[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c[ 38.704828] mcstransd (5798) used greatest stack depth: 17032 bytes left . Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 42.976964] kauditd_printk_skb: 8 callbacks suppressed [ 42.976979] audit: type=1400 audit(1539253586.777:35): avc: denied { map } for pid=5886 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. executing program [ 49.522492] audit: type=1400 audit(1539253593.327:36): avc: denied { map } for pid=5898 comm="syz-executor573" path="/root/syz-executor573393637" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 49.525687] kasan: CONFIG_KASAN_INLINE enabled [ 49.553444] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 49.560804] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 49.567019] CPU: 0 PID: 5898 Comm: syz-executor573 Not tainted 4.19.0-rc7+ #57 [ 49.574362] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.583708] RIP: 0010:rb_erase+0x306/0x3710 [ 49.588013] 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 [ 49.606897] RSP: 0018:ffff8801c3ea6918 EFLAGS: 00010202 [ 49.612242] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.619493] RDX: 1ffff100387d4d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 49.626743] RBP: ffff8801c3ea7320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 49.633993] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8346430 [ 49.641243] R13: dffffc0000000000 R14: ffff8801c3ea72f8 R15: ffff8801c3ea7438 [ 49.648499] FS: 00000000016c1880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 49.656704] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.662565] CR2: 0000000020000080 CR3: 00000001c3c06000 CR4: 00000000001406f0 [ 49.669816] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.677065] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.684316] Call Trace: [ 49.686896] ? rb_insert_color+0x1460/0x1460 [ 49.691291] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 49.696219] ? mark_held_locks+0x130/0x130 [ 49.700441] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 49.706237] ? mark_held_locks+0x130/0x130 [ 49.710457] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 49.715738] ? mark_held_locks+0x130/0x130 [ 49.719977] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.725499] ? mark_held_locks+0x130/0x130 [ 49.729728] ? mark_page_accessed+0xcb0/0x2040 [ 49.734305] ? activate_page+0x1040/0x1040 [ 49.738519] ? activate_page+0x1040/0x1040 [ 49.742747] ? pagecache_get_page+0x2d8/0xf00 [ 49.747228] ? find_get_pages_contig+0x15b0/0x15b0 [ 49.752144] ? lock_downgrade+0x900/0x900 [ 49.756279] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 49.762067] ? mark_held_locks+0x130/0x130 [ 49.766298] ? depot_save_stack+0x292/0x470 [ 49.770615] ? mark_held_locks+0x130/0x130 [ 49.774846] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 49.780191] ? lock_downgrade+0x900/0x900 [ 49.784321] ? kasan_check_read+0x11/0x20 [ 49.788455] ? do_raw_spin_unlock+0xa7/0x2f0 [ 49.792855] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 49.797419] ? mark_held_locks+0x130/0x130 [ 49.801642] ? _raw_spin_unlock+0x2c/0x50 [ 49.805775] ? ext4_discard_preallocations+0x18a/0x13c0 [ 49.811121] ? trace_hardirqs_on+0xbd/0x310 [ 49.815426] ? ext4_exit_mballoc+0xc0/0xc0 [ 49.819832] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 49.824833] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 49.829571] ? modules_open+0xa0/0xa0 [ 49.833364] ? __es_tree_search.isra.12+0x1ba/0x220 [ 49.838369] ? __es_remove_extent+0x9a3/0xba0 [ 49.842849] ? mark_held_locks+0x130/0x130 [ 49.847064] ? lock_downgrade+0x900/0x900 [ 49.851190] ? ext4_es_scan+0x960/0x960 [ 49.855148] ? lock_release+0x970/0x970 [ 49.859104] ? trace_hardirqs_on+0xbd/0x310 [ 49.863406] ? kasan_check_read+0x11/0x20 [ 49.867551] ? clear_inode+0x114/0x3a0 [ 49.871421] ? do_raw_write_trylock+0x1c0/0x1c0 [ 49.876071] ? kasan_check_write+0x14/0x20 [ 49.880288] ? lock_acquire+0x1ed/0x520 [ 49.884246] ? integrity_inode_free+0x77/0x320 [ 49.888811] ? ext4_es_remove_extent+0x151/0x500 [ 49.893550] ? lock_release+0x970/0x970 [ 49.897510] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 49.902594] ? depot_save_stack+0x292/0x470 [ 49.906898] ? kasan_check_write+0x14/0x20 [ 49.911116] ? do_raw_write_lock+0xbd/0x1b0 [ 49.915450] integrity_inode_free+0x12f/0x320 [ 49.919934] security_inode_free+0x19/0x90 [ 49.924172] __destroy_inode+0x328/0x820 [ 49.928235] ? generic_update_time+0x450/0x450 [ 49.932800] ? evict+0x5d8/0x980 [ 49.936150] ? lock_downgrade+0x900/0x900 [ 49.940280] ? __inode_wait_for_writeback+0x2cf/0x380 [ 49.945458] destroy_inode+0xda/0x200 [ 49.949240] ? __destroy_inode+0x820/0x820 [ 49.953455] ? kasan_check_write+0x14/0x20 [ 49.957675] ? do_raw_spin_lock+0xc1/0x200 [ 49.961891] evict+0x5e0/0x980 [ 49.965066] ? jbd2_journal_stop+0x430/0x15d0 [ 49.969542] ? destroy_inode+0x200/0x200 [ 49.973586] ? do_raw_spin_lock+0xc1/0x200 [ 49.977823] ? iput+0x671/0xa90 [ 49.981090] ? lock_downgrade+0x900/0x900 [ 49.985219] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 49.990738] ? kasan_check_read+0x11/0x20 [ 49.994880] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 49.999444] ? lock_downgrade+0x900/0x900 [ 50.003575] ? ext4_ioctl+0x231b/0x4210 [ 50.007531] iput+0x679/0xa90 [ 50.010618] ? inode_add_lru+0x2a0/0x2a0 [ 50.014664] ? up_write+0x7b/0x220 [ 50.018186] ? up_read+0x110/0x110 [ 50.021703] ? up_read+0x110/0x110 [ 50.025225] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.030762] ? check_preemption_disabled+0x48/0x200 [ 50.035760] ext4_ioctl+0x236f/0x4210 [ 50.039559] ? ext4_ioctl_group_add+0x560/0x560 [ 50.044229] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 50.050010] ? kasan_check_read+0x11/0x20 [ 50.054149] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 50.059423] ? unwind_dump+0x190/0x190 [ 50.063298] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.068818] ? avc_has_extended_perms+0xab2/0x15a0 [ 50.073733] ? fpu__prepare_read+0x17/0x750 [ 50.078033] ? avc_ss_reset+0x190/0x190 [ 50.081990] ? save_stack+0xa9/0xd0 [ 50.085597] ? save_stack+0x43/0xd0 [ 50.089202] ? __kasan_slab_free+0x102/0x150 [ 50.093623] ? kasan_slab_free+0xe/0x10 [ 50.097585] ? kmem_cache_free+0x83/0x290 [ 50.101713] ? putname+0xf2/0x130 [ 50.105178] ? do_sys_open+0x54d/0x700 [ 50.109044] ? __x64_sys_openat+0x9d/0x100 [ 50.113263] ? do_syscall_64+0x1b9/0x820 [ 50.117304] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.122656] ? trace_hardirqs_off+0xb8/0x310 [ 50.127044] ? kasan_check_read+0x11/0x20 [ 50.131176] ? do_raw_spin_unlock+0xa7/0x2f0 [ 50.135570] ? ___might_sleep+0x1ed/0x300 [ 50.139712] ? arch_local_save_flags+0x40/0x40 [ 50.144275] ? kasan_check_write+0x14/0x20 [ 50.148492] ? trace_hardirqs_off+0xb8/0x310 [ 50.152885] ? ext4_ioctl_group_add+0x560/0x560 [ 50.157551] do_vfs_ioctl+0x1de/0x1720 [ 50.161420] ? ioctl_preallocate+0x300/0x300 [ 50.165817] ? selinux_file_mprotect+0x620/0x620 [ 50.170551] ? putname+0xf2/0x130 [ 50.173986] ? kmem_cache_free+0x21a/0x290 [ 50.178236] ? putname+0xf7/0x130 [ 50.181675] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.187192] ? security_file_ioctl+0x94/0xc0 [ 50.191586] ksys_ioctl+0xa9/0xd0 [ 50.195023] __x64_sys_ioctl+0x73/0xb0 [ 50.198896] do_syscall_64+0x1b9/0x820 [ 50.202767] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 50.208112] ? syscall_return_slowpath+0x5e0/0x5e0 [ 50.213023] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.217849] ? trace_hardirqs_on_caller+0x310/0x310 [ 50.222859] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 50.227859] ? prepare_exit_to_usermode+0x291/0x3b0 [ 50.232859] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.237685] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.242857] RIP: 0033:0x440009 [ 50.246047] 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 [ 50.264930] RSP: 002b:00007ffd22637e08 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 50.272620] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 50.279879] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 50.287136] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 50.294410] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 50.301673] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 50.308929] Modules linked in: [ 50.312260] ---[ end trace fa763859906a8d2b ]--- [ 50.317056] RIP: 0010:rb_erase+0x306/0x3710 [ 50.321386] 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 [ 50.340661] RSP: 0018:ffff8801c3ea6918 EFLAGS: 00010202 [ 50.346058] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 50.353702] RDX: 1ffff100387d4d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 50.360974] RBP: ffff8801c3ea7320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 50.368280] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8346430 [ 50.375568] R13: dffffc0000000000 R14: ffff8801c3ea72f8 R15: ffff8801c3ea7438 [ 50.382972] FS: 00000000016c1880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 50.391228] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.397201] CR2: 0000000020000080 CR3: 00000001c3c06000 CR4: 00000000001406f0 [ 50.404497] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.411796] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.419103] Kernel panic - not syncing: Fatal exception [ 50.425556] Kernel Offset: disabled [ 50.429267] Rebooting in 86400 seconds..