[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.250238] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.932908] random: sshd: uninitialized urandom read (32 bytes read) [ 25.385879] random: sshd: uninitialized urandom read (32 bytes read) [ 26.123242] random: sshd: uninitialized urandom read (32 bytes read) [ 26.287871] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. [ 31.695982] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.792868] WARNING: CPU: 0 PID: 4549 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.801272] Kernel panic - not syncing: panic_on_warn set ... [ 31.801272] [ 31.808625] CPU: 0 PID: 4549 Comm: syz-executor006 Not tainted 4.17.0-rc2+ #28 [ 31.815963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.825314] Call Trace: [ 31.827895] dump_stack+0x1b9/0x294 [ 31.831505] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.836683] ? smc_unhash_sk+0x2b0/0x4a0 [ 31.840738] panic+0x22f/0x4de [ 31.843916] ? add_taint.cold.5+0x16/0x16 [ 31.848151] ? __warn.cold.8+0x148/0x1b3 [ 31.852194] ? __warn.cold.8+0x117/0x1b3 [ 31.856263] ? smc_unhash_sk+0x345/0x4a0 [ 31.860306] __warn.cold.8+0x163/0x1b3 [ 31.864185] ? smc_unhash_sk+0x345/0x4a0 [ 31.868242] report_bug+0x252/0x2d0 [ 31.871862] do_error_trap+0x1de/0x490 [ 31.875750] ? graph_lock+0x170/0x170 [ 31.881634] ? math_error+0x420/0x420 [ 31.885433] ? lock_acquire+0x1dc/0x520 [ 31.889414] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.894240] do_invalid_op+0x1b/0x20 [ 31.897938] invalid_op+0x14/0x20 [ 31.901375] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.906019] RSP: 0018:ffff8801d935f488 EFLAGS: 00010293 [ 31.911371] RAX: ffff8801ac01a600 RBX: ffff8801d8fc27c0 RCX: ffffffff873fc8de [ 31.918621] RDX: 0000000000000000 RSI: ffffffff873fc995 RDI: 0000000000000005 [ 31.926071] RBP: ffff8801d935f570 R08: ffff8801ac01a600 R09: ffffed003b1f8508 [ 31.933773] R10: ffffed003b1f8508 R11: ffff8801d8fc2843 R12: 1ffff1003b26be95 [ 31.941039] R13: ffff8801d935f548 R14: ffffffff8970e060 R15: ffff8801d8fc2840 [ 31.948491] ? smc_unhash_sk+0x28e/0x4a0 [ 31.952547] ? smc_unhash_sk+0x345/0x4a0 [ 31.956598] ? smc_unhash_sk+0x345/0x4a0 [ 31.960647] ? smc_hash_sk+0x2f0/0x2f0 [ 31.964520] ? release_sock+0x1e2/0x2b0 [ 31.968477] ? __local_bh_enable_ip+0x161/0x230 [ 31.973126] ? __release_sock+0x3a0/0x3a0 [ 31.977259] ? smc_release+0x269/0x610 [ 31.981132] ? trace_hardirqs_on+0xd/0x10 [ 31.985275] ? __local_bh_enable_ip+0x161/0x230 [ 31.989935] smc_release+0x36e/0x610 [ 31.993637] sock_release+0x96/0x1b0 [ 31.997335] ? sock_alloc_file+0x4e0/0x4e0 [ 32.001556] sock_close+0x16/0x20 [ 32.004991] __fput+0x34d/0x890 [ 32.008253] ? fput+0x1a0/0x1a0 [ 32.011517] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.015994] ____fput+0x15/0x20 [ 32.019257] task_work_run+0x1e4/0x290 [ 32.023132] ? task_work_cancel+0x240/0x240 [ 32.027443] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.032975] ? switch_task_namespaces+0xa2/0xd0 [ 32.037644] do_exit+0x1aee/0x2730 [ 32.041178] ? mm_update_next_owner+0x980/0x980 [ 32.045827] ? kasan_check_write+0x14/0x20 [ 32.050045] ? do_raw_spin_lock+0xc1/0x200 [ 32.054259] ? trace_hardirqs_off+0xd/0x10 [ 32.058480] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 32.063567] ? debug_check_no_obj_freed+0x2ff/0x584 [ 32.068571] ? __local_bh_enable_ip+0x161/0x230 [ 32.073235] ? kasan_check_read+0x11/0x20 [ 32.077366] ? rcu_is_watching+0x85/0x140 [ 32.081495] ? rcu_pm_notify+0xc0/0xc0 [ 32.085366] ? ___sys_sendmsg+0x31a/0x940 [ 32.089501] ? kfree+0x1e9/0x260 [ 32.092856] ? ___sys_sendmsg+0x31f/0x940 [ 32.096992] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.102514] ? copy_msghdr_from_user+0x560/0x560 [ 32.107266] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 32.112006] ? graph_lock+0x170/0x170 [ 32.115797] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.121315] ? __fget_light+0x2ef/0x430 [ 32.125307] ? fget_raw+0x20/0x20 [ 32.128745] ? find_held_lock+0x36/0x1c0 [ 32.132814] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.138435] ? sockfd_lookup_light+0xc5/0x160 [ 32.142917] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.148440] ? __sys_sendmsg+0x1aa/0x270 [ 32.152483] ? __ia32_sys_shutdown+0x80/0x80 [ 32.156889] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.162518] ? __do_page_fault+0x441/0xe40 [ 32.166752] do_group_exit+0x16f/0x430 [ 32.170626] ? __ia32_sys_exit+0x50/0x50 [ 32.174691] ? do_syscall_64+0x92/0x800 [ 32.178658] __x64_sys_exit_group+0x3e/0x50 [ 32.182964] do_syscall_64+0x1b1/0x800 [ 32.186838] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.191665] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.196579] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.201497] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.206843] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.211690] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.216860] RIP: 0033:0x43ead8 [ 32.220028] RSP: 002b:00007ffd3ca5e228 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.227731] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ead8 [ 32.234983] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.242245] RBP: 00000000004be4c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.249518] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 32.256788] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.264689] Dumping ftrace buffer: [ 32.268349] (ftrace buffer empty) [ 32.272039] Kernel Offset: disabled [ 32.275647] Rebooting in 86400 seconds..