[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.843504] audit: type=1800 audit(1538152371.269:25): 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 [ 36.869193] audit: type=1800 audit(1538152371.269:26): 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 [ 36.897863] audit: type=1800 audit(1538152371.269:27): 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 '10.128.0.48' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.153211] kasan: CONFIG_KASAN_INLINE enabled [ 48.157803] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 48.165193] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 48.171437] CPU: 0 PID: 5829 Comm: syz-executor436 Not tainted 4.19.0-rc5+ #120 [ 48.178876] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.188219] RIP: 0010:rb_erase+0x306/0x3710 [ 48.192523] 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 [ 48.211418] RSP: 0018:ffff8801d7cfe918 EFLAGS: 00010202 [ 48.216777] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 48.224348] RDX: 1ffff1003af9fd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 48.231611] RBP: ffff8801d7cff320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 48.238863] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b925b1f0 [ 48.246111] R13: dffffc0000000000 R14: ffff8801d7cff2f8 R15: ffff8801d7cff438 [ 48.253362] FS: 0000000001b90880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 48.261568] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.267434] CR2: 0000000020000080 CR3: 00000001d8c06000 CR4: 00000000001406f0 [ 48.274687] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.281936] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.289181] Call Trace: [ 48.291758] ? rb_insert_color+0x1460/0x1460 [ 48.296155] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 48.301065] ? lock_downgrade+0x900/0x900 [ 48.305199] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.310983] ? mark_held_locks+0x130/0x130 [ 48.315204] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.320463] ? rcu_bh_qs+0xc0/0xc0 [ 48.323984] ? unwind_dump+0x190/0x190 [ 48.327859] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.333380] ? mark_held_locks+0x130/0x130 [ 48.337601] ? mark_page_accessed+0xcb0/0x2040 [ 48.342162] ? activate_page+0x1040/0x1040 [ 48.346380] ? activate_page+0x1040/0x1040 [ 48.350603] ? mark_held_locks+0x130/0x130 [ 48.354821] ? kasan_kmalloc+0xc7/0xe0 [ 48.358688] ? kmem_cache_alloc_trace+0x152/0x750 [ 48.363513] ? ima_add_digest_entry+0xcb/0x6a0 [ 48.368074] ? ima_add_template_entry+0x466/0x7f0 [ 48.372901] ? ima_store_template+0x224/0x310 [ 48.377469] ? pagecache_get_page+0x2d8/0xf00 [ 48.381947] ? find_get_pages_contig+0x15b0/0x15b0 [ 48.386859] ? is_bpf_text_address+0xac/0x170 [ 48.391343] ? lock_downgrade+0x900/0x900 [ 48.395481] ? mark_held_locks+0x130/0x130 [ 48.399703] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.405484] ? mark_held_locks+0x130/0x130 [ 48.409702] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 48.415046] ? lock_downgrade+0x900/0x900 [ 48.419174] ? kasan_check_read+0x11/0x20 [ 48.423305] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.427706] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.432273] ? mark_held_locks+0x130/0x130 [ 48.436625] ? _raw_spin_unlock+0x2c/0x50 [ 48.440762] ? ext4_discard_preallocations+0x18a/0x13c0 [ 48.446115] ? trace_hardirqs_on+0xbd/0x310 [ 48.450422] ? ext4_exit_mballoc+0xc0/0xc0 [ 48.454642] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 48.459645] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 48.464386] ? modules_open+0xa0/0xa0 [ 48.468168] ? __es_tree_search.isra.12+0x1ba/0x220 [ 48.473166] ? __es_remove_extent+0x9a3/0xba0 [ 48.477642] ? mark_held_locks+0x130/0x130 [ 48.481864] ? lock_downgrade+0x900/0x900 [ 48.485998] ? ext4_es_scan+0x960/0x960 [ 48.489953] ? lock_release+0x970/0x970 [ 48.493914] ? trace_hardirqs_on+0xbd/0x310 [ 48.498216] ? kasan_check_read+0x11/0x20 [ 48.502415] ? clear_inode+0x114/0x3a0 [ 48.506296] ? do_raw_write_trylock+0x1c0/0x1c0 [ 48.510948] ? kasan_check_write+0x14/0x20 [ 48.515168] ? lock_acquire+0x1ed/0x520 [ 48.519201] ? integrity_inode_free+0x77/0x320 [ 48.523774] ? ext4_es_remove_extent+0x151/0x500 [ 48.528512] ? lock_release+0x970/0x970 [ 48.532471] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 48.537555] ? depot_save_stack+0x292/0x470 [ 48.541860] ? kasan_check_write+0x14/0x20 [ 48.546079] ? do_raw_write_lock+0xbd/0x1b0 [ 48.550380] integrity_inode_free+0x12f/0x320 [ 48.554858] security_inode_free+0x19/0x90 [ 48.559076] __destroy_inode+0x328/0x820 [ 48.563122] ? generic_update_time+0x450/0x450 [ 48.567685] ? evict+0x5d8/0x980 [ 48.571034] ? lock_downgrade+0x900/0x900 [ 48.575162] ? __inode_wait_for_writeback+0x2cf/0x380 [ 48.580338] destroy_inode+0xda/0x200 [ 48.584122] ? __destroy_inode+0x820/0x820 [ 48.588343] ? kasan_check_write+0x14/0x20 [ 48.592565] ? do_raw_spin_lock+0xc1/0x200 [ 48.596782] evict+0x5e0/0x980 [ 48.599958] ? jbd2_journal_stop+0x430/0x15d0 [ 48.604435] ? destroy_inode+0x200/0x200 [ 48.608481] ? do_raw_spin_lock+0xc1/0x200 [ 48.612702] ? iput+0x671/0xa90 [ 48.615965] ? lock_downgrade+0x900/0x900 [ 48.620103] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.625630] ? kasan_check_read+0x11/0x20 [ 48.629770] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.634341] ? lock_downgrade+0x900/0x900 [ 48.638471] ? ext4_ioctl+0x231b/0x4210 [ 48.642430] iput+0x679/0xa90 [ 48.645518] ? inode_add_lru+0x2a0/0x2a0 [ 48.649558] ? up_write+0x7b/0x220 [ 48.653080] ? up_read+0x110/0x110 [ 48.656597] ? up_read+0x110/0x110 [ 48.660117] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.665639] ? check_preemption_disabled+0x48/0x200 [ 48.670643] ext4_ioctl+0x236f/0x4210 [ 48.674504] ? is_bpf_text_address+0xac/0x170 [ 48.678993] ? ext4_ioctl_group_add+0x560/0x560 [ 48.683653] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.689431] ? kasan_check_read+0x11/0x20 [ 48.693562] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.698819] ? rcu_bh_qs+0xc0/0xc0 [ 48.702347] ? unwind_dump+0x190/0x190 [ 48.706222] ? is_bpf_text_address+0xd3/0x170 [ 48.710697] ? kernel_text_address+0x79/0xf0 [ 48.715085] ? __kernel_text_address+0xd/0x40 [ 48.719561] ? unwind_get_return_address+0x61/0xa0 [ 48.724473] ? __save_stack_trace+0x8d/0xf0 [ 48.728777] ? save_stack+0xa9/0xd0 [ 48.732382] ? save_stack+0x43/0xd0 [ 48.735986] ? __kasan_slab_free+0x102/0x150 [ 48.740371] ? kasan_slab_free+0xe/0x10 [ 48.744327] ? kmem_cache_free+0x83/0x290 [ 48.748462] ? putname+0xf2/0x130 [ 48.751897] ? do_sys_open+0x54d/0x700 [ 48.755771] ? __x64_sys_openat+0x9d/0x100 [ 48.759988] ? do_syscall_64+0x1b9/0x820 [ 48.764032] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.769378] ? trace_hardirqs_off+0xb8/0x310 [ 48.773766] ? kasan_check_read+0x11/0x20 [ 48.777900] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.782346] ? trace_hardirqs_on+0x310/0x310 [ 48.786746] ? kasan_check_write+0x14/0x20 [ 48.790960] ? trace_hardirqs_off+0xb8/0x310 [ 48.795354] ? trace_hardirqs_on+0x310/0x310 [ 48.799747] ? ext4_ioctl_group_add+0x560/0x560 [ 48.804399] do_vfs_ioctl+0x1de/0x1720 [ 48.808269] ? trace_hardirqs_on+0xbd/0x310 [ 48.812574] ? ioctl_preallocate+0x300/0x300 [ 48.816965] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.822484] ? __fget_light+0x2e9/0x430 [ 48.826441] ? fget_raw+0x20/0x20 [ 48.829947] ? putname+0xf2/0x130 [ 48.833392] ? kmem_cache_free+0x21a/0x290 [ 48.837608] ? putname+0xf7/0x130 [ 48.841051] ? security_file_ioctl+0x94/0xc0 [ 48.845456] ksys_ioctl+0xa9/0xd0 [ 48.848890] __x64_sys_ioctl+0x73/0xb0 [ 48.852763] do_syscall_64+0x1b9/0x820 [ 48.856631] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 48.861978] ? syscall_return_slowpath+0x5e0/0x5e0 [ 48.866887] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.871714] ? trace_hardirqs_on_caller+0x310/0x310 [ 48.876714] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 48.881716] ? prepare_exit_to_usermode+0x291/0x3b0 [ 48.886717] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.891590] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.896766] RIP: 0033:0x440089 [ 48.899940] 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 [ 48.918823] RSP: 002b:00007ffe53d3e738 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 48.926513] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440089 [ 48.933764] RDX: 0000000000440089 RSI: 0000000000006611 RDI: 0000000000000003 [ 48.941058] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 48.948317] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401910 [ 48.955575] R13: 00000000004019a0 R14: 0000000000000000 R15: 0000000000000000 [ 48.962831] Modules linked in: [ 48.966114] ---[ end trace b873c0ff42dee367 ]--- [ 48.970886] RIP: 0010:rb_erase+0x306/0x3710 [ 48.975241] 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 [ 48.994186] RSP: 0018:ffff8801d7cfe918 EFLAGS: 00010202 [ 48.999586] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.006968] RDX: 1ffff1003af9fd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 49.014270] RBP: ffff8801d7cff320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 49.021550] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b925b1f0 [ 49.028803] R13: dffffc0000000000 R14: ffff8801d7cff2f8 R15: ffff8801d7cff438 [ 49.036083] FS: 0000000001b90880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 49.044318] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.050887] CR2: 0000000020000080 CR3: 00000001d8c06000 CR4: 00000000001406f0 [ 49.058181] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.065465] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.072823] Kernel panic - not syncing: Fatal exception [ 49.079181] Kernel Offset: disabled [ 49.082803] Rebooting in 86400 seconds..