[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.063668] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.981601] random: sshd: uninitialized urandom read (32 bytes read) [ 25.631933] random: sshd: uninitialized urandom read (32 bytes read) [ 26.552394] random: sshd: uninitialized urandom read (32 bytes read) [ 26.711810] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.60' (ECDSA) to the list of known hosts. [ 32.200083] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.293733] WARNING: CPU: 0 PID: 4531 at include/net/sock.h:644 smc_unhash_sk+0x357/0x4b0 [ 32.302175] Kernel panic - not syncing: panic_on_warn set ... [ 32.302175] [ 32.309530] CPU: 0 PID: 4531 Comm: syz-executor281 Not tainted 4.18.0-rc5+ #149 [ 32.316964] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.326307] Call Trace: [ 32.328891] dump_stack+0x1c9/0x2b4 [ 32.332512] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.337699] panic+0x238/0x4e7 [ 32.340882] ? add_taint.cold.5+0x16/0x16 [ 32.345023] ? __warn.cold.8+0x148/0x1ba [ 32.349072] ? __warn.cold.8+0x117/0x1ba [ 32.353127] ? smc_unhash_sk+0x357/0x4b0 [ 32.357180] __warn.cold.8+0x163/0x1ba [ 32.361058] ? smc_unhash_sk+0x357/0x4b0 [ 32.365111] report_bug+0x252/0x2d0 [ 32.368732] do_error_trap+0x1fc/0x4d0 [ 32.372610] ? math_error+0x3e0/0x3e0 [ 32.376417] ? print_usage_bug+0xc0/0xc0 [ 32.380470] ? lock_acquire+0x1e4/0x540 [ 32.384437] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.389270] do_invalid_op+0x1b/0x20 [ 32.392975] invalid_op+0x14/0x20 [ 32.396421] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 32.401071] 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 89 42 1a fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 73 21 58 fa [ 32.420271] RSP: 0018:ffff8801ac017480 EFLAGS: 00010293 [ 32.425624] RAX: ffff8801d8d78300 RBX: ffff8801ac1bd0c0 RCX: ffffffff8761c7f6 [ 32.432882] RDX: 0000000000000000 RSI: ffffffff8761c8b7 RDI: 0000000000000005 [ 32.440140] RBP: ffff8801ac017568 R08: ffff8801d8d78300 R09: ffffed0035837a28 [ 32.447405] R10: ffffed0035837a28 R11: ffff8801ac1bd143 R12: 1ffff10035802e94 [ 32.454677] R13: ffff8801ac017540 R14: ffffffff899373c0 R15: ffff8801ac1bd140 [ 32.461977] ? smc_unhash_sk+0x296/0x4b0 [ 32.466031] ? smc_unhash_sk+0x357/0x4b0 [ 32.470100] ? smc_rx_data_available+0x120/0x120 [ 32.474847] ? release_sock+0x1ec/0x2c0 [ 32.478811] ? __local_bh_enable_ip+0x161/0x230 [ 32.483470] ? __release_sock+0x3a0/0x3a0 [ 32.487611] ? smc_release+0x2c9/0x670 [ 32.491489] ? trace_hardirqs_on+0xd/0x10 [ 32.495628] ? __local_bh_enable_ip+0x161/0x230 [ 32.500289] smc_release+0x3cf/0x670 [ 32.503997] __sock_release+0xd7/0x260 [ 32.507872] ? __sock_release+0x260/0x260 [ 32.512024] sock_close+0x19/0x20 [ 32.515465] __fput+0x355/0x8b0 [ 32.518737] ? fput+0x1a0/0x1a0 [ 32.522006] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.526492] ____fput+0x15/0x20 [ 32.529762] task_work_run+0x1ec/0x2a0 [ 32.533641] ? task_work_cancel+0x250/0x250 [ 32.537960] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.543490] ? switch_task_namespaces+0xa2/0xd0 [ 32.548160] do_exit+0x1b08/0x2750 [ 32.551691] ? lock_downgrade+0x8d1/0x8f0 [ 32.555825] ? mm_update_next_owner+0x9a0/0x9a0 [ 32.560485] ? kasan_check_read+0x11/0x20 [ 32.564621] ? do_raw_spin_unlock+0xa7/0x2f0 [ 32.569017] ? __local_bh_enable_ip+0x161/0x230 [ 32.573679] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.578690] ? release_sock+0x1ec/0x2c0 [ 32.582659] ? trace_hardirqs_on+0xd/0x10 [ 32.586798] ? __local_bh_enable_ip+0x161/0x230 [ 32.591460] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.595860] ? kasan_check_read+0x11/0x20 [ 32.600001] ? rcu_is_watching+0x8c/0x150 [ 32.604156] ? rcu_pm_notify+0xc0/0xc0 [ 32.608038] ? ___sys_sendmsg+0x313/0x930 [ 32.612180] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.617191] ? kfree+0x1e9/0x260 [ 32.620547] ? ___sys_sendmsg+0x318/0x930 [ 32.624692] ? graph_lock+0x170/0x170 [ 32.628495] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.634025] ? __fget_light+0x2f7/0x440 [ 32.637992] ? fget_raw+0x20/0x20 [ 32.641439] ? lock_downgrade+0x8f0/0x8f0 [ 32.645576] ? handle_mm_fault+0x8c4/0xc80 [ 32.649807] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.655338] ? sockfd_lookup_light+0xc5/0x160 [ 32.659823] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.665354] ? __sys_sendmsg+0x1ba/0x290 [ 32.669410] ? __ia32_sys_shutdown+0x80/0x80 [ 32.673811] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.679344] ? __do_page_fault+0x449/0xe50 [ 32.683573] do_group_exit+0x177/0x440 [ 32.687452] ? __ia32_sys_exit+0x50/0x50 [ 32.691504] ? do_syscall_64+0x9a/0x820 [ 32.695463] __x64_sys_exit_group+0x3e/0x50 [ 32.699774] do_syscall_64+0x1b9/0x820 [ 32.703659] ? syscall_slow_exit_work+0x500/0x500 [ 32.708503] ? syscall_return_slowpath+0x5e0/0x5e0 [ 32.713424] ? syscall_return_slowpath+0x31d/0x5e0 [ 32.718374] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.723733] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.728567] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.733756] RIP: 0033:0x43ed38 [ 32.736935] Code: Bad RIP value. [ 32.740301] RSP: 002b:00007ffe343559a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.748001] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed38 [ 32.755261] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.762518] RBP: 00000000004be5e8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.769774] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 32.777030] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 32.784960] Dumping ftrace buffer: [ 32.788650] (ftrace buffer empty) [ 32.792345] Kernel Offset: disabled [ 32.795964] Rebooting in 86400 seconds..