[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.219141] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.327724] random: sshd: uninitialized urandom read (32 bytes read) [ 21.624611] random: sshd: uninitialized urandom read (32 bytes read) [ 22.383862] random: sshd: uninitialized urandom read (32 bytes read) [ 22.552477] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 27.967457] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/15 12:00:57 parsed 1 programs 2018/05/15 12:00:57 executed programs: 0 [ 28.464841] IPVS: ftp: loaded support on port[0] = 21 [ 28.512961] FAULT_INJECTION: forcing a failure. [ 28.512961] name fail_page_alloc, interval 1, probability 0, space 0, times 1 [ 28.524935] CPU: 1 PID: 4502 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #51 [ 28.532112] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.541442] Call Trace: [ 28.544018] dump_stack+0x1b9/0x294 [ 28.547639] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.552812] ? __lock_is_held+0xb5/0x140 [ 28.556865] should_fail.cold.4+0xa/0x1a [ 28.560905] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 28.565986] ? __lock_is_held+0xb5/0x140 [ 28.570040] ? graph_lock+0x170/0x170 [ 28.573826] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 28.578823] ? find_held_lock+0x36/0x1c0 [ 28.582865] ? __lock_is_held+0xb5/0x140 [ 28.586912] ? check_same_owner+0x320/0x320 [ 28.591218] ? rcu_note_context_switch+0x710/0x710 [ 28.596128] ? __might_sleep+0x95/0x190 [ 28.600089] __alloc_pages_nodemask+0x34e/0xd70 [ 28.604743] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 28.609744] ? kimage_free_page_list+0x300/0x300 [ 28.614482] ? kimage_free_page_list+0x209/0x300 [ 28.619221] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 28.624749] ? kimage_is_destination_range+0x140/0x140 [ 28.630024] ? alloc_pages_current+0x114/0x210 [ 28.634608] ? arch_kexec_post_alloc_pages+0x9/0x10 [ 28.639605] ? kimage_alloc_pages+0xf7/0x120 [ 28.644014] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 28.649550] alloc_pages_current+0x10c/0x210 [ 28.653939] ? arch_kexec_pre_free_pages+0xdb0/0xdb0 [ 28.659036] __get_free_pages+0xf/0x40 [ 28.662912] get_zeroed_page+0x11/0x20 [ 28.666795] machine_kexec_prepare+0x971/0xed0 [ 28.671360] ? alloc_pgt_page+0x50/0x50 [ 28.675314] ? kexec_mark_crashkres+0x1a0/0x1a0 [ 28.679970] do_kexec_load+0x3c9/0x790 [ 28.683839] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 28.689625] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.695143] ? ns_capable_common+0x13f/0x170 [ 28.699537] __x64_sys_kexec_load+0x1bf/0x230 [ 28.704022] do_syscall_64+0x1b1/0x800 [ 28.707902] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.712811] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.717727] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.723076] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.727903] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.733076] RIP: 0033:0x455a09 [ 28.736242] RSP: 002b:00007ffd4e465668 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 28.743933] RAX: ffffffffffffffda RBX: 0000000001458914 RCX: 0000000000455a09 [ 28.751185] RDX: 0000000020000640 RSI: 0000000000000001 RDI: 0000000000000000 [ 28.758435] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 28.765682] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 28.772930] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 28.780370] page:ffffea0006bd6a40 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 28.788553] flags: 0x2fffc0000000000() [ 28.792469] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 28.800366] raw: ffffea0006bd6aa0 ffff8801daf2fdd8 0000000000000000 0000000000000000 [ 28.808263] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [ 28.815347] ------------[ cut here ]------------ [ 28.820091] kernel BUG at include/linux/mm.h:492! [ 28.824963] invalid opcode: 0000 [#1] SMP KASAN [ 28.829625] Dumping ftrace buffer: [ 28.833149] (ftrace buffer empty) [ 28.836835] Modules linked in: [ 28.840011] CPU: 1 PID: 4502 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #51 [ 28.847180] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.856518] RIP: 0010:__free_pages+0x14f/0x180 [ 28.861075] RSP: 0018:ffff8801ace6fc08 EFLAGS: 00010203 [ 28.866420] RAX: 0000000000000000 RBX: 1ffff100359cdf82 RCX: 0000000000000000 [ 28.873689] RDX: 0000000000000000 RSI: ffffffff81a5b9e5 RDI: ffffed00359cdf70 [ 28.880939] RBP: ffff8801ace6fc98 R08: ffff8801accc4080 R09: ffffed003b5e4fb0 [ 28.888188] R10: ffffed003b5e4fb0 R11: ffff8801daf27d87 R12: ffffea0006bd6a40 [ 28.895439] R13: 1ffff100359cdf86 R14: ffff8801ace6fc70 R15: ffffea0006bd6a5c [ 28.902687] FS: 0000000001458940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 28.910890] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.916747] CR2: 00000000004daac4 CR3: 00000001accb2000 CR4: 00000000001406e0 [ 28.923995] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.931248] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.938491] Call Trace: [ 28.941061] ? free_unref_page+0x9d0/0x9d0 [ 28.945284] ? kimage_free_page_list+0x209/0x300 [ 28.950033] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.955553] free_pages+0x50/0x90 [ 28.958986] free_transition_pgtable+0x68/0xf0 [ 28.963562] machine_kexec_cleanup+0x9/0x10 [ 28.967861] kimage_free+0x1f2/0x270 [ 28.971560] do_kexec_load+0x53a/0x790 [ 28.975429] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 28.981205] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.986720] ? ns_capable_common+0x13f/0x170 [ 28.991107] __x64_sys_kexec_load+0x1bf/0x230 [ 28.995581] do_syscall_64+0x1b1/0x800 [ 28.999447] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.004368] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.009281] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.014623] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.019450] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.024621] RIP: 0033:0x455a09 [ 29.027787] RSP: 002b:00007ffd4e465668 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 29.035484] RAX: ffffffffffffffda RBX: 0000000001458914 RCX: 0000000000455a09 [ 29.042730] RDX: 0000000020000640 RSI: 0000000000000001 RDI: 0000000000000000 [ 29.049979] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 29.057236] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 29.064488] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 29.071735] 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 [ 29.090869] RIP: __free_pages+0x14f/0x180 RSP: ffff8801ace6fc08 [ 29.096967] ---[ end trace bfdd41fa37bdf55e ]--- [ 29.101740] Kernel panic - not syncing: Fatal exception [ 29.107585] Dumping ftrace buffer: [ 29.111100] (ftrace buffer empty) [ 29.114784] Kernel Offset: disabled [ 29.118401] Rebooting in 86400 seconds..