[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.896943] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.120460] random: sshd: uninitialized urandom read (32 bytes read) [ 25.617370] random: sshd: uninitialized urandom read (32 bytes read) [ 26.439800] random: sshd: uninitialized urandom read (32 bytes read) [ 26.607450] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. [ 32.072167] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.166302] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 32.174346] PGD 1ac05c067 P4D 1ac05c067 PUD 1ac155067 PMD 0 [ 32.180136] Oops: 0010 [#1] SMP KASAN [ 32.183936] CPU: 1 PID: 4574 Comm: syz-executor067 Not tainted 4.17.0+ #101 [ 32.191023] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.200380] RIP: 0010: (null) [ 32.204242] Code: Bad RIP value. [ 32.207598] RSP: 0018:ffff8801ae2ef4c0 EFLAGS: 00010246 [ 32.212944] RAX: 0000000000000000 RBX: ffff8801d8e74800 RCX: 1ffffffff10eac7d [ 32.220199] RDX: ffff8801ae2ef9e0 RSI: ffff8801a8700000 RDI: ffff8801ac49f780 [ 32.227463] RBP: ffff8801ae2ef630 R08: 0000000000000001 R09: 0000000000000000 [ 32.234719] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10035c5de9d [ 32.241968] R13: ffff8801ae2ef9e0 R14: ffff8801d8e74812 R15: ffff8801d8e74c58 [ 32.249224] FS: 00000000017a9880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 32.257444] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.263329] CR2: ffffffffffffffd6 CR3: 00000001d8c00000 CR4: 00000000001406e0 [ 32.270586] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.277845] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.285099] Call Trace: [ 32.287684] ? smc_poll+0x211/0xdd0 [ 32.291294] ? __pagevec_lru_add+0x30/0x30 [ 32.295511] ? __smc_connect+0xa90/0xa90 [ 32.299557] ? save_stack+0xa9/0xd0 [ 32.303179] ? find_held_lock+0x36/0x1c0 [ 32.307248] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.312794] ? __fget_light+0x2ef/0x430 [ 32.316785] sock_poll+0x1d1/0x710 [ 32.320329] ? __smc_connect+0xa90/0xa90 [ 32.324376] ? sock_get_poll_head+0x460/0x460 [ 32.328866] ? __might_sleep+0x95/0x190 [ 32.332835] ? sock_get_poll_head+0x460/0x460 [ 32.337318] vfs_poll+0x77/0x2a0 [ 32.340679] do_sys_poll+0x6fd/0x1100 [ 32.344487] ? lock_downgrade+0x8e0/0x8e0 [ 32.348627] ? compat_core_sys_select+0xaf0/0xaf0 [ 32.353462] ? do_huge_pmd_anonymous_page+0x455/0x1b50 [ 32.358734] ? __x64_sys_socket+0x73/0xb0 [ 32.362879] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.367884] ? graph_lock+0x170/0x170 [ 32.371680] ? graph_lock+0x170/0x170 [ 32.375476] ? graph_lock+0x170/0x170 [ 32.379261] ? pud_val+0x80/0xf0 [ 32.382627] ? pmd_val+0xf0/0xf0 [ 32.385977] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.391507] ? find_held_lock+0x36/0x1c0 [ 32.395564] ? lock_downgrade+0x8e0/0x8e0 [ 32.399708] ? __set_task_blocked+0x20f/0x310 [ 32.404199] ? kasan_check_read+0x11/0x20 [ 32.408344] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.412749] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.417333] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.421816] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.426816] ? trace_hardirqs_on+0xd/0x10 [ 32.430955] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.435435] ? __set_current_blocked+0xe4/0x120 [ 32.440083] ? sigprocmask+0xf4/0x300 [ 32.443865] ? sigsuspend+0x270/0x270 [ 32.447647] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.453167] ? _copy_from_user+0xdf/0x150 [ 32.457296] __x64_sys_ppoll+0x2fa/0x5f0 [ 32.461340] ? __ia32_sys_poll+0x510/0x510 [ 32.465562] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.471084] ? __do_page_fault+0x441/0xe40 [ 32.475301] ? mm_fault_error+0x380/0x380 [ 32.479439] ? __ia32_sys_fallocate+0xf0/0xf0 [ 32.483921] ? do_syscall_64+0x92/0x800 [ 32.487903] do_syscall_64+0x1b1/0x800 [ 32.491781] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.496616] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.501529] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.506445] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.511971] ? retint_user+0x18/0x18 [ 32.515665] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.520497] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.525665] RIP: 0033:0x43fcf9 [ 32.528841] 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 [ 32.547961] RSP: 002b:00007fff562f6a88 EFLAGS: 00000213 ORIG_RAX: 000000000000010f [ 32.555658] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcf9 [ 32.562932] RDX: 0000000020000140 RSI: 0000000000000001 RDI: 00000000200000c0 [ 32.570443] RBP: 00000000006ca018 R08: 0000000000000008 R09: 00000000004002c8 [ 32.577965] R10: 0000000020000180 R11: 0000000000000213 R12: 0000000000401620 [ 32.585225] R13: 00000000004016b0 R14: 0000000000000000 R15: 0000000000000000 [ 32.592480] Modules linked in: [ 32.595652] Dumping ftrace buffer: [ 32.599168] (ftrace buffer empty) [ 32.602855] CR2: 0000000000000000 [ 32.606362] ---[ end trace 5fa74ff5eccebb45 ]--- [ 32.611137] RIP: 0010: (null) [ 32.615035] Code: Bad RIP value. [ 32.618415] RSP: 0018:ffff8801ae2ef4c0 EFLAGS: 00010246 [ 32.623787] RAX: 0000000000000000 RBX: ffff8801d8e74800 RCX: 1ffffffff10eac7d [ 32.631067] RDX: ffff8801ae2ef9e0 RSI: ffff8801a8700000 RDI: ffff8801ac49f780 [ 32.638366] RBP: ffff8801ae2ef630 R08: 0000000000000001 R09: 0000000000000000 [ 32.645664] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10035c5de9d [ 32.652980] R13: ffff8801ae2ef9e0 R14: ffff8801d8e74812 R15: ffff8801d8e74c58 [ 32.660276] FS: 00000000017a9880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 32.668530] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.674430] CR2: ffffffffffffffd6 CR3: 00000001d8c00000 CR4: 00000000001406e0 [ 32.681732] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.689029] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.696309] Kernel panic - not syncing: Fatal exception [ 32.702136] Dumping ftrace buffer: [ 32.705674] (ftrace buffer empty) [ 32.709364] Kernel Offset: disabled [ 32.712971] Rebooting in 86400 seconds..