[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.617811] audit: type=1800 audit(1539190817.209:25): pid=5662 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 36.643487] audit: type=1800 audit(1539190817.209:26): pid=5662 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 36.668990] audit: type=1800 audit(1539190817.209:27): pid=5662 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: [ 48.327247] kasan: CONFIG_KASAN_INLINE enabled [ 48.331980] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 48.339479] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 48.345712] CPU: 0 PID: 5814 Comm: syz-executor999 Not tainted 4.19.0-rc6+ #135 [ 48.353263] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.362611] RIP: 0010:rb_erase+0x306/0x3710 [ 48.366915] 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 [ 48.385906] RSP: 0018:ffff8801bc326918 EFLAGS: 00010202 [ 48.391265] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 48.398632] RDX: 1ffff10037864d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 48.405887] RBP: ffff8801bc327320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 48.413139] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b93441f0 [ 48.420443] R13: dffffc0000000000 R14: ffff8801bc3272f8 R15: ffff8801bc327438 [ 48.427714] FS: 00000000015d2880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 48.436044] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.441906] CR2: 0000000020000080 CR3: 00000001bc20a000 CR4: 00000000001406f0 [ 48.449158] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.456409] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.463660] Call Trace: [ 48.466248] ? rb_insert_color+0x1460/0x1460 [ 48.470667] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 48.475587] ? lock_downgrade+0x900/0x900 [ 48.479722] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.485505] ? mark_held_locks+0x130/0x130 [ 48.489722] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.494986] ? rcu_bh_qs+0xc0/0xc0 [ 48.498508] ? unwind_dump+0x190/0x190 [ 48.502383] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.507901] ? mark_held_locks+0x130/0x130 [ 48.512115] ? mark_page_accessed+0xcb0/0x2040 [ 48.516723] ? activate_page+0x1040/0x1040 [ 48.520946] ? activate_page+0x1040/0x1040 [ 48.525280] ? mark_held_locks+0x130/0x130 [ 48.529500] ? kasan_kmalloc+0xc7/0xe0 [ 48.533368] ? kmem_cache_alloc_trace+0x152/0x750 [ 48.538197] ? ima_add_digest_entry+0xcb/0x6a0 [ 48.542763] ? ima_add_template_entry+0x466/0x7f0 [ 48.547590] ? ima_store_template+0x224/0x310 [ 48.552071] ? pagecache_get_page+0x2d8/0xf00 [ 48.556555] ? find_get_pages_contig+0x15b0/0x15b0 [ 48.561473] ? is_bpf_text_address+0xac/0x170 [ 48.565951] ? lock_downgrade+0x900/0x900 [ 48.570082] ? mark_held_locks+0x130/0x130 [ 48.574310] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.580110] ? mark_held_locks+0x130/0x130 [ 48.584358] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 48.589713] ? lock_downgrade+0x900/0x900 [ 48.593844] ? kasan_check_read+0x11/0x20 [ 48.597981] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.602480] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.607056] ? mark_held_locks+0x130/0x130 [ 48.611277] ? _raw_spin_unlock+0x2c/0x50 [ 48.615413] ? ext4_discard_preallocations+0x18a/0x13c0 [ 48.620767] ? trace_hardirqs_on+0xbd/0x310 [ 48.625079] ? ext4_exit_mballoc+0xc0/0xc0 [ 48.629296] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 48.634309] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 48.639073] ? modules_open+0xa0/0xa0 [ 48.642972] ? __es_tree_search.isra.12+0x1ba/0x220 [ 48.647977] ? __es_remove_extent+0x9a3/0xba0 [ 48.652457] ? mark_held_locks+0x130/0x130 [ 48.656675] ? lock_downgrade+0x900/0x900 [ 48.660809] ? ext4_es_scan+0x960/0x960 [ 48.664792] ? lock_release+0x970/0x970 [ 48.668748] ? trace_hardirqs_on+0xbd/0x310 [ 48.673049] ? kasan_check_read+0x11/0x20 [ 48.677178] ? clear_inode+0x114/0x3a0 [ 48.681049] ? do_raw_write_trylock+0x1c0/0x1c0 [ 48.685704] ? kasan_check_write+0x14/0x20 [ 48.689985] ? lock_acquire+0x1ed/0x520 [ 48.694081] ? integrity_inode_free+0x77/0x320 [ 48.698651] ? ext4_es_remove_extent+0x151/0x500 [ 48.703391] ? lock_release+0x970/0x970 [ 48.707347] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 48.712435] ? depot_save_stack+0x292/0x470 [ 48.716738] ? kasan_check_write+0x14/0x20 [ 48.720996] ? do_raw_write_lock+0xbd/0x1b0 [ 48.725352] integrity_inode_free+0x12f/0x320 [ 48.729850] security_inode_free+0x19/0x90 [ 48.734175] __destroy_inode+0x328/0x820 [ 48.738222] ? generic_update_time+0x450/0x450 [ 48.742785] ? evict+0x5d8/0x980 [ 48.746132] ? lock_downgrade+0x900/0x900 [ 48.750301] ? __inode_wait_for_writeback+0x2cf/0x380 [ 48.755640] destroy_inode+0xda/0x200 [ 48.759426] ? __destroy_inode+0x820/0x820 [ 48.763657] ? kasan_check_write+0x14/0x20 [ 48.767901] ? do_raw_spin_lock+0xc1/0x200 [ 48.772118] evict+0x5e0/0x980 [ 48.775298] ? jbd2_journal_stop+0x430/0x15d0 [ 48.779905] ? destroy_inode+0x200/0x200 [ 48.783948] ? do_raw_spin_lock+0xc1/0x200 [ 48.788161] ? iput+0x671/0xa90 [ 48.791430] ? lock_downgrade+0x900/0x900 [ 48.795644] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.801167] ? kasan_check_read+0x11/0x20 [ 48.805378] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.809978] ? lock_downgrade+0x900/0x900 [ 48.814348] ? ext4_ioctl+0x231b/0x4210 [ 48.818332] iput+0x679/0xa90 [ 48.821429] ? inode_add_lru+0x2a0/0x2a0 [ 48.825477] ? up_write+0x7b/0x220 [ 48.829004] ? up_read+0x110/0x110 [ 48.832524] ? up_read+0x110/0x110 [ 48.836086] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.841629] ? check_preemption_disabled+0x48/0x200 [ 48.846630] ext4_ioctl+0x236f/0x4210 [ 48.850413] ? is_bpf_text_address+0xac/0x170 [ 48.854895] ? ext4_ioctl_group_add+0x560/0x560 [ 48.859551] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.865335] ? kasan_check_read+0x11/0x20 [ 48.869467] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.874771] ? rcu_bh_qs+0xc0/0xc0 [ 48.878300] ? unwind_dump+0x190/0x190 [ 48.882185] ? is_bpf_text_address+0xd3/0x170 [ 48.886686] ? kernel_text_address+0x79/0xf0 [ 48.891078] ? __kernel_text_address+0xd/0x40 [ 48.895555] ? unwind_get_return_address+0x61/0xa0 [ 48.900474] ? __save_stack_trace+0x8d/0xf0 [ 48.904866] ? save_stack+0xa9/0xd0 [ 48.908531] ? save_stack+0x43/0xd0 [ 48.912149] ? __kasan_slab_free+0x102/0x150 [ 48.916542] ? kasan_slab_free+0xe/0x10 [ 48.920499] ? kmem_cache_free+0x83/0x290 [ 48.924631] ? putname+0xf2/0x130 [ 48.928068] ? do_sys_open+0x54d/0x700 [ 48.931938] ? __x64_sys_openat+0x9d/0x100 [ 48.936157] ? do_syscall_64+0x1b9/0x820 [ 48.940200] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.945547] ? trace_hardirqs_off+0xb8/0x310 [ 48.949940] ? kasan_check_read+0x11/0x20 [ 48.954071] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.958479] ? trace_hardirqs_on+0x310/0x310 [ 48.962869] ? kasan_check_write+0x14/0x20 [ 48.967216] ? trace_hardirqs_off+0xb8/0x310 [ 48.971614] ? trace_hardirqs_on+0x310/0x310 [ 48.976008] ? ext4_ioctl_group_add+0x560/0x560 [ 48.980680] do_vfs_ioctl+0x1de/0x1720 [ 48.984556] ? trace_hardirqs_on+0xbd/0x310 [ 48.988861] ? ioctl_preallocate+0x300/0x300 [ 48.993254] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.998781] ? __fget_light+0x2e9/0x430 [ 49.002744] ? fget_raw+0x20/0x20 [ 49.006270] ? putname+0xf2/0x130 [ 49.009713] ? kmem_cache_free+0x21a/0x290 [ 49.013932] ? putname+0xf7/0x130 [ 49.017388] ? security_file_ioctl+0x94/0xc0 [ 49.021785] ksys_ioctl+0xa9/0xd0 [ 49.025225] __x64_sys_ioctl+0x73/0xb0 [ 49.029098] do_syscall_64+0x1b9/0x820 [ 49.032986] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 49.038426] ? syscall_return_slowpath+0x5e0/0x5e0 [ 49.043455] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.048282] ? trace_hardirqs_on_caller+0x310/0x310 [ 49.053286] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 49.058290] ? prepare_exit_to_usermode+0x291/0x3b0 [ 49.063290] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.068119] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.073287] RIP: 0033:0x440009 [ 49.076466] 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 [ 49.095368] RSP: 002b:00007ffe74b2f8d8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 49.103088] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 49.110348] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 49.117598] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 49.124976] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 49.132228] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 49.139484] Modules linked in: [ 49.142802] ---[ end trace 0d697f32b02125dd ]--- [ 49.147582] RIP: 0010:rb_erase+0x306/0x3710 [ 49.151894] 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 [ 49.170888] RSP: 0018:ffff8801bc326918 EFLAGS: 00010202 [ 49.176285] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.183543] RDX: 1ffff10037864d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 49.190885] RBP: ffff8801bc327320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 49.198173] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b93441f0 [ 49.205759] R13: dffffc0000000000 R14: ffff8801bc3272f8 R15: ffff8801bc327438 [ 49.213045] FS: 00000000015d2880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 49.221468] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.227453] CR2: 0000000020000080 CR3: 00000001bc20a000 CR4: 00000000001406f0 [ 49.234751] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.242141] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.249472] Kernel panic - not syncing: Fatal exception [ 49.255823] Kernel Offset: disabled [ 49.259518] Rebooting in 86400 seconds..