[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.740402] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.398008] random: sshd: uninitialized urandom read (32 bytes read) [ 25.874176] random: sshd: uninitialized urandom read (32 bytes read) [ 26.683494] random: sshd: uninitialized urandom read (32 bytes read) [ 26.845214] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.11' (ECDSA) to the list of known hosts. [ 32.346954] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.439890] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 32.448070] PGD 1abea9067 P4D 1abea9067 PUD 1aedd2067 PMD 0 [ 32.453874] Oops: 0010 [#1] SMP KASAN [ 32.457660] CPU: 0 PID: 4590 Comm: syz-executor633 Not tainted 4.17.0+ #121 [ 32.464952] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.474375] RIP: 0010: (null) [ 32.478237] Code: Bad RIP value. [ 32.481603] RSP: 0018:ffff8801abf17540 EFLAGS: 00010246 [ 32.487380] RAX: 0000000000000000 RBX: ffff8801abfca800 RCX: 1ffffffff10ea9fd [ 32.494629] RDX: ffff8801abf17a60 RSI: ffff8801a76ac9c0 RDI: ffff8801ab470540 [ 32.501975] RBP: ffff8801abf176b0 R08: 0000000000000001 R09: 0000000000000000 [ 32.509226] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff100357e2ead [ 32.516492] R13: ffff8801abf17a60 R14: ffff8801abfca812 R15: ffff8801abfcac58 [ 32.523747] FS: 0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000099ce840 [ 32.531950] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.537827] CR2: ffffffffffffffd6 CR3: 00000001d926a000 CR4: 00000000001406f0 [ 32.545173] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.552448] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.559699] Call Trace: [ 32.562274] ? smc_poll+0x211/0xdd0 [ 32.565902] ? lru_cache_add+0x22c/0x450 [ 32.569966] ? __smc_connect+0xa90/0xa90 [ 32.574015] ? kvm_clock_read+0x25/0x30 [ 32.577975] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.583494] ? ktime_get_ts64+0x39d/0x510 [ 32.587624] ? do_gettimeofday+0x170/0x170 [ 32.591843] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.597380] ? __fget_light+0x2ef/0x430 [ 32.601354] sock_poll+0x1d1/0x710 [ 32.604885] ? __smc_connect+0xa90/0xa90 [ 32.608934] ? sock_get_poll_head+0x460/0x460 [ 32.613504] ? sock_get_poll_head+0x460/0x460 [ 32.617988] vfs_poll+0x77/0x2a0 [ 32.621352] do_sys_poll+0x6fd/0x1100 [ 32.625136] ? _raw_spin_unlock+0x22/0x30 [ 32.629274] ? compat_core_sys_select+0xae0/0xae0 [ 32.634101] ? find_held_lock+0x36/0x1c0 [ 32.638145] ? debug_mutex_init+0x1c/0x60 [ 32.642283] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.647282] ? graph_lock+0x170/0x170 [ 32.651063] ? graph_lock+0x170/0x170 [ 32.654854] ? debug_mutex_init+0x2d/0x60 [ 32.658984] ? pud_val+0x80/0xf0 [ 32.662328] ? pmd_val+0xf0/0xf0 [ 32.665679] ? find_held_lock+0x36/0x1c0 [ 32.669725] ? poll_initwait+0x180/0x180 [ 32.673773] ? pvclock_read_flags+0x160/0x160 [ 32.678263] ? ktime_get_ts64+0x405/0x510 [ 32.682392] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 32.687392] ? timespec64_add_safe+0x1f4/0x2d0 [ 32.691955] ? nsec_to_clock_t+0x30/0x30 [ 32.695999] ? do_gettimeofday+0x170/0x170 [ 32.700226] ? handle_mm_fault+0x55a/0xc70 [ 32.704452] ? poll_select_set_timeout+0x14f/0x220 [ 32.709364] ? do_restart_poll+0x2d0/0x2d0 [ 32.713583] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.719195] ? __do_page_fault+0x441/0xe40 [ 32.723413] __ia32_sys_poll+0x189/0x510 [ 32.727463] ? __x64_sys_poll+0x510/0x510 [ 32.731592] ? do_fast_syscall_32+0x148/0xf9b [ 32.736070] do_fast_syscall_32+0x345/0xf9b [ 32.740371] ? do_int80_syscall_32+0x880/0x880 [ 32.744936] ? do_syscall_64+0x48f/0x800 [ 32.748991] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.753901] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.758848] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.764378] ? retint_user+0x18/0x18 [ 32.768075] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.772908] entry_SYSENTER_compat+0x70/0x7f [ 32.777303] RIP: 0023:0xf7f62cb9 [ 32.780653] 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 [ 32.799779] RSP: 002b:00000000ffb27a9c EFLAGS: 00000213 ORIG_RAX: 00000000000000a8 [ 32.807470] RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 0000000000000001 [ 32.814721] RDX: 0000000000000003 RSI: 0000000000000032 RDI: 00000000ffffffff [ 32.822328] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 32.829576] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000000000 [ 32.836828] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 32.844255] Modules linked in: [ 32.847445] Dumping ftrace buffer: [ 32.850963] (ftrace buffer empty) [ 32.854913] CR2: 0000000000000000 [ 32.858445] ---[ end trace e1f33fbf08364c0d ]--- [ 32.863214] RIP: 0010: (null) [ 32.867107] Code: Bad RIP value. [ 32.870497] RSP: 0018:ffff8801abf17540 EFLAGS: 00010246 [ 32.875881] RAX: 0000000000000000 RBX: ffff8801abfca800 RCX: 1ffffffff10ea9fd [ 32.883253] RDX: ffff8801abf17a60 RSI: ffff8801a76ac9c0 RDI: ffff8801ab470540 [ 32.890541] RBP: ffff8801abf176b0 R08: 0000000000000001 R09: 0000000000000000 [ 32.897830] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff100357e2ead [ 32.905222] R13: ffff8801abf17a60 R14: ffff8801abfca812 R15: ffff8801abfcac58 [ 32.912518] FS: 0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000099ce840 [ 32.920760] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.926664] CR2: ffffffffffffffd6 CR3: 00000001d926a000 CR4: 00000000001406f0 [ 32.933999] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.941292] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.948589] Kernel panic - not syncing: Fatal exception [ 32.953991] Dumping ftrace buffer: [ 32.957523] (ftrace buffer empty) [ 32.961219] Kernel Offset: disabled [ 32.964826] Rebooting in 86400 seconds..