[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 36.862020] random: sshd: uninitialized urandom read (32 bytes read) [ 37.211937] kauditd_printk_skb: 9 callbacks suppressed [ 37.211945] audit: type=1400 audit(1560105406.340:35): avc: denied { map } for pid=6857 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 [ 37.266793] random: sshd: uninitialized urandom read (32 bytes read) [ 37.781478] random: sshd: uninitialized urandom read (32 bytes read) [ 37.964375] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. [ 43.547905] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 43.659463] audit: type=1400 audit(1560105412.780:36): avc: denied { map } for pid=6869 comm="syz-executor945" path="/root/syz-executor945611094" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 43.664144] kasan: CONFIG_KASAN_INLINE enabled [ 43.691605] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 43.699083] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 43.705296] Modules linked in: [ 43.708539] CPU: 0 PID: 6869 Comm: syz-executor945 Not tainted 4.14.124 #18 [ 43.715626] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.724965] task: ffff888094a12440 task.stack: ffff888097290000 [ 43.731006] RIP: 0010:refcount_sub_and_test+0x2b/0xf0 [ 43.736236] RSP: 0018:ffff888097297a68 EFLAGS: 00010202 [ 43.741593] RAX: dffffc0000000000 RBX: ffff8880933a8a00 RCX: ffffffff8424bba0 [ 43.748846] RDX: 0000000000000004 RSI: 0000000000000020 RDI: 0000000000000001 [ 43.756092] RBP: ffff888097297a90 R08: 00000000561284a3 R09: ffff888094a12d08 [ 43.763352] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000020 [ 43.770605] R13: 0000000000000001 R14: ffff8880933a8a14 R15: 0000000000000000 [ 43.777866] FS: 0000000001a58880(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 [ 43.786084] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.791959] CR2: 000000000043ea00 CR3: 000000000766a000 CR4: 00000000001406f0 [ 43.799286] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.806617] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.813919] Call Trace: [ 43.816502] refcount_dec_and_test+0x1b/0x20 [ 43.820905] vb2_vmalloc_put+0x18/0x70 [ 43.824788] __vb2_buf_mem_free+0x103/0x1e0 [ 43.829115] ? vb2_vmalloc_dmabuf_ops_attach+0x3f0/0x3f0 [ 43.834566] __vb2_queue_free+0x634/0x7d0 [ 43.838699] vb2_core_queue_release+0x64/0x80 [ 43.843189] _vb2_fop_release+0x1cf/0x2a0 [ 43.847391] vb2_fop_release+0x75/0xc0 [ 43.851266] vivid_fop_release+0x180/0x3f0 [ 43.855481] ? vivid_remove+0x3d0/0x3d0 [ 43.859498] ? dev_debug_store+0xe0/0xe0 [ 43.863561] v4l2_release+0xf9/0x190 [ 43.867262] __fput+0x275/0x7a0 [ 43.870527] ____fput+0x16/0x20 [ 43.873788] task_work_run+0x114/0x190 [ 43.877655] do_exit+0x7df/0x2c10 [ 43.881097] ? do_vfs_ioctl+0xef/0x1060 [ 43.885063] ? ioctl_preallocate+0x1c0/0x1c0 [ 43.889453] ? putname+0x11/0x120 [ 43.892942] ? mm_update_next_owner+0x5d0/0x5d0 [ 43.897606] ? do_sys_open+0x221/0x430 [ 43.901485] do_group_exit+0x111/0x330 [ 43.905351] SyS_exit_group+0x1d/0x20 [ 43.909125] ? do_group_exit+0x330/0x330 [ 43.913163] do_syscall_64+0x1e8/0x640 [ 43.917095] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.921936] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 43.927119] RIP: 0033:0x442e88 [ 43.930288] RSP: 002b:00007ffd45432c28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 43.938083] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442e88 [ 43.945353] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 43.952602] RBP: 00000000004c27a8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 43.959849] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 43.967205] R13: 00000000006d4180 R14: 0000000000000000 R15: 0000000000000000 [ 43.974468] Code: 55 48 89 e5 41 56 41 55 41 89 fd 41 54 49 89 f4 53 48 83 ec 08 e8 f6 c4 85 fe 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 [ 43.993651] RIP: refcount_sub_and_test+0x2b/0xf0 RSP: ffff888097297a68 [ 44.000757] ---[ end trace 0c039e45dabf2113 ]--- [ 44.005527] Kernel panic - not syncing: Fatal exception [ 44.011996] Kernel Offset: disabled [ 44.015618] Rebooting in 86400 seconds..