[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.218165] audit: type=1800 audit(1538123812.255:25): pid=5655 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 36.243067] audit: type=1800 audit(1538123812.265:26): pid=5655 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 36.270653] audit: type=1800 audit(1538123812.265:27): pid=5655 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 '10.128.0.125' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.361524] kasan: CONFIG_KASAN_INLINE enabled [ 49.366120] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 49.373501] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 49.379742] CPU: 0 PID: 5810 Comm: syz-executor054 Not tainted 4.19.0-rc5+ #119 [ 49.387316] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.396665] RIP: 0010:rb_erase+0x306/0x3710 [ 49.400975] 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 [ 49.419861] RSP: 0018:ffff8801bb98e918 EFLAGS: 00010202 [ 49.425206] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.432465] RDX: 1ffff10037731d2b RSI: ffffffff8b5a08a0 RDI: 0000000000000008 [ 49.439722] RBP: ffff8801bb98f320 R08: dffffc0000000000 R09: fffffbfff135d5c8 [ 49.446974] R10: fffffbfff135d5c8 R11: ffffffff89aeae43 R12: ffff8801c5007270 [ 49.454299] R13: dffffc0000000000 R14: ffff8801bb98f2f8 R15: ffff8801bb98f438 [ 49.461668] FS: 0000000002144880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 49.472962] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.481512] CR2: 0000000020000000 CR3: 00000001d73e7000 CR4: 00000000001406f0 [ 49.489959] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.497213] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.504468] Call Trace: [ 49.507045] ? rb_insert_color+0x1460/0x1460 [ 49.511486] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 49.516405] ? lock_downgrade+0x900/0x900 [ 49.520541] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 49.526320] ? mark_held_locks+0x130/0x130 [ 49.530541] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 49.535798] ? rcu_bh_qs+0xc0/0xc0 [ 49.539425] ? unwind_dump+0x190/0x190 [ 49.543305] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.548824] ? mark_held_locks+0x130/0x130 [ 49.553047] ? mark_page_accessed+0xcb0/0x2040 [ 49.557655] ? activate_page+0x1040/0x1040 [ 49.561880] ? activate_page+0x1040/0x1040 [ 49.566111] ? mark_held_locks+0x130/0x130 [ 49.570332] ? kasan_kmalloc+0xc7/0xe0 [ 49.574213] ? kmem_cache_alloc_trace+0x152/0x750 [ 49.579297] ? ima_add_digest_entry+0xcb/0x6a0 [ 49.583867] ? ima_add_template_entry+0x466/0x7f0 [ 49.588693] ? ima_store_template+0x224/0x310 [ 49.593175] ? pagecache_get_page+0x2d8/0xf00 [ 49.597663] ? find_get_pages_contig+0x15b0/0x15b0 [ 49.602579] ? is_bpf_text_address+0xac/0x170 [ 49.607062] ? lock_downgrade+0x900/0x900 [ 49.611262] ? mark_held_locks+0x130/0x130 [ 49.615490] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 49.621555] ? mark_held_locks+0x130/0x130 [ 49.627515] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 49.634961] ? lock_downgrade+0x900/0x900 [ 49.640980] ? kasan_check_read+0x11/0x20 [ 49.645438] ? do_raw_spin_unlock+0xa7/0x2f0 [ 49.650586] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 49.656543] ? mark_held_locks+0x130/0x130 [ 49.661949] ? _raw_spin_unlock+0x2c/0x50 [ 49.667566] ? ext4_discard_preallocations+0x18a/0x13c0 [ 49.673712] ? trace_hardirqs_on+0xbd/0x310 [ 49.678020] ? ext4_exit_mballoc+0xc0/0xc0 [ 49.682244] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 49.687244] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 49.691985] ? modules_open+0xa0/0xa0 [ 49.695771] ? __es_tree_search.isra.12+0x1ba/0x220 [ 49.700771] ? __es_remove_extent+0x9a3/0xba0 [ 49.705253] ? mark_held_locks+0x130/0x130 [ 49.709469] ? lock_downgrade+0x900/0x900 [ 49.713600] ? ext4_es_scan+0x960/0x960 [ 49.717558] ? lock_release+0x970/0x970 [ 49.721636] ? trace_hardirqs_on+0xbd/0x310 [ 49.725945] ? kasan_check_read+0x11/0x20 [ 49.730077] ? clear_inode+0x114/0x3a0 [ 49.734003] ? do_raw_write_trylock+0x1c0/0x1c0 [ 49.738664] ? kasan_check_write+0x14/0x20 [ 49.742883] ? lock_acquire+0x1ed/0x520 [ 49.746869] ? integrity_inode_free+0x77/0x320 [ 49.751438] ? ext4_es_remove_extent+0x151/0x500 [ 49.756176] ? lock_release+0x970/0x970 [ 49.760146] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 49.765755] ? depot_save_stack+0x292/0x470 [ 49.770930] ? kasan_check_write+0x14/0x20 [ 49.775149] ? do_raw_write_lock+0xbd/0x1b0 [ 49.779455] integrity_inode_free+0x12f/0x320 [ 49.783936] security_inode_free+0x19/0x90 [ 49.788154] __destroy_inode+0x328/0x820 [ 49.792203] ? generic_update_time+0x450/0x450 [ 49.796769] ? evict+0x5d8/0x980 [ 49.800121] ? lock_downgrade+0x900/0x900 [ 49.804253] ? __inode_wait_for_writeback+0x2cf/0x380 [ 49.809430] destroy_inode+0xda/0x200 [ 49.813212] ? __destroy_inode+0x820/0x820 [ 49.817429] ? kasan_check_write+0x14/0x20 [ 49.821647] ? do_raw_spin_lock+0xc1/0x200 [ 49.825863] evict+0x5e0/0x980 [ 49.829038] ? jbd2_journal_stop+0x430/0x15d0 [ 49.833515] ? destroy_inode+0x200/0x200 [ 49.837645] ? do_raw_spin_lock+0xc1/0x200 [ 49.841860] ? iput+0x671/0xa90 [ 49.845120] ? lock_downgrade+0x900/0x900 [ 49.849251] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 49.854781] ? kasan_check_read+0x11/0x20 [ 49.858912] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 49.863478] ? lock_downgrade+0x900/0x900 [ 49.867611] ? ext4_ioctl+0x231b/0x4210 [ 49.871568] iput+0x679/0xa90 [ 49.874657] ? inode_add_lru+0x2a0/0x2a0 [ 49.878745] ? up_write+0x7b/0x220 [ 49.882374] ? up_read+0x110/0x110 [ 49.885897] ? up_read+0x110/0x110 [ 49.889418] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.894942] ? check_preemption_disabled+0x48/0x200 [ 49.899946] ext4_ioctl+0x236f/0x4210 [ 49.903735] ? is_bpf_text_address+0xac/0x170 [ 49.908225] ? ext4_ioctl_group_add+0x560/0x560 [ 49.912883] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 49.918660] ? kasan_check_read+0x11/0x20 [ 49.922835] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 49.930512] ? rcu_bh_qs+0xc0/0xc0 [ 49.934426] ? unwind_dump+0x190/0x190 [ 49.938312] ? is_bpf_text_address+0xd3/0x170 [ 49.942793] ? kernel_text_address+0x79/0xf0 [ 49.947620] ? __kernel_text_address+0xd/0x40 [ 49.952101] ? unwind_get_return_address+0x61/0xa0 [ 49.957013] ? __save_stack_trace+0x8d/0xf0 [ 49.961322] ? save_stack+0xa9/0xd0 [ 49.964932] ? save_stack+0x43/0xd0 [ 49.968621] ? __kasan_slab_free+0x102/0x150 [ 49.973015] ? kasan_slab_free+0xe/0x10 [ 49.976969] ? kmem_cache_free+0x83/0x290 [ 49.981098] ? putname+0xf2/0x130 [ 49.984532] ? do_sys_open+0x54d/0x700 [ 49.988402] ? __x64_sys_openat+0x9d/0x100 [ 49.992620] ? do_syscall_64+0x1b9/0x820 [ 49.996664] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.002012] ? trace_hardirqs_off+0xb8/0x310 [ 50.006482] ? kasan_check_read+0x11/0x20 [ 50.010627] ? do_raw_spin_unlock+0xa7/0x2f0 [ 50.015064] ? trace_hardirqs_on+0x310/0x310 [ 50.019462] ? kasan_check_write+0x14/0x20 [ 50.023678] ? trace_hardirqs_off+0xb8/0x310 [ 50.028068] ? trace_hardirqs_on+0x310/0x310 [ 50.032458] ? ext4_ioctl_group_add+0x560/0x560 [ 50.037110] do_vfs_ioctl+0x1de/0x1720 [ 50.040981] ? trace_hardirqs_on+0xbd/0x310 [ 50.045283] ? ioctl_preallocate+0x300/0x300 [ 50.049678] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.055217] ? __fget_light+0x2e9/0x430 [ 50.059173] ? fget_raw+0x20/0x20 [ 50.062616] ? putname+0xf2/0x130 [ 50.066051] ? kmem_cache_free+0x21a/0x290 [ 50.070267] ? putname+0xf7/0x130 [ 50.073706] ? security_file_ioctl+0x94/0xc0 [ 50.078096] ksys_ioctl+0xa9/0xd0 [ 50.081533] __x64_sys_ioctl+0x73/0xb0 [ 50.085415] do_syscall_64+0x1b9/0x820 [ 50.089296] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 50.094641] ? syscall_return_slowpath+0x5e0/0x5e0 [ 50.099550] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.104378] ? trace_hardirqs_on_caller+0x310/0x310 [ 50.109643] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 50.114646] ? prepare_exit_to_usermode+0x291/0x3b0 [ 50.119644] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.124475] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.129647] RIP: 0033:0x440029 [ 50.132826] 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 [ 50.151712] RSP: 002b:00007ffc64039348 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 50.159407] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 50.166660] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000003 [ 50.173918] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 50.181172] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018b0 [ 50.188427] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 50.195687] Modules linked in: [ 50.198972] ---[ end trace 8da03db7675d5fc5 ]--- [ 50.203750] RIP: 0010:rb_erase+0x306/0x3710 [ 50.208062] 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 [ 50.227074] RSP: 0018:ffff8801bb98e918 EFLAGS: 00010202 [ 50.232518] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 50.239807] RDX: 1ffff10037731d2b RSI: ffffffff8b5a08a0 RDI: 0000000000000008 [ 50.247060] RBP: ffff8801bb98f320 R08: dffffc0000000000 R09: fffffbfff135d5c8 [ 50.254337] R10: fffffbfff135d5c8 R11: ffffffff89aeae43 R12: ffff8801c5007270 [ 50.261606] R13: dffffc0000000000 R14: ffff8801bb98f2f8 R15: ffff8801bb98f438 [ 50.268867] FS: 0000000002144880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 50.278548] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.286888] CR2: 0000000020000000 CR3: 00000001d73e7000 CR4: 00000000001406f0 [ 50.297546] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.307884] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.318270] Kernel panic - not syncing: Fatal exception [ 50.324508] Kernel Offset: disabled [ 50.328133] Rebooting in 86400 seconds..