[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.695406] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.260370] random: sshd: uninitialized urandom read (32 bytes read) [ 25.745681] random: sshd: uninitialized urandom read (32 bytes read) [ 26.556274] random: sshd: uninitialized urandom read (32 bytes read) [ 26.720483] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. [ 32.190709] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.283116] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 32.291120] PGD 1ab68b067 P4D 1ab68b067 PUD 1ab689067 PMD 0 [ 32.296924] Oops: 0010 [#1] SMP KASAN [ 32.300715] CPU: 0 PID: 4550 Comm: syz-executor619 Not tainted 4.17.0+ #96 [ 32.307712] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.317059] RIP: 0010: (null) [ 32.320921] Code: Bad RIP value. [ 32.324398] RSP: 0018:ffff8801ababf3a0 EFLAGS: 00010246 [ 32.329753] RAX: 0000000000000000 RBX: ffff8801acfb6800 RCX: 1ffffffff10ea9fd [ 32.337106] RDX: ffff8801ababfc00 RSI: ffff8801a76aa500 RDI: ffff8801ab541a00 [ 32.344354] RBP: ffff8801ababf510 R08: ffff8801ab58ef78 R09: 0000000000000006 [ 32.351705] R10: ffff8801ab58e740 R11: 0000000000000000 R12: 1ffff10035757e79 [ 32.359577] R13: ffff8801ababfc00 R14: ffff8801acfb6812 R15: ffff8801acfb6c58 [ 32.366835] FS: 00000000017b8880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 32.375129] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.381018] CR2: ffffffffffffffd6 CR3: 00000001ab6d3000 CR4: 00000000001406f0 [ 32.388290] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.395666] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.402923] Call Trace: [ 32.405666] ? smc_poll+0x211/0xdd0 [ 32.409290] ? __smc_connect+0xa90/0xa90 [ 32.413349] ? save_stack+0x43/0xd0 [ 32.417233] ? kasan_kmalloc+0xc4/0xe0 [ 32.421127] ? kasan_slab_alloc+0x12/0x20 [ 32.425280] ? kmem_cache_alloc+0x12e/0x760 [ 32.429600] ? ep_insert+0x270/0x1c00 [ 32.433382] ? __x64_sys_epoll_ctl+0xef1/0x10f0 [ 32.438045] ? do_syscall_64+0x1b1/0x800 [ 32.442092] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.447546] ? graph_lock+0x170/0x170 [ 32.451349] ? debug_check_no_locks_freed+0x310/0x310 [ 32.456532] ? find_held_lock+0x36/0x1c0 [ 32.460584] ? print_usage_bug+0xc0/0xc0 [ 32.464631] sock_poll+0x1d1/0x710 [ 32.468166] ? __smc_connect+0xa90/0xa90 [ 32.472208] ? sock_get_poll_head+0x460/0x460 [ 32.476685] ? sock_get_poll_head+0x460/0x460 [ 32.481162] vfs_poll+0x77/0x2a0 [ 32.484513] ep_item_poll.isra.15+0x2c1/0x390 [ 32.489103] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.494115] ? ep_eventpoll_poll+0x1f0/0x1f0 [ 32.498593] ? ep_insert+0x270/0x1c00 [ 32.502394] ep_insert+0x6b8/0x1c00 [ 32.506014] ? pudp_huge_clear_flush+0x230/0x230 [ 32.510767] ? ep_send_events_proc+0xee0/0xee0 [ 32.515330] ? lock_release+0xa10/0xa10 [ 32.519287] ? check_same_owner+0x320/0x320 [ 32.523591] ? rcu_note_context_switch+0x710/0x710 [ 32.528520] ? __might_sleep+0x95/0x190 [ 32.532477] ? kasan_check_write+0x14/0x20 [ 32.536815] ? __mutex_lock+0x7d9/0x17f0 [ 32.540882] ? __x64_sys_epoll_ctl+0x518/0x10f0 [ 32.545557] ? find_held_lock+0x36/0x1c0 [ 32.549701] ? mutex_trylock+0x2a0/0x2a0 [ 32.553832] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.558979] ? graph_lock+0x170/0x170 [ 32.562764] ? lockdep_init_map+0x9/0x10 [ 32.566825] ? debug_mutex_init+0x2d/0x60 [ 32.570954] ? pud_val+0x80/0xf0 [ 32.574301] ? pmd_val+0xf0/0xf0 [ 32.577652] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.583169] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.588699] ? __handle_mm_fault+0x93a/0x4390 [ 32.593275] ? find_held_lock+0x36/0x1c0 [ 32.597332] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.602862] ? __fget_light+0x2ef/0x430 [ 32.606913] ? fget_raw+0x20/0x20 [ 32.610346] ? find_held_lock+0x36/0x1c0 [ 32.614412] ? __might_sleep+0x95/0x190 [ 32.618373] ? clear_tfile_check_list+0x380/0x380 [ 32.623213] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 32.628389] __x64_sys_epoll_ctl+0xef1/0x10f0 [ 32.632891] ? __ia32_sys_epoll_create+0x70/0x70 [ 32.637640] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.643186] ? __do_page_fault+0x441/0xe40 [ 32.647415] ? mm_fault_error+0x380/0x380 [ 32.651566] ? __ia32_sys_fallocate+0xf0/0xf0 [ 32.656051] ? do_syscall_64+0x92/0x800 [ 32.660016] do_syscall_64+0x1b1/0x800 [ 32.663980] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.668898] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.673813] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.679331] ? retint_user+0x18/0x18 [ 32.683037] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.687891] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.693063] RIP: 0033:0x43fce9 [ 32.696245] 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 [ 32.715403] RSP: 002b:00007ffe8ddd2f58 EFLAGS: 00000217 ORIG_RAX: 00000000000000e9 [ 32.723099] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fce9 [ 32.730364] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 [ 32.737616] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 32.744892] R10: 0000000020c7f000 R11: 0000000000000217 R12: 0000000000401610 [ 32.752169] R13: 00000000004016a0 R14: 0000000000000000 R15: 0000000000000000 [ 32.759435] Modules linked in: [ 32.762633] Dumping ftrace buffer: [ 32.766151] (ftrace buffer empty) [ 32.769842] CR2: 0000000000000000 [ 32.773336] ---[ end trace 9a2a364aa2f3d1e8 ]--- [ 32.778108] RIP: 0010: (null) [ 32.782019] Code: Bad RIP value. [ 32.785499] RSP: 0018:ffff8801ababf3a0 EFLAGS: 00010246 [ 32.790978] RAX: 0000000000000000 RBX: ffff8801acfb6800 RCX: 1ffffffff10ea9fd [ 32.798271] RDX: ffff8801ababfc00 RSI: ffff8801a76aa500 RDI: ffff8801ab541a00 [ 32.806121] RBP: ffff8801ababf510 R08: ffff8801ab58ef78 R09: 0000000000000006 [ 32.813423] R10: ffff8801ab58e740 R11: 0000000000000000 R12: 1ffff10035757e79 [ 32.820700] R13: ffff8801ababfc00 R14: ffff8801acfb6812 R15: ffff8801acfb6c58 [ 32.827979] FS: 00000000017b8880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 32.836214] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.842113] CR2: ffffffffffffffd6 CR3: 00000001ab6d3000 CR4: 00000000001406f0 [ 32.850611] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.857888] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.865303] Kernel panic - not syncing: Fatal exception [ 32.871430] Dumping ftrace buffer: [ 32.874973] (ftrace buffer empty) [ 32.878666] Kernel Offset: disabled [ 32.882278] Rebooting in 86400 seconds..