panic+0x223/0x4dc kernel/panic.c:220
 __warn.cold.11+0x25/0x27 kernel/panic.c:581
 report_bug+0x1b0/0x270 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:refcount_sub_and_test_checked+0x158/0x170 lib/refcount.c:190
Code: 39 e0 0f 92 c1 44 29 e0 85 c9 89 c3 74 82 80 3d e0 ba ef 05 00 75 a9 48 c7 c7 00 cf 42 87 c6 05 d0 ba ef 05 01 e8 fa 08 37 fe <0f> 0b eb 92 eb 92 4c 89 ff e8 8a 60 94 fe e9 2d ff ff ff e8 d0 02
RSP: 0018:ffff888093c4fb00 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 00000000fffffd02 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff89dc70e0
RBP: ffff888093c4fb90 R08: ffffed1015d660d1 R09: ffffed1015d660d1
R10: ffffed1015d660d0 R11: ffff8880aeb30687 R12: 00000000000002ff
R13: ffff888093c4fb68 R14: 1ffff11012789f61 R15: ffff88809b188984
 sock_wfree+0xcf/0x130 net/core/sock.c:1952
 unix_destruct_scm+0x100/0x150 net/unix/scm.c:149
 io_destruct_skb+0x5d/0x70 fs/io_uring.c:2994
 skb_release_head_state+0x9f/0x1a0 net/core/skbuff.c:652
 skb_release_all+0xd/0x50 net/core/skbuff.c:663
 __kfree_skb net/core/skbuff.c:679 [inline]
 kfree_skb+0xb3/0x2b0 net/core/skbuff.c:697
 __io_sqe_files_scm fs/io_uring.c:3048 [inline]
 io_sqe_files_scm fs/io_uring.c:3070 [inline]
 io_sqe_files_register fs/io_uring.c:3153 [inline]
 __io_uring_register+0x1401/0x1e60 fs/io_uring.c:3966
 __do_sys_io_uring_register fs/io_uring.c:4015 [inline]
 __se_sys_io_uring_register fs/io_uring.c:3997 [inline]
 __x64_sys_io_uring_register+0x16f/0x1e0 fs/io_uring.c:3997
 do_syscall_64+0xca/0x5d0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb1fa05dc78 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459a59
RDX: 0000000020000280 RSI: 0000000000000002 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 00007fb1fa05e6d4
R13: 00000000004cd4f0 R14: 00000000004d43b0 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..