[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.274524] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.261201] random: sshd: uninitialized urandom read (32 bytes read) [ 21.508800] random: sshd: uninitialized urandom read (32 bytes read) [ 22.254188] random: sshd: uninitialized urandom read (32 bytes read) [ 22.417218] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.51' (ECDSA) to the list of known hosts. [ 27.819483] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/16 00:57:03 parsed 1 programs 2018/05/16 00:57:03 executed programs: 0 [ 28.331060] IPVS: ftp: loaded support on port[0] = 21 [ 28.381868] FAULT_INJECTION: forcing a failure. [ 28.381868] name fail_page_alloc, interval 1, probability 0, space 0, times 1 [ 28.393991] CPU: 0 PID: 4498 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #52 [ 28.401185] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.410527] Call Trace: [ 28.413118] dump_stack+0x1b9/0x294 [ 28.416732] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.421913] ? __lock_is_held+0xb5/0x140 [ 28.425980] should_fail.cold.4+0xa/0x1a [ 28.430042] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 28.435137] ? __lock_is_held+0xb5/0x140 [ 28.439197] ? graph_lock+0x170/0x170 [ 28.442986] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 28.448001] ? find_held_lock+0x36/0x1c0 [ 28.452058] ? __lock_is_held+0xb5/0x140 [ 28.456124] ? check_same_owner+0x320/0x320 [ 28.460433] ? rcu_note_context_switch+0x710/0x710 [ 28.465444] ? __might_sleep+0x95/0x190 [ 28.469403] __alloc_pages_nodemask+0x34e/0xd70 [ 28.474081] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 28.479104] ? kimage_free_page_list+0x300/0x300 [ 28.483857] ? kimage_free_page_list+0x209/0x300 [ 28.488601] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 28.494139] ? kimage_is_destination_range+0x140/0x140 [ 28.499403] ? alloc_pages_current+0x114/0x210 [ 28.503989] ? arch_kexec_post_alloc_pages+0x9/0x10 [ 28.509002] ? kimage_alloc_pages+0xf7/0x120 [ 28.513427] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 28.518963] alloc_pages_current+0x10c/0x210 [ 28.523366] ? arch_kexec_pre_free_pages+0xdb0/0xdb0 [ 28.528489] __get_free_pages+0xf/0x40 [ 28.532361] get_zeroed_page+0x11/0x20 [ 28.536243] machine_kexec_prepare+0x971/0xed0 [ 28.540823] ? alloc_pgt_page+0x50/0x50 [ 28.544782] ? kexec_mark_crashkres+0x1a0/0x1a0 [ 28.549452] do_kexec_load+0x3c9/0x790 [ 28.553335] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 28.559122] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.564657] ? ns_capable_common+0x13f/0x170 [ 28.569060] __x64_sys_kexec_load+0x1bf/0x230 [ 28.573546] do_syscall_64+0x1b1/0x800 [ 28.577419] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 28.582248] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.587165] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.592099] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.597460] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.602290] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.607469] RIP: 0033:0x455a09 [ 28.610641] RSP: 002b:00007ffc0cc214d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 28.618335] RAX: ffffffffffffffda RBX: 0000000000a7b914 RCX: 0000000000455a09 [ 28.625588] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000 [ 28.632842] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 28.640099] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 28.647366] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 28.654785] page:ffffea000765aa40 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 28.663005] flags: 0x2fffc0000000000() [ 28.666971] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 28.674903] raw: ffffea00076448a0 ffff8801dae2fdd8 0000000000000000 0000000000000000 [ 28.682815] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [ 28.689935] ------------[ cut here ]------------ [ 28.694690] kernel BUG at include/linux/mm.h:492! [ 28.699591] invalid opcode: 0000 [#1] SMP KASAN [ 28.704256] Dumping ftrace buffer: [ 28.707776] (ftrace buffer empty) [ 28.711468] Modules linked in: [ 28.714646] CPU: 0 PID: 4498 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #52 [ 28.721829] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.731203] RIP: 0010:__free_pages+0x14f/0x180 [ 28.735762] RSP: 0018:ffff8801ad6b7c08 EFLAGS: 00010203 [ 28.741114] RAX: 0000000000000000 RBX: 1ffff10035ad6f82 RCX: 0000000000000000 [ 28.748364] RDX: 0000000000000000 RSI: ffffffff81a5b9e5 RDI: ffffed0035ad6f70 [ 28.755621] RBP: ffff8801ad6b7c98 R08: ffff8801d9716400 R09: 0000000000000006 [ 28.762885] R10: ffff8801d9716400 R11: 0000000000000000 R12: ffffea000765aa40 [ 28.770138] R13: 1ffff10035ad6f86 R14: ffff8801ad6b7c70 R15: ffffea000765aa5c [ 28.777392] FS: 0000000000a7b940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 28.785598] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.791462] CR2: 00000000004daac4 CR3: 00000001ad375000 CR4: 00000000001406f0 [ 28.798716] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.805978] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.813233] Call Trace: [ 28.815824] ? free_unref_page+0x9d0/0x9d0 [ 28.820052] ? kimage_free_page_list+0x209/0x300 [ 28.824795] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.830315] free_pages+0x50/0x90 [ 28.833752] free_transition_pgtable+0x68/0xf0 [ 28.838316] machine_kexec_cleanup+0x9/0x10 [ 28.842627] kimage_free+0x1f2/0x270 [ 28.846344] do_kexec_load+0x53a/0x790 [ 28.850225] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 28.856009] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.861534] ? ns_capable_common+0x13f/0x170 [ 28.865932] __x64_sys_kexec_load+0x1bf/0x230 [ 28.870497] do_syscall_64+0x1b1/0x800 [ 28.874367] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 28.879195] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.884115] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.889034] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.894382] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.899207] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.904384] RIP: 0033:0x455a09 [ 28.907552] RSP: 002b:00007ffc0cc214d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 28.915243] RAX: ffffffffffffffda RBX: 0000000000a7b914 RCX: 0000000000455a09 [ 28.922493] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000 [ 28.929752] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 28.937003] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 28.944261] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 28.951511] 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 [ 28.970663] RIP: __free_pages+0x14f/0x180 RSP: ffff8801ad6b7c08 [ 28.976907] ---[ end trace dd7283e052ac08aa ]--- [ 28.981699] Kernel panic - not syncing: Fatal exception [ 28.987592] Dumping ftrace buffer: [ 28.991123] (ftrace buffer empty) [ 28.994812] Kernel Offset: disabled [ 28.998419] Rebooting in 86400 seconds..