[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.675822] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.131258] random: sshd: uninitialized urandom read (32 bytes read) [ 23.400253] random: sshd: uninitialized urandom read (32 bytes read) [ 24.199710] random: sshd: uninitialized urandom read (32 bytes read) [ 24.359263] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. [ 29.802957] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.906200] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 29.914305] PGD 1b40a4067 P4D 1b40a4067 PUD 1b6468067 PMD 0 [ 29.920095] Oops: 0010 [#1] SMP KASAN [ 29.923876] CPU: 0 PID: 4489 Comm: syz-executor226 Not tainted 4.17.0+ #92 [ 29.930861] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.940193] RIP: 0010: (null) [ 29.944053] Code: Bad RIP value. [ 29.947405] RSP: 0018:ffff8801b31b76d8 EFLAGS: 00010246 [ 29.952757] RAX: 0000000000000000 RBX: ffff8801ad25d940 RCX: ffffffff85e1d8e9 [ 29.960014] RDX: ffff8801b31b7ab0 RSI: ffff8801ad25d940 RDI: ffff8801ca9cb040 [ 29.967272] RBP: ffff8801b31b7700 R08: ffff8801b9244580 R09: ffffed00373ddd78 [ 29.974528] R10: ffffed00373ddd78 R11: ffff8801b9eeebc3 R12: ffff8801ad61ed00 [ 29.981774] R13: ffff8801ca9cb040 R14: ffff8801b31b7ab0 R15: 0000000000000018 [ 29.989028] FS: 0000000001596880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 29.997236] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.003096] CR2: ffffffffffffffd6 CR3: 00000001b42f9000 CR4: 00000000001406f0 [ 30.010346] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.017593] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.024847] Call Trace: [ 30.027416] ? tls_sw_poll+0xc1/0x140 [ 30.031196] sock_poll+0x1d1/0x710 [ 30.034714] ? tls_sw_splice_read+0x790/0x790 [ 30.039187] ? sock_get_poll_head+0x460/0x460 [ 30.043661] ? __might_sleep+0x95/0x190 [ 30.047616] ? sock_get_poll_head+0x460/0x460 [ 30.052090] vfs_poll+0x77/0x2a0 [ 30.055438] do_sys_poll+0x6fd/0x1100 [ 30.059233] ? compat_core_sys_select+0xae0/0xae0 [ 30.064644] ? flush_rcu_work+0x90/0x90 [ 30.068602] ? mark_held_locks+0xc9/0x160 [ 30.072729] ? graph_lock+0x170/0x170 [ 30.076507] ? graph_lock+0x170/0x170 [ 30.080285] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.085280] ? find_held_lock+0x36/0x1c0 [ 30.089324] ? kasan_check_read+0x11/0x20 [ 30.093449] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.097838] ? __local_bh_enable_ip+0x161/0x230 [ 30.102492] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.107491] ? release_sock+0x1e2/0x2b0 [ 30.111446] ? trace_hardirqs_on+0xd/0x10 [ 30.115586] ? __local_bh_enable_ip+0x161/0x230 [ 30.120241] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.124629] ? release_sock+0x1e2/0x2b0 [ 30.128582] ? __release_sock+0x3a0/0x3a0 [ 30.132709] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.138227] ? _copy_from_user+0xdf/0x150 [ 30.142368] ? tls_setsockopt+0xb2/0x720 [ 30.146411] ? sock_common_setsockopt+0x9a/0xe0 [ 30.151062] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.156577] ? poll_select_set_timeout+0x14f/0x220 [ 30.161496] ? do_restart_poll+0x2d0/0x2d0 [ 30.165721] ? kernel_accept+0x310/0x310 [ 30.169769] __x64_sys_poll+0x189/0x510 [ 30.173743] ? __ia32_sys_pselect6+0x270/0x270 [ 30.178313] ? do_syscall_64+0x92/0x800 [ 30.182282] do_syscall_64+0x1b1/0x800 [ 30.186159] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.191077] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.196003] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.201363] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.206194] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.211361] RIP: 0033:0x43ff09 [ 30.214524] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00 [ 30.233643] RSP: 002b:00007ffdd7faee48 EFLAGS: 00000217 ORIG_RAX: 0000000000000007 [ 30.241331] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043ff09 [ 30.248579] RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000020000000 [ 30.255824] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 30.263070] R10: 0000000000000028 R11: 0000000000000217 R12: 0000000000401830 [ 30.270329] R13: 00000000004018c0 R14: 0000000000000000 R15: 0000000000000000 [ 30.277577] Modules linked in: [ 30.280762] Dumping ftrace buffer: [ 30.284277] (ftrace buffer empty) [ 30.287965] CR2: 0000000000000000 [ 30.291496] ---[ end trace 75cef8562567ea85 ]--- [ 30.296269] RIP: 0010: (null) [ 30.300149] Code: Bad RIP value. [ 30.303523] RSP: 0018:ffff8801b31b76d8 EFLAGS: 00010246 [ 30.308894] RAX: 0000000000000000 RBX: ffff8801ad25d940 RCX: ffffffff85e1d8e9 [ 30.316184] RDX: ffff8801b31b7ab0 RSI: ffff8801ad25d940 RDI: ffff8801ca9cb040 [ 30.323463] RBP: ffff8801b31b7700 R08: ffff8801b9244580 R09: ffffed00373ddd78 [ 30.330733] R10: ffffed00373ddd78 R11: ffff8801b9eeebc3 R12: ffff8801ad61ed00 [ 30.338024] R13: ffff8801ca9cb040 R14: ffff8801b31b7ab0 R15: 0000000000000018 [ 30.345298] FS: 0000000001596880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 30.353523] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.359405] CR2: ffffffffffffffd6 CR3: 00000001b42f9000 CR4: 00000000001406f0 [ 30.366691] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.373975] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.381260] Kernel panic - not syncing: Fatal exception [ 30.387107] Dumping ftrace buffer: [ 30.390630] (ftrace buffer empty) [ 30.394328] Kernel Offset: disabled [ 30.397932] Rebooting in 86400 seconds..