[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.548382] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.272762] random: sshd: uninitialized urandom read (32 bytes read) [ 23.604578] random: sshd: uninitialized urandom read (32 bytes read) [ 24.453123] random: sshd: uninitialized urandom read (32 bytes read) [ 24.624112] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.49' (ECDSA) to the list of known hosts. [ 30.135827] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.228524] WARNING: CPU: 0 PID: 4538 at include/net/sock.h:644 smc_unhash_sk+0x357/0x4b0 [ 30.236909] Kernel panic - not syncing: panic_on_warn set ... [ 30.236909] [ 30.244267] CPU: 0 PID: 4538 Comm: syz-executor984 Not tainted 4.18.0-rc2+ #98 [ 30.251623] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.260951] Call Trace: [ 30.263521] dump_stack+0x1c9/0x2b4 [ 30.267127] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.272309] panic+0x238/0x4e7 [ 30.275480] ? add_taint.cold.5+0x16/0x16 [ 30.279610] ? __warn.cold.8+0x148/0x1ba [ 30.283646] ? __warn.cold.8+0x117/0x1ba [ 30.287698] ? smc_unhash_sk+0x357/0x4b0 [ 30.291749] __warn.cold.8+0x163/0x1ba [ 30.295625] ? smc_unhash_sk+0x357/0x4b0 [ 30.299676] report_bug+0x252/0x2d0 [ 30.303286] do_error_trap+0x1fc/0x4d0 [ 30.307154] ? math_error+0x3e0/0x3e0 [ 30.310937] ? print_usage_bug+0xc0/0xc0 [ 30.314982] ? lock_acquire+0x1e4/0x540 [ 30.318941] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.323773] do_invalid_op+0x1b/0x20 [ 30.327472] invalid_op+0x14/0x20 [ 30.330907] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 30.335548] 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 19 92 1b fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 a3 65 59 fa [ 30.354708] RSP: 0018:ffff8801ac997480 EFLAGS: 00010293 [ 30.360052] RAX: ffff8801acbb0080 RBX: ffff8801acc88800 RCX: ffffffff87607996 [ 30.367298] RDX: 0000000000000000 RSI: ffffffff87607a57 RDI: 0000000000000005 [ 30.374546] RBP: ffff8801ac997568 R08: ffff8801acbb0080 R09: ffffed0035991110 [ 30.381797] R10: ffffed0035991110 R11: ffff8801acc88883 R12: 1ffff10035932e94 [ 30.389047] R13: ffff8801ac997540 R14: ffffffff89935460 R15: ffff8801acc88880 [ 30.396301] ? smc_unhash_sk+0x296/0x4b0 [ 30.400338] ? smc_unhash_sk+0x357/0x4b0 [ 30.404383] ? smc_rx_data_available+0x120/0x120 [ 30.409116] ? release_sock+0x1ec/0x2c0 [ 30.413072] ? __local_bh_enable_ip+0x161/0x230 [ 30.417718] ? __release_sock+0x3a0/0x3a0 [ 30.421851] ? smc_release+0x269/0x610 [ 30.425721] ? trace_hardirqs_on+0xd/0x10 [ 30.429859] ? __local_bh_enable_ip+0x161/0x230 [ 30.434510] smc_release+0x36e/0x610 [ 30.438207] __sock_release+0xd7/0x260 [ 30.442073] ? __sock_release+0x260/0x260 [ 30.446205] sock_close+0x19/0x20 [ 30.449636] __fput+0x35b/0x8b0 [ 30.452897] ? fput+0x1a0/0x1a0 [ 30.456157] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.460631] ____fput+0x15/0x20 [ 30.463896] task_work_run+0x1ec/0x2a0 [ 30.467764] ? task_work_cancel+0x250/0x250 [ 30.472069] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.477584] ? switch_task_namespaces+0xa2/0xd0 [ 30.482232] do_exit+0x1b08/0x2750 [ 30.485754] ? mm_update_next_owner+0x9a0/0x9a0 [ 30.490407] ? find_held_lock+0x36/0x1c0 [ 30.494451] ? lock_downgrade+0x8f0/0x8f0 [ 30.498581] ? lock_downgrade+0x8f0/0x8f0 [ 30.502718] ? kasan_check_read+0x11/0x20 [ 30.506843] ? do_raw_spin_unlock+0xa7/0x2f0 [ 30.511232] ? __local_bh_enable_ip+0x161/0x230 [ 30.515891] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.520885] ? release_sock+0x1ec/0x2c0 [ 30.524838] ? trace_hardirqs_on+0xd/0x10 [ 30.528972] ? __local_bh_enable_ip+0x161/0x230 [ 30.533629] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.538016] ? release_sock+0x1ec/0x2c0 [ 30.541976] ? __release_sock+0x3a0/0x3a0 [ 30.546101] ? __local_bh_enable_ip+0x161/0x230 [ 30.550751] ? smc_sendmsg+0x2d5/0x370 [ 30.554625] ? smc_sendpage+0x1a0/0x1a0 [ 30.558579] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.564095] ? sock_sendmsg+0x5a/0x120 [ 30.567961] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.573473] ? __sys_sendto+0x475/0x670 [ 30.577426] ? __ia32_sys_getpeername+0xb0/0xb0 [ 30.582076] ? lock_downgrade+0x8f0/0x8f0 [ 30.586214] ? handle_mm_fault+0x8c4/0xc80 [ 30.590440] ? handle_mm_fault+0x55d/0xc80 [ 30.594662] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.600181] do_group_exit+0x177/0x440 [ 30.604055] ? mm_fault_error+0x380/0x380 [ 30.608341] ? __ia32_sys_exit+0x50/0x50 [ 30.612401] ? do_syscall_64+0x9a/0x820 [ 30.616355] __x64_sys_exit_group+0x3e/0x50 [ 30.620660] do_syscall_64+0x1b9/0x820 [ 30.624547] ? syscall_return_slowpath+0x5e0/0x5e0 [ 30.629457] ? syscall_return_slowpath+0x31d/0x5e0 [ 30.634371] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.639714] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.644644] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.649816] RIP: 0033:0x43e918 [ 30.652980] Code: Bad RIP value. [ 30.656340] RSP: 002b:00007ffc05e9ed78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.664038] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e918 [ 30.671300] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.678548] RBP: 00000000004be2c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.685806] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 30.693053] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.700856] Dumping ftrace buffer: [ 30.704464] (ftrace buffer empty) [ 30.708157] Kernel Offset: disabled [ 30.711771] Rebooting in 86400 seconds..