[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 32.691465] audit: type=1800 audit(1538831245.545:25): pid=5655 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 32.709990] audit: type=1800 audit(1538831245.545:26): pid=5655 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 32.729525] audit: type=1800 audit(1538831245.545:27): pid=5655 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 '10.128.10.50' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.080948] kasan: CONFIG_KASAN_INLINE enabled [ 42.085559] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 42.092965] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.099199] CPU: 1 PID: 5811 Comm: syz-executor643 Not tainted 4.19.0-rc6+ #47 [ 42.106544] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.116092] RIP: 0010:rb_erase+0x306/0x3710 [ 42.120392] 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 [ 42.139271] RSP: 0018:ffff8801bb35e918 EFLAGS: 00010202 [ 42.144614] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 42.151879] RDX: 1ffff1003766bd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 42.159141] RBP: ffff8801bb35f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 42.166397] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b87311f0 [ 42.173647] R13: dffffc0000000000 R14: ffff8801bb35f2f8 R15: ffff8801bb35f438 [ 42.180905] FS: 0000000000eeb880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 42.189135] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.195035] CR2: 0000000020000040 CR3: 00000001d31fb000 CR4: 00000000001406e0 [ 42.202290] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.209540] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.216788] Call Trace: [ 42.219360] ? rb_insert_color+0x1460/0x1460 [ 42.223749] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 42.228487] ? is_bpf_text_address+0xac/0x170 [ 42.232965] ? lock_downgrade+0x900/0x900 [ 42.237099] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.242877] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.248758] ? mark_page_accessed+0xcb0/0x2040 [ 42.253324] ? activate_page+0x1040/0x1040 [ 42.257547] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.263068] ? mark_held_locks+0x130/0x130 [ 42.267284] ? mark_page_accessed+0xcb0/0x2040 [ 42.271844] ? activate_page+0x1040/0x1040 [ 42.276062] ? activate_page+0x1040/0x1040 [ 42.280299] ? mark_held_locks+0x130/0x130 [ 42.284514] ? kasan_kmalloc+0xc7/0xe0 [ 42.288396] ? kmem_cache_alloc_trace+0x152/0x750 [ 42.293217] ? ima_add_digest_entry+0xcb/0x6a0 [ 42.297774] ? ima_add_template_entry+0x466/0x7f0 [ 42.302593] ? ima_store_template+0x224/0x310 [ 42.307066] ? ima_store_measurement+0x321/0x630 [ 42.311801] ? process_measurement+0x15c4/0x1bf0 [ 42.316530] ? ima_file_check+0xe5/0x130 [ 42.320570] ? path_openat+0x134d/0x5160 [ 42.324609] ? do_filp_open+0x255/0x380 [ 42.328562] ? do_sys_open+0x568/0x700 [ 42.332433] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 42.337430] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 42.342169] ? is_bpf_text_address+0xac/0x170 [ 42.346645] ? lock_downgrade+0x900/0x900 [ 42.350778] ? mark_held_locks+0x130/0x130 [ 42.354993] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.360773] ? mark_held_locks+0x130/0x130 [ 42.364988] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 42.370329] ? lock_downgrade+0x900/0x900 [ 42.374491] ? kasan_check_read+0x11/0x20 [ 42.378637] ? do_raw_spin_unlock+0xa7/0x2f0 [ 42.383032] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 42.387591] ? mark_held_locks+0x130/0x130 [ 42.391808] ? _raw_spin_unlock+0x2c/0x50 [ 42.395936] ? ext4_discard_preallocations+0x18a/0x13c0 [ 42.401280] ? trace_hardirqs_on+0xbd/0x310 [ 42.405583] ? ext4_exit_mballoc+0xc0/0xc0 [ 42.409799] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 42.414796] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 42.419536] ? modules_open+0xa0/0xa0 [ 42.423329] ? __es_tree_search.isra.12+0x1ba/0x220 [ 42.428327] ? __es_remove_extent+0x9a3/0xba0 [ 42.432804] ? mark_held_locks+0x130/0x130 [ 42.437018] ? lock_downgrade+0x900/0x900 [ 42.441148] ? ext4_es_scan+0x960/0x960 [ 42.445104] ? lock_release+0x970/0x970 [ 42.449055] ? trace_hardirqs_on+0xbd/0x310 [ 42.453354] ? kasan_check_read+0x11/0x20 [ 42.457482] ? clear_inode+0x114/0x3a0 [ 42.461348] ? do_raw_write_trylock+0x1c0/0x1c0 [ 42.466006] ? kasan_check_write+0x14/0x20 [ 42.470283] ? lock_acquire+0x1ed/0x520 [ 42.474253] ? integrity_inode_free+0x77/0x320 [ 42.478812] ? ext4_es_remove_extent+0x151/0x500 [ 42.483547] ? lock_release+0x970/0x970 [ 42.487497] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 42.492581] ? depot_save_stack+0x292/0x470 [ 42.496905] ? kasan_check_write+0x14/0x20 [ 42.501136] ? do_raw_write_lock+0xbd/0x1b0 [ 42.505437] integrity_inode_free+0x12f/0x320 [ 42.509920] security_inode_free+0x19/0x90 [ 42.514137] __destroy_inode+0x328/0x820 [ 42.518176] ? generic_update_time+0x450/0x450 [ 42.522735] ? evict+0x5d8/0x980 [ 42.526079] ? lock_downgrade+0x900/0x900 [ 42.530207] ? __inode_wait_for_writeback+0x2cf/0x380 [ 42.535379] destroy_inode+0xda/0x200 [ 42.539169] ? __destroy_inode+0x820/0x820 [ 42.543388] ? kasan_check_write+0x14/0x20 [ 42.547601] ? do_raw_spin_lock+0xc1/0x200 [ 42.551815] evict+0x5e0/0x980 [ 42.555001] ? jbd2_journal_stop+0x430/0x15d0 [ 42.559504] ? destroy_inode+0x200/0x200 [ 42.563546] ? do_raw_spin_lock+0xc1/0x200 [ 42.567760] ? iput+0x671/0xa90 [ 42.571021] ? lock_downgrade+0x900/0x900 [ 42.575151] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 42.580675] ? kasan_check_read+0x11/0x20 [ 42.584802] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 42.589370] ? lock_downgrade+0x900/0x900 [ 42.593511] ? ext4_ioctl+0x231b/0x4210 [ 42.597466] iput+0x679/0xa90 [ 42.600572] ? inode_add_lru+0x2a0/0x2a0 [ 42.604613] ? up_write+0x7b/0x220 [ 42.608130] ? up_read+0x110/0x110 [ 42.611650] ? up_read+0x110/0x110 [ 42.615177] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.620708] ? check_preemption_disabled+0x48/0x200 [ 42.625704] ext4_ioctl+0x236f/0x4210 [ 42.629488] ? is_bpf_text_address+0xac/0x170 [ 42.633964] ? ext4_ioctl_group_add+0x560/0x560 [ 42.638645] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.644428] ? kasan_check_read+0x11/0x20 [ 42.648556] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 42.653816] ? rcu_bh_qs+0xc0/0xc0 [ 42.657336] ? unwind_dump+0x190/0x190 [ 42.661205] ? is_bpf_text_address+0xd3/0x170 [ 42.665680] ? kernel_text_address+0x79/0xf0 [ 42.670069] ? __kernel_text_address+0xd/0x40 [ 42.674556] ? unwind_get_return_address+0x61/0xa0 [ 42.679468] ? __save_stack_trace+0x8d/0xf0 [ 42.683771] ? save_stack+0xa9/0xd0 [ 42.687395] ? save_stack+0x43/0xd0 [ 42.691018] ? __kasan_slab_free+0x102/0x150 [ 42.695404] ? kasan_slab_free+0xe/0x10 [ 42.699367] ? kmem_cache_free+0x83/0x290 [ 42.703490] ? putname+0xf2/0x130 [ 42.706938] ? do_sys_open+0x54d/0x700 [ 42.710806] ? __x64_sys_openat+0x9d/0x100 [ 42.715024] ? do_syscall_64+0x1b9/0x820 [ 42.719085] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.724434] ? trace_hardirqs_off+0xb8/0x310 [ 42.728821] ? kasan_check_read+0x11/0x20 [ 42.732951] ? do_raw_spin_unlock+0xa7/0x2f0 [ 42.737340] ? trace_hardirqs_on+0x310/0x310 [ 42.741727] ? kasan_check_write+0x14/0x20 [ 42.745942] ? trace_hardirqs_off+0xb8/0x310 [ 42.750337] ? trace_hardirqs_on+0x310/0x310 [ 42.754726] ? ext4_ioctl_group_add+0x560/0x560 [ 42.759374] do_vfs_ioctl+0x1de/0x1720 [ 42.763239] ? trace_hardirqs_on+0xbd/0x310 [ 42.767539] ? ioctl_preallocate+0x300/0x300 [ 42.771927] ? memset+0x31/0x40 [ 42.775202] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.780720] ? smack_file_ioctl+0x210/0x3c0 [ 42.785020] ? fget_raw+0x20/0x20 [ 42.788450] ? smack_file_lock+0x2e0/0x2e0 [ 42.792706] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.798223] ? security_file_ioctl+0x94/0xc0 [ 42.802626] ksys_ioctl+0xa9/0xd0 [ 42.806060] __x64_sys_ioctl+0x73/0xb0 [ 42.809928] do_syscall_64+0x1b9/0x820 [ 42.813794] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 42.819150] ? syscall_return_slowpath+0x5e0/0x5e0 [ 42.824082] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.828907] ? trace_hardirqs_on_caller+0x310/0x310 [ 42.833907] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 42.838921] ? prepare_exit_to_usermode+0x291/0x3b0 [ 42.843936] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.848758] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.853928] RIP: 0033:0x440029 [ 42.857103] 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 [ 42.875996] RSP: 002b:00007ffd0ed11898 EFLAGS: 00000207 ORIG_RAX: 0000000000000010 [ 42.883685] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 42.890940] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000003 [ 42.898190] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 42.905435] R10: 0000000000000000 R11: 0000000000000207 R12: 00000000004018b0 [ 42.912684] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 42.919963] Modules linked in: [ 42.923314] ---[ end trace 2557927c8bcc0614 ]--- [ 42.928085] RIP: 0010:rb_erase+0x306/0x3710 [ 42.932517] 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 [ 42.951484] RSP: 0018:ffff8801bb35e918 EFLAGS: 00010202 [ 42.956840] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 42.964212] RDX: 1ffff1003766bd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 42.971509] RBP: ffff8801bb35f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 42.978775] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b87311f0 [ 42.986051] R13: dffffc0000000000 R14: ffff8801bb35f2f8 R15: ffff8801bb35f438 [ 42.993330] FS: 0000000000eeb880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 43.001564] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.007439] CR2: 0000000020000040 CR3: 00000001d31fb000 CR4: 00000000001406e0 [ 43.014718] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.021998] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.029276] Kernel panic - not syncing: Fatal exception [ 43.035530] Kernel Offset: disabled [ 43.039152] Rebooting in 86400 seconds..