------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 1 PID: 15540 at lib/refcount.c:156 refcount_inc_checked+0x2b/0x30 lib/refcount.c:156
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 15540 Comm: syz-executor.0 Not tainted 5.2.0+ #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:219
 __warn.cold.10+0x1b/0x37 kernel/panic.c:576
 report_bug+0x1a4/0x200 lib/bug.c:186
 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+0x14/0x20 arch/x86/entry/entry_64.S:1008
RIP: 0010:refcount_inc_checked+0x2b/0x30 lib/refcount.c:156
Code: 48 89 e5 e8 97 fe ff ff 84 c0 74 02 5d c3 80 3d b8 4e f3 05 00 75 f5 48 c7 c7 60 5f 42 87 c6 05 a8 4e f3 05 01 e8 07 aa 3a fe <0f> 0b 5d c3 90 55 48 89 e5 41 56 41 55 49 89 fd 48 c7 c7 c0 5f 42
RSP: 0018:ffff888079037c60 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff8880a96e2dc0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff89d98140
RBP: ffff888079037c60 R08: ffffed1015d660b1 R09: ffffed1015d660b1
R10: ffffed1015d660b0 R11: ffff8880aeb30587 R12: 0000000000000001
R13: ffff888093d586c0 R14: ffff888079037d38 R15: ffffffff88695f80
 __key_get include/linux/key.h:281 [inline]
 find_key_to_update+0x67/0x80 security/keys/keyring.c:1127
 key_create_or_update+0x4e5/0xb20 security/keys/key.c:905
 __do_sys_add_key security/keys/keyctl.c:132 [inline]
 __se_sys_add_key security/keys/keyctl.c:72 [inline]
 __x64_sys_add_key+0x219/0x3f0 security/keys/keyctl.c:72
 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296
 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:00007f2424413c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459a59
RDX: 0000000020000440 RSI: 0000000020000000 RDI: 0000000020000040
RBP: 000000000075bf20 R08: fffffffffffffffe R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 00007f24244146d4
R13: 00000000004bfab8 R14: 00000000004d1ad8 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..