[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.908093] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.879553] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.271912] random: sshd: uninitialized urandom read (32 bytes read) [ 21.113849] random: sshd: uninitialized urandom read (32 bytes read) [ 21.276808] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts. [ 26.761006] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.854579] tls_set_device_offload: netdev not found [ 26.870584] WARNING: CPU: 0 PID: 4519 at lib/iov_iter.c:918 iov_iter_revert+0x2ee/0xaa0 [ 26.878805] Kernel panic - not syncing: panic_on_warn set ... [ 26.878805] [ 26.886156] CPU: 0 PID: 4519 Comm: syz-executor775 Not tainted 4.17.0+ #94 [ 26.893161] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.902509] Call Trace: [ 26.905086] dump_stack+0x1b9/0x294 [ 26.908698] ? dump_stack_print_info.cold.2+0x52/0x52 [ 26.913874] ? iov_iter_revert+0x240/0xaa0 [ 26.918091] panic+0x22f/0x4de [ 26.921265] ? add_taint.cold.5+0x16/0x16 [ 26.925405] ? __warn.cold.8+0x148/0x1b3 [ 26.929449] ? __warn.cold.8+0x117/0x1b3 [ 26.933505] ? iov_iter_revert+0x2ee/0xaa0 [ 26.937723] __warn.cold.8+0x163/0x1b3 [ 26.941590] ? iov_iter_revert+0x2ee/0xaa0 [ 26.945819] report_bug+0x252/0x2d0 [ 26.949432] do_error_trap+0x1fc/0x4d0 [ 26.953315] ? math_error+0x3f0/0x3f0 [ 26.957104] ? sock_def_error_report+0x2f2/0x710 [ 26.961844] ? sock_def_readable+0x710/0x710 [ 26.966249] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.971086] do_invalid_op+0x1b/0x20 [ 26.974780] invalid_op+0x14/0x20 [ 26.978653] RIP: 0010:iov_iter_revert+0x2ee/0xaa0 [ 26.983761] Code: 74 24 08 4d 89 7d 20 48 89 de 49 83 c7 01 4c 89 f7 e8 76 50 24 fe 49 39 de 72 b7 e8 bc 4f 24 fe e9 3b ff ff ff e8 b2 4f 24 fe <0f> 0b e9 3a ff ff ff e8 a6 4f 24 fe 49 8d 7d 18 48 b8 00 00 00 00 [ 27.002941] RSP: 0018:ffff8801b05c7788 EFLAGS: 00010293 [ 27.008288] RAX: ffff8801b0972080 RBX: 00000000fffffeee RCX: ffffffff8355eb01 [ 27.015539] RDX: 0000000000000000 RSI: ffffffff8355edae RDI: 0000000000000007 [ 27.022796] RBP: ffff8801b05c77e8 R08: ffff8801b0972080 R09: ffffed003b5c46d6 [ 27.030077] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000112 [ 27.037358] R13: ffff8801b05c7ad0 R14: 0000000000000478 R15: ffff8801b2f66040 [ 27.044627] ? iov_iter_revert+0x41/0xaa0 [ 27.048863] ? iov_iter_revert+0x2ee/0xaa0 [ 27.053083] ? iov_iter_revert+0x2ee/0xaa0 [ 27.057306] tls_sw_sendmsg+0xefc/0x12b0 [ 27.061360] ? generic_pipe_buf_nosteal+0x10/0x10 [ 27.066205] ? tls_sw_push_pending_record+0x30/0x30 [ 27.071222] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 27.076228] ? __atime_needs_update+0x453/0xd10 [ 27.080910] ? debug_check_no_locks_freed+0x310/0x310 [ 27.086094] inet_sendmsg+0x19f/0x690 [ 27.089880] ? ipip_gro_receive+0x100/0x100 [ 27.094198] ? __atime_needs_update+0xd10/0xd10 [ 27.098860] ? do_splice_direct+0x400/0x400 [ 27.103169] ? security_socket_sendmsg+0x94/0xc0 [ 27.107915] ? ipip_gro_receive+0x100/0x100 [ 27.112220] sock_sendmsg+0xd5/0x120 [ 27.115937] sock_write_iter+0x35a/0x5a0 [ 27.119994] ? sock_sendmsg+0x120/0x120 [ 27.123958] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.129488] ? iov_iter_init+0xc9/0x1f0 [ 27.133455] __vfs_write+0x6ae/0x9d0 [ 27.137151] ? kernel_read+0x120/0x120 [ 27.141048] ? lock_downgrade+0x8e0/0x8e0 [ 27.145184] ? rw_verify_area+0x118/0x360 [ 27.149355] vfs_write+0x1f8/0x560 [ 27.152898] ksys_write+0xf9/0x250 [ 27.156424] ? __ia32_sys_read+0xb0/0xb0 [ 27.160479] ? __ia32_sys_sendfile+0x290/0x290 [ 27.165048] __x64_sys_write+0x73/0xb0 [ 27.168923] do_syscall_64+0x1b1/0x800 [ 27.172806] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 27.177635] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.182556] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.187572] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.192928] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.197767] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.202943] RIP: 0033:0x440a69 [ 27.206121] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 27.225353] RSP: 002b:00007ffe80fca8a8 EFLAGS: 00000207 ORIG_RAX: 0000000000000001 [ 27.233077] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440a69 [ 27.240341] RDX: 0000000000000478 RSI: 0000000020000740 RDI: 0000000000000003 [ 27.247597] RBP: 00000000006cb018 R08: 65732f636f72702f R09: 65732f636f72702f [ 27.254850] R10: 000000000000000f R11: 0000000000000207 R12: 00000000004022f0 [ 27.262116] R13: 0000000000402380 R14: 0000000000000000 R15: 0000000000000000 [ 27.270308] Dumping ftrace buffer: [ 27.274028] (ftrace buffer empty) [ 27.277722] Kernel Offset: disabled [ 27.281349] Rebooting in 86400 seconds..