[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.100198] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.706983] random: sshd: uninitialized urandom read (32 bytes read) [ 25.072895] random: sshd: uninitialized urandom read (32 bytes read) [ 25.956536] random: sshd: uninitialized urandom read (32 bytes read) [ 26.108864] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 31.575507] random: sshd: uninitialized urandom read (32 bytes read) 2018/07/19 14:14:29 parsed 1 programs [ 33.341915] random: cc1: uninitialized urandom read (8 bytes read) 2018/07/19 14:14:32 executed programs: 0 [ 34.658834] IPVS: ftp: loaded support on port[0] = 21 [ 34.665616] IPVS: ftp: loaded support on port[0] = 21 [ 34.671167] IPVS: ftp: loaded support on port[0] = 21 [ 34.671728] IPVS: ftp: loaded support on port[0] = 21 [ 34.685452] IPVS: ftp: loaded support on port[0] = 21 [ 34.701967] IPVS: ftp: loaded support on port[0] = 21 [ 34.715808] IPVS: ftp: loaded support on port[0] = 21 [ 34.725136] IPVS: ftp: loaded support on port[0] = 21 [ 36.121771] kasan: CONFIG_KASAN_INLINE enabled [ 36.126634] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 36.132542] print_req_error: I/O error, dev loop3, sector 32048 [ 36.137765] general protection fault: 0000 [#1] SMP KASAN [ 36.143754] Buffer I/O error on dev loop3, logical block 4006, lost async page write [ 36.149245] CPU: 0 PID: 4799 Comm: syz-executor4 Not tainted 4.18.0-rc5+ #57 [ 36.149252] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.149276] RIP: 0010:loop_validate_file+0x247/0x470 [ 36.179592] Code: 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 2e 02 00 00 4d 8b a4 24 f0 00 00 00 49 8d bc 24 b8 01 00 00 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 03 02 00 00 4d 8b a4 24 b8 01 00 00 4c 89 e0 48 [ 36.198804] RSP: 0018:ffff8801acae7be0 EFLAGS: 00010202 [ 36.204160] RAX: 0000000000000037 RBX: dffffc0000000000 RCX: ffffffff84c24809 [ 36.211424] RDX: 0000000000000000 RSI: ffffffff84c24817 RDI: 00000000000001b8 [ 36.218764] RBP: ffff8801acae7c00 R08: ffff8801acb700c0 R09: ffffed003b5c46d6 [ 36.226032] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000 [ 36.233299] R13: ffff8801d289e300 R14: 0000000000000002 R15: ffff8801ad71ccc0 [ 36.240555] FS: 0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f7eecb40 [ 36.248760] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 36.254631] CR2: 00000000f7eebc20 CR3: 00000001ad6c5000 CR4: 00000000001406f0 [ 36.261887] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.269139] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.276396] Call Trace: [ 36.278975] lo_ioctl+0x54d/0x1d10 [ 36.282505] lo_compat_ioctl+0xbb/0x170 [ 36.286460] ? lo_ioctl+0x1d10/0x1d10 [ 36.290242] compat_blkdev_ioctl+0x3ca/0x1b30 [ 36.294719] ? bfq_create_group_hierarchy+0x120/0x120 [ 36.300072] ? __x32_compat_sys_get_robust_list+0x430/0x430 [ 36.305768] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.311293] ? bfq_create_group_hierarchy+0x120/0x120 [ 36.316468] __ia32_compat_sys_ioctl+0x221/0x640 [ 36.321210] do_fast_syscall_32+0x34d/0xfb2 [ 36.325521] ? do_int80_syscall_32+0x890/0x890 [ 36.330094] ? _raw_spin_unlock_irq+0x27/0x70 [ 36.334572] ? finish_task_switch+0x1d3/0x870 [ 36.339063] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.344599] ? syscall_return_slowpath+0x31d/0x5e0 [ 36.349521] ? sysret32_from_system_call+0x5/0x46 [ 36.354344] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.359173] entry_SYSENTER_compat+0x70/0x7f [ 36.363564] RIP: 0023:0xf7f32cb9 [ 36.366905] Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 36.386056] RSP: 002b:00000000f7eec0ac EFLAGS: 00000282 ORIG_RAX: 0000000000000036 [ 36.393754] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000004c00 [ 36.401023] RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000000 [ 36.408298] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 36.415552] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 36.422804] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 36.430059] Modules linked in: [ 36.433248] Dumping ftrace buffer: [ 36.436774] (ftrace buffer empty) [ 36.440520] ---[ end trace 2e80c5795804a42a ]--- [ 36.445295] RIP: 0010:loop_validate_file+0x247/0x470 [ 36.450414] Code: 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 2e 02 00 00 4d 8b a4 24 f0 00 00 00 49 8d bc 24 b8 01 00 00 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 03 02 00 00 4d 8b a4 24 b8 01 00 00 4c 89 e0 48 [ 36.469656] RSP: 0018:ffff8801acae7be0 EFLAGS: 00010202 [ 36.475048] RAX: 0000000000000037 RBX: dffffc0000000000 RCX: ffffffff84c24809 [ 36.482338] RDX: 0000000000000000 RSI: ffffffff84c24817 RDI: 00000000000001b8 [ 36.489612] RBP: ffff8801acae7c00 R08: ffff8801acb700c0 R09: ffffed003b5c46d6 [ 36.496891] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000 [ 36.504172] R13: ffff8801d289e300 R14: 0000000000000002 R15: ffff8801ad71ccc0 [ 36.511457] FS: 0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f7eecb40 [ 36.519693] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 36.525583] CR2: 00000000f7eebc20 CR3: 00000001ad6c5000 CR4: 00000000001406f0 [ 36.532873] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.540169] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.547450] Kernel panic - not syncing: Fatal exception [ 36.553476] Dumping ftrace buffer: [ 36.556997] (ftrace buffer empty) [ 36.560683] Kernel Offset: disabled [ 36.564290] Rebooting in 86400 seconds..