[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.104' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 29.079527] kasan: CONFIG_KASAN_INLINE enabled [ 29.084380] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.091975] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.098273] Modules linked in: [ 29.101483] CPU: 1 PID: 7964 Comm: syz-executor969 Not tainted 4.14.234-syzkaller #0 [ 29.109350] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.118691] task: ffff8880b49a0300 task.stack: ffff888092780000 [ 29.124743] RIP: 0010:rb_erase+0x29/0x1290 [ 29.129005] RSP: 0018:ffff888092787a68 EFLAGS: 00010292 [ 29.134371] RAX: dffffc0000000000 RBX: ffff88808e8c3930 RCX: 1ffff110124f0f27 [ 29.141631] RDX: 0000000000000001 RSI: ffffffff8bf9aea0 RDI: 0000000000000008 [ 29.148883] RBP: 0000000000000000 R08: ffffffff8ba2e17c R09: 0000000000001bfc [ 29.156233] R10: 0000000000000001 R11: ffff8880b49a0300 R12: 0000000000000000 [ 29.163536] R13: dffffc0000000000 R14: ffff88808e937838 R15: ffffffff8bf9aea0 [ 29.170831] FS: 00000000005b1300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 29.179145] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.185099] CR2: 0000000020002000 CR3: 00000000aad61000 CR4: 00000000001406e0 [ 29.192356] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.199609] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.206852] Call Trace: [ 29.209428] integrity_inode_free+0x119/0x300 [ 29.213960] security_inode_free+0x14/0x80 [ 29.218336] __destroy_inode+0x1e8/0x4d0 [ 29.222379] destroy_inode+0x49/0x110 [ 29.226165] iput+0x458/0x7e0 [ 29.229247] ? ext4_mark_dquot_dirty+0x190/0x190 [ 29.234028] ext4_ioctl+0x16c5/0x3870 [ 29.237807] ? ext4_ioctl_check_immutable+0x1c0/0x1c0 [ 29.242976] ? putname+0xcd/0x110 [ 29.246404] ? do_sys_open+0x203/0x410 [ 29.250292] ? do_syscall_64+0x1d5/0x640 [ 29.254340] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 29.259695] ? path_lookupat+0x780/0x780 [ 29.263741] ? debug_check_no_obj_freed+0x2c0/0x680 [ 29.268740] ? lock_acquire+0x170/0x3f0 [ 29.272698] ? lock_downgrade+0x740/0x740 [ 29.276823] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 29.281904] ? debug_check_no_obj_freed+0x2c0/0x680 [ 29.286918] ? ext4_ioctl_check_immutable+0x1c0/0x1c0 [ 29.292173] do_vfs_ioctl+0x75a/0xff0 [ 29.295955] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 29.301392] ? ioctl_preallocate+0x1a0/0x1a0 [ 29.305812] ? kmem_cache_free+0x23a/0x2b0 [ 29.310032] ? putname+0xcd/0x110 [ 29.313470] ? do_sys_open+0x208/0x410 [ 29.317337] ? filp_open+0x60/0x60 [ 29.320919] ? security_file_ioctl+0x83/0xb0 [ 29.325306] SyS_ioctl+0x7f/0xb0 [ 29.328664] ? do_vfs_ioctl+0xff0/0xff0 [ 29.332619] do_syscall_64+0x1d5/0x640 [ 29.336497] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 29.341691] RIP: 0033:0x43ee79 [ 29.344950] RSP: 002b:00007ffd7acc8b18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 29.352770] RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ee79 [ 29.360035] RDX: 0000000000000000 RSI: 0000000000006611 RDI: 0000000000000004 [ 29.367308] RBP: 0000000000402e60 R08: 0000000000000000 R09: 0000000000400488 [ 29.374914] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402ef0 [ 29.382163] R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488 [ 29.389415] Code: ff ff 48 b8 00 00 00 00 00 fc ff df 41 57 49 89 f7 41 56 41 55 41 54 49 89 fc 48 83 c7 08 48 89 fa 55 48 c1 ea 03 53 48 83 ec 18 <80> 3c 02 00 0f 85 f2 0c 00 00 49 8d 7c 24 10 4d 8b 74 24 08 48 [ 29.409381] RIP: rb_erase+0x29/0x1290 RSP: ffff888092787a68 [ 29.415215] ---[ end trace 7019bb2035a31616 ]--- [ 29.419979] Kernel panic - not syncing: Fatal exception [ 29.425993] Kernel Offset: disabled [ 29.429607] Rebooting in 86400 seconds..