[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.217775] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.761873] random: sshd: uninitialized urandom read (32 bytes read) [ 20.937520] random: sshd: uninitialized urandom read (32 bytes read) [ 21.736664] random: sshd: uninitialized urandom read (32 bytes read) [ 21.894265] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts. [ 27.362066] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.451558] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 27.459553] PGD 1ad64b067 P4D 1ad64b067 PUD 1af358067 PMD 0 [ 27.465339] Oops: 0010 [#1] SMP KASAN [ 27.469119] CPU: 0 PID: 4516 Comm: syz-executor468 Not tainted 4.17.0+ #92 [ 27.476111] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.485452] RIP: 0010: (null) [ 27.489311] Code: Bad RIP value. [ 27.492662] RSP: 0018:ffff8801ad05f3a0 EFLAGS: 00010246 [ 27.498003] RAX: 0000000000000000 RBX: ffff8801d0600800 RCX: 1ffffffff10ea8e5 [ 27.505256] RDX: ffff8801ad05fc00 RSI: ffff8801a9280000 RDI: ffff8801d957b000 [ 27.512503] RBP: ffff8801ad05f510 R08: ffff8801d958cdf8 R09: 0000000000000006 [ 27.519750] R10: ffff8801d958c5c0 R11: 0000000000000000 R12: 1ffff10035a0be79 [ 27.526996] R13: ffff8801ad05fc00 R14: ffff8801d0600812 R15: ffff8801d0600c58 [ 27.534249] FS: 0000000001dcd880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 27.542461] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.548319] CR2: ffffffffffffffd6 CR3: 00000001ad646000 CR4: 00000000001406f0 [ 27.555568] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.562816] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.570060] Call Trace: [ 27.572632] ? smc_poll+0x211/0xdd0 [ 27.576241] ? __smc_connect+0xa90/0xa90 [ 27.580285] ? save_stack+0x43/0xd0 [ 27.583890] ? kasan_kmalloc+0xc4/0xe0 [ 27.587765] ? kasan_slab_alloc+0x12/0x20 [ 27.591890] ? kmem_cache_alloc+0x12e/0x760 [ 27.596188] ? ep_insert+0x270/0x1c00 [ 27.599966] ? __x64_sys_epoll_ctl+0xef1/0x10f0 [ 27.604614] ? do_syscall_64+0x1b1/0x800 [ 27.608655] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.614010] ? graph_lock+0x170/0x170 [ 27.617797] ? debug_check_no_locks_freed+0x310/0x310 [ 27.622964] ? find_held_lock+0x36/0x1c0 [ 27.627021] ? print_usage_bug+0xc0/0xc0 [ 27.631071] sock_poll+0x1d1/0x710 [ 27.634609] ? __smc_connect+0xa90/0xa90 [ 27.638648] ? sock_get_poll_head+0x460/0x460 [ 27.643124] ? sock_get_poll_head+0x460/0x460 [ 27.647596] vfs_poll+0x77/0x2a0 [ 27.650942] ep_item_poll.isra.15+0x2c1/0x390 [ 27.655415] ? rcu_read_lock_sched_held+0x108/0x120 [ 27.660407] ? ep_eventpoll_poll+0x1f0/0x1f0 [ 27.664791] ? ep_insert+0x270/0x1c00 [ 27.668568] ep_insert+0x6b8/0x1c00 [ 27.672173] ? pudp_huge_clear_flush+0x230/0x230 [ 27.676906] ? ep_send_events_proc+0xee0/0xee0 [ 27.681466] ? lock_release+0xa10/0xa10 [ 27.685421] ? check_same_owner+0x320/0x320 [ 27.689720] ? rcu_note_context_switch+0x710/0x710 [ 27.694639] ? __might_sleep+0x95/0x190 [ 27.698600] ? kasan_check_write+0x14/0x20 [ 27.702823] ? __mutex_lock+0x7d9/0x17f0 [ 27.706865] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.712206] ? __x64_sys_epoll_ctl+0x518/0x10f0 [ 27.716855] ? mutex_trylock+0x2a0/0x2a0 [ 27.720895] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.725886] ? graph_lock+0x170/0x170 [ 27.729664] ? pud_val+0x80/0xf0 [ 27.733007] ? pmd_val+0xf0/0xf0 [ 27.736369] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.741887] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.747403] ? __handle_mm_fault+0x93a/0x4390 [ 27.751879] ? find_held_lock+0x36/0x1c0 [ 27.755920] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.761432] ? __fget_light+0x2ef/0x430 [ 27.765386] ? fget_raw+0x20/0x20 [ 27.768818] ? find_held_lock+0x36/0x1c0 [ 27.772859] ? __might_sleep+0x95/0x190 [ 27.776827] ? clear_tfile_check_list+0x380/0x380 [ 27.781649] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 27.786816] __x64_sys_epoll_ctl+0xef1/0x10f0 [ 27.791301] ? __ia32_sys_epoll_create+0x70/0x70 [ 27.796040] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.801562] ? __do_page_fault+0x441/0xe40 [ 27.805774] ? mm_fault_error+0x380/0x380 [ 27.809903] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 27.814732] ? do_syscall_64+0x92/0x800 [ 27.818689] do_syscall_64+0x1b1/0x800 [ 27.822565] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.827480] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.832389] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.837901] ? retint_user+0x18/0x18 [ 27.841594] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.846425] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.851592] RIP: 0033:0x43fd09 [ 27.854758] 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 [ 27.873875] RSP: 002b:00007ffe09f510e8 EFLAGS: 00000203 ORIG_RAX: 00000000000000e9 [ 27.882041] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd09 [ 27.889310] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 [ 27.896571] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 27.903826] R10: 0000000020c85000 R11: 0000000000000203 R12: 0000000000401630 [ 27.911087] R13: 00000000004016c0 R14: 0000000000000000 R15: 0000000000000000 [ 27.918339] Modules linked in: [ 27.921510] Dumping ftrace buffer: [ 27.925037] (ftrace buffer empty) [ 27.928742] CR2: 0000000000000000 [ 27.932273] ---[ end trace fe4cd39a9bb775c5 ]--- [ 27.937055] RIP: 0010: (null) [ 27.940947] Code: Bad RIP value. [ 27.944357] RSP: 0018:ffff8801ad05f3a0 EFLAGS: 00010246 [ 27.949734] RAX: 0000000000000000 RBX: ffff8801d0600800 RCX: 1ffffffff10ea8e5 [ 27.957030] RDX: ffff8801ad05fc00 RSI: ffff8801a9280000 RDI: ffff8801d957b000 [ 27.964311] RBP: ffff8801ad05f510 R08: ffff8801d958cdf8 R09: 0000000000000006 [ 27.971579] R10: ffff8801d958c5c0 R11: 0000000000000000 R12: 1ffff10035a0be79 [ 27.978846] R13: ffff8801ad05fc00 R14: ffff8801d0600812 R15: ffff8801d0600c58 [ 27.986114] FS: 0000000001dcd880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 27.994336] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.000386] CR2: ffffffffffffffd6 CR3: 00000001ad646000 CR4: 00000000001406f0 [ 28.007665] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.014939] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.022203] Kernel panic - not syncing: Fatal exception [ 28.027981] Dumping ftrace buffer: [ 28.031509] (ftrace buffer empty) [ 28.035194] Kernel Offset: disabled [ 28.038796] Rebooting in 86400 seconds..