[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.435882] audit: type=1800 audit(1539293326.369:25): pid=5658 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 36.466463] audit: type=1800 audit(1539293326.379:26): pid=5658 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 36.486085] audit: type=1800 audit(1539293326.379:27): pid=5658 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.101' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 45.908634] kasan: CONFIG_KASAN_INLINE enabled [ 45.913235] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 45.920620] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 45.926866] CPU: 0 PID: 5812 Comm: syz-executor770 Not tainted 4.19.0-rc7+ #55 [ 45.934208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.943555] RIP: 0010:rb_erase+0x306/0x3710 [ 45.947859] 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 [ 45.966747] RSP: 0018:ffff8801bc3e6918 EFLAGS: 00010202 [ 45.972096] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 45.979348] RDX: 1ffff1003787cd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 45.986600] RBP: ffff8801bc3e7320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 45.993849] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801c3005330 [ 46.001099] R13: dffffc0000000000 R14: ffff8801bc3e72f8 R15: ffff8801bc3e7438 [ 46.008351] FS: 0000000001a05880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 46.016557] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.022419] CR2: 0000000020000000 CR3: 00000001bba7b000 CR4: 00000000001406f0 [ 46.029674] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.036936] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.044183] Call Trace: [ 46.046758] ? rb_insert_color+0x1460/0x1460 [ 46.051155] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 46.056064] ? lock_downgrade+0x900/0x900 [ 46.060199] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 46.065980] ? mark_held_locks+0x130/0x130 [ 46.070198] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 46.075457] ? rcu_bh_qs+0xc0/0xc0 [ 46.078989] ? unwind_dump+0x190/0x190 [ 46.082863] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 46.088391] ? mark_held_locks+0x130/0x130 [ 46.092606] ? mark_page_accessed+0xcb0/0x2040 [ 46.097167] ? activate_page+0x1040/0x1040 [ 46.101422] ? activate_page+0x1040/0x1040 [ 46.105754] ? mark_held_locks+0x130/0x130 [ 46.109970] ? kasan_kmalloc+0xc7/0xe0 [ 46.113840] ? kmem_cache_alloc_trace+0x152/0x750 [ 46.118672] ? ima_add_digest_entry+0xcb/0x6a0 [ 46.123239] ? ima_add_template_entry+0x466/0x7f0 [ 46.128069] ? ima_store_template+0x224/0x310 [ 46.132554] ? pagecache_get_page+0x2d8/0xf00 [ 46.137054] ? find_get_pages_contig+0x15b0/0x15b0 [ 46.141971] ? is_bpf_text_address+0xac/0x170 [ 46.146449] ? lock_downgrade+0x900/0x900 [ 46.150586] ? mark_held_locks+0x130/0x130 [ 46.154826] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 46.160620] ? mark_held_locks+0x130/0x130 [ 46.164843] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 46.170189] ? lock_downgrade+0x900/0x900 [ 46.174322] ? kasan_check_read+0x11/0x20 [ 46.178455] ? do_raw_spin_unlock+0xa7/0x2f0 [ 46.182846] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 46.187411] ? mark_held_locks+0x130/0x130 [ 46.191644] ? _raw_spin_unlock+0x2c/0x50 [ 46.195772] ? ext4_discard_preallocations+0x18a/0x13c0 [ 46.201121] ? trace_hardirqs_on+0xbd/0x310 [ 46.205427] ? ext4_exit_mballoc+0xc0/0xc0 [ 46.209646] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 46.214645] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 46.219384] ? modules_open+0xa0/0xa0 [ 46.223166] ? __es_tree_search.isra.12+0x1ba/0x220 [ 46.228183] ? __es_remove_extent+0x9a3/0xba0 [ 46.232662] ? mark_held_locks+0x130/0x130 [ 46.236904] ? lock_downgrade+0x900/0x900 [ 46.241064] ? ext4_es_scan+0x960/0x960 [ 46.245036] ? lock_release+0x970/0x970 [ 46.249006] ? trace_hardirqs_on+0xbd/0x310 [ 46.253322] ? kasan_check_read+0x11/0x20 [ 46.257451] ? clear_inode+0x114/0x3a0 [ 46.261320] ? do_raw_write_trylock+0x1c0/0x1c0 [ 46.265969] ? kasan_check_write+0x14/0x20 [ 46.270191] ? lock_acquire+0x1ed/0x520 [ 46.274145] ? integrity_inode_free+0x77/0x320 [ 46.278710] ? ext4_es_remove_extent+0x151/0x500 [ 46.283444] ? lock_release+0x970/0x970 [ 46.287402] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 46.292487] ? depot_save_stack+0x292/0x470 [ 46.296790] ? kasan_check_write+0x14/0x20 [ 46.301012] ? do_raw_write_lock+0xbd/0x1b0 [ 46.305317] integrity_inode_free+0x12f/0x320 [ 46.309798] security_inode_free+0x19/0x90 [ 46.314016] __destroy_inode+0x328/0x820 [ 46.318065] ? generic_update_time+0x450/0x450 [ 46.322632] ? evict+0x5d8/0x980 [ 46.325979] ? lock_downgrade+0x900/0x900 [ 46.330110] ? __inode_wait_for_writeback+0x2cf/0x380 [ 46.335281] destroy_inode+0xda/0x200 [ 46.339061] ? __destroy_inode+0x820/0x820 [ 46.343275] ? kasan_check_write+0x14/0x20 [ 46.347580] ? do_raw_spin_lock+0xc1/0x200 [ 46.351798] evict+0x5e0/0x980 [ 46.354972] ? jbd2_journal_stop+0x430/0x15d0 [ 46.359448] ? destroy_inode+0x200/0x200 [ 46.363494] ? do_raw_spin_lock+0xc1/0x200 [ 46.367739] ? iput+0x671/0xa90 [ 46.371018] ? lock_downgrade+0x900/0x900 [ 46.375149] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 46.380670] ? kasan_check_read+0x11/0x20 [ 46.384802] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 46.389364] ? lock_downgrade+0x900/0x900 [ 46.393492] ? ext4_ioctl+0x231b/0x4210 [ 46.397450] iput+0x679/0xa90 [ 46.400540] ? inode_add_lru+0x2a0/0x2a0 [ 46.404600] ? up_write+0x7b/0x220 [ 46.408124] ? up_read+0x110/0x110 [ 46.411642] ? up_read+0x110/0x110 [ 46.415164] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.420685] ? check_preemption_disabled+0x48/0x200 [ 46.425688] ext4_ioctl+0x236f/0x4210 [ 46.429475] ? is_bpf_text_address+0xac/0x170 [ 46.433955] ? ext4_ioctl_group_add+0x560/0x560 [ 46.438608] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 46.444409] ? kasan_check_read+0x11/0x20 [ 46.448558] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 46.453826] ? rcu_bh_qs+0xc0/0xc0 [ 46.457347] ? unwind_dump+0x190/0x190 [ 46.461222] ? is_bpf_text_address+0xd3/0x170 [ 46.465702] ? kernel_text_address+0x79/0xf0 [ 46.470090] ? __kernel_text_address+0xd/0x40 [ 46.474567] ? unwind_get_return_address+0x61/0xa0 [ 46.479484] ? __save_stack_trace+0x8d/0xf0 [ 46.483791] ? save_stack+0xa9/0xd0 [ 46.487399] ? save_stack+0x43/0xd0 [ 46.491008] ? __kasan_slab_free+0x102/0x150 [ 46.495397] ? kasan_slab_free+0xe/0x10 [ 46.499363] ? kmem_cache_free+0x83/0x290 [ 46.503508] ? putname+0xf2/0x130 [ 46.506944] ? do_sys_open+0x54d/0x700 [ 46.510810] ? __x64_sys_openat+0x9d/0x100 [ 46.515025] ? do_syscall_64+0x1b9/0x820 [ 46.519068] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.524421] ? trace_hardirqs_off+0xb8/0x310 [ 46.528810] ? kasan_check_read+0x11/0x20 [ 46.532945] ? do_raw_spin_unlock+0xa7/0x2f0 [ 46.537336] ? trace_hardirqs_on+0x310/0x310 [ 46.541724] ? kasan_check_write+0x14/0x20 [ 46.545944] ? trace_hardirqs_off+0xb8/0x310 [ 46.550342] ? trace_hardirqs_on+0x310/0x310 [ 46.554738] ? ext4_ioctl_group_add+0x560/0x560 [ 46.559391] do_vfs_ioctl+0x1de/0x1720 [ 46.563262] ? trace_hardirqs_on+0xbd/0x310 [ 46.567569] ? ioctl_preallocate+0x300/0x300 [ 46.571961] ? memset+0x31/0x40 [ 46.575223] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.580743] ? smack_file_ioctl+0x210/0x3c0 [ 46.585045] ? fget_raw+0x20/0x20 [ 46.588480] ? smack_file_lock+0x2e0/0x2e0 [ 46.592704] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.598225] ? security_file_ioctl+0x94/0xc0 [ 46.602618] ksys_ioctl+0xa9/0xd0 [ 46.606055] __x64_sys_ioctl+0x73/0xb0 [ 46.609933] do_syscall_64+0x1b9/0x820 [ 46.613819] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 46.619164] ? syscall_return_slowpath+0x5e0/0x5e0 [ 46.624089] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.628924] ? trace_hardirqs_on_caller+0x310/0x310 [ 46.633944] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 46.638945] ? prepare_exit_to_usermode+0x291/0x3b0 [ 46.643956] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.648784] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.653959] RIP: 0033:0x440029 [ 46.657136] 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 [ 46.676024] RSP: 002b:00007fff3da45518 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 46.683727] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 46.690980] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000003 [ 46.698251] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 46.705505] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018b0 [ 46.712772] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 46.720027] Modules linked in: [ 46.723344] ---[ end trace 332aed629905f7c4 ]--- [ 46.728270] RIP: 0010:rb_erase+0x306/0x3710 [ 46.732597] 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 [ 46.751523] RSP: 0018:ffff8801bc3e6918 EFLAGS: 00010202 [ 46.756933] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 46.764197] RDX: 1ffff1003787cd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 46.771483] RBP: ffff8801bc3e7320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 46.778787] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801c3005330 [ 46.786056] R13: dffffc0000000000 R14: ffff8801bc3e72f8 R15: ffff8801bc3e7438 [ 46.793345] FS: 0000000001a05880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 46.801587] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.807484] CR2: 0000000020000000 CR3: 00000001bba7b000 CR4: 00000000001406f0 [ 46.814752] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.822042] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.829330] Kernel panic - not syncing: Fatal exception [ 46.835827] Kernel Offset: disabled [ 46.839477] Rebooting in 86400 seconds..