[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.459386] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.007507] random: sshd: uninitialized urandom read (32 bytes read) [ 20.295945] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.056048] random: sshd: uninitialized urandom read (32 bytes read) [ 21.216451] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.57' (ECDSA) to the list of known hosts. [ 26.660999] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/15 14:48:41 parsed 1 programs 2018/05/15 14:48:41 executed programs: 0 [ 27.179249] IPVS: ftp: loaded support on port[0] = 21 [ 27.227404] FAULT_INJECTION: forcing a failure. [ 27.227404] name fail_page_alloc, interval 1, probability 0, space 0, times 1 [ 27.239452] CPU: 0 PID: 4547 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #51 [ 27.246633] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.255977] Call Trace: [ 27.258551] dump_stack+0x1b9/0x294 [ 27.262186] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.267400] ? __lock_is_held+0xb5/0x140 [ 27.271451] should_fail.cold.4+0xa/0x1a [ 27.275495] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 27.280576] ? __lock_is_held+0xb5/0x140 [ 27.284617] ? graph_lock+0x170/0x170 [ 27.289272] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 27.294286] ? find_held_lock+0x36/0x1c0 [ 27.298334] ? __lock_is_held+0xb5/0x140 [ 27.302397] ? check_same_owner+0x320/0x320 [ 27.306712] ? kimage_free_page_list+0x209/0x300 [ 27.311460] ? rcu_note_context_switch+0x710/0x710 [ 27.316375] ? __might_sleep+0x95/0x190 [ 27.320334] __alloc_pages_nodemask+0x34e/0xd70 [ 27.325165] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 27.330167] ? kimage_free_page_list+0x300/0x300 [ 27.334914] ? kimage_free_page_list+0x209/0x300 [ 27.339668] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 27.345193] ? kimage_is_destination_range+0x140/0x140 [ 27.350452] ? alloc_pages_current+0x114/0x210 [ 27.355279] ? arch_kexec_post_alloc_pages+0x9/0x10 [ 27.360284] ? kimage_alloc_pages+0xf7/0x120 [ 27.364681] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 27.370202] alloc_pages_current+0x10c/0x210 [ 27.374596] ? arch_kexec_pre_free_pages+0xdb0/0xdb0 [ 27.379687] __get_free_pages+0xf/0x40 [ 27.383565] get_zeroed_page+0x11/0x20 [ 27.387440] machine_kexec_prepare+0x4b3/0xed0 [ 27.392009] ? alloc_pgt_page+0x50/0x50 [ 27.395981] ? kexec_mark_crashkres+0x1a0/0x1a0 [ 27.400636] do_kexec_load+0x3c9/0x790 [ 27.404508] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 27.410291] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.415819] ? ns_capable_common+0x13f/0x170 [ 27.420221] __x64_sys_kexec_load+0x1bf/0x230 [ 27.424706] do_syscall_64+0x1b1/0x800 [ 27.428576] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 27.433407] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.438320] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.443234] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.448581] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.453406] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.458590] RIP: 0033:0x455a09 [ 27.461762] RSP: 002b:00007ffe339eb898 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 27.469456] RAX: ffffffffffffffda RBX: 0000000001820914 RCX: 0000000000455a09 [ 27.476715] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000 [ 27.483965] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 27.491213] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 27.498461] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 27.520665] FAULT_INJECTION: forcing a failure. [ 27.520665] name fail_page_alloc, interval 1, probability 0, space 0, times 0 [ 27.532628] CPU: 0 PID: 4549 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #51 [ 27.539803] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.549138] Call Trace: [ 27.551714] dump_stack+0x1b9/0x294 [ 27.555327] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.560498] ? __lock_is_held+0xb5/0x140 [ 27.564542] should_fail.cold.4+0xa/0x1a [ 27.568586] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 27.573671] ? __lock_is_held+0xb5/0x140 [ 27.577711] ? graph_lock+0x170/0x170 [ 27.581496] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 27.586497] ? find_held_lock+0x36/0x1c0 [ 27.590538] ? __lock_is_held+0xb5/0x140 [ 27.594587] ? check_same_owner+0x320/0x320 [ 27.598899] ? rcu_note_context_switch+0x710/0x710 [ 27.603812] ? __might_sleep+0x95/0x190 [ 27.607768] __alloc_pages_nodemask+0x34e/0xd70 [ 27.612432] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 27.617436] ? kimage_free_page_list+0x300/0x300 [ 27.622176] ? kimage_free_page_list+0x209/0x300 [ 27.626923] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 27.632458] ? kimage_is_destination_range+0x140/0x140 [ 27.637719] ? alloc_pages_current+0x114/0x210 [ 27.642286] ? arch_kexec_post_alloc_pages+0x9/0x10 [ 27.647284] ? kimage_alloc_pages+0xf7/0x120 [ 27.651681] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 27.657291] alloc_pages_current+0x10c/0x210 [ 27.661770] ? arch_kexec_pre_free_pages+0xdb0/0xdb0 [ 27.666857] __get_free_pages+0xf/0x40 [ 27.670745] get_zeroed_page+0x11/0x20 [ 27.674619] machine_kexec_prepare+0x971/0xed0 [ 27.679184] ? alloc_pgt_page+0x50/0x50 [ 27.683141] ? kexec_mark_crashkres+0x1a0/0x1a0 [ 27.687821] do_kexec_load+0x3c9/0x790 [ 27.691715] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 27.697506] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.703035] ? ns_capable_common+0x13f/0x170 [ 27.707434] __x64_sys_kexec_load+0x1bf/0x230 [ 27.711918] do_syscall_64+0x1b1/0x800 [ 27.715806] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.720734] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.725656] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.731006] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.735848] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.741030] RIP: 0033:0x455a09 [ 27.744200] RSP: 002b:00007ffe339eb898 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 27.751895] RAX: ffffffffffffffda RBX: 0000000001820914 RCX: 0000000000455a09 [ 27.759149] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000 [ 27.766405] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 27.773655] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 27.780906] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 27.788300] page:ffffea0006b5e800 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 27.796514] flags: 0x2fffc0000000000() [ 27.800446] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 27.808452] raw: ffffea0006b5e860 ffff8801dae2fdd8 0000000000000000 0000000000000000 [ 27.816361] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [ 27.823478] ------------[ cut here ]------------ [ 27.828219] kernel BUG at include/linux/mm.h:492! [ 27.833104] invalid opcode: 0000 [#1] SMP KASAN [ 27.837768] Dumping ftrace buffer: [ 27.841292] (ftrace buffer empty) [ 27.844980] Modules linked in: [ 27.848172] CPU: 0 PID: 4549 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #51 [ 27.855341] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.864687] RIP: 0010:__free_pages+0x14f/0x180 [ 27.869245] RSP: 0018:ffff8801adbbfc08 EFLAGS: 00010203 [ 27.874585] RAX: 0000000000000000 RBX: 1ffff10035b77f82 RCX: 0000000000000000 [ 27.881835] RDX: 0000000000000000 RSI: ffffffff81a5b9e5 RDI: ffffed0035b77f70 [ 27.889085] RBP: ffff8801adbbfc98 R08: ffff8801ad75c040 R09: ffffed003b5c4fb0 [ 27.896335] R10: ffffed003b5c4fb0 R11: ffff8801dae27d87 R12: ffffea0006b5e800 [ 27.903599] R13: 1ffff10035b77f86 R14: ffff8801adbbfc70 R15: ffffea0006b5e81c [ 27.910851] FS: 0000000001820940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 27.919053] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.924914] CR2: 00000000004daac4 CR3: 00000001adc08000 CR4: 00000000001406f0 [ 27.932166] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.939414] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.946661] Call Trace: [ 27.949234] ? free_unref_page+0x9d0/0x9d0 [ 27.953454] ? kimage_free_page_list+0x209/0x300 [ 27.958194] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.963709] free_pages+0x50/0x90 [ 27.967150] free_transition_pgtable+0x68/0xf0 [ 27.971711] machine_kexec_cleanup+0x9/0x10 [ 27.976017] kimage_free+0x1f2/0x270 [ 27.979717] do_kexec_load+0x53a/0x790 [ 27.983587] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 27.989367] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.994888] ? ns_capable_common+0x13f/0x170 [ 27.999294] __x64_sys_kexec_load+0x1bf/0x230 [ 28.003772] do_syscall_64+0x1b1/0x800 [ 28.007638] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.012545] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.017471] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.022816] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.027638] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.032816] RIP: 0033:0x455a09 [ 28.035982] RSP: 002b:00007ffe339eb898 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 28.043692] RAX: ffffffffffffffda RBX: 0000000001820914 RCX: 0000000000455a09 [ 28.050947] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000 [ 28.058213] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 28.065468] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 28.072736] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 28.079985] 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 80 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 [ 28.099142] RIP: __free_pages+0x14f/0x180 RSP: ffff8801adbbfc08 [ 28.105240] ---[ end trace 172b9428952db989 ]--- [ 28.110034] Kernel panic - not syncing: Fatal exception [ 28.115927] Dumping ftrace buffer: [ 28.119447] (ftrace buffer empty) [ 28.123132] Kernel Offset: disabled [ 28.126736] Rebooting in 86400 seconds..