[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.055342] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.427534] random: sshd: uninitialized urandom read (32 bytes read) [ 22.669664] random: sshd: uninitialized urandom read (32 bytes read) [ 23.381986] random: sshd: uninitialized urandom read (32 bytes read) [ 23.517474] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 28.989944] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.072394] WARNING: CPU: 1 PID: 4472 at include/net/sock.h:660 smc_unhash_sk+0x357/0x4b0 [ 29.080735] Kernel panic - not syncing: panic_on_warn set ... [ 29.080735] [ 29.088089] CPU: 1 PID: 4472 Comm: syz-executor029 Not tainted 4.18.0-rc3+ #122 [ 29.095529] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.104865] Call Trace: [ 29.107446] dump_stack+0x1c9/0x2b4 [ 29.111055] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.116232] panic+0x238/0x4e7 [ 29.119408] ? add_taint.cold.5+0x16/0x16 [ 29.123539] ? __warn.cold.8+0x148/0x1ba [ 29.127592] ? __warn.cold.8+0x117/0x1ba [ 29.131639] ? smc_unhash_sk+0x357/0x4b0 [ 29.135714] __warn.cold.8+0x163/0x1ba [ 29.139585] ? smc_unhash_sk+0x357/0x4b0 [ 29.143632] report_bug+0x252/0x2d0 [ 29.147244] do_error_trap+0x1fc/0x4d0 [ 29.151464] ? math_error+0x3e0/0x3e0 [ 29.155256] ? kasan_check_write+0x14/0x20 [ 29.159479] ? do_raw_spin_lock+0xc1/0x200 [ 29.163696] ? lock_acquire+0x1e4/0x540 [ 29.167649] ? smc_unhash_sk+0xd7/0x4b0 [ 29.171607] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.176431] do_invalid_op+0x1b/0x20 [ 29.180141] invalid_op+0x14/0x20 [ 29.183575] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 29.188215] 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 a9 54 18 fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 83 2d 56 fa [ 29.207346] RSP: 0018:ffff8801acbf7480 EFLAGS: 00010293 [ 29.212708] RAX: ffff8801aeacc500 RBX: ffff8801add29140 RCX: ffffffff8763b666 [ 29.219972] RDX: 0000000000000000 RSI: ffffffff8763b727 RDI: 0000000000000005 [ 29.227227] RBP: ffff8801acbf7568 R08: ffff8801aeacc500 R09: ffffed0035ba5238 [ 29.234494] R10: ffffed0035ba5238 R11: ffff8801add291c3 R12: 1ffff1003597ee94 [ 29.241765] R13: ffff8801acbf7540 R14: ffffffff899381a0 R15: ffff8801add291c0 [ 29.249040] ? smc_unhash_sk+0x296/0x4b0 [ 29.253087] ? smc_unhash_sk+0x357/0x4b0 [ 29.257169] ? smc_rx_data_available+0x120/0x120 [ 29.261946] ? release_sock+0x1ec/0x2c0 [ 29.265931] ? do_raw_write_trylock+0x1c0/0x1c0 [ 29.270620] ? __release_sock+0x3a0/0x3a0 [ 29.274772] ? smc_release+0x2cb/0x680 [ 29.278657] ? trace_hardirqs_on+0xd/0x10 [ 29.282803] ? __local_bh_enable_ip+0x161/0x230 [ 29.287471] smc_release+0x3d1/0x680 [ 29.291174] __sock_release+0xd7/0x260 [ 29.295052] ? __sock_release+0x260/0x260 [ 29.299197] sock_close+0x19/0x20 [ 29.302649] __fput+0x355/0x8b0 [ 29.305922] ? fput+0x1a0/0x1a0 [ 29.309203] ? kasan_check_write+0x14/0x20 [ 29.313442] ? do_raw_spin_lock+0xc1/0x200 [ 29.317674] ____fput+0x15/0x20 [ 29.320954] task_work_run+0x1ec/0x2a0 [ 29.324838] ? task_work_cancel+0x250/0x250 [ 29.329150] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.334693] ? switch_task_namespaces+0xa2/0xd0 [ 29.339375] do_exit+0x1b08/0x2750 [ 29.342924] ? mm_update_next_owner+0x9a0/0x9a0 [ 29.347587] ? trace_hardirqs_on+0x10/0x10 [ 29.351814] ? trace_hardirqs_on+0x10/0x10 [ 29.356057] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 29.360636] ? kasan_check_write+0x14/0x20 [ 29.364854] ? do_raw_spin_lock+0xc1/0x200 [ 29.369070] ? _raw_spin_unlock+0x22/0x30 [ 29.373204] ? tcp_fastopen_reset_cipher+0x2a6/0x570 [ 29.378293] ? tcp_fastopen_ctx_destroy+0x260/0x260 [ 29.383299] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.388832] ? _copy_from_user+0xdf/0x150 [ 29.392970] ? do_tcp_setsockopt.isra.41+0x1fe/0x2620 [ 29.398154] ? release_sock+0x1ec/0x2c0 [ 29.402118] ? lock_downgrade+0x8f0/0x8f0 [ 29.406263] ? kasan_check_read+0x11/0x20 [ 29.410398] ? do_raw_spin_unlock+0xa7/0x2f0 [ 29.414787] ? release_sock+0x1ec/0x2c0 [ 29.418761] ? trace_hardirqs_on+0xd/0x10 [ 29.422906] ? __local_bh_enable_ip+0x161/0x230 [ 29.427567] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.432041] ? release_sock+0x1ec/0x2c0 [ 29.435993] ? kasan_check_write+0x14/0x20 [ 29.440306] ? __release_sock+0x3a0/0x3a0 [ 29.444430] ? __local_bh_enable_ip+0x161/0x230 [ 29.449091] ? smc_setsockopt+0x388/0x6e0 [ 29.453237] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.458757] ? __sys_setsockopt+0x257/0x3b0 [ 29.463058] do_group_exit+0x177/0x440 [ 29.466926] ? mm_fault_error+0x380/0x380 [ 29.471054] ? __ia32_sys_exit+0x50/0x50 [ 29.475100] __x64_sys_exit_group+0x3e/0x50 [ 29.479416] do_syscall_64+0x1b9/0x820 [ 29.483292] ? syscall_return_slowpath+0x5e0/0x5e0 [ 29.488208] ? syscall_return_slowpath+0x31d/0x5e0 [ 29.493133] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 29.498135] ? prepare_exit_to_usermode+0x291/0x3b0 [ 29.503147] ? perf_trace_sys_enter+0xb10/0xb10 [ 29.507812] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.512648] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.517836] RIP: 0033:0x43ec88 [ 29.521024] Code: Bad RIP value. [ 29.524400] RSP: 002b:00007ffdb1050388 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.532116] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ec88 [ 29.539393] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.546671] RBP: 00000000004be548 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.553931] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 29.561195] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 29.569061] Dumping ftrace buffer: [ 29.572588] (ftrace buffer empty) [ 29.576292] Kernel Offset: disabled [ 29.579927] Rebooting in 86400 seconds..