[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 33.037960] audit: type=1800 audit(1538347306.670:25): pid=5870 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 33.063648] audit: type=1800 audit(1538347306.670:26): pid=5870 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 33.084195] audit: type=1800 audit(1538347306.670:27): pid=5870 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.487497] kasan: CONFIG_KASAN_INLINE enabled [ 48.492097] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 48.499682] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 48.505917] CPU: 1 PID: 6026 Comm: syz-executor362 Not tainted 4.19.0-rc5-next-20180928+ #84 [ 48.514471] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.523817] RIP: 0010:rb_erase+0x306/0x3710 [ 48.528124] Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9 65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00 0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00 [ 48.547012] RSP: 0018:ffff8801d7516918 EFLAGS: 00010202 [ 48.552358] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 48.559608] RDX: 1ffff1003aea2d2b RSI: ffffffff8afa83c0 RDI: 0000000000000008 [ 48.566860] RBP: ffff8801d7517320 R08: dffffc0000000000 R09: fffffbfff12d6fb8 [ 48.574116] R10: fffffbfff12d6fb8 R11: ffffffff896b7dc3 R12: ffff8801b8e6f970 [ 48.581367] R13: dffffc0000000000 R14: ffff8801d75172f8 R15: ffff8801d7517438 [ 48.588622] FS: 00000000019c8880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 48.596829] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.602691] CR2: 0000000020000080 CR3: 00000001d7a0e000 CR4: 00000000001406e0 [ 48.609948] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.617201] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.624453] Call Trace: [ 48.627023] ? find_get_entry+0x2f2/0xc40 [ 48.631160] ? rb_insert_color+0x1460/0x1460 [ 48.635553] ? add_to_page_cache_lru+0xdb0/0xdb0 [ 48.640294] ? is_bpf_text_address+0xac/0x170 [ 48.644777] ? lock_downgrade+0x900/0x900 [ 48.648907] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 48.653821] ? mark_held_locks+0x130/0x130 [ 48.658265] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 48.663527] ? rcu_softirq_qs+0x20/0x20 [ 48.667484] ? unwind_dump+0x190/0x190 [ 48.671370] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.676898] ? mark_page_accessed+0xcaf/0x2040 [ 48.681471] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.686997] ? activate_page+0x1040/0x1040 [ 48.691219] ? mark_held_locks+0x130/0x130 [ 48.695440] ? unwind_get_return_address+0x61/0xa0 [ 48.700357] ? __save_stack_trace+0x8d/0xf0 [ 48.704671] ? pagecache_get_page+0x2d8/0xf00 [ 48.709150] ? process_measurement+0x15c4/0x1bf0 [ 48.713903] ? mark_held_locks+0x130/0x130 [ 48.718131] ? find_get_pages_contig+0x15b0/0x15b0 [ 48.723047] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 48.728053] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 48.732802] ? mark_held_locks+0x130/0x130 [ 48.737021] ? lock_downgrade+0x900/0x900 [ 48.741155] ? mark_held_locks+0x130/0x130 [ 48.745394] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 48.750310] ? mark_held_locks+0x130/0x130 [ 48.754539] ? ext4_discard_preallocations+0x9b4/0x13b0 [ 48.759894] ? lock_downgrade+0x900/0x900 [ 48.764049] ? kasan_check_read+0x11/0x20 [ 48.768195] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.772586] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.777154] ? mark_held_locks+0x130/0x130 [ 48.781374] ? _raw_spin_unlock+0x2c/0x50 [ 48.785512] ? ext4_discard_preallocations+0x18a/0x13b0 [ 48.790867] ? __getblk_gfp+0x102/0x1040 [ 48.794916] ? ext4_exit_mballoc+0xc0/0xc0 [ 48.799136] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 48.804140] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 48.808939] ? modules_open+0xa0/0xa0 [ 48.812733] ? __es_tree_search.isra.12+0x1ba/0x220 [ 48.817733] ? __es_remove_extent+0x9a3/0xba0 [ 48.822214] ? mark_held_locks+0x130/0x130 [ 48.826435] ? lock_downgrade+0x900/0x900 [ 48.830564] ? ext4_es_scan+0x950/0x950 [ 48.834523] ? lock_release+0x970/0x970 [ 48.838488] ? trace_hardirqs_on+0xbd/0x310 [ 48.842794] ? kasan_check_read+0x11/0x20 [ 48.846927] ? clear_inode+0x114/0x3a0 [ 48.850799] ? do_raw_write_trylock+0x1c0/0x1c0 [ 48.855453] ? kasan_check_write+0x14/0x20 [ 48.859671] ? lock_acquire+0x1ed/0x520 [ 48.863627] ? integrity_inode_free+0x77/0x320 [ 48.868195] ? ext4_es_remove_extent+0x14c/0x4f0 [ 48.872934] ? lock_release+0x970/0x970 [ 48.876896] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 48.881983] ? depot_save_stack+0x292/0x470 [ 48.886294] ? kasan_check_write+0x14/0x20 [ 48.890513] ? do_raw_write_lock+0xbd/0x1b0 [ 48.894822] integrity_inode_free+0x12f/0x320 [ 48.899304] security_inode_free+0x19/0x90 [ 48.903523] __destroy_inode+0x328/0x820 [ 48.907570] ? generic_update_time+0x450/0x450 [ 48.912134] ? evict+0x5d8/0x980 [ 48.915492] ? lock_downgrade+0x900/0x900 [ 48.919767] ? __inode_wait_for_writeback+0x2cf/0x380 [ 48.924946] destroy_inode+0xda/0x200 [ 48.928733] ? __destroy_inode+0x820/0x820 [ 48.932960] ? kasan_check_write+0x14/0x20 [ 48.937182] ? do_raw_spin_lock+0xc1/0x200 [ 48.941524] evict+0x5e0/0x980 [ 48.944710] ? jbd2_journal_stop+0x430/0x15c0 [ 48.949187] ? destroy_inode+0x200/0x200 [ 48.953358] ? do_raw_spin_lock+0xc1/0x200 [ 48.957578] ? iput+0x66c/0xa90 [ 48.960842] ? lock_downgrade+0x900/0x900 [ 48.964978] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.970499] ? kasan_check_read+0x11/0x20 [ 48.974640] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.979352] ? lock_downgrade+0x900/0x900 [ 48.983495] ? ext4_ioctl+0x2316/0x4210 [ 48.987500] iput+0x674/0xa90 [ 48.990600] ? inode_add_lru+0x2a0/0x2a0 [ 48.994644] ? up_write+0x7b/0x220 [ 48.998165] ? down_write_nested+0x130/0x130 [ 49.002555] ? down_write_nested+0x130/0x130 [ 49.006950] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.012470] ? check_preemption_disabled+0x48/0x200 [ 49.017472] ext4_ioctl+0x236a/0x4210 [ 49.021260] ? is_bpf_text_address+0xac/0x170 [ 49.025738] ? ext4_ioctl_group_add+0x560/0x560 [ 49.030390] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 49.035302] ? kasan_check_read+0x11/0x20 [ 49.039431] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 49.044692] ? rcu_softirq_qs+0x20/0x20 [ 49.048647] ? unwind_dump+0x190/0x190 [ 49.052518] ? is_bpf_text_address+0xd3/0x170 [ 49.057002] ? kernel_text_address+0x79/0xf0 [ 49.061396] ? __kernel_text_address+0xd/0x40 [ 49.065947] ? unwind_get_return_address+0x61/0xa0 [ 49.070869] ? __save_stack_trace+0x8d/0xf0 [ 49.075183] ? save_stack+0xa9/0xd0 [ 49.078795] ? save_stack+0x43/0xd0 [ 49.082404] ? __kasan_slab_free+0x102/0x150 [ 49.086796] ? kasan_slab_free+0xe/0x10 [ 49.090754] ? kmem_cache_free+0x83/0x290 [ 49.095017] ? putname+0xf2/0x130 [ 49.098454] ? do_sys_open+0x54d/0x700 [ 49.102337] ? __x64_sys_openat+0x9d/0x100 [ 49.106687] ? do_syscall_64+0x1b9/0x820 [ 49.110783] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.116140] ? trace_hardirqs_off+0xb8/0x310 [ 49.120532] ? kasan_check_read+0x11/0x20 [ 49.124667] ? do_raw_spin_unlock+0xa7/0x2f0 [ 49.129062] ? trace_hardirqs_on+0x310/0x310 [ 49.133469] ? kasan_check_write+0x14/0x20 [ 49.137695] ? trace_hardirqs_off+0xb8/0x310 [ 49.142096] ? trace_hardirqs_on+0x310/0x310 [ 49.146493] ? ext4_ioctl_group_add+0x560/0x560 [ 49.151150] do_vfs_ioctl+0x1de/0x1720 [ 49.155024] ? trace_hardirqs_on+0xbd/0x310 [ 49.159340] ? ioctl_preallocate+0x300/0x300 [ 49.163733] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.169256] ? __fget_light+0x2e9/0x430 [ 49.173210] ? fget_raw+0x20/0x20 [ 49.176649] ? putname+0xf2/0x130 [ 49.180167] ? kmem_cache_free+0x21a/0x290 [ 49.184491] ? putname+0xf7/0x130 [ 49.187940] ? security_file_ioctl+0x94/0xc0 [ 49.192337] ksys_ioctl+0xa9/0xd0 [ 49.195775] __x64_sys_ioctl+0x73/0xb0 [ 49.199649] do_syscall_64+0x1b9/0x820 [ 49.203564] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 49.208922] ? syscall_return_slowpath+0x5e0/0x5e0 [ 49.213837] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.218667] ? trace_hardirqs_on_caller+0x310/0x310 [ 49.223670] ? prepare_exit_to_usermode+0x291/0x3b0 [ 49.228676] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.233505] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.238757] RIP: 0033:0x440019 [ 49.241941] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 49.260943] RSP: 002b:00007ffcbc5bbbb8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 49.268635] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440019 [ 49.275892] RDX: 0000000000440019 RSI: 0000000000006611 RDI: 0000000000000003 [ 49.283142] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 49.290396] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018a0 [ 49.297650] R13: 0000000000401930 R14: 0000000000000000 R15: 0000000000000000 [ 49.304908] Modules linked in: [ 49.308145] ---[ end trace a49cfcb54d7c8925 ]--- [ 49.312906] RIP: 0010:rb_erase+0x306/0x3710 [ 49.317247] Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9 65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00 0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00 [ 49.336187] RSP: 0018:ffff8801d7516918 EFLAGS: 00010202 [ 49.341540] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.348832] RDX: 1ffff1003aea2d2b RSI: ffffffff8afa83c0 RDI: 0000000000000008 [ 49.356123] RBP: ffff8801d7517320 R08: dffffc0000000000 R09: fffffbfff12d6fb8 [ 49.363381] R10: fffffbfff12d6fb8 R11: ffffffff896b7dc3 R12: ffff8801b8e6f970 [ 49.370679] R13: dffffc0000000000 R14: ffff8801d75172f8 R15: ffff8801d7517438 [ 49.377972] FS: 00000000019c8880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 49.386217] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.392095] CR2: 0000000020000080 CR3: 00000001d7a0e000 CR4: 00000000001406e0 [ 49.399396] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.406683] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.413969] Kernel panic - not syncing: Fatal exception [ 49.420326] Kernel Offset: disabled [ 49.424027] Rebooting in 86400 seconds..