[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.781883] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.494011] random: sshd: uninitialized urandom read (32 bytes read) [ 20.916637] random: sshd: uninitialized urandom read (32 bytes read) [ 21.739628] random: sshd: uninitialized urandom read (32 bytes read) [ 21.923890] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. [ 27.437961] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.533243] WARNING: CPU: 1 PID: 4517 at include/net/sock.h:644 smc_unhash_sk+0x357/0x4b0 [ 27.541640] Kernel panic - not syncing: panic_on_warn set ... [ 27.541640] [ 27.548987] CPU: 1 PID: 4517 Comm: syz-executor241 Not tainted 4.18.0-rc2+ #123 [ 27.556412] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.565743] Call Trace: [ 27.568321] dump_stack+0x1c9/0x2b4 [ 27.571930] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.577108] panic+0x238/0x4e7 [ 27.580285] ? add_taint.cold.5+0x16/0x16 [ 27.584414] ? __warn.cold.8+0x148/0x1ba [ 27.588453] ? __warn.cold.8+0x117/0x1ba [ 27.592497] ? smc_unhash_sk+0x357/0x4b0 [ 27.596538] __warn.cold.8+0x163/0x1ba [ 27.600413] ? smc_unhash_sk+0x357/0x4b0 [ 27.604454] report_bug+0x252/0x2d0 [ 27.608065] do_error_trap+0x1fc/0x4d0 [ 27.611941] ? math_error+0x3e0/0x3e0 [ 27.615724] ? print_usage_bug+0xc0/0xc0 [ 27.619765] ? lock_acquire+0x1e4/0x540 [ 27.623719] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.628549] do_invalid_op+0x1b/0x20 [ 27.632243] invalid_op+0x14/0x20 [ 27.635690] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 27.640331] 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 e7 1b fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 23 bb 59 fa [ 27.659505] RSP: 0018:ffff8801c00cf480 EFLAGS: 00010293 [ 27.664858] RAX: ffff8801ae7821c0 RBX: ffff8801cef50800 RCX: ffffffff87602406 [ 27.672105] RDX: 0000000000000000 RSI: ffffffff876024c7 RDI: 0000000000000005 [ 27.679354] RBP: ffff8801c00cf568 R08: ffff8801ae7821c0 R09: ffffed0039dea110 [ 27.686605] R10: ffffed0039dea110 R11: ffff8801cef50883 R12: 1ffff10038019e94 [ 27.693859] R13: ffff8801c00cf540 R14: ffffffff89934e60 R15: ffff8801cef50880 [ 27.701117] ? smc_unhash_sk+0x296/0x4b0 [ 27.705159] ? smc_unhash_sk+0x357/0x4b0 [ 27.709206] ? smc_rx_data_available+0x120/0x120 [ 27.713942] ? release_sock+0x1ec/0x2c0 [ 27.717898] ? __local_bh_enable_ip+0x161/0x230 [ 27.722554] ? __release_sock+0x3a0/0x3a0 [ 27.726690] ? smc_release+0x269/0x610 [ 27.730557] ? trace_hardirqs_on+0xd/0x10 [ 27.734682] ? __local_bh_enable_ip+0x161/0x230 [ 27.739352] smc_release+0x36e/0x610 [ 27.743053] __sock_release+0xd7/0x260 [ 27.746924] ? __sock_release+0x260/0x260 [ 27.751053] sock_close+0x19/0x20 [ 27.754490] __fput+0x355/0x8b0 [ 27.757751] ? fput+0x1a0/0x1a0 [ 27.761018] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.765505] ____fput+0x15/0x20 [ 27.768772] task_work_run+0x1ec/0x2a0 [ 27.772644] ? task_work_cancel+0x250/0x250 [ 27.776954] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 27.782475] ? switch_task_namespaces+0xa2/0xd0 [ 27.787125] do_exit+0x1b08/0x2750 [ 27.790646] ? mm_update_next_owner+0x9a0/0x9a0 [ 27.795300] ? find_held_lock+0x36/0x1c0 [ 27.799348] ? lock_downgrade+0x8f0/0x8f0 [ 27.803473] ? lock_downgrade+0x8f0/0x8f0 [ 27.807607] ? kasan_check_read+0x11/0x20 [ 27.811732] ? do_raw_spin_unlock+0xa7/0x2f0 [ 27.816135] ? __local_bh_enable_ip+0x161/0x230 [ 27.820872] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.825870] ? release_sock+0x1ec/0x2c0 [ 27.829827] ? trace_hardirqs_on+0xd/0x10 [ 27.833966] ? __local_bh_enable_ip+0x161/0x230 [ 27.838618] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.843006] ? release_sock+0x1ec/0x2c0 [ 27.846967] ? __release_sock+0x3a0/0x3a0 [ 27.851096] ? __local_bh_enable_ip+0x161/0x230 [ 27.855749] ? smc_sendmsg+0x2d5/0x370 [ 27.859613] ? smc_sendpage+0x1a0/0x1a0 [ 27.863571] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.869090] ? sock_sendmsg+0x5a/0x120 [ 27.872970] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.878495] ? __sys_sendto+0x475/0x670 [ 27.882451] ? __ia32_sys_getpeername+0xb0/0xb0 [ 27.887104] ? lock_downgrade+0x8f0/0x8f0 [ 27.891231] ? handle_mm_fault+0x8c4/0xc80 [ 27.895450] ? handle_mm_fault+0x55d/0xc80 [ 27.899671] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.905210] do_group_exit+0x177/0x440 [ 27.909083] ? mm_fault_error+0x380/0x380 [ 27.913210] ? __ia32_sys_exit+0x50/0x50 [ 27.917265] ? do_syscall_64+0x9a/0x820 [ 27.921219] __x64_sys_exit_group+0x3e/0x50 [ 27.925519] do_syscall_64+0x1b9/0x820 [ 27.929389] ? syscall_return_slowpath+0x5e0/0x5e0 [ 27.934310] ? syscall_return_slowpath+0x31d/0x5e0 [ 27.939237] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.944597] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.949427] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.954597] RIP: 0033:0x43e918 [ 27.957764] Code: Bad RIP value. [ 27.961124] RSP: 002b:00007ffede42a6b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 27.968811] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e918 [ 27.976059] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 27.983306] RBP: 00000000004be2c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 27.990563] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 27.997811] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.005703] Dumping ftrace buffer: [ 28.009384] (ftrace buffer empty) [ 28.013073] Kernel Offset: disabled [ 28.016681] Rebooting in 86400 seconds..