[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.188389] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.498165] random: sshd: uninitialized urandom read (32 bytes read) [ 25.863953] random: sshd: uninitialized urandom read (32 bytes read) [ 26.677528] random: sshd: uninitialized urandom read (32 bytes read) [ 26.856197] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. [ 32.368458] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.469798] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 32.478490] PGD 1d96f0067 P4D 1d96f0067 PUD 1d9215067 PMD 0 [ 32.484284] Oops: 0010 [#1] SMP KASAN [ 32.488068] CPU: 1 PID: 4579 Comm: syz-executor111 Not tainted 4.17.0+ #96 [ 32.495085] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.504475] RIP: 0010: (null) [ 32.508343] Code: Bad RIP value. [ 32.511704] RSP: 0018:ffff8801cf3e7590 EFLAGS: 00010246 [ 32.517047] RAX: 0000000000000000 RBX: ffff8801ac9c8800 RCX: 1ffffffff10ea9fd [ 32.524307] RDX: ffff8801cf3e7ab0 RSI: ffff8801a7ec2040 RDI: ffff8801ac759a40 [ 32.531565] RBP: ffff8801cf3e7700 R08: 0000000000000001 R09: 0000000000000000 [ 32.538817] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10039e7ceb7 [ 32.546091] R13: ffff8801cf3e7ab0 R14: ffff8801ac9c8812 R15: ffff8801ac9c8c58 [ 32.553386] FS: 0000000001576880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 32.561593] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.567465] CR2: ffffffffffffffd6 CR3: 00000001ac1a5000 CR4: 00000000001406e0 [ 32.574734] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.582097] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.589351] Call Trace: [ 32.591923] ? smc_poll+0x211/0xdd0 [ 32.595536] ? __mem_cgroup_threshold+0x720/0x720 [ 32.600363] ? __smc_connect+0xa90/0xa90 [ 32.604414] ? kvm_clock_read+0x25/0x30 [ 32.608381] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.613906] ? ktime_get_ts64+0x39d/0x510 [ 32.618088] ? do_gettimeofday+0x170/0x170 [ 32.622322] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.627847] ? __fget_light+0x2ef/0x430 [ 32.631821] sock_poll+0x1d1/0x710 [ 32.635365] ? __smc_connect+0xa90/0xa90 [ 32.639425] ? sock_get_poll_head+0x460/0x460 [ 32.643905] ? sock_get_poll_head+0x460/0x460 [ 32.648400] vfs_poll+0x77/0x2a0 [ 32.651761] do_sys_poll+0x6fd/0x1100 [ 32.655567] ? compat_core_sys_select+0xae0/0xae0 [ 32.660398] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.665416] ? graph_lock+0x170/0x170 [ 32.669201] ? graph_lock+0x170/0x170 [ 32.672990] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.678523] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.684057] ? __handle_mm_fault+0x93a/0x4390 [ 32.688550] ? find_held_lock+0x36/0x1c0 [ 32.692595] ? poll_initwait+0x180/0x180 [ 32.696654] ? pvclock_read_flags+0x160/0x160 [ 32.701135] ? ktime_get_ts64+0x405/0x510 [ 32.705268] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 32.710279] ? timespec64_add_safe+0x1f4/0x2d0 [ 32.714869] ? nsec_to_clock_t+0x30/0x30 [ 32.718923] ? do_gettimeofday+0x170/0x170 [ 32.723148] ? poll_select_set_timeout+0x14f/0x220 [ 32.728070] ? do_restart_poll+0x2d0/0x2d0 [ 32.732295] __x64_sys_poll+0x189/0x510 [ 32.736257] ? __ia32_sys_pselect6+0x270/0x270 [ 32.740828] ? do_syscall_64+0x92/0x800 [ 32.744785] do_syscall_64+0x1b1/0x800 [ 32.748659] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.753658] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.758588] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.764131] ? retint_user+0x18/0x18 [ 32.767843] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.772678] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.777865] RIP: 0033:0x43fcc9 [ 32.781038] 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 [ 32.800163] RSP: 002b:00007fffb366d318 EFLAGS: 00000213 ORIG_RAX: 0000000000000007 [ 32.807855] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcc9 [ 32.815102] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000020000040 [ 32.822350] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 32.829599] R10: 00000000004002c8 R11: 0000000000000213 R12: 00000000004015f0 [ 32.836847] R13: 0000000000401680 R14: 0000000000000000 R15: 0000000000000000 [ 32.844104] Modules linked in: [ 32.847277] Dumping ftrace buffer: [ 32.850792] (ftrace buffer empty) [ 32.854485] CR2: 0000000000000000 [ 32.858006] ---[ end trace 68ca0298a2502c68 ]--- [ 32.862797] RIP: 0010: (null) [ 32.866709] Code: Bad RIP value. [ 32.870108] RSP: 0018:ffff8801cf3e7590 EFLAGS: 00010246 [ 32.875479] RAX: 0000000000000000 RBX: ffff8801ac9c8800 RCX: 1ffffffff10ea9fd [ 32.882762] RDX: ffff8801cf3e7ab0 RSI: ffff8801a7ec2040 RDI: ffff8801ac759a40 [ 32.890042] RBP: ffff8801cf3e7700 R08: 0000000000000001 R09: 0000000000000000 [ 32.897323] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10039e7ceb7 [ 32.904633] R13: ffff8801cf3e7ab0 R14: ffff8801ac9c8812 R15: ffff8801ac9c8c58 [ 32.911930] FS: 0000000001576880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 32.920177] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.926071] CR2: ffffffffffffffd6 CR3: 00000001ac1a5000 CR4: 00000000001406e0 [ 32.933351] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.940647] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.947934] Kernel panic - not syncing: Fatal exception [ 32.953866] Dumping ftrace buffer: [ 32.957396] (ftrace buffer empty) [ 32.961096] Kernel Offset: disabled [ 32.964716] Rebooting in 86400 seconds..