[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.768779] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.954525] random: sshd: uninitialized urandom read (32 bytes read) [ 21.169352] random: sshd: uninitialized urandom read (32 bytes read) [ 21.923007] random: sshd: uninitialized urandom read (32 bytes read) [ 22.100000] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.21' (ECDSA) to the list of known hosts. [ 27.484163] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/13 05:51:53 parsed 1 programs 2018/05/13 05:51:53 executed programs: 0 [ 27.981137] IPVS: ftp: loaded support on port[0] = 21 [ 28.025627] FAULT_INJECTION: forcing a failure. [ 28.025627] name fail_page_alloc, interval 1, probability 0, space 0, times 1 [ 28.037575] CPU: 1 PID: 4498 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #44 [ 28.044746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.054079] Call Trace: [ 28.056651] dump_stack+0x1b9/0x294 [ 28.060262] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.065439] ? __lock_is_held+0xb5/0x140 [ 28.069484] should_fail.cold.4+0xa/0x1a [ 28.073526] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 28.078607] ? __lock_is_held+0xb5/0x140 [ 28.082655] ? graph_lock+0x170/0x170 [ 28.086447] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 28.091454] ? find_held_lock+0x36/0x1c0 [ 28.095498] ? __lock_is_held+0xb5/0x140 [ 28.099548] ? check_same_owner+0x320/0x320 [ 28.103851] ? rcu_note_context_switch+0x710/0x710 [ 28.108766] ? __might_sleep+0x95/0x190 [ 28.112723] __alloc_pages_nodemask+0x34e/0xd70 [ 28.117375] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 28.122380] ? kimage_free_page_list+0x300/0x300 [ 28.127129] ? kimage_free_page_list+0x209/0x300 [ 28.131879] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 28.137403] ? kimage_is_destination_range+0x140/0x140 [ 28.142662] ? alloc_pages_current+0x114/0x210 [ 28.147228] ? arch_kexec_post_alloc_pages+0x9/0x10 [ 28.152228] ? kimage_alloc_pages+0xf7/0x120 [ 28.156623] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 28.162147] alloc_pages_current+0x10c/0x210 [ 28.166551] ? arch_kexec_pre_free_pages+0xdf0/0xdf0 [ 28.171646] __get_free_pages+0xf/0x40 [ 28.175532] get_zeroed_page+0x11/0x20 [ 28.179402] machine_kexec_prepare+0x971/0xed0 [ 28.183966] ? alloc_pgt_page+0x50/0x50 [ 28.187924] ? kexec_mark_crashkres+0x1a0/0x1a0 [ 28.192577] do_kexec_load+0x3c9/0x790 [ 28.196450] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 28.202235] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.207767] ? ns_capable_common+0x13f/0x170 [ 28.212160] __x64_sys_kexec_load+0x1bf/0x230 [ 28.216643] do_syscall_64+0x1b1/0x800 [ 28.220523] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.225437] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.230360] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.235712] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.240544] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.245713] RIP: 0033:0x455979 [ 28.248884] RSP: 002b:00007ffc994d7358 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 28.256573] RAX: ffffffffffffffda RBX: 0000000002857914 RCX: 0000000000455979 [ 28.263836] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000 [ 28.271087] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 28.278343] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005 [ 28.285603] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 28.292951] page:ffffea0006c37240 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 28.301127] flags: 0x2fffc0000000000() [ 28.305053] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 28.312965] raw: ffffea0006c372a0 ffff8801daf2fdd8 0000000000000000 0000000000000000 [ 28.320868] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [ 28.327945] ------------[ cut here ]------------ [ 28.332694] kernel BUG at include/linux/mm.h:492! [ 28.337565] invalid opcode: 0000 [#1] SMP KASAN [ 28.342227] Dumping ftrace buffer: [ 28.345748] (ftrace buffer empty) [ 28.349435] Modules linked in: [ 28.352813] CPU: 1 PID: 4498 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #44 [ 28.359975] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.369315] RIP: 0010:__free_pages+0x14f/0x180 [ 28.373870] RSP: 0018:ffff8801aca97c08 EFLAGS: 00010203 [ 28.379211] RAX: 0000000000000000 RBX: 1ffff10035952f82 RCX: 0000000000000000 [ 28.386459] RDX: 0000000000000000 RSI: ffffffff81a5b8b5 RDI: ffffed0035952f70 [ 28.393708] RBP: ffff8801aca97c98 R08: ffff8801ae242200 R09: ffffed003b5e4fb0 [ 28.400956] R10: ffffed003b5e4fb0 R11: ffff8801daf27d87 R12: ffffea0006c37240 [ 28.408202] R13: 1ffff10035952f86 R14: ffff8801aca97c70 R15: ffffea0006c3725c [ 28.415454] FS: 0000000002857940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 28.423671] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.429529] CR2: 00000000004daa24 CR3: 00000001ad124000 CR4: 00000000001406e0 [ 28.436781] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.444032] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.451284] Call Trace: [ 28.453853] ? free_unref_page+0x9d0/0x9d0 [ 28.458071] ? kimage_free_page_list+0x209/0x300 [ 28.462812] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.468338] free_pages+0x50/0x90 [ 28.471772] free_transition_pgtable+0x68/0xf0 [ 28.476335] machine_kexec_cleanup+0x9/0x10 [ 28.480636] kimage_free+0x1f2/0x270 [ 28.484330] do_kexec_load+0x53a/0x790 [ 28.488198] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 28.493978] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.499500] ? ns_capable_common+0x13f/0x170 [ 28.503895] __x64_sys_kexec_load+0x1bf/0x230 [ 28.508371] do_syscall_64+0x1b1/0x800 [ 28.512256] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.517167] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.522079] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.527425] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.532252] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.537420] RIP: 0033:0x455979 [ 28.540589] RSP: 002b:00007ffc994d7358 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 28.548273] RAX: ffffffffffffffda RBX: 0000000002857914 RCX: 0000000000455979 [ 28.555520] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000 [ 28.562780] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 28.570031] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005 [ 28.577280] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 28.584526] 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 [ 28.603691] RIP: __free_pages+0x14f/0x180 RSP: ffff8801aca97c08 [ 28.609771] ---[ end trace 7000647dc910ed83 ]--- [ 28.614546] Kernel panic - not syncing: Fatal exception [ 28.620371] Dumping ftrace buffer: [ 28.623891] (ftrace buffer empty) [ 28.627580] Kernel Offset: disabled [ 28.631191] Rebooting in 86400 seconds..