[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.371969] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.651208] random: sshd: uninitialized urandom read (32 bytes read) [ 22.973127] random: sshd: uninitialized urandom read (32 bytes read) [ 23.736370] random: sshd: uninitialized urandom read (32 bytes read) [ 23.871571] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. [ 29.369237] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.449564] WARNING: CPU: 0 PID: 4468 at include/net/sock.h:660 smc_unhash_sk+0x357/0x4b0 [ 29.457897] Kernel panic - not syncing: panic_on_warn set ... [ 29.457897] [ 29.465247] CPU: 0 PID: 4468 Comm: syz-executor696 Not tainted 4.18.0-rc3+ #131 [ 29.473016] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.482356] Call Trace: [ 29.484938] dump_stack+0x1c9/0x2b4 [ 29.488557] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.493727] panic+0x238/0x4e7 [ 29.496991] ? add_taint.cold.5+0x16/0x16 [ 29.501115] ? __warn.cold.8+0x148/0x1ba [ 29.505154] ? __warn.cold.8+0x117/0x1ba [ 29.509200] ? smc_unhash_sk+0x357/0x4b0 [ 29.513241] __warn.cold.8+0x163/0x1ba [ 29.517191] ? smc_unhash_sk+0x357/0x4b0 [ 29.521232] report_bug+0x252/0x2d0 [ 29.524849] do_error_trap+0x1fc/0x4d0 [ 29.528713] ? math_error+0x3e0/0x3e0 [ 29.532506] ? kasan_check_write+0x14/0x20 [ 29.536731] ? do_raw_spin_lock+0xc1/0x200 [ 29.540948] ? lock_acquire+0x1e4/0x540 [ 29.544901] ? smc_unhash_sk+0xd7/0x4b0 [ 29.548857] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.553935] do_invalid_op+0x1b/0x20 [ 29.557631] invalid_op+0x14/0x20 [ 29.561062] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 29.565703] Code: 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 88 00 00 00 48 81 c4 c0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 f9 16 18 fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 d3 ef 55 fa [ 29.584824] RSP: 0018:ffff8801ad60f480 EFLAGS: 00010293 [ 29.590164] RAX: ffff8801ac9102c0 RBX: ffff8801ac42d140 RCX: ffffffff8763f416 [ 29.597411] RDX: 0000000000000000 RSI: ffffffff8763f4d7 RDI: 0000000000000005 [ 29.604657] RBP: ffff8801ad60f568 R08: ffff8801ac9102c0 R09: ffffed0035885a38 [ 29.611903] R10: ffffed0035885a38 R11: ffff8801ac42d1c3 R12: 1ffff10035ac1e94 [ 29.619163] R13: ffff8801ad60f540 R14: ffffffff89938700 R15: ffff8801ac42d1c0 [ 29.626435] ? smc_unhash_sk+0x296/0x4b0 [ 29.630473] ? smc_unhash_sk+0x357/0x4b0 [ 29.634516] ? smc_rx_data_available+0x120/0x120 [ 29.639249] ? release_sock+0x1ec/0x2c0 [ 29.643206] ? do_raw_write_trylock+0x1c0/0x1c0 [ 29.648136] ? __release_sock+0x3a0/0x3a0 [ 29.652263] ? smc_release+0x2cb/0x680 [ 29.656141] ? trace_hardirqs_on+0xd/0x10 [ 29.660266] ? __local_bh_enable_ip+0x161/0x230 [ 29.664921] smc_release+0x3d1/0x680 [ 29.668623] __sock_release+0xd7/0x260 [ 29.672500] ? __sock_release+0x260/0x260 [ 29.676625] sock_close+0x19/0x20 [ 29.680065] __fput+0x355/0x8b0 [ 29.683335] ? fput+0x1a0/0x1a0 [ 29.686604] ? kasan_check_write+0x14/0x20 [ 29.690833] ? do_raw_spin_lock+0xc1/0x200 [ 29.695054] ____fput+0x15/0x20 [ 29.698328] task_work_run+0x1ec/0x2a0 [ 29.702195] ? task_work_cancel+0x250/0x250 [ 29.706500] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.712018] ? switch_task_namespaces+0xa2/0xd0 [ 29.716667] do_exit+0x1b08/0x2750 [ 29.720184] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 29.724754] ? mm_update_next_owner+0x9a0/0x9a0 [ 29.729409] ? release_sock+0x1ec/0x2c0 [ 29.733361] ? lock_downgrade+0x8f0/0x8f0 [ 29.737486] ? lock_downgrade+0x8f0/0x8f0 [ 29.741614] ? kasan_check_read+0x11/0x20 [ 29.745740] ? do_raw_spin_unlock+0xa7/0x2f0 [ 29.750133] ? release_sock+0x1ec/0x2c0 [ 29.754094] ? lock_downgrade+0x8f0/0x8f0 [ 29.758220] ? lock_downgrade+0x8f0/0x8f0 [ 29.762353] ? kasan_check_read+0x11/0x20 [ 29.766569] ? do_raw_spin_unlock+0xa7/0x2f0 [ 29.770956] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 29.775529] ? release_sock+0x1ec/0x2c0 [ 29.779483] ? trace_hardirqs_on+0xd/0x10 [ 29.783610] ? __local_bh_enable_ip+0x161/0x230 [ 29.788258] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.792642] ? release_sock+0x1ec/0x2c0 [ 29.796590] ? __release_sock+0x3a0/0x3a0 [ 29.800727] ? __local_bh_enable_ip+0x161/0x230 [ 29.805394] ? smc_sendmsg+0x2d5/0x370 [ 29.809259] ? smc_sendpage+0x1a0/0x1a0 [ 29.813218] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.818734] ? sock_sendmsg+0x5a/0x120 [ 29.822598] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.828112] ? __sys_sendto+0x475/0x670 [ 29.832066] ? __ia32_sys_getpeername+0xb0/0xb0 [ 29.836715] ? mem_cgroup_from_task+0xcb/0x1f0 [ 29.841287] ? __do_page_fault+0x664/0xe50 [ 29.845901] ? lock_downgrade+0x8f0/0x8f0 [ 29.850038] ? handle_mm_fault+0x55d/0xc80 [ 29.854263] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.860002] do_group_exit+0x177/0x440 [ 29.863989] ? mm_fault_error+0x380/0x380 [ 29.868119] ? __ia32_sys_exit+0x50/0x50 [ 29.872180] __x64_sys_exit_group+0x3e/0x50 [ 29.876487] do_syscall_64+0x1b9/0x820 [ 29.880369] ? syscall_return_slowpath+0x5e0/0x5e0 [ 29.885291] ? syscall_return_slowpath+0x31d/0x5e0 [ 29.890211] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 29.895258] ? prepare_exit_to_usermode+0x291/0x3b0 [ 29.900279] ? perf_trace_sys_enter+0xb10/0xb10 [ 29.904929] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.910189] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.915368] RIP: 0033:0x43ecc8 [ 29.918540] Code: Bad RIP value. [ 29.921894] RSP: 002b:00007ffe993ca018 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.929580] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ecc8 [ 29.936826] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.944082] RBP: 00000000004be588 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.951351] R10: 0000000020000010 R11: 0000000000000246 R12: 0000000000000001 [ 29.958602] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 29.966285] Dumping ftrace buffer: [ 29.969798] (ftrace buffer empty) [ 29.973757] Kernel Offset: disabled [ 29.977369] Rebooting in 86400 seconds..