[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.637646] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.512238] random: sshd: uninitialized urandom read (32 bytes read) [ 20.744827] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.518405] random: sshd: uninitialized urandom read (32 bytes read) [ 21.676255] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.11' (ECDSA) to the list of known hosts. [ 27.177305] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/03 20:58:52 parsed 1 programs 2018/05/03 20:58:52 executed programs: 0 [ 27.648656] IPVS: ftp: loaded support on port[0] = 21 [ 27.704386] FAULT_INJECTION: forcing a failure. [ 27.704386] name fail_page_alloc, interval 1, probability 0, space 0, times 1 [ 27.716387] CPU: 0 PID: 4524 Comm: syz-executor0 Not tainted 4.17.0-rc3+ #31 [ 27.723564] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.732903] Call Trace: [ 27.735480] dump_stack+0x1b9/0x294 [ 27.739097] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.744275] ? zap_class+0x720/0x720 [ 27.747984] should_fail.cold.4+0xa/0x1a [ 27.752045] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 27.757134] ? __lock_is_held+0xb5/0x140 [ 27.761182] ? graph_lock+0x170/0x170 [ 27.764970] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 27.769980] ? find_held_lock+0x36/0x1c0 [ 27.774045] ? __lock_is_held+0xb5/0x140 [ 27.778107] ? check_same_owner+0x320/0x320 [ 27.782425] ? rcu_note_context_switch+0x710/0x710 [ 27.787349] ? __might_sleep+0x95/0x190 [ 27.791313] __alloc_pages_nodemask+0x34e/0xd70 [ 27.795980] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 27.800995] ? kimage_free_page_list+0x300/0x300 [ 27.805746] ? kimage_free_page_list+0x209/0x300 [ 27.810498] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 27.816039] ? kimage_is_destination_range+0x140/0x140 [ 27.821399] ? alloc_pages_current+0x114/0x210 [ 27.825978] ? arch_kexec_post_alloc_pages+0x9/0x10 [ 27.830984] ? kimage_alloc_pages+0xf7/0x120 [ 27.835392] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 27.840927] alloc_pages_current+0x10c/0x210 [ 27.845328] ? arch_kexec_pre_free_pages+0xea0/0xea0 [ 27.850427] __get_free_pages+0xf/0x40 [ 27.854301] get_zeroed_page+0x11/0x20 [ 27.858176] machine_kexec_prepare+0x971/0xed0 [ 27.862760] ? alloc_pgt_page+0x50/0x50 [ 27.866721] ? kexec_mark_crashkres+0x1a0/0x1a0 [ 27.871390] do_kexec_load+0x3c9/0x790 [ 27.875281] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 27.881160] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.886704] ? ns_capable_common+0x13f/0x170 [ 27.891111] __x64_sys_kexec_load+0x1bf/0x230 [ 27.895602] do_syscall_64+0x1b1/0x800 [ 27.899480] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 27.904313] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.909248] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.914173] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.919528] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.924367] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.929540] RIP: 0033:0x455979 [ 27.932714] RSP: 002b:00007ffdca50c2b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 27.940413] RAX: ffffffffffffffda RBX: 0000000002891914 RCX: 0000000000455979 [ 27.947674] RDX: 00000000200001c0 RSI: 0000000000000001 RDI: 0000000000000000 [ 27.954929] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 27.962183] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 27.969441] R13: 0000000000000403 R14: 00000000006fa0e8 R15: 0000000000000005 [ 27.976889] page:ffffea0006b6e740 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 27.985113] flags: 0x2fffc0000000000() [ 27.989083] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 27.997063] raw: ffffea0006b60aa0 ffff8801dae2fdd8 0000000000000000 0000000000000000 [ 28.005000] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [ 28.012231] ------------[ cut here ]------------ [ 28.016984] kernel BUG at include/linux/mm.h:492! [ 28.021884] invalid opcode: 0000 [#1] SMP KASAN [ 28.026554] Dumping ftrace buffer: [ 28.030081] (ftrace buffer empty) [ 28.033773] Modules linked in: [ 28.036956] CPU: 0 PID: 4524 Comm: syz-executor0 Not tainted 4.17.0-rc3+ #31 [ 28.044130] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.053486] RIP: 0010:__free_pages+0x14f/0x180 [ 28.058059] RSP: 0018:ffff8801ad01fc08 EFLAGS: 00010203 [ 28.063418] RAX: 0000000000000000 RBX: 1ffff10035a03f82 RCX: 0000000000000000 [ 28.070671] RDX: 0000000000000000 RSI: ffffffff81a5b2e5 RDI: ffffed0035a03f70 [ 28.077925] RBP: ffff8801ad01fc98 R08: ffff8801ad09e740 R09: ffffed003b5c4fb0 [ 28.085180] R10: ffffed003b5c4fb0 R11: ffff8801dae27d87 R12: ffffea0006b6e740 [ 28.092443] R13: 1ffff10035a03f86 R14: ffff8801ad01fc70 R15: ffffea0006b6e75c [ 28.099698] FS: 0000000002891940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 28.107905] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.113784] CR2: 00000000004d9fc4 CR3: 00000001ad7ed000 CR4: 00000000001406f0 [ 28.121042] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.128295] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.135550] Call Trace: [ 28.138130] ? free_unref_page+0x9d0/0x9d0 [ 28.142350] ? kimage_free_page_list+0x209/0x300 [ 28.147094] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.152618] free_pages+0x50/0x90 [ 28.156063] free_transition_pgtable+0x68/0xf0 [ 28.160640] machine_kexec_cleanup+0x9/0x10 [ 28.164950] kimage_free+0x1f2/0x270 [ 28.168652] do_kexec_load+0x53a/0x790 [ 28.172531] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 28.178329] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.183951] ? ns_capable_common+0x13f/0x170 [ 28.188357] __x64_sys_kexec_load+0x1bf/0x230 [ 28.192842] do_syscall_64+0x1b1/0x800 [ 28.196712] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 28.201547] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.206464] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.211384] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.216736] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.221575] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.226748] RIP: 0033:0x455979 [ 28.230049] RSP: 002b:00007ffdca50c2b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 28.237742] RAX: ffffffffffffffda RBX: 0000000002891914 RCX: 0000000000455979 [ 28.245002] RDX: 00000000200001c0 RSI: 0000000000000001 RDI: 0000000000000000 [ 28.252261] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 28.259522] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 28.266774] R13: 0000000000000403 R14: 00000000006fa0e8 R15: 0000000000000005 [ 28.274043] 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 66 d0 87 4c 89 e7 e8 81 7a 0d 00 <0f> 0b 4c 89 ef 89 85 70 ff ff ff e8 51 7b 1d 00 8b 85 70 ff ff [ 28.293350] RIP: __free_pages+0x14f/0x180 RSP: ffff8801ad01fc08 [ 28.299463] ---[ end trace dbb114ab9bd59585 ]--- [ 28.304710] Kernel panic - not syncing: Fatal exception [ 28.310863] Dumping ftrace buffer: [ 28.314404] (ftrace buffer empty) [ 28.318095] Kernel Offset: disabled [ 28.321719] Rebooting in 86400 seconds..