[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.084634] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.908104] random: sshd: uninitialized urandom read (32 bytes read) [ 25.172856] random: sshd: uninitialized urandom read (32 bytes read) [ 25.949920] random: sshd: uninitialized urandom read (32 bytes read) [ 26.113485] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts. [ 31.523652] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/13 14:51:35 parsed 1 programs 2018/05/13 14:51:35 executed programs: 0 [ 32.032382] IPVS: ftp: loaded support on port[0] = 21 [ 32.079529] FAULT_INJECTION: forcing a failure. [ 32.079529] name fail_page_alloc, interval 1, probability 0, space 0, times 1 [ 32.091649] CPU: 0 PID: 4513 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #45 [ 32.098826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.108170] Call Trace: [ 32.110755] dump_stack+0x1b9/0x294 [ 32.114388] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.119596] ? __lock_is_held+0xb5/0x140 [ 32.123653] should_fail.cold.4+0xa/0x1a [ 32.127699] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 32.132786] ? __lock_is_held+0xb5/0x140 [ 32.136838] ? graph_lock+0x170/0x170 [ 32.140625] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 32.145647] ? find_held_lock+0x36/0x1c0 [ 32.149691] ? __lock_is_held+0xb5/0x140 [ 32.153755] ? check_same_owner+0x320/0x320 [ 32.158072] ? rcu_note_context_switch+0x710/0x710 [ 32.162987] ? __might_sleep+0x95/0x190 [ 32.166955] __alloc_pages_nodemask+0x34e/0xd70 [ 32.171614] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 32.176628] ? kimage_free_page_list+0x300/0x300 [ 32.181370] ? kimage_free_page_list+0x209/0x300 [ 32.186120] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 32.191645] ? kimage_is_destination_range+0x140/0x140 [ 32.196907] ? alloc_pages_current+0x114/0x210 [ 32.201478] ? arch_kexec_post_alloc_pages+0x9/0x10 [ 32.206477] ? kimage_alloc_pages+0xf7/0x120 [ 32.210873] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 32.216412] alloc_pages_current+0x10c/0x210 [ 32.220820] ? arch_kexec_pre_free_pages+0xdf0/0xdf0 [ 32.225921] __get_free_pages+0xf/0x40 [ 32.229793] get_zeroed_page+0x11/0x20 [ 32.233678] machine_kexec_prepare+0x971/0xed0 [ 32.238267] ? alloc_pgt_page+0x50/0x50 [ 32.242233] ? kexec_mark_crashkres+0x1a0/0x1a0 [ 32.246895] do_kexec_load+0x3c9/0x790 [ 32.250770] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 32.256563] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.262088] ? ns_capable_common+0x13f/0x170 [ 32.266482] __x64_sys_kexec_load+0x1bf/0x230 [ 32.270968] do_syscall_64+0x1b1/0x800 [ 32.274850] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.279687] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.284618] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.289548] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.295328] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.300159] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.305504] RIP: 0033:0x455979 [ 32.308674] RSP: 002b:00007fff73abc518 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 32.316377] RAX: ffffffffffffffda RBX: 00000000026d0914 RCX: 0000000000455979 [ 32.323630] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000 [ 32.330880] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 32.338143] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 [ 32.345399] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 32.352775] page:ffffea0006b356c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 32.360952] flags: 0x2fffc0000000000() [ 32.364882] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 32.372790] raw: ffffea0006b33220 ffff8801dae2fdd8 0000000000000000 0000000000000000 [ 32.381046] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [ 32.388223] ------------[ cut here ]------------ [ 32.393226] kernel BUG at include/linux/mm.h:492! [ 32.398104] invalid opcode: 0000 [#1] SMP KASAN [ 32.402773] Dumping ftrace buffer: [ 32.406294] (ftrace buffer empty) [ 32.409984] Modules linked in: [ 32.413164] CPU: 0 PID: 4513 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #45 [ 32.420329] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.429677] RIP: 0010:__free_pages+0x14f/0x180 [ 32.434234] RSP: 0018:ffff8801d9697c08 EFLAGS: 00010203 [ 32.439575] RAX: 0000000000000000 RBX: 1ffff1003b2d2f82 RCX: 0000000000000000 [ 32.446823] RDX: 0000000000000000 RSI: ffffffff81a5b8b5 RDI: ffffed003b2d2f70 [ 32.454070] RBP: ffff8801d9697c98 R08: ffff8801acfd66c0 R09: ffffed003b5c4fb0 [ 32.461320] R10: ffffed003b5c4fb0 R11: ffff8801dae27d87 R12: ffffea0006b356c0 [ 32.468568] R13: 1ffff1003b2d2f86 R14: ffff8801d9697c70 R15: ffffea0006b356dc [ 32.475818] FS: 00000000026d0940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 32.484024] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.489887] CR2: 00000000004daa24 CR3: 00000001d0af1000 CR4: 00000000001406f0 [ 32.497140] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.504389] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.511645] Call Trace: [ 32.514219] ? free_unref_page+0x9d0/0x9d0 [ 32.518435] ? kimage_free_page_list+0x209/0x300 [ 32.523174] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.528701] free_pages+0x50/0x90 [ 32.532137] free_transition_pgtable+0x68/0xf0 [ 32.536702] machine_kexec_cleanup+0x9/0x10 [ 32.541001] kimage_free+0x1f2/0x270 [ 32.544693] do_kexec_load+0x53a/0x790 [ 32.548564] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 32.554341] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.559855] ? ns_capable_common+0x13f/0x170 [ 32.564242] __x64_sys_kexec_load+0x1bf/0x230 [ 32.568718] do_syscall_64+0x1b1/0x800 [ 32.572584] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.577408] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.582316] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.587240] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.592585] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.597415] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.602585] RIP: 0033:0x455979 [ 32.605756] RSP: 002b:00007fff73abc518 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 32.613450] RAX: ffffffffffffffda RBX: 00000000026d0914 RCX: 0000000000455979 [ 32.620698] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000 [ 32.627958] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 32.635204] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 [ 32.642466] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 32.649717] Code: 68 5b 41 5c 41 5d 41 5e 41 5f 5d c3 8b b5 74 ff ff ff 4c 89 e7 e8 02 87 ff ff eb c6 48 c7 c6 00 68 d0 87 4c 89 e7 e8 21 7b 0d 00 <0f> 0b 4c 89 ef 89 85 70 ff ff ff e8 b1 7d 1d 00 8b 85 70 ff ff [ 32.668854] RIP: __free_pages+0x14f/0x180 RSP: ffff8801d9697c08 [ 32.674954] ---[ end trace 23f7526d32b4a683 ]--- [ 32.679720] Kernel panic - not syncing: Fatal exception [ 32.685477] Dumping ftrace buffer: [ 32.688999] (ftrace buffer empty) [ 32.692692] Kernel Offset: disabled [ 32.696304] Rebooting in 86400 seconds..