[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.741660] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.845891] random: sshd: uninitialized urandom read (32 bytes read) [ 24.159716] random: sshd: uninitialized urandom read (32 bytes read) [ 25.047562] random: sshd: uninitialized urandom read (32 bytes read) [ 25.205577] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.46' (ECDSA) to the list of known hosts. [ 30.689643] random: sshd: uninitialized urandom read (32 bytes read) 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 30.844704] print_req_error: I/O error, dev loop3, sector 288 [ 30.850892] Buffer I/O error on dev loop3, logical block 36, lost async page write 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 [ 30.938050] print_req_error: I/O error, dev loop3, sector 0 executing program [ 30.979291] kasan: CONFIG_KASAN_INLINE enabled [ 30.981157] print_req_error: I/O error, dev loop3, sector 4096 [ 30.984168] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 30.984185] general protection fault: 0000 [#1] SMP KASAN [ 30.984197] CPU: 0 PID: 4659 Comm: syz-executor487 Not tainted 4.18.0-rc5+ #156 [ 30.984208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.019807] RIP: 0010:loop_validate_file+0x247/0x470 executing program executing program [ 31.024899] 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 [ 31.044137] RSP: 0018:ffff8801ac3df8f8 EFLAGS: 00010202 [ 31.049498] RAX: 0000000000000037 RBX: dffffc0000000000 RCX: ffffffff84c242d9 [ 31.056765] RDX: 0000000000000000 RSI: ffffffff84c242e7 RDI: 00000000000001b8 [ 31.064046] RBP: ffff8801ac3df918 R08: ffff8801d966e640 R09: ffffed003b5c46d6 [ 31.071301] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000 executing program executing program [ 31.078561] R13: ffff8801d24c1380 R14: 0000000000000002 R15: ffff8801d92eba00 [ 31.085810] FS: 00007fb12628e700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 31.094028] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.099891] CR2: 00007fb1262f0db8 CR3: 00000001ad211000 CR4: 00000000001406f0 [ 31.107150] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.114406] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.121663] Call Trace: [ 31.124244] lo_ioctl+0x54d/0x1d10 executing program executing program executing program [ 31.127771] ? lo_rw_aio_complete+0x450/0x450 [ 31.132275] blkdev_ioctl+0x9cd/0x2030 [ 31.136162] ? blkpg_ioctl+0xc40/0xc40 [ 31.140056] ? lock_downgrade+0x8f0/0x8f0 [ 31.144209] ? kasan_check_read+0x11/0x20 [ 31.148347] ? rcu_is_watching+0x8c/0x150 [ 31.152478] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 31.156880] ? __fget+0x414/0x670 [ 31.160327] ? expand_files.part.8+0x9c0/0x9c0 [ 31.164891] block_ioctl+0xee/0x130 [ 31.168506] ? blkdev_fallocate+0x400/0x400 [ 31.172820] do_vfs_ioctl+0x1de/0x1720 executing program executing program executing program executing program [ 31.176699] ? ioctl_preallocate+0x300/0x300 [ 31.181085] ? __fget_light+0x2f7/0x440 [ 31.185042] ? fget_raw+0x20/0x20 [ 31.188491] ? lock_downgrade+0x8f0/0x8f0 [ 31.192636] ? finish_task_switch+0x18a/0x870 [ 31.197122] ? security_file_ioctl+0x94/0xc0 [ 31.201511] ksys_ioctl+0xa9/0xd0 [ 31.204949] __x64_sys_ioctl+0x73/0xb0 [ 31.208830] do_syscall_64+0x1b9/0x820 [ 31.212712] ? finish_task_switch+0x1d3/0x870 [ 31.217197] ? syscall_return_slowpath+0x5e0/0x5e0 [ 31.222115] ? syscall_return_slowpath+0x31d/0x5e0 executing program executing program executing program [ 31.227043] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.232399] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.237229] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.242402] RIP: 0033:0x449e89 [ 31.245573] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 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 7b d2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 31.264711] RSP: 002b:00007fb12628dce8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010 [ 31.272406] RAX: ffffffffffffffda RBX: 00000000006dbc8c RCX: 0000000000449e89 executing program executing program executing program [ 31.279669] RDX: 0000000000000003 RSI: 0000000000004c00 RDI: 0000000000000007 [ 31.286931] RBP: 00000000006dbc88 R08: 00007fb12628e700 R09: 0000000000000000 [ 31.294186] R10: 00007fb12628e700 R11: 0000000000000206 R12: 0000000000000000 [ 31.301446] R13: 00007fff6ab7558f R14: 00007fb12628e9c0 R15: 0000000000000009 [ 31.308703] Modules linked in: [ 31.311886] Dumping ftrace buffer: [ 31.315401] (ftrace buffer empty) [ 31.319194] ---[ end trace d6d498549d11e4ff ]--- [ 31.324005] RIP: 0010:loop_validate_file+0x247/0x470 executing program executing program executing program executing program executing program [ 31.329150] 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 [ 31.348428] RSP: 0018:ffff8801ac3df8f8 EFLAGS: 00010202 [ 31.353829] RAX: 0000000000000037 RBX: dffffc0000000000 RCX: ffffffff84c242d9 [ 31.361120] RDX: 0000000000000000 RSI: ffffffff84c242e7 RDI: 00000000000001b8 [ 31.368394] RBP: ffff8801ac3df918 R08: ffff8801d966e640 R09: ffffed003b5c46d6 executing program executing program executing program executing program executing program executing program [ 31.375672] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000 [ 31.382973] R13: ffff8801d24c1380 R14: 0000000000000002 R15: ffff8801d92eba00 [ 31.390265] FS: 00007fb12628e700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 31.398510] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.404416] CR2: 00007fb1262f0db8 CR3: 00000001ad211000 CR4: 00000000001406f0 [ 31.411712] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.419012] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.426311] Kernel panic - not syncing: Fatal exception [ 31.432153] Dumping ftrace buffer: [ 31.435691] (ftrace buffer empty) [ 31.439384] Kernel Offset: disabled [ 31.442988] Rebooting in 86400 seconds..