[ 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 '10.128.0.213' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 28.341436] kasan: CONFIG_KASAN_INLINE enabled [ 28.346100] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.353756] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.359973] Modules linked in: [ 28.363152] CPU: 1 PID: 8002 Comm: syz-executor527 Not tainted 4.14.206-syzkaller #0 [ 28.371023] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.380370] task: ffff88809b446280 task.stack: ffff8880b32d8000 [ 28.386405] RIP: 0010:rb_erase+0x29/0x1290 [ 28.390629] RSP: 0018:ffff8880b32dfa68 EFLAGS: 00010292 [ 28.395963] RAX: dffffc0000000000 RBX: ffff88808c0247f0 RCX: 1ffff1101665bf27 [ 28.403206] RDX: 0000000000000001 RSI: ffffffff8bf90da0 RDI: 0000000000000008 [ 28.410446] RBP: 0000000000000000 R08: ffffffff8ba2402c R09: 0000000000001c90 [ 28.417689] R10: 0000000000000001 R11: ffff88809b446280 R12: 0000000000000000 [ 28.424932] R13: dffffc0000000000 R14: ffff88808c0258b8 R15: ffffffff8bf90da0 [ 28.432185] FS: 00000000019e6880(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 28.440395] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.453903] CR2: 0000000020000004 CR3: 00000000a1bfa000 CR4: 00000000001406e0 [ 28.461158] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.468412] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.475661] Call Trace: [ 28.478244] integrity_inode_free+0x119/0x300 [ 28.482725] security_inode_free+0x14/0x80 [ 28.486945] __destroy_inode+0x1e8/0x4d0 [ 28.490979] destroy_inode+0x49/0x110 [ 28.494748] iput+0x458/0x7e0 [ 28.497828] ? ext4_mark_dquot_dirty+0x190/0x190 [ 28.502642] ext4_ioctl+0x16c5/0x3870 [ 28.506416] ? ext4_ioctl_check_immutable+0x1c0/0x1c0 [ 28.511576] ? putname+0xcd/0x110 [ 28.515019] ? do_sys_open+0x203/0x410 [ 28.518880] ? do_syscall_64+0x1d5/0x640 [ 28.522911] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.528246] ? path_lookupat+0x780/0x780 [ 28.532285] ? debug_check_no_obj_freed+0x2c0/0x674 [ 28.537277] ? lock_acquire+0x170/0x3f0 [ 28.541223] ? lock_downgrade+0x740/0x740 [ 28.545346] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 28.550438] ? debug_check_no_obj_freed+0x2c0/0x674 [ 28.555437] ? ext4_ioctl_check_immutable+0x1c0/0x1c0 [ 28.560599] do_vfs_ioctl+0x75a/0xff0 [ 28.564392] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 28.569814] ? ioctl_preallocate+0x1a0/0x1a0 [ 28.574194] ? kmem_cache_free+0x23a/0x2b0 [ 28.578399] ? putname+0xcd/0x110 [ 28.581833] ? do_sys_open+0x208/0x410 [ 28.585689] ? filp_open+0x60/0x60 [ 28.589201] ? security_file_ioctl+0x83/0xb0 [ 28.593589] SyS_ioctl+0x7f/0xb0 [ 28.596926] ? do_vfs_ioctl+0xff0/0xff0 [ 28.600872] do_syscall_64+0x1d5/0x640 [ 28.604736] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.609896] RIP: 0033:0x440249 [ 28.613070] RSP: 002b:00007ffcf786b848 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 28.620763] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440249 [ 28.628017] RDX: 0000000000000000 RSI: 0000000000006611 RDI: 0000000000000003 [ 28.635259] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 28.642513] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a50 [ 28.649755] R13: 0000000000401ae0 R14: 0000000000000000 R15: 0000000000000000 [ 28.656999] 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 [ 28.676056] RIP: rb_erase+0x29/0x1290 RSP: ffff8880b32dfa68 [ 28.681836] ---[ end trace f0475f107ddd4b67 ]--- [ 28.686579] Kernel panic - not syncing: Fatal exception [ 28.692626] Kernel Offset: disabled [ 28.696235] Rebooting in 86400 seconds..