[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.183883] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.925305] random: sshd: uninitialized urandom read (32 bytes read) [ 23.332730] random: sshd: uninitialized urandom read (32 bytes read) [ 24.149080] random: sshd: uninitialized urandom read (32 bytes read) [ 28.520297] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 33.930408] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.019867] WARNING: CPU: 1 PID: 4537 at mm/slab_common.c:996 kmalloc_slab+0x56/0x70 [ 34.027818] Kernel panic - not syncing: panic_on_warn set ... [ 34.027818] [ 34.035169] CPU: 1 PID: 4537 Comm: syz-executor849 Not tainted 4.17.0+ #92 [ 34.042165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.051500] Call Trace: [ 34.054080] dump_stack+0x1b9/0x294 [ 34.057691] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.062867] ? slab_caches_to_rcu_destroy_workfn+0x30/0xc0 [ 34.068477] panic+0x22f/0x4de [ 34.071652] ? add_taint.cold.5+0x16/0x16 [ 34.075787] ? __warn.cold.8+0x148/0x1b3 [ 34.079827] ? __warn.cold.8+0x117/0x1b3 [ 34.083902] ? kmalloc_slab+0x56/0x70 [ 34.087689] __warn.cold.8+0x163/0x1b3 [ 34.091555] ? kmalloc_slab+0x56/0x70 [ 34.095339] report_bug+0x252/0x2d0 [ 34.098949] do_error_trap+0x1fc/0x4d0 [ 34.102827] ? math_error+0x3f0/0x3f0 [ 34.106615] ? find_held_lock+0x36/0x1c0 [ 34.110658] ? print_usage_bug+0xc0/0xc0 [ 34.114709] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.119534] do_invalid_op+0x1b/0x20 [ 34.123230] invalid_op+0x14/0x20 [ 34.126666] RIP: 0010:kmalloc_slab+0x56/0x70 [ 34.131046] Code: c5 c0 ca d0 88 5d c3 b8 10 00 00 00 48 85 ff 74 f4 83 ef 01 c1 ef 03 0f b6 87 e0 c9 d0 88 eb d8 31 c0 81 e6 00 02 00 00 75 db <0f> 0b 5d c3 48 8b 04 c5 00 ca d0 88 5d c3 66 90 66 2e 0f 1f 84 00 [ 34.150217] RSP: 0018:ffff8801acc67998 EFLAGS: 00010246 [ 34.155567] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff877abea2 [ 34.162828] RDX: 1ffff10035e17ce3 RSI: 0000000000000000 RDI: 0000000001000010 [ 34.170102] RBP: ffff8801acc67998 R08: ffff8801d91d82c0 R09: ffffed0035e17cd9 [ 34.177355] R10: ffffed0035e17cd9 R11: ffff8801af0be6cb R12: dffffc0000000000 [ 34.184611] R13: 0000000020000000 R14: ffff8801af0be6b0 R15: 00000000006080c0 [ 34.191877] ? xdp_umem_create+0x582/0x10f0 [ 34.196191] __kmalloc+0x25/0x760 [ 34.199625] ? security_capable+0x99/0xc0 [ 34.203754] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.209268] ? xdp_umem_create+0x5c9/0x10f0 [ 34.213568] ? ns_capable_common+0x13f/0x170 [ 34.217958] xdp_umem_create+0x5c9/0x10f0 [ 34.222092] ? xdp_put_umem+0x240/0x240 [ 34.226061] ? check_same_owner+0x320/0x320 [ 34.230364] ? find_held_lock+0x36/0x1c0 [ 34.234416] ? __might_sleep+0x95/0x190 [ 34.238380] xsk_setsockopt+0x443/0x550 [ 34.242335] ? xsk_init_queue+0xf0/0xf0 [ 34.246293] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 34.251813] ? handle_mm_fault+0x55a/0xc70 [ 34.256047] ? security_socket_setsockopt+0x94/0xc0 [ 34.261053] __sys_setsockopt+0x1bd/0x390 [ 34.265185] ? kernel_accept+0x310/0x310 [ 34.269242] ? mm_fault_error+0x380/0x380 [ 34.273375] ? __ia32_sys_fallocate+0xf0/0xf0 [ 34.277855] __x64_sys_setsockopt+0xbe/0x150 [ 34.282246] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 34.287243] do_syscall_64+0x1b1/0x800 [ 34.291110] ? syscall_return_slowpath+0x5c0/0x5c0 [ 34.296030] ? syscall_return_slowpath+0x30f/0x5c0 [ 34.300956] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.306473] ? retint_user+0x18/0x18 [ 34.310180] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.315009] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.320185] RIP: 0033:0x43fce9 [ 34.323349] 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 [ 34.342529] RSP: 002b:00007ffedcafaac8 EFLAGS: 00000213 ORIG_RAX: 0000000000000036 [ 34.350220] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fce9 [ 34.357471] RDX: 0000000000000004 RSI: 000000000000011b RDI: 0000000000000003 [ 34.364727] RBP: 00000000006ca018 R08: 0000000000000018 R09: 00000000004002c8 [ 34.371976] R10: 0000000020000040 R11: 0000000000000213 R12: 0000000000401610 [ 34.379221] R13: 00000000004016a0 R14: 0000000000000000 R15: 0000000000000000 [ 34.387774] Dumping ftrace buffer: [ 34.391404] (ftrace buffer empty) [ 34.395094] Kernel Offset: disabled [ 34.398700] Rebooting in 86400 seconds..