[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 10.051445] random: sshd: uninitialized urandom read (32 bytes read) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 11.506508] random: crng init done Warning: Permanently added '10.128.0.69' (ECDSA) to the list of known hosts. 2018/09/23 17:33:41 parsed 1 programs 2018/09/23 17:33:42 executed programs: 0 [ 62.803991] audit: type=1400 audit(1537724028.537:5): avc: denied { associate } for pid=2083 comm="syz-executor2" name="syz2" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1 2018/09/23 17:33:48 executed programs: 6 [ 63.041157] syz-executor3 (4748) used greatest stack depth: 23368 bytes left [ 66.527772] syz-executor2 (5645) used greatest stack depth: 22984 bytes left 2018/09/23 17:33:53 executed programs: 311 2018/09/23 17:33:58 executed programs: 626 [ 77.810409] ------------[ cut here ]------------ [ 77.815186] kernel BUG at fs/ext4/inode.c:2618! [ 77.819842] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 77.825177] Modules linked in: [ 77.828489] CPU: 1 PID: 2083 Comm: syz-executor2 Not tainted 4.9.128+ #41 [ 77.835388] task: ffff8801cdee17c0 task.stack: ffff8801cdd30000 [ 77.841419] RIP: 0010:[] [] mpage_prepare_extent_to_map+0x719/0x9a0 [ 77.851135] RSP: 0018:ffff8801cdd37688 EFLAGS: 00010293 [ 77.856557] RAX: ffff8801cdee17c0 RBX: ffffea00070c5380 RCX: 0000000000000000 [ 77.863800] RDX: 0000000000000000 RSI: ffffffff8169b409 RDI: ffffea00070c5390 [ 77.871049] RBP: ffff8801cdd37848 R08: ffff8801cdee2070 R09: 0000000000000001 [ 77.878316] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 [ 77.885588] R13: 0000000000000001 R14: dffffc0000000000 R15: ffff8801cdd379b0 [ 77.892843] FS: 0000000002176940(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 77.901048] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 77.906914] CR2: 00007fff3d293d2c CR3: 00000001ce78a000 CR4: 00000000001606b0 [ 77.914168] Stack: [ 77.916294] 1ffff10039ba6ee0 ffff8801cdd37720 ffff8801cdd379b8 ffff8801cdd379c0 [ 77.924320] 0000000200000246 0007ffffffffffff ffff8801c1bf4c78 000000010000000c [ 77.932326] 7fffffffffffffff ffff8801cdd37760 ffff8801cdd379c8 ffffed0039ba6f37 [ 77.940322] Call Trace: [ 77.942896] [] ? mpage_process_page_bufs+0x490/0x490 [ 77.949627] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 77.956448] [] ? check_preemption_disabled+0x3b/0x170 [ 77.963460] [] ext4_writepages+0xeee/0x2e00 [ 77.969410] [] ? do_writepages+0xef/0x1d0 [ 77.975186] [] ? __ext4_journal_stop+0xd1/0x1c0 [ 77.981498] [] ? do_syscall_64+0x19f/0x480 [ 77.987378] [] ? entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 77.994463] [] ? ext4_mark_inode_dirty+0xb40/0xb40 [ 78.001021] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 78.007949] [] ? __lock_acquire+0x654/0x4a10 [ 78.013989] [] ? ext4_mark_inode_dirty+0xb40/0xb40 [ 78.020575] [] do_writepages+0xef/0x1d0 [ 78.026175] [] ? page_writeback_cpu_online+0x20/0x20 [ 78.032903] [] ? trace_hardirqs_on+0x10/0x10 [ 78.038952] [] __filemap_fdatawrite_range+0x1a9/0x250 [ 78.045766] [] ? replace_page_cache_page+0x600/0x600 [ 78.052502] [] ? jbd2_journal_begin_ordered_truncate+0x9a/0x190 [ 78.060187] [] ? jbd2_journal_begin_ordered_truncate+0xc0/0x190 [ 78.067873] [] filemap_fdatawrite_range+0x2a/0x40 [ 78.074349] [] jbd2_journal_begin_ordered_truncate+0x133/0x190 [ 78.081959] [] ext4_evict_inode+0xd68/0x1230 [ 78.087993] [] ? _raw_spin_unlock+0x2c/0x50 [ 78.093956] [] ? ext4_journalled_write_end+0x1230/0x1230 [ 78.101033] [] evict+0x22e/0x4f0 [ 78.106040] [] ? ext4_statfs+0xbb0/0xbb0 [ 78.111723] [] iput+0x371/0x900 [ 78.116642] [] do_unlinkat+0x4d5/0x660 [ 78.122155] [] ? do_rmdir+0x3b0/0x3b0 [ 78.127582] [] ? SyS_umount+0x1b4/0xb90 [ 78.133183] [] ? SyS_newlstat+0x9b/0x100 [ 78.138868] [] ? SyS_newstat+0xf0/0xf0 [ 78.144382] [] ? do_syscall_64+0x48/0x480 [ 78.150156] [] ? SyS_unlinkat+0x80/0x80 [ 78.155753] [] SyS_unlink+0x1a/0x20 [ 78.161005] [] do_syscall_64+0x19f/0x480 [ 78.166691] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 78.173590] Code: fc ff ff 48 89 95 b0 fe ff ff e8 53 e6 c6 ff 48 8b 95 b0 fe ff ff 48 8d 42 ff e9 6f ff ff ff e8 3e e6 c6 ff 0f 0b e8 37 e6 c6 ff <0f> 0b 31 c0 89 85 b0 fe ff ff e8 28 e6 c6 ff 8b 85 18 ff ff ff [ 78.200687] RIP [] mpage_prepare_extent_to_map+0x719/0x9a0 [ 78.208081] RSP [ 78.212199] ---[ end trace 9ea9756de764a548 ]--- [ 78.217112] Kernel panic - not syncing: Fatal exception [ 78.222750] Kernel Offset: disabled [ 78.226361] Rebooting in 86400 seconds..