------------[ cut here ]------------ refcount_t: increment on 0; use-after-free. WARNING: CPU: 1 PID: 29126 at lib/refcount.c:156 refcount_inc_checked /lib/refcount.c:156 [inline] WARNING: CPU: 1 PID: 29126 at lib/refcount.c:156 refcount_inc_checked+0x61/0x70 /lib/refcount.c:154 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 29126 Comm: syz-executor.5 Not tainted 5.2.0+ #69 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+0x172/0x1f0 /lib/dump_stack.c:113 panic+0x2dc/0x755 /kernel/panic.c:219 __warn.cold+0x20/0x4c /kernel/panic.c:576 report_bug+0x263/0x2b0 /lib/bug.c:186 fixup_bug /arch/x86/kernel/traps.c:179 [inline] fixup_bug /arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 /arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 /arch/x86/kernel/traps.c:291 invalid_op+0x14/0x20 /arch/x86/entry/entry_64.S:1008 RIP: 0010:refcount_inc_checked /lib/refcount.c:156 [inline] RIP: 0010:refcount_inc_checked+0x61/0x70 /lib/refcount.c:154 Code: 1d 9f 8f 64 06 31 ff 89 de e8 9b e1 35 fe 84 db 75 dd e8 52 e0 35 fe 48 c7 c7 80 06 c6 87 c6 05 7f 8f 64 06 01 e8 b7 48 07 fe <0f> 0b eb c1 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41 RSP: 0018:ffff8880ae909bf0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000100 RSI: ffffffff815c3616 RDI: ffffed1015d21370 RBP: ffff8880ae909c00 R08: ffff8880a1e781c0 R09: ffffed1015d240f1 R10: ffffed1015d240f0 R11: ffff8880ae920787 R12: ffff8880a0534b40 R13: ffff8880a0534b28 R14: ffff88804e4d2a88 R15: ffff88804e4d2a60 sock_hold /./include/net/sock.h:649 [inline] sk_add_node /./include/net/sock.h:701 [inline] nr_insert_socket+0x2d/0xe0 /net/netrom/af_netrom.c:137 nr_rx_frame+0x1605/0x1e73 /net/netrom/af_netrom.c:1023 nr_loopback_timer+0x7b/0x170 /net/netrom/nr_loopback.c:59 call_timer_fn+0x1ac/0x780 /kernel/time/timer.c:1322 expire_timers /kernel/time/timer.c:1366 [inline] __run_timers /kernel/time/timer.c:1685 [inline] __run_timers /kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 /kernel/time/timer.c:1698 __do_softirq+0x262/0x98c /kernel/softirq.c:292 invoke_softirq /kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 /kernel/softirq.c:413 exiting_irq /./arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 /arch/x86/kernel/apic/apic.c:1095 apic_timer_interrupt+0xf/0x20 /arch/x86/entry/entry_64.S:828 RIP: 0010:tomoyo_domain_quota_is_ok+0x149/0x540 /security/tomoyo/util.c:1035 Code: 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 0f b6 04 10 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 69 03 00 00 41 0f b6 5c 24 18 <31> ff 89 de e8 3e b4 6c fe 84 db 75 8e e8 f5 b2 6c fe 49 8d 7c 24 RSP: 0018:ffff88806a6574f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000e9ae000 RDX: 0000000000000000 RSI: ffffffff8305cdf7 RDI: ffff88806a05bf98 RBP: ffff88806a657530 R08: ffff8880a1e781c0 R09: ffffed100d4caeb3 R10: ffffed100d4caeb2 R11: 0000000000000000 R12: ffff88806a05bf80 R13: 0000000000000100 R14: 00000000000001d0 R15: 0000000000000000 tomoyo_supervisor+0x2e8/0xef0 /security/tomoyo/common.c:2087 tomoyo_audit_path_log /security/tomoyo/file.c:168 [inline] tomoyo_path_permission /security/tomoyo/file.c:587 [inline] tomoyo_path_permission+0x263/0x360 /security/tomoyo/file.c:573 tomoyo_check_open_permission+0x372/0x3f0 /security/tomoyo/file.c:780 tomoyo_file_open /security/tomoyo/tomoyo.c:319 [inline] tomoyo_file_open+0xa9/0xd0 /security/tomoyo/tomoyo.c:314 security_file_open+0x71/0x300 /security/security.c:1457 do_dentry_open+0x373/0x1250 /fs/open.c:765 vfs_open+0xa0/0xd0 /fs/open.c:887 do_last /fs/namei.c:3416 [inline] path_openat+0x10e9/0x4630 /fs/namei.c:3533 do_filp_open+0x1a1/0x280 /fs/namei.c:3563 do_sys_open+0x3fe/0x5d0 /fs/open.c:1070 __do_sys_open /fs/open.c:1088 [inline] __se_sys_open /fs/open.c:1083 [inline] __x64_sys_open+0x7e/0xc0 /fs/open.c:1083 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413701 Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 0a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f66322e7bb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000413701 RDX: 00007f66322e7be6 RSI: 0000000000000002 RDI: 00007f66322e7bd0 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000016 R10: 0000000000000004 R11: 0000000000000293 R12: 00007f66322e86d4 R13: 00000000004c8cb2 R14: 00000000004dfa00 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..