[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.476483] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.473229] random: sshd: uninitialized urandom read (32 bytes read) [ 23.953436] random: sshd: uninitialized urandom read (32 bytes read) [ 24.675629] random: sshd: uninitialized urandom read (32 bytes read) [ 24.830068] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. [ 30.352715] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/08 17:43:54 parsed 1 programs 2018/05/08 17:43:54 executed programs: 0 [ 30.824993] IPVS: ftp: loaded support on port[0] = 21 [ 30.881686] FAULT_INJECTION: forcing a failure. [ 30.881686] name fail_page_alloc, interval 1, probability 0, space 0, times 1 [ 30.893607] CPU: 1 PID: 4500 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #39 [ 30.900786] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.910117] Call Trace: [ 30.912694] dump_stack+0x1b9/0x294 [ 30.916307] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.921992] ? __lock_is_held+0xb5/0x140 [ 30.926050] should_fail.cold.4+0xa/0x1a [ 30.930096] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 30.935179] ? __lock_is_held+0xb5/0x140 [ 30.939223] ? graph_lock+0x170/0x170 [ 30.943009] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 30.948026] ? find_held_lock+0x36/0x1c0 [ 30.952072] ? __lock_is_held+0xb5/0x140 [ 30.956123] ? check_same_owner+0x320/0x320 [ 30.960428] ? rcu_note_context_switch+0x710/0x710 [ 30.965341] ? __might_sleep+0x95/0x190 [ 30.969307] __alloc_pages_nodemask+0x34e/0xd70 [ 30.973965] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 30.978963] ? kimage_free_page_list+0x300/0x300 [ 30.983698] ? kimage_free_page_list+0x209/0x300 [ 30.988442] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 30.993959] ? kimage_is_destination_range+0x140/0x140 [ 30.999217] ? alloc_pages_current+0x114/0x210 [ 31.003784] ? arch_kexec_post_alloc_pages+0x9/0x10 [ 31.008787] ? kimage_alloc_pages+0xf7/0x120 [ 31.013182] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 31.018700] alloc_pages_current+0x10c/0x210 [ 31.023091] ? arch_kexec_pre_free_pages+0xdf0/0xdf0 [ 31.028178] __get_free_pages+0xf/0x40 [ 31.032056] get_zeroed_page+0x11/0x20 [ 31.035924] machine_kexec_prepare+0x971/0xed0 [ 31.040489] ? alloc_pgt_page+0x50/0x50 [ 31.044445] ? kexec_mark_crashkres+0x1a0/0x1a0 [ 31.049100] do_kexec_load+0x3c9/0x790 [ 31.052971] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 31.058763] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.064283] ? ns_capable_common+0x13f/0x170 [ 31.068693] __x64_sys_kexec_load+0x1bf/0x230 [ 31.073175] do_syscall_64+0x1b1/0x800 [ 31.077045] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.081870] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.086780] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.091694] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.097049] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.101875] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.107047] RIP: 0033:0x455979 [ 31.110217] RSP: 002b:00007fff43ac1838 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 31.117905] RAX: ffffffffffffffda RBX: 0000000001755914 RCX: 0000000000455979 [ 31.125154] RDX: 00000000200016c0 RSI: 0000000000000001 RDI: 0000000000000000 [ 31.132402] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 31.139649] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 31.146901] R13: 0000000000000403 R14: 00000000006fa0e8 R15: 0000000000000005 [ 31.154300] page:ffffea0007631080 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 31.162484] flags: 0x2fffc0000000000() [ 31.166406] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 31.174322] raw: ffffea00076310e0 ffff8801daf2fdd8 0000000000000000 0000000000000000 [ 31.182220] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [ 31.189307] ------------[ cut here ]------------ [ 31.194045] kernel BUG at include/linux/mm.h:492! [ 31.198921] invalid opcode: 0000 [#1] SMP KASAN [ 31.203579] Dumping ftrace buffer: [ 31.207092] (ftrace buffer empty) [ 31.210779] Modules linked in: [ 31.213953] CPU: 1 PID: 4500 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #39 [ 31.221113] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.230452] RIP: 0010:__free_pages+0x14f/0x180 [ 31.235011] RSP: 0018:ffff8801ac267c08 EFLAGS: 00010203 [ 31.240362] RAX: 0000000000000000 RBX: 1ffff1003584cf82 RCX: 0000000000000000 [ 31.247609] RDX: 0000000000000000 RSI: ffffffff81a5b965 RDI: ffffed003584cf70 [ 31.254853] RBP: ffff8801ac267c98 R08: ffff8801acd6c2c0 R09: ffffed003b5e4fb0 [ 31.262100] R10: ffffed003b5e4fb0 R11: ffff8801daf27d87 R12: ffffea0007631080 [ 31.269347] R13: 1ffff1003584cf86 R14: ffff8801ac267c70 R15: ffffea000763109c [ 31.276595] FS: 0000000001755940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 31.284794] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.290656] CR2: 00000000004d9fe4 CR3: 00000001acbd7000 CR4: 00000000001406e0 [ 31.297904] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.305154] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.312397] Call Trace: [ 31.314963] ? free_unref_page+0x9d0/0x9d0 [ 31.319178] ? kimage_free_page_list+0x209/0x300 [ 31.323917] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.329433] free_pages+0x50/0x90 [ 31.332866] free_transition_pgtable+0x68/0xf0 [ 31.337427] machine_kexec_cleanup+0x9/0x10 [ 31.341728] kimage_free+0x1f2/0x270 [ 31.345427] do_kexec_load+0x53a/0x790 [ 31.349297] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 31.355074] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.360588] ? ns_capable_common+0x13f/0x170 [ 31.364974] __x64_sys_kexec_load+0x1bf/0x230 [ 31.369450] do_syscall_64+0x1b1/0x800 [ 31.373313] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.378133] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.383041] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.387966] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.393318] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.398148] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.403312] RIP: 0033:0x455979 [ 31.406478] RSP: 002b:00007fff43ac1838 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 31.414163] RAX: ffffffffffffffda RBX: 0000000001755914 RCX: 0000000000455979 [ 31.421418] RDX: 00000000200016c0 RSI: 0000000000000001 RDI: 0000000000000000 [ 31.428664] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 31.435912] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 31.443159] R13: 0000000000000403 R14: 00000000006fa0e8 R15: 0000000000000005 [ 31.450420] 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 [ 31.469594] RIP: __free_pages+0x14f/0x180 RSP: ffff8801ac267c08 [ 31.475680] ---[ end trace a03c1ad60bd27923 ]--- [ 31.480461] Kernel panic - not syncing: Fatal exception [ 31.486279] Dumping ftrace buffer: [ 31.489795] (ftrace buffer empty) [ 31.493482] Kernel Offset: disabled [ 31.497084] Rebooting in 86400 seconds..