[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 38.957744] random: sshd: uninitialized urandom read (32 bytes read) [ 39.463196] kauditd_printk_skb: 10 callbacks suppressed [ 39.463204] audit: type=1400 audit(1576658552.123:35): avc: denied { map } for pid=7064 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 [ 39.518478] random: sshd: uninitialized urandom read (32 bytes read) [ 40.086111] random: sshd: uninitialized urandom read (32 bytes read) [ 40.267482] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.253' (ECDSA) to the list of known hosts. [ 45.936180] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program [ 46.051414] audit: type=1400 audit(1576658558.713:36): avc: denied { map } for pid=7076 comm="syz-executor073" path="/root/syz-executor073739644" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 46.570983] ------------[ cut here ]------------ [ 46.576115] kernel BUG at fs/buffer.c:3111! [ 46.576316] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 46.580793] kobject: 'loop5' (ffff8880a4200ee0): fill_kobj_path: path = '/devices/virtual/block/loop5' [ 46.588736] Modules linked in: [ 46.588749] CPU: 1 PID: 7099 Comm: syz-executor073 Not tainted 4.14.159-syzkaller #0 [ 46.588753] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.588757] task: ffff88809bed6640 task.stack: ffff888099b58000 [ 46.588768] RIP: 0010:submit_bh_wbc+0x5a0/0x720 [ 46.588775] RSP: 0018:ffff888099b5fa38 EFLAGS: 00010297 [ 46.635875] RAX: ffff88809bed6640 RBX: ffff88808ff60930 RCX: 0000000000000000 [ 46.643564] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000000000000001 [ 46.650837] RBP: ffff888099b5fa80 R08: 0000000000000000 R09: 0000000000000001 [ 46.658178] R10: 0000000000000000 R11: ffff88809bed6640 R12: ffff88808ff60930 [ 46.666142] R13: 0000000000000800 R14: 0000000000000000 R15: 0000000000000001 [ 46.673396] FS: 0000000001e39940(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 [ 46.682036] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.687914] CR2: 0000000001f8d008 CR3: 00000000a9b9f000 CR4: 00000000001406e0 [ 46.695173] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.702444] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.709793] Call Trace: [ 46.712370] __sync_dirty_buffer+0xcf/0x260 [ 46.717076] sync_dirty_buffer+0x1b/0x20 [ 46.721872] fat_set_state+0x1f5/0x2e0 [ 46.725796] fat_fill_super+0x1e90/0x3560 [ 46.729931] ? fat_flush_inodes+0x170/0x170 [ 46.734241] ? pointer+0xb10/0xb10 [ 46.737774] ? snprintf+0xa5/0xd0 [ 46.741220] ? vsprintf+0x40/0x40 [ 46.744661] ? set_blocksize+0x270/0x300 [ 46.749512] ? set_bdev_super+0x120/0x120 [ 46.753831] vfat_fill_super+0x32/0x40 [ 46.757716] mount_bdev+0x2be/0x370 [ 46.761320] ? vfat_mount+0x40/0x40 [ 46.765984] vfat_mount+0x35/0x40 [ 46.769505] mount_fs+0x97/0x2a1 [ 46.772862] vfs_kern_mount.part.0+0x5e/0x3d0 [ 46.777422] do_mount+0x417/0x27d0 [ 46.780941] ? copy_mount_options+0x5c/0x2f0 [ 46.785441] ? rcu_read_lock_sched_held+0x110/0x130 [ 46.790537] ? copy_mount_string+0x40/0x40 [ 46.794777] ? copy_mount_options+0x1fe/0x2f0 [ 46.799433] SyS_mount+0xab/0x120 [ 46.802868] ? copy_mnt_ns+0x8c0/0x8c0 [ 46.806753] do_syscall_64+0x1e8/0x640 [ 46.810623] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.815454] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 46.820622] RIP: 0033:0x4487aa [ 46.823809] RSP: 002b:00007ffe2d6cff58 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5 [ 46.831501] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004487aa [ 46.838858] RDX: 00007ffe2d6cffa0 RSI: 00000000200002c0 RDI: 00007ffe2d6cffc0 [ 46.846116] RBP: 0000000000000000 R08: 00007ffe2d6d0000 R09: 0000000000000000 [ 46.853390] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000402f60 [ 46.860640] R13: 0000000000402ff0 R14: 0000000000000000 R15: 0000000000000000 [ 46.867897] Code: f0 80 63 01 f7 e9 3d fb ff ff 48 8d 43 20 48 89 45 d0 48 8d 43 10 48 89 45 c0 e9 34 fc ff ff e8 87 3a c1 ff 0f 0b e8 80 3a c1 ff <0f> 0b e8 79 3a c1 ff 0f 0b e8 72 3a c1 ff 0f 0b e8 6b 3a c1 ff [ 46.887004] RIP: submit_bh_wbc+0x5a0/0x720 RSP: ffff888099b5fa38 [ 46.893660] ---[ end trace eb01e1d9005bc5c1 ]--- [ 46.898456] Kernel panic - not syncing: Fatal exception [ 46.905187] Kernel Offset: disabled [ 46.908811] Rebooting in 86400 seconds..