[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.336077] audit: type=1800 audit(1539309099.877:25): pid=5660 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.363917] audit: type=1800 audit(1539309099.877:26): pid=5660 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.396259] audit: type=1800 audit(1539309099.877:27): pid=5660 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 '10.128.10.35' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 44.496868] kasan: CONFIG_KASAN_INLINE enabled [ 44.501484] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 44.508908] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 44.515141] CPU: 1 PID: 5812 Comm: syz-executor327 Not tainted 4.19.0-rc7+ #279 [ 44.522564] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.531907] RIP: 0010:rb_erase+0x306/0x3710 [ 44.536211] 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 [ 44.555094] RSP: 0018:ffff8801c5b26918 EFLAGS: 00010202 [ 44.560438] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 44.567694] RDX: 1ffff10038b64d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 44.574942] RBP: ffff8801c5b27320 R08: dffffc0000000000 R09: fffffbfff12d69a0 [ 44.582192] R10: fffffbfff12d69a0 R11: ffffffff896b4d03 R12: ffff8801b9324970 [ 44.589454] R13: dffffc0000000000 R14: ffff8801c5b272f8 R15: ffff8801c5b27438 [ 44.596704] FS: 000000000201a880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 44.604915] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 44.610788] CR2: 0000000020000080 CR3: 00000001d5819000 CR4: 00000000001406e0 [ 44.618038] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 44.625288] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 44.632533] Call Trace: [ 44.635106] ? rb_insert_color+0x1460/0x1460 [ 44.639518] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 44.644433] ? lock_downgrade+0x900/0x900 [ 44.648565] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 44.654345] ? mark_held_locks+0x130/0x130 [ 44.658580] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 44.663848] ? rcu_bh_qs+0xc0/0xc0 [ 44.667387] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 44.672903] ? mark_held_locks+0x130/0x130 [ 44.677117] ? mark_page_accessed+0xcb0/0x2040 [ 44.681676] ? activate_page+0x1040/0x1040 [ 44.685890] ? activate_page+0x1040/0x1040 [ 44.690110] ? ___might_sleep+0x1ed/0x300 [ 44.694238] ? mark_held_locks+0x130/0x130 [ 44.698454] ? arch_local_save_flags+0x40/0x40 [ 44.703016] ? ima_add_template_entry+0x466/0x7f0 [ 44.707845] ? pagecache_get_page+0x2d8/0xf00 [ 44.712323] ? find_get_pages_contig+0x15b0/0x15b0 [ 44.717240] ? is_bpf_text_address+0xac/0x170 [ 44.721746] ? lock_downgrade+0x900/0x900 [ 44.725874] ? mark_held_locks+0x130/0x130 [ 44.730092] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 44.735875] ? mark_held_locks+0x130/0x130 [ 44.740094] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 44.745435] ? lock_downgrade+0x900/0x900 [ 44.749592] ? kasan_check_read+0x11/0x20 [ 44.753719] ? do_raw_spin_unlock+0xa7/0x2f0 [ 44.758107] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 44.762669] ? mark_held_locks+0x130/0x130 [ 44.766887] ? _raw_spin_unlock+0x2c/0x50 [ 44.771016] ? ext4_discard_preallocations+0x18a/0x13c0 [ 44.776363] ? trace_hardirqs_on+0xbd/0x310 [ 44.780684] ? ext4_exit_mballoc+0xc0/0xc0 [ 44.784904] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 44.790077] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 44.794822] ? modules_open+0xa0/0xa0 [ 44.798606] ? __es_tree_search.isra.12+0x1ba/0x220 [ 44.803603] ? __es_remove_extent+0x9a3/0xba0 [ 44.808081] ? mark_held_locks+0x130/0x130 [ 44.812293] ? lock_downgrade+0x900/0x900 [ 44.816422] ? ext4_es_scan+0x960/0x960 [ 44.820377] ? lock_release+0x970/0x970 [ 44.824338] ? trace_hardirqs_on+0xbd/0x310 [ 44.828638] ? kasan_check_read+0x11/0x20 [ 44.832778] ? clear_inode+0x114/0x3a0 [ 44.836647] ? do_raw_write_trylock+0x1c0/0x1c0 [ 44.841294] ? kasan_check_write+0x14/0x20 [ 44.845511] ? lock_acquire+0x1ed/0x520 [ 44.849463] ? integrity_inode_free+0x77/0x320 [ 44.854026] ? ext4_es_remove_extent+0x151/0x500 [ 44.858761] ? lock_release+0x970/0x970 [ 44.862713] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 44.867795] ? depot_save_stack+0x292/0x470 [ 44.872103] ? kasan_check_write+0x14/0x20 [ 44.876318] ? do_raw_write_lock+0xbd/0x1b0 [ 44.880625] integrity_inode_free+0x12f/0x320 [ 44.885106] security_inode_free+0x19/0x90 [ 44.889357] __destroy_inode+0x328/0x820 [ 44.893398] ? generic_update_time+0x450/0x450 [ 44.897960] ? evict+0x5d8/0x980 [ 44.901307] ? lock_downgrade+0x900/0x900 [ 44.905455] ? __inode_wait_for_writeback+0x2cf/0x380 [ 44.910644] destroy_inode+0xda/0x200 [ 44.914423] ? __destroy_inode+0x820/0x820 [ 44.918635] ? kasan_check_write+0x14/0x20 [ 44.922851] ? do_raw_spin_lock+0xc1/0x200 [ 44.927069] evict+0x5e0/0x980 [ 44.930255] ? jbd2_journal_stop+0x430/0x15d0 [ 44.934731] ? destroy_inode+0x200/0x200 [ 44.938775] ? do_raw_spin_lock+0xc1/0x200 [ 44.942985] ? iput+0x671/0xa90 [ 44.946245] ? lock_downgrade+0x900/0x900 [ 44.950376] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 44.955908] ? kasan_check_read+0x11/0x20 [ 44.960040] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 44.964603] ? lock_downgrade+0x900/0x900 [ 44.968730] ? ext4_ioctl+0x231b/0x4210 [ 44.972681] iput+0x679/0xa90 [ 44.975767] ? inode_add_lru+0x2a0/0x2a0 [ 44.979811] ? up_write+0x7b/0x220 [ 44.983349] ? up_read+0x110/0x110 [ 44.986881] ? up_read+0x110/0x110 [ 44.990398] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.995918] ? check_preemption_disabled+0x48/0x200 [ 45.000931] ext4_ioctl+0x236f/0x4210 [ 45.004714] ? is_bpf_text_address+0xac/0x170 [ 45.009188] ? ext4_ioctl_group_add+0x560/0x560 [ 45.013858] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 45.019632] ? kasan_check_read+0x11/0x20 [ 45.023765] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 45.029019] ? rcu_bh_qs+0xc0/0xc0 [ 45.032538] ? unwind_dump+0x190/0x190 [ 45.036424] ? is_bpf_text_address+0xd3/0x170 [ 45.040901] ? kernel_text_address+0x79/0xf0 [ 45.045290] ? __kernel_text_address+0xd/0x40 [ 45.049766] ? unwind_get_return_address+0x61/0xa0 [ 45.054679] ? __save_stack_trace+0x8d/0xf0 [ 45.058982] ? save_stack+0xa9/0xd0 [ 45.062588] ? save_stack+0x43/0xd0 [ 45.066193] ? __kasan_slab_free+0x102/0x150 [ 45.070578] ? kasan_slab_free+0xe/0x10 [ 45.074534] ? kmem_cache_free+0x83/0x290 [ 45.078659] ? putname+0xf2/0x130 [ 45.082105] ? do_sys_open+0x54d/0x700 [ 45.085974] ? __x64_sys_openat+0x9d/0x100 [ 45.090187] ? do_syscall_64+0x1b9/0x820 [ 45.094245] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.099608] ? trace_hardirqs_off+0xb8/0x310 [ 45.103999] ? kasan_check_read+0x11/0x20 [ 45.108130] ? do_raw_spin_unlock+0xa7/0x2f0 [ 45.112518] ? trace_hardirqs_on+0x310/0x310 [ 45.116909] ? kasan_check_write+0x14/0x20 [ 45.121146] ? trace_hardirqs_off+0xb8/0x310 [ 45.125539] ? trace_hardirqs_on+0x310/0x310 [ 45.129932] ? ext4_ioctl_group_add+0x560/0x560 [ 45.134585] do_vfs_ioctl+0x1de/0x1720 [ 45.138451] ? trace_hardirqs_on+0xbd/0x310 [ 45.142754] ? ioctl_preallocate+0x300/0x300 [ 45.147145] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.152660] ? __fget_light+0x2e9/0x430 [ 45.156614] ? fget_raw+0x20/0x20 [ 45.160047] ? putname+0xf2/0x130 [ 45.163482] ? kmem_cache_free+0x21a/0x290 [ 45.167699] ? putname+0xf7/0x130 [ 45.171147] ? security_file_ioctl+0x94/0xc0 [ 45.175536] ksys_ioctl+0xa9/0xd0 [ 45.178971] __x64_sys_ioctl+0x73/0xb0 [ 45.182844] do_syscall_64+0x1b9/0x820 [ 45.186713] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 45.192059] ? syscall_return_slowpath+0x5e0/0x5e0 [ 45.196968] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.201791] ? trace_hardirqs_on_caller+0x310/0x310 [ 45.206789] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 45.211785] ? prepare_exit_to_usermode+0x291/0x3b0 [ 45.216788] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.221615] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.226785] RIP: 0033:0x440009 [ 45.229965] 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 [ 45.248847] RSP: 002b:00007ffc353e2fe8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 45.256539] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 45.263788] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 45.271036] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 45.278285] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 45.285535] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 45.292785] Modules linked in: [ 45.296046] ---[ end trace 2063013854d1d2f3 ]--- [ 45.300814] RIP: 0010:rb_erase+0x306/0x3710 [ 45.305182] 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 [ 45.324137] RSP: 0018:ffff8801c5b26918 EFLAGS: 00010202 [ 45.329503] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 45.336882] RDX: 1ffff10038b64d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 45.344184] RBP: ffff8801c5b27320 R08: dffffc0000000000 R09: fffffbfff12d69a0 [ 45.351450] R10: fffffbfff12d69a0 R11: ffffffff896b4d03 R12: ffff8801b9324970 [ 45.358748] R13: dffffc0000000000 R14: ffff8801c5b272f8 R15: ffff8801c5b27438 [ 45.366036] FS: 000000000201a880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 45.374277] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.380156] CR2: 0000000020000080 CR3: 00000001d5819000 CR4: 00000000001406e0 [ 45.387441] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.394732] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.401983] Kernel panic - not syncing: Fatal exception [ 45.408133] Kernel Offset: disabled [ 45.411750] Rebooting in 86400 seconds..