[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.542487] audit: type=1800 audit(1538811073.130:25): pid=5668 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.572953] audit: type=1800 audit(1538811073.130:26): pid=5668 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.601274] audit: type=1800 audit(1538811073.140:27): pid=5668 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 '10.128.0.71' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 45.160454] kasan: CONFIG_KASAN_INLINE enabled [ 45.165043] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 45.172430] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 45.178670] CPU: 0 PID: 5820 Comm: syz-executor531 Not tainted 4.19.0-rc6+ #246 [ 45.186094] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.195437] RIP: 0010:rb_erase+0x306/0x3710 [ 45.199740] 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 [ 45.218623] RSP: 0018:ffff8801d74a6918 EFLAGS: 00010202 [ 45.223970] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 45.231221] RDX: 1ffff1003ae94d2b RSI: ffffffff8afc28a0 RDI: 0000000000000008 [ 45.238472] RBP: ffff8801d74a7320 R08: dffffc0000000000 R09: fffffbfff12d6a90 [ 45.245987] R10: fffffbfff12d6a90 R11: ffffffff896b5483 R12: ffff8801b9368970 [ 45.253253] R13: dffffc0000000000 R14: ffff8801d74a72f8 R15: ffff8801d74a7438 [ 45.260506] FS: 0000000000bf8880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 45.268712] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.274571] CR2: 0000000020000040 CR3: 00000001d7c9a000 CR4: 00000000001406f0 [ 45.281819] Call Trace: [ 45.284401] ? rb_insert_color+0x1460/0x1460 [ 45.288793] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 45.293531] ? is_bpf_text_address+0xac/0x170 [ 45.298009] ? lock_downgrade+0x900/0x900 [ 45.302146] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 45.307932] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.313449] ? mark_page_accessed+0xcb0/0x2040 [ 45.318018] ? activate_page+0x1040/0x1040 [ 45.322238] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.327773] ? mark_held_locks+0x130/0x130 [ 45.331993] ? mark_page_accessed+0xcb0/0x2040 [ 45.336555] ? activate_page+0x1040/0x1040 [ 45.340769] ? activate_page+0x1040/0x1040 [ 45.344989] ? mark_held_locks+0x130/0x130 [ 45.349203] ? kasan_kmalloc+0xc7/0xe0 [ 45.353073] ? kmem_cache_alloc_trace+0x152/0x750 [ 45.357898] ? ima_add_digest_entry+0xcb/0x6a0 [ 45.362462] ? ima_add_template_entry+0x466/0x7f0 [ 45.367299] ? ima_store_template+0x224/0x310 [ 45.371775] ? ima_store_measurement+0x321/0x630 [ 45.376512] ? process_measurement+0x15c4/0x1bf0 [ 45.381250] ? ima_file_check+0xe5/0x130 [ 45.385291] ? path_openat+0x134d/0x5160 [ 45.389331] ? do_filp_open+0x255/0x380 [ 45.393286] ? do_sys_open+0x568/0x700 [ 45.397155] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.402153] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 45.406896] ? is_bpf_text_address+0xac/0x170 [ 45.411636] ? lock_downgrade+0x900/0x900 [ 45.415768] ? mark_held_locks+0x130/0x130 [ 45.419990] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 45.425770] ? mark_held_locks+0x130/0x130 [ 45.429990] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 45.435335] ? lock_downgrade+0x900/0x900 [ 45.439466] ? kasan_check_read+0x11/0x20 [ 45.443594] ? do_raw_spin_unlock+0xa7/0x2f0 [ 45.447986] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 45.452552] ? mark_held_locks+0x130/0x130 [ 45.456867] ? _raw_spin_unlock+0x2c/0x50 [ 45.460997] ? ext4_discard_preallocations+0x18a/0x13c0 [ 45.466346] ? trace_hardirqs_on+0xbd/0x310 [ 45.470649] ? ext4_exit_mballoc+0xc0/0xc0 [ 45.474869] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.479869] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 45.484609] ? modules_open+0xa0/0xa0 [ 45.488395] ? __es_tree_search.isra.12+0x1ba/0x220 [ 45.493396] ? __es_remove_extent+0x9a3/0xba0 [ 45.497875] ? mark_held_locks+0x130/0x130 [ 45.502093] ? lock_downgrade+0x900/0x900 [ 45.506224] ? ext4_es_scan+0x960/0x960 [ 45.510177] ? lock_release+0x970/0x970 [ 45.514136] ? trace_hardirqs_on+0xbd/0x310 [ 45.518437] ? kasan_check_read+0x11/0x20 [ 45.522564] ? clear_inode+0x114/0x3a0 [ 45.526433] ? do_raw_write_trylock+0x1c0/0x1c0 [ 45.531083] ? kasan_check_write+0x14/0x20 [ 45.535301] ? lock_acquire+0x1ed/0x520 [ 45.539259] ? integrity_inode_free+0x77/0x320 [ 45.543838] ? ext4_es_remove_extent+0x151/0x500 [ 45.548582] ? lock_release+0x970/0x970 [ 45.552542] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 45.557627] ? depot_save_stack+0x292/0x470 [ 45.561935] ? kasan_check_write+0x14/0x20 [ 45.566151] ? do_raw_write_lock+0xbd/0x1b0 [ 45.570454] integrity_inode_free+0x12f/0x320 [ 45.574935] security_inode_free+0x19/0x90 [ 45.579152] __destroy_inode+0x328/0x820 [ 45.583195] ? generic_update_time+0x450/0x450 [ 45.587760] ? evict+0x5d8/0x980 [ 45.591131] ? lock_downgrade+0x900/0x900 [ 45.595269] ? __inode_wait_for_writeback+0x2cf/0x380 [ 45.600441] destroy_inode+0xda/0x200 [ 45.604225] ? __destroy_inode+0x820/0x820 [ 45.608438] ? kasan_check_write+0x14/0x20 [ 45.612655] ? do_raw_spin_lock+0xc1/0x200 [ 45.616873] evict+0x5e0/0x980 [ 45.620045] ? jbd2_journal_stop+0x430/0x15d0 [ 45.624529] ? destroy_inode+0x200/0x200 [ 45.628572] ? do_raw_spin_lock+0xc1/0x200 [ 45.632783] ? iput+0x671/0xa90 [ 45.636043] ? lock_downgrade+0x900/0x900 [ 45.640173] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 45.645695] ? kasan_check_read+0x11/0x20 [ 45.649827] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 45.654412] ? lock_downgrade+0x900/0x900 [ 45.658561] ? ext4_ioctl+0x231b/0x4210 [ 45.662519] iput+0x679/0xa90 [ 45.665607] ? inode_add_lru+0x2a0/0x2a0 [ 45.669667] ? up_write+0x7b/0x220 [ 45.673191] ? up_read+0x110/0x110 [ 45.676714] ? up_read+0x110/0x110 [ 45.680234] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.685754] ? check_preemption_disabled+0x48/0x200 [ 45.690769] ext4_ioctl+0x236f/0x4210 [ 45.694576] ? is_bpf_text_address+0xac/0x170 [ 45.699054] ? ext4_ioctl_group_add+0x560/0x560 [ 45.703706] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 45.709485] ? kasan_check_read+0x11/0x20 [ 45.713613] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 45.718873] ? rcu_bh_qs+0xc0/0xc0 [ 45.722394] ? unwind_dump+0x190/0x190 [ 45.726267] ? is_bpf_text_address+0xd3/0x170 [ 45.730741] ? kernel_text_address+0x79/0xf0 [ 45.735133] ? __kernel_text_address+0xd/0x40 [ 45.739609] ? unwind_get_return_address+0x61/0xa0 [ 45.744536] ? __save_stack_trace+0x8d/0xf0 [ 45.748860] ? save_stack+0xa9/0xd0 [ 45.752467] ? save_stack+0x43/0xd0 [ 45.756079] ? __kasan_slab_free+0x102/0x150 [ 45.760466] ? kasan_slab_free+0xe/0x10 [ 45.764422] ? kmem_cache_free+0x83/0x290 [ 45.768551] ? putname+0xf2/0x130 [ 45.771986] ? do_sys_open+0x54d/0x700 [ 45.775858] ? __x64_sys_openat+0x9d/0x100 [ 45.780083] ? do_syscall_64+0x1b9/0x820 [ 45.784140] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.789489] ? trace_hardirqs_off+0xb8/0x310 [ 45.793892] ? kasan_check_read+0x11/0x20 [ 45.798021] ? do_raw_spin_unlock+0xa7/0x2f0 [ 45.802406] ? trace_hardirqs_on+0x310/0x310 [ 45.806801] ? kasan_check_write+0x14/0x20 [ 45.811041] ? trace_hardirqs_off+0xb8/0x310 [ 45.815432] ? trace_hardirqs_on+0x310/0x310 [ 45.819821] ? ext4_ioctl_group_add+0x560/0x560 [ 45.824481] do_vfs_ioctl+0x1de/0x1720 [ 45.828348] ? trace_hardirqs_on+0xbd/0x310 [ 45.832646] ? ioctl_preallocate+0x300/0x300 [ 45.837037] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.842562] ? __fget_light+0x2e9/0x430 [ 45.846517] ? fget_raw+0x20/0x20 [ 45.849948] ? putname+0xf2/0x130 [ 45.853391] ? kmem_cache_free+0x21a/0x290 [ 45.857608] ? putname+0xf7/0x130 [ 45.861053] ? security_file_ioctl+0x94/0xc0 [ 45.865440] ksys_ioctl+0xa9/0xd0 [ 45.868888] __x64_sys_ioctl+0x73/0xb0 [ 45.872768] do_syscall_64+0x1b9/0x820 [ 45.876638] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 45.881984] ? syscall_return_slowpath+0x5e0/0x5e0 [ 45.886909] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.891734] ? trace_hardirqs_on_caller+0x310/0x310 [ 45.896734] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 45.901733] ? prepare_exit_to_usermode+0x291/0x3b0 [ 45.906744] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.911583] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.916753] RIP: 0033:0x440029 [ 45.919932] 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 [ 45.938813] RSP: 002b:00007ffd802925e8 EFLAGS: 00000207 ORIG_RAX: 0000000000000010 [ 45.946498] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 45.953746] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000003 [ 45.961021] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 45.968271] R10: 0000000000000000 R11: 0000000000000207 R12: 00000000004018b0 [ 45.975519] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 45.982787] Modules linked in: [ 45.986101] ---[ end trace 91fc5cbf5b502c67 ]--- [ 45.990891] RIP: 0010:rb_erase+0x306/0x3710 [ 45.995210] 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 [ 46.014142] RSP: 0018:ffff8801d74a6918 EFLAGS: 00010202 [ 46.019539] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 46.027000] RDX: 1ffff1003ae94d2b RSI: ffffffff8afc28a0 RDI: 0000000000000008 [ 46.034270] RBP: ffff8801d74a7320 R08: dffffc0000000000 R09: fffffbfff12d6a90 [ 46.041575] R10: fffffbfff12d6a90 R11: ffffffff896b5483 R12: ffff8801b9368970 [ 46.048866] R13: dffffc0000000000 R14: ffff8801d74a72f8 R15: ffff8801d74a7438 [ 46.056172] FS: 0000000000bf8880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 46.064396] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.070303] CR2: 0000000020000040 CR3: 00000001d7c9a000 CR4: 00000000001406f0 [ 46.077592] Kernel panic - not syncing: Fatal exception [ 46.083865] Kernel Offset: disabled [ 46.087500] Rebooting in 86400 seconds..