[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.231' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 29.834987] kasan: CONFIG_KASAN_INLINE enabled [ 29.839663] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.847427] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.853661] Modules linked in: [ 29.856845] CPU: 1 PID: 7997 Comm: syz-executor087 Not tainted 4.14.216-syzkaller #0 [ 29.864714] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.874061] task: ffff8880a9674480 task.stack: ffff8880b4578000 [ 29.880107] RIP: 0010:rb_erase+0x29/0x1290 [ 29.884336] RSP: 0018:ffff8880b457fa68 EFLAGS: 00010292 [ 29.889686] RAX: dffffc0000000000 RBX: ffff88808edc77b0 RCX: 1ffff110168aff27 [ 29.896939] RDX: 0000000000000001 RSI: ffffffff8bf93da0 RDI: 0000000000000008 [ 29.904205] RBP: 0000000000000000 R08: ffffffff8ba2717c R09: 0000000000001c78 [ 29.911458] R10: 0000000000000001 R11: ffff8880a9674480 R12: 0000000000000000 [ 29.918707] R13: dffffc0000000000 R14: ffff88808ee09878 R15: ffffffff8bf93da0 [ 29.925972] FS: 0000000002287880(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 29.934179] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.940040] CR2: 0000000020000244 CR3: 0000000096903000 CR4: 00000000001406e0 [ 29.947287] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.954533] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.961779] Call Trace: [ 29.964366] integrity_inode_free+0x119/0x300 [ 29.968841] security_inode_free+0x14/0x80 [ 29.973064] __destroy_inode+0x1e8/0x4d0 [ 29.977119] destroy_inode+0x49/0x110 [ 29.980895] iput+0x458/0x7e0 [ 29.983981] ? ext4_mark_dquot_dirty+0x190/0x190 [ 29.988715] ext4_ioctl+0x16c5/0x3870 [ 29.992511] ? ext4_ioctl_check_immutable+0x1c0/0x1c0 [ 29.997676] ? putname+0xcd/0x110 [ 30.001105] ? do_sys_open+0x203/0x410 [ 30.004969] ? do_syscall_64+0x1d5/0x640 [ 30.009016] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 30.014377] ? path_lookupat+0x780/0x780 [ 30.018433] ? debug_check_no_obj_freed+0x2c0/0x680 [ 30.023430] ? lock_acquire+0x170/0x3f0 [ 30.027386] ? lock_downgrade+0x740/0x740 [ 30.031537] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 30.036902] ? debug_check_no_obj_freed+0x2c0/0x680 [ 30.042127] ? ext4_ioctl_check_immutable+0x1c0/0x1c0 [ 30.047333] do_vfs_ioctl+0x75a/0xff0 [ 30.051143] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 30.056604] ? ioctl_preallocate+0x1a0/0x1a0 [ 30.061011] ? kmem_cache_free+0x23a/0x2b0 [ 30.065339] ? putname+0xcd/0x110 [ 30.068780] ? do_sys_open+0x208/0x410 [ 30.072911] ? filp_open+0x60/0x60 [ 30.076438] ? security_file_ioctl+0x83/0xb0 [ 30.080832] SyS_ioctl+0x7f/0xb0 [ 30.084191] ? do_vfs_ioctl+0xff0/0xff0 [ 30.088145] do_syscall_64+0x1d5/0x640 [ 30.092032] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 30.097199] RIP: 0033:0x440219 [ 30.100364] RSP: 002b:00007ffe60f99a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 30.108093] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219 [ 30.115347] RDX: 0000000000000000 RSI: 0000000000006611 RDI: 0000000000000003 [ 30.122651] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 30.129922] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a20 [ 30.137186] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 30.144451] 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 [ 30.163525] RIP: rb_erase+0x29/0x1290 RSP: ffff8880b457fa68 [ 30.169339] ---[ end trace d046e2529c721201 ]--- [ 30.174250] Kernel panic - not syncing: Fatal exception [ 30.180042] Kernel Offset: disabled [ 30.183665] Rebooting in 86400 seconds..