[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.757053] audit: type=1800 audit(1538574559.679:25): pid=5675 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 36.788627] audit: type=1800 audit(1538574559.679:26): pid=5675 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 36.831295] audit: type=1800 audit(1538574559.689:27): pid=5675 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 '10.128.0.68' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 45.644140] kasan: CONFIG_KASAN_INLINE enabled [ 45.648763] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 45.656185] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 45.662443] CPU: 1 PID: 5828 Comm: syz-executor374 Not tainted 4.19.0-rc5+ #125 [ 45.669874] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.679228] RIP: 0010:rb_erase+0x306/0x3710 [ 45.683540] 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 [ 45.702433] RSP: 0018:ffff8801bbe0e918 EFLAGS: 00010202 [ 45.707786] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 45.715045] RDX: 1ffff100377c1d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 45.722306] RBP: ffff8801bbe0f320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 45.729567] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b8f561f0 [ 45.736829] R13: dffffc0000000000 R14: ffff8801bbe0f2f8 R15: ffff8801bbe0f438 [ 45.744090] FS: 0000000002450880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 45.752305] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.758192] CR2: 0000000020000080 CR3: 00000001d8e77000 CR4: 00000000001406e0 [ 45.765455] Call Trace: [ 45.768038] ? rb_insert_color+0x1460/0x1460 [ 45.772449] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 45.777376] ? lock_downgrade+0x900/0x900 [ 45.781519] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 45.787313] ? mark_held_locks+0x130/0x130 [ 45.791545] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 45.796819] ? rcu_bh_qs+0xc0/0xc0 [ 45.800352] ? unwind_dump+0x190/0x190 [ 45.804236] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.809776] ? mark_held_locks+0x130/0x130 [ 45.814004] ? mark_page_accessed+0xcb0/0x2040 [ 45.818571] ? activate_page+0x1040/0x1040 [ 45.822817] ? activate_page+0x1040/0x1040 [ 45.827052] ? mark_held_locks+0x130/0x130 [ 45.831283] ? kasan_kmalloc+0xc7/0xe0 [ 45.835171] ? kmem_cache_alloc_trace+0x152/0x750 [ 45.840004] ? ima_add_digest_entry+0xcb/0x6a0 [ 45.844574] ? ima_add_template_entry+0x466/0x7f0 [ 45.849410] ? ima_store_template+0x224/0x310 [ 45.853914] ? pagecache_get_page+0x2d8/0xf00 [ 45.858406] ? find_get_pages_contig+0x15b0/0x15b0 [ 45.863349] ? is_bpf_text_address+0xac/0x170 [ 45.867836] ? lock_downgrade+0x900/0x900 [ 45.871984] ? mark_held_locks+0x130/0x130 [ 45.876214] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 45.882008] ? mark_held_locks+0x130/0x130 [ 45.886235] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 45.891591] ? lock_downgrade+0x900/0x900 [ 45.895732] ? kasan_check_read+0x11/0x20 [ 45.899873] ? do_raw_spin_unlock+0xa7/0x2f0 [ 45.904290] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 45.908867] ? mark_held_locks+0x130/0x130 [ 45.913097] ? _raw_spin_unlock+0x2c/0x50 [ 45.917234] ? ext4_discard_preallocations+0x18a/0x13c0 [ 45.922590] ? trace_hardirqs_on+0xbd/0x310 [ 45.926899] ? ext4_exit_mballoc+0xc0/0xc0 [ 45.931123] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.936148] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 45.940896] ? modules_open+0xa0/0xa0 [ 45.944685] ? __es_tree_search.isra.12+0x1ba/0x220 [ 45.949688] ? __es_remove_extent+0x9a3/0xba0 [ 45.954190] ? mark_held_locks+0x130/0x130 [ 45.958407] ? lock_downgrade+0x900/0x900 [ 45.962552] ? ext4_es_scan+0x960/0x960 [ 45.966510] ? lock_release+0x970/0x970 [ 45.970470] ? trace_hardirqs_on+0xbd/0x310 [ 45.974782] ? kasan_check_read+0x11/0x20 [ 45.978912] ? clear_inode+0x114/0x3a0 [ 45.982797] ? do_raw_write_trylock+0x1c0/0x1c0 [ 45.987462] ? kasan_check_write+0x14/0x20 [ 45.991695] ? lock_acquire+0x1ed/0x520 [ 45.995668] ? integrity_inode_free+0x77/0x320 [ 46.000235] ? ext4_es_remove_extent+0x151/0x500 [ 46.004985] ? lock_release+0x970/0x970 [ 46.008946] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 46.014044] ? depot_save_stack+0x292/0x470 [ 46.018357] ? kasan_check_write+0x14/0x20 [ 46.022586] ? do_raw_write_lock+0xbd/0x1b0 [ 46.026904] integrity_inode_free+0x12f/0x320 [ 46.031418] security_inode_free+0x19/0x90 [ 46.035654] __destroy_inode+0x328/0x820 [ 46.039710] ? generic_update_time+0x450/0x450 [ 46.044287] ? evict+0x5d8/0x980 [ 46.047650] ? lock_downgrade+0x900/0x900 [ 46.051812] ? __inode_wait_for_writeback+0x2cf/0x380 [ 46.057011] destroy_inode+0xda/0x200 [ 46.060821] ? __destroy_inode+0x820/0x820 [ 46.065054] ? kasan_check_write+0x14/0x20 [ 46.069283] ? do_raw_spin_lock+0xc1/0x200 [ 46.073544] evict+0x5e0/0x980 [ 46.076737] ? jbd2_journal_stop+0x430/0x15d0 [ 46.081236] ? destroy_inode+0x200/0x200 [ 46.085296] ? do_raw_spin_lock+0xc1/0x200 [ 46.089545] ? iput+0x671/0xa90 [ 46.092999] ? lock_downgrade+0x900/0x900 [ 46.097144] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 46.102680] ? kasan_check_read+0x11/0x20 [ 46.106832] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 46.111442] ? lock_downgrade+0x900/0x900 [ 46.115589] ? ext4_ioctl+0x231b/0x4210 [ 46.119559] iput+0x679/0xa90 [ 46.122662] ? inode_add_lru+0x2a0/0x2a0 [ 46.126718] ? up_write+0x7b/0x220 [ 46.130256] ? up_read+0x110/0x110 [ 46.133789] ? up_read+0x110/0x110 [ 46.137323] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.142854] ? check_preemption_disabled+0x48/0x200 [ 46.147864] ext4_ioctl+0x236f/0x4210 [ 46.151670] ? is_bpf_text_address+0xac/0x170 [ 46.156171] ? ext4_ioctl_group_add+0x560/0x560 [ 46.160829] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 46.166631] ? kasan_check_read+0x11/0x20 [ 46.170769] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 46.176031] ? rcu_bh_qs+0xc0/0xc0 [ 46.179552] ? unwind_dump+0x190/0x190 [ 46.183427] ? is_bpf_text_address+0xd3/0x170 [ 46.187905] ? kernel_text_address+0x79/0xf0 [ 46.192302] ? __kernel_text_address+0xd/0x40 [ 46.196797] ? unwind_get_return_address+0x61/0xa0 [ 46.201719] ? __save_stack_trace+0x8d/0xf0 [ 46.206034] ? save_stack+0xa9/0xd0 [ 46.209645] ? save_stack+0x43/0xd0 [ 46.213259] ? __kasan_slab_free+0x102/0x150 [ 46.217649] ? kasan_slab_free+0xe/0x10 [ 46.221619] ? kmem_cache_free+0x83/0x290 [ 46.225765] ? putname+0xf2/0x130 [ 46.229218] ? do_sys_open+0x54d/0x700 [ 46.233091] ? __x64_sys_openat+0x9d/0x100 [ 46.237313] ? do_syscall_64+0x1b9/0x820 [ 46.241360] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.246713] ? trace_hardirqs_off+0xb8/0x310 [ 46.251108] ? kasan_check_read+0x11/0x20 [ 46.255248] ? do_raw_spin_unlock+0xa7/0x2f0 [ 46.259644] ? trace_hardirqs_on+0x310/0x310 [ 46.264039] ? kasan_check_write+0x14/0x20 [ 46.268264] ? trace_hardirqs_off+0xb8/0x310 [ 46.272659] ? trace_hardirqs_on+0x310/0x310 [ 46.277052] ? ext4_ioctl_group_add+0x560/0x560 [ 46.281733] do_vfs_ioctl+0x1de/0x1720 [ 46.285618] ? trace_hardirqs_on+0xbd/0x310 [ 46.289930] ? ioctl_preallocate+0x300/0x300 [ 46.294324] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.299846] ? __fget_light+0x2e9/0x430 [ 46.303809] ? fget_raw+0x20/0x20 [ 46.307245] ? putname+0xf2/0x130 [ 46.310684] ? kmem_cache_free+0x21a/0x290 [ 46.314910] ? putname+0xf7/0x130 [ 46.318358] ? security_file_ioctl+0x94/0xc0 [ 46.322762] ksys_ioctl+0xa9/0xd0 [ 46.326204] __x64_sys_ioctl+0x73/0xb0 [ 46.330077] do_syscall_64+0x1b9/0x820 [ 46.333975] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 46.339327] ? syscall_return_slowpath+0x5e0/0x5e0 [ 46.344248] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.349080] ? trace_hardirqs_on_caller+0x310/0x310 [ 46.354081] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 46.359092] ? prepare_exit_to_usermode+0x291/0x3b0 [ 46.364099] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.368931] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.374104] RIP: 0033:0x440009 [ 46.377283] 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 [ 46.396172] RSP: 002b:00007ffe33bfa888 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 46.403886] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 46.411158] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 46.418419] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 46.425679] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 46.432940] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 46.440209] Modules linked in: [ 46.443536] ---[ end trace 52f8229689e25308 ]--- [ 46.448329] RIP: 0010:rb_erase+0x306/0x3710 [ 46.452718] 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 [ 46.471738] RSP: 0018:ffff8801bbe0e918 EFLAGS: 00010202 [ 46.477119] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 46.484562] RDX: 1ffff100377c1d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 46.491876] RBP: ffff8801bbe0f320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 46.499158] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b8f561f0 [ 46.506472] R13: dffffc0000000000 R14: ffff8801bbe0f2f8 R15: ffff8801bbe0f438 [ 46.513788] FS: 0000000002450880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 46.522056] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.527944] CR2: 0000000020000080 CR3: 00000001d8e77000 CR4: 00000000001406e0 [ 46.535256] Kernel panic - not syncing: Fatal exception [ 46.541558] Kernel Offset: disabled [ 46.545188] Rebooting in 86400 seconds..