[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.372711] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.384494] random: sshd: uninitialized urandom read (32 bytes read) [ 25.956806] random: sshd: uninitialized urandom read (32 bytes read) [ 26.799275] random: sshd: uninitialized urandom read (32 bytes read) [ 26.954276] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 32.385590] random: sshd: uninitialized urandom read (32 bytes read) [ 32.476849] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 32.484843] PGD 1b1ed3067 P4D 1b1ed3067 PUD 1d9199067 PMD 0 [ 32.490660] Oops: 0010 [#1] SMP KASAN [ 32.494456] CPU: 1 PID: 4533 Comm: syz-executor603 Not tainted 4.17.0+ #115 [ 32.501542] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.510875] RIP: 0010: (null) [ 32.514738] Code: Bad RIP value. [ 32.518094] RSP: 0018:ffff8801d973f540 EFLAGS: 00010246 [ 32.523438] RAX: 0000000000000000 RBX: ffff8801ac5ed800 RCX: 1ffffffff10ea805 [ 32.530695] RDX: ffff8801d973fa60 RSI: ffff8801a7ed9940 RDI: ffff8801ac50d780 [ 32.537960] RBP: ffff8801d973f6b0 R08: 0000000000000001 R09: 0000000000000000 [ 32.545217] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1003b2e7ead [ 32.552491] R13: ffff8801d973fa60 R14: ffff8801ac5ed812 R15: ffff8801ac5edc58 [ 32.559764] FS: 0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:0000000009f37840 [ 32.567980] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.573852] CR2: ffffffffffffffd6 CR3: 00000001d9202000 CR4: 00000000001406e0 [ 32.581206] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.588461] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.595711] Call Trace: [ 32.598294] ? smc_poll+0x211/0xdd0 [ 32.601905] ? lru_cache_add+0x22c/0x450 [ 32.605949] ? __smc_connect+0xa90/0xa90 [ 32.609989] ? kvm_clock_read+0x25/0x30 [ 32.614272] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.619788] ? ktime_get_ts64+0x39d/0x510 [ 32.623915] ? do_gettimeofday+0x170/0x170 [ 32.628138] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.633658] ? __fget_light+0x2ef/0x430 [ 32.637613] sock_poll+0x1d1/0x710 [ 32.641138] ? __smc_connect+0xa90/0xa90 [ 32.645185] ? sock_get_poll_head+0x460/0x460 [ 32.649660] ? sock_get_poll_head+0x460/0x460 [ 32.654135] vfs_poll+0x77/0x2a0 [ 32.657481] do_sys_poll+0x6fd/0x1100 [ 32.661260] ? _raw_spin_unlock+0x22/0x30 [ 32.665390] ? compat_core_sys_select+0xae0/0xae0 [ 32.670213] ? find_held_lock+0x36/0x1c0 [ 32.674257] ? debug_mutex_init+0x1c/0x60 [ 32.678387] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.683389] ? graph_lock+0x170/0x170 [ 32.687174] ? graph_lock+0x170/0x170 [ 32.690953] ? debug_mutex_init+0x2d/0x60 [ 32.695081] ? pud_val+0x80/0xf0 [ 32.698426] ? pmd_val+0xf0/0xf0 [ 32.701773] ? find_held_lock+0x36/0x1c0 [ 32.705823] ? poll_initwait+0x180/0x180 [ 32.709875] ? pvclock_read_flags+0x160/0x160 [ 32.714350] ? ktime_get_ts64+0x405/0x510 [ 32.718483] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 32.723486] ? timespec64_add_safe+0x1f4/0x2d0 [ 32.728057] ? nsec_to_clock_t+0x30/0x30 [ 32.732102] ? do_gettimeofday+0x170/0x170 [ 32.736322] ? handle_mm_fault+0x55a/0xc70 [ 32.740543] ? poll_select_set_timeout+0x14f/0x220 [ 32.745467] ? do_restart_poll+0x2d0/0x2d0 [ 32.749682] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.755201] ? __do_page_fault+0x441/0xe40 [ 32.759506] __ia32_sys_poll+0x189/0x510 [ 32.763548] ? __x64_sys_poll+0x510/0x510 [ 32.767685] ? do_fast_syscall_32+0x148/0xf9b [ 32.772176] do_fast_syscall_32+0x345/0xf9b [ 32.776493] ? do_int80_syscall_32+0x880/0x880 [ 32.781066] ? do_syscall_64+0x48f/0x800 [ 32.785116] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.790033] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.794943] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.800458] ? retint_user+0x18/0x18 [ 32.804154] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.808978] entry_SYSENTER_compat+0x70/0x7f [ 32.813381] RIP: 0023:0xf7f65cb9 [ 32.816721] Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 32.835841] RSP: 002b:00000000fffe196c EFLAGS: 00000213 ORIG_RAX: 00000000000000a8 [ 32.843533] RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 0000000000000001 [ 32.850798] RDX: 0000000000000003 RSI: 0000000000000032 RDI: 00000000ffffffff [ 32.858057] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 32.865312] R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000000 [ 32.872566] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 32.879911] Modules linked in: [ 32.883084] Dumping ftrace buffer: [ 32.886772] (ftrace buffer empty) [ 32.890459] CR2: 0000000000000000 [ 32.894151] ---[ end trace 5cf48e2f364e454e ]--- [ 32.898925] RIP: 0010: (null) [ 32.902850] Code: Bad RIP value. [ 32.906239] RSP: 0018:ffff8801d973f540 EFLAGS: 00010246 [ 32.911632] RAX: 0000000000000000 RBX: ffff8801ac5ed800 RCX: 1ffffffff10ea805 [ 32.918925] RDX: ffff8801d973fa60 RSI: ffff8801a7ed9940 RDI: ffff8801ac50d780 [ 32.926207] RBP: ffff8801d973f6b0 R08: 0000000000000001 R09: 0000000000000000 [ 32.933485] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1003b2e7ead [ 32.940775] R13: ffff8801d973fa60 R14: ffff8801ac5ed812 R15: ffff8801ac5edc58 [ 32.948064] FS: 0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:0000000009f37840 [ 32.956292] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.962174] CR2: ffffffffffffffd6 CR3: 00000001d9202000 CR4: 00000000001406e0 [ 32.969467] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.976740] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.984035] Kernel panic - not syncing: Fatal exception [ 32.990002] Dumping ftrace buffer: [ 32.993536] (ftrace buffer empty) [ 32.997231] Kernel Offset: disabled [ 33.000846] Rebooting in 86400 seconds..