[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.149354] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.977824] random: sshd: uninitialized urandom read (32 bytes read) [ 21.359583] random: sshd: uninitialized urandom read (32 bytes read) [ 22.077835] random: sshd: uninitialized urandom read (32 bytes read) [ 22.212566] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts. [ 27.694242] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.773007] WARNING: CPU: 0 PID: 4467 at include/net/sock.h:660 smc_unhash_sk+0x357/0x4b0 [ 27.781345] Kernel panic - not syncing: panic_on_warn set ... [ 27.781345] [ 27.788700] CPU: 0 PID: 4467 Comm: syz-executor279 Not tainted 4.18.0-rc3+ #122 [ 27.796121] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.805449] Call Trace: [ 27.808018] dump_stack+0x1c9/0x2b4 [ 27.812113] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.817284] panic+0x238/0x4e7 [ 27.820455] ? add_taint.cold.5+0x16/0x16 [ 27.824584] ? __warn.cold.8+0x148/0x1ba [ 27.828622] ? __warn.cold.8+0x117/0x1ba [ 27.832663] ? smc_unhash_sk+0x357/0x4b0 [ 27.836702] __warn.cold.8+0x163/0x1ba [ 27.840565] ? smc_unhash_sk+0x357/0x4b0 [ 27.844610] report_bug+0x252/0x2d0 [ 27.848215] do_error_trap+0x1fc/0x4d0 [ 27.852081] ? math_error+0x3e0/0x3e0 [ 27.855859] ? kasan_check_write+0x14/0x20 [ 27.860072] ? do_raw_spin_lock+0xc1/0x200 [ 27.864293] ? lock_acquire+0x1e4/0x540 [ 27.868246] ? smc_unhash_sk+0xd7/0x4b0 [ 27.872197] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.877189] do_invalid_op+0x1b/0x20 [ 27.880883] invalid_op+0x14/0x20 [ 27.884314] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 27.888952] 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 [ 27.908075] RSP: 0018:ffff8801ad2a7480 EFLAGS: 00010293 [ 27.913414] RAX: ffff8801ad0a8280 RBX: ffff8801ad289140 RCX: ffffffff8763b666 [ 27.920660] RDX: 0000000000000000 RSI: ffffffff8763b727 RDI: 0000000000000005 [ 27.927909] RBP: ffff8801ad2a7568 R08: ffff8801ad0a8280 R09: ffffed0035a51238 [ 27.935155] R10: ffffed0035a51238 R11: ffff8801ad2891c3 R12: 1ffff10035a54e94 [ 27.942399] R13: ffff8801ad2a7540 R14: ffffffff899381a0 R15: ffff8801ad2891c0 [ 27.949773] ? smc_unhash_sk+0x296/0x4b0 [ 27.953810] ? smc_unhash_sk+0x357/0x4b0 [ 27.957855] ? smc_rx_data_available+0x120/0x120 [ 27.962587] ? release_sock+0x1ec/0x2c0 [ 27.966538] ? do_raw_write_trylock+0x1c0/0x1c0 [ 27.971182] ? __release_sock+0x3a0/0x3a0 [ 27.975305] ? smc_release+0x2cb/0x680 [ 27.979167] ? trace_hardirqs_on+0xd/0x10 [ 27.983289] ? __local_bh_enable_ip+0x161/0x230 [ 27.987937] smc_release+0x3d1/0x680 [ 27.991628] __sock_release+0xd7/0x260 [ 27.995491] ? __sock_release+0x260/0x260 [ 27.999620] sock_close+0x19/0x20 [ 28.003052] __fput+0x355/0x8b0 [ 28.006308] ? fput+0x1a0/0x1a0 [ 28.009589] ? kasan_check_write+0x14/0x20 [ 28.013799] ? do_raw_spin_lock+0xc1/0x200 [ 28.018016] ____fput+0x15/0x20 [ 28.021281] task_work_run+0x1ec/0x2a0 [ 28.025155] ? task_work_cancel+0x250/0x250 [ 28.029457] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.034974] ? switch_task_namespaces+0xa2/0xd0 [ 28.039622] do_exit+0x1b08/0x2750 [ 28.043141] ? lock_downgrade+0x8a1/0x8f0 [ 28.047264] ? mm_update_next_owner+0x9a0/0x9a0 [ 28.051910] ? kasan_check_read+0x11/0x20 [ 28.056037] ? do_raw_spin_unlock+0xa7/0x2f0 [ 28.060422] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 28.064992] ? release_sock+0x1ec/0x2c0 [ 28.068946] ? trace_hardirqs_on+0xd/0x10 [ 28.073070] ? __local_bh_enable_ip+0x161/0x230 [ 28.077718] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.082113] ? release_sock+0x1ec/0x2c0 [ 28.086064] ? __release_sock+0x3a0/0x3a0 [ 28.090195] ? __local_bh_enable_ip+0x161/0x230 [ 28.094847] ? smc_sendmsg+0x2d5/0x370 [ 28.098714] ? smc_sendpage+0x1a0/0x1a0 [ 28.102855] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.108375] ? kfree+0x15e/0x260 [ 28.111721] ? ___sys_sendmsg+0x318/0x930 [ 28.115867] ? lock_acquire+0x1e4/0x540 [ 28.119826] ? __fd_install+0x2b2/0x880 [ 28.123784] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.129297] ? __fget_light+0x2f7/0x440 [ 28.133253] ? lock_acquire+0x1e4/0x540 [ 28.137205] ? fget_raw+0x20/0x20 [ 28.140635] ? lock_release+0xa30/0xa30 [ 28.144586] ? lock_release+0xa30/0xa30 [ 28.148546] ? mem_cgroup_from_task+0xcb/0x1f0 [ 28.153124] ? __do_page_fault+0x664/0xe50 [ 28.157335] ? lock_downgrade+0x8f0/0x8f0 [ 28.161471] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.166989] ? sockfd_lookup_light+0xc5/0x160 [ 28.171472] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.176995] ? __sys_sendmsg+0x1ba/0x290 [ 28.181041] ? __ia32_sys_shutdown+0x80/0x80 [ 28.185431] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.190954] ? __do_page_fault+0x449/0xe50 [ 28.195175] do_group_exit+0x177/0x440 [ 28.199040] ? __ia32_sys_exit+0x50/0x50 [ 28.203082] __x64_sys_exit_group+0x3e/0x50 [ 28.207397] do_syscall_64+0x1b9/0x820 [ 28.211262] ? syscall_return_slowpath+0x5e0/0x5e0 [ 28.216169] ? syscall_return_slowpath+0x31d/0x5e0 [ 28.221106] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 28.226100] ? prepare_exit_to_usermode+0x291/0x3b0 [ 28.231093] ? perf_trace_sys_enter+0xb10/0xb10 [ 28.235740] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.240566] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.245730] RIP: 0033:0x43ed38 [ 28.248893] Code: Bad RIP value. [ 28.252245] RSP: 002b:00007ffd899b5228 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.259930] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed38 [ 28.267177] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.274424] RBP: 00000000004be5e8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.281674] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 28.289534] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 28.297216] Dumping ftrace buffer: [ 28.300731] (ftrace buffer empty) [ 28.304427] Kernel Offset: disabled [ 28.308041] Rebooting in 86400 seconds..