[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.728807] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.733006] random: sshd: uninitialized urandom read (32 bytes read) [ 26.179603] random: sshd: uninitialized urandom read (32 bytes read) [ 26.984982] random: sshd: uninitialized urandom read (32 bytes read) [ 29.964580] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 35.366500] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/11 08:29:51 parsed 1 programs 2018/05/11 08:29:51 executed programs: 0 [ 35.851781] IPVS: ftp: loaded support on port[0] = 21 [ 35.900377] FAULT_INJECTION: forcing a failure. [ 35.900377] name fail_page_alloc, interval 1, probability 0, space 0, times 1 [ 35.912417] CPU: 0 PID: 4569 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #40 [ 35.919593] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.928936] Call Trace: [ 35.931904] dump_stack+0x1b9/0x294 [ 35.935519] ? dump_stack_print_info.cold.2+0x52/0x52 [ 35.940697] ? __lock_is_held+0xb5/0x140 [ 35.944746] should_fail.cold.4+0xa/0x1a [ 35.948790] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 35.953879] ? __lock_is_held+0xb5/0x140 [ 35.957922] ? graph_lock+0x170/0x170 [ 35.961707] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 35.966716] ? find_held_lock+0x36/0x1c0 [ 35.970764] ? __lock_is_held+0xb5/0x140 [ 35.974825] ? check_same_owner+0x320/0x320 [ 35.979143] ? rcu_note_context_switch+0x710/0x710 [ 35.984068] ? __might_sleep+0x95/0x190 [ 35.988045] __alloc_pages_nodemask+0x34e/0xd70 [ 35.992709] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 35.997716] ? kimage_free_page_list+0x300/0x300 [ 36.002456] ? kimage_free_page_list+0x209/0x300 [ 36.007200] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 36.012721] ? kimage_is_destination_range+0x140/0x140 [ 36.017989] ? alloc_pages_current+0x114/0x210 [ 36.022560] ? arch_kexec_post_alloc_pages+0x9/0x10 [ 36.027569] ? kimage_alloc_pages+0xf7/0x120 [ 36.031978] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 36.037507] alloc_pages_current+0x10c/0x210 [ 36.041906] ? arch_kexec_pre_free_pages+0xdf0/0xdf0 [ 36.046997] __get_free_pages+0xf/0x40 [ 36.050871] get_zeroed_page+0x11/0x20 [ 36.054750] machine_kexec_prepare+0x971/0xed0 [ 36.059319] ? alloc_pgt_page+0x50/0x50 [ 36.063278] ? kexec_mark_crashkres+0x1a0/0x1a0 [ 36.067959] do_kexec_load+0x3c9/0x790 [ 36.071836] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 36.077628] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.083157] ? ns_capable_common+0x13f/0x170 [ 36.087553] __x64_sys_kexec_load+0x1bf/0x230 [ 36.092052] do_syscall_64+0x1b1/0x800 [ 36.095930] ? syscall_return_slowpath+0x5c0/0x5c0 [ 36.100864] ? syscall_return_slowpath+0x30f/0x5c0 [ 36.105793] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 36.111146] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.115973] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.121143] RIP: 0033:0x455979 [ 36.124313] RSP: 002b:00007ffc9fd908e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 36.132005] RAX: ffffffffffffffda RBX: 00000000024b8914 RCX: 0000000000455979 [ 36.139268] RDX: 00000000200016c0 RSI: 0000000000000001 RDI: 0000000000000000 [ 36.146955] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 36.155600] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 36.162862] R13: 0000000000000403 R14: 00000000006fa0e8 R15: 0000000000000005 [ 36.170228] page:ffffea000765af40 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 36.178417] flags: 0x2fffc0000000000() [ 36.182349] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 36.190297] raw: ffffea0007658ca0 ffff8801dae2fdd8 0000000000000000 0000000000000000 [ 36.198497] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [ 36.205606] ------------[ cut here ]------------ [ 36.210351] kernel BUG at include/linux/mm.h:492! [ 36.215227] invalid opcode: 0000 [#1] SMP KASAN [ 36.219895] Dumping ftrace buffer: [ 36.223420] (ftrace buffer empty) [ 36.227110] Modules linked in: [ 36.230287] CPU: 0 PID: 4569 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #40 [ 36.237452] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.246801] RIP: 0010:__free_pages+0x14f/0x180 [ 36.251374] RSP: 0018:ffff8801d927fc08 EFLAGS: 00010203 [ 36.256718] RAX: 0000000000000000 RBX: 1ffff1003b24ff82 RCX: 0000000000000000 [ 36.264067] RDX: 0000000000000000 RSI: ffffffff81a5b965 RDI: ffffed003b24ff70 [ 36.271319] RBP: ffff8801d927fc98 R08: ffff8801d96de1c0 R09: ffffed003b5c4fb0 [ 36.278588] R10: ffffed003b5c4fb0 R11: ffff8801dae27d87 R12: ffffea000765af40 [ 36.285845] R13: 1ffff1003b24ff86 R14: ffff8801d927fc70 R15: ffffea000765af5c [ 36.293136] FS: 00000000024b8940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 36.301344] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.307207] CR2: 00000000004d9fe4 CR3: 00000001d9221000 CR4: 00000000001406f0 [ 36.314479] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.321741] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.328996] Call Trace: [ 36.331581] ? free_unref_page+0x9d0/0x9d0 [ 36.335903] ? kimage_free_page_list+0x209/0x300 [ 36.340652] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 36.346174] free_pages+0x50/0x90 [ 36.349615] free_transition_pgtable+0x68/0xf0 [ 36.354186] machine_kexec_cleanup+0x9/0x10 [ 36.358494] kimage_free+0x1f2/0x270 [ 36.362203] do_kexec_load+0x53a/0x790 [ 36.366076] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 36.371860] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.377391] ? ns_capable_common+0x13f/0x170 [ 36.381785] __x64_sys_kexec_load+0x1bf/0x230 [ 36.386265] do_syscall_64+0x1b1/0x800 [ 36.390135] ? syscall_return_slowpath+0x5c0/0x5c0 [ 36.395049] ? syscall_return_slowpath+0x30f/0x5c0 [ 36.399962] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 36.405316] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.410142] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.415318] RIP: 0033:0x455979 [ 36.418490] RSP: 002b:00007ffc9fd908e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 36.426177] RAX: ffffffffffffffda RBX: 00000000024b8914 RCX: 0000000000455979 [ 36.435422] RDX: 00000000200016c0 RSI: 0000000000000001 RDI: 0000000000000000 [ 36.442672] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 36.449923] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 36.457173] R13: 0000000000000403 R14: 00000000006fa0e8 R15: 0000000000000005 [ 36.464422] 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 d1 7a 0d 00 <0f> 0b 4c 89 ef 89 85 70 ff ff ff e8 a1 7b 1d 00 8b 85 70 ff ff [ 36.483563] RIP: __free_pages+0x14f/0x180 RSP: ffff8801d927fc08 [ 36.489649] ---[ end trace 0e2cb386eead3eb8 ]--- [ 36.494425] Kernel panic - not syncing: Fatal exception [ 36.500311] Dumping ftrace buffer: [ 36.503834] (ftrace buffer empty) [ 36.507520] Kernel Offset: disabled [ 36.511125] Rebooting in 86400 seconds..