------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 9172 at lib/refcount.c:28 refcount_warn_saturate+0x165/0x1b0 lib/refcount.c:28
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 9172 Comm: syz-executor.0 Not tainted 5.4.0-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+0x1fb/0x318 lib/dump_stack.c:118
 panic+0x264/0x7a9 kernel/panic.c:221
 __warn+0x20e/0x210 kernel/panic.c:582
 report_bug+0x1b6/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0xd7/0x440 arch/x86/kernel/traps.c:267
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:refcount_warn_saturate+0x165/0x1b0 lib/refcount.c:28
Code: c7 28 7b c8 88 31 c0 e8 99 1b ba fd 0f 0b eb 83 e8 40 02 e8 fd c6 05 db 3e b1 05 01 48 c7 c7 54 7b c8 88 31 c0 e8 7b 1b ba fd <0f> 0b e9 62 ff ff ff e8 1f 02 e8 fd c6 05 bb 3e b1 05 01 48 c7 c7
RSP: 0018:ffff888087cdfca8 EFLAGS: 00010246
RAX: ef690df9a7bff700 RBX: 0000000000000003 RCX: ffff888098f02200
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff888087cdfcb8 R08: ffffffff815fa274 R09: ffffed1015d465d8
R10: ffffed1015d465d8 R11: 0000000000000000 R12: ffff8880a5cc4b40
R13: dffffc0000000000 R14: 0000000000000003 R15: dffffc0000000000
 refcount_sub_and_test include/linux/refcount.h:261 [inline]
 refcount_dec_and_test include/linux/refcount.h:281 [inline]
 sock_put include/net/sock.h:1728 [inline]
 smc_release+0x37c/0x3f0 net/smc/af_smc.c:202
 __sock_release net/socket.c:591 [inline]
 sock_close+0xe1/0x260 net/socket.c:1269
 __fput+0x2e4/0x740 fs/file_table.c:280
 ____fput+0x15/0x20 fs/file_table.c:313
 task_work_run+0x17e/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:164 [inline]
 prepare_exit_to_usermode+0x483/0x5b0 arch/x86/entry/common.c:195
 syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:278
 do_syscall_64+0x11f/0x1c0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x414211
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffef77f1400 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000414211
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffef77f14e0 R11: 0000000000000293 R12: 000000000075bfc8
R13: 000000000000fc8a R14: 0000000000760458 R15: 000000000075bfd4
Kernel Offset: disabled
Rebooting in 86400 seconds..