[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.478827] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.598090] random: sshd: uninitialized urandom read (32 bytes read) [ 23.901288] random: sshd: uninitialized urandom read (32 bytes read) [ 24.695357] random: sshd: uninitialized urandom read (32 bytes read) [ 46.784466] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 52.248645] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/16 14:33:01 parsed 1 programs 2018/05/16 14:33:01 executed programs: 0 [ 52.749519] IPVS: ftp: loaded support on port[0] = 21 [ 52.795498] FAULT_INJECTION: forcing a failure. [ 52.795498] name fail_page_alloc, interval 1, probability 0, space 0, times 1 [ 52.807520] CPU: 0 PID: 4532 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #53 [ 52.814717] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.824050] Call Trace: [ 52.826635] dump_stack+0x1b9/0x294 [ 52.830243] ? dump_stack_print_info.cold.2+0x52/0x52 [ 52.835417] ? __lock_is_held+0xb5/0x140 [ 52.839466] should_fail.cold.4+0xa/0x1a [ 52.843530] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 52.848615] ? __lock_is_held+0xb5/0x140 [ 52.852655] ? graph_lock+0x170/0x170 [ 52.856437] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 52.861440] ? find_held_lock+0x36/0x1c0 [ 52.865496] ? __lock_is_held+0xb5/0x140 [ 52.869545] ? check_same_owner+0x320/0x320 [ 52.873848] ? rcu_note_context_switch+0x710/0x710 [ 52.878766] ? __might_sleep+0x95/0x190 [ 52.882731] __alloc_pages_nodemask+0x34e/0xd70 [ 52.887385] ? __alloc_pages_slowpath+0x2db0/0x2db0 [ 52.892390] ? kimage_free_page_list+0x300/0x300 [ 52.897127] ? kimage_free_page_list+0x209/0x300 [ 52.901867] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 52.907391] ? kimage_is_destination_range+0x140/0x140 [ 52.912656] ? alloc_pages_current+0x114/0x210 [ 52.917224] ? arch_kexec_post_alloc_pages+0x9/0x10 [ 52.922226] ? kimage_alloc_pages+0xf7/0x120 [ 52.926634] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 52.932158] alloc_pages_current+0x10c/0x210 [ 52.936558] ? arch_kexec_pre_free_pages+0xdb0/0xdb0 [ 52.941648] __get_free_pages+0xf/0x40 [ 52.945515] get_zeroed_page+0x11/0x20 [ 52.949385] machine_kexec_prepare+0x971/0xed0 [ 52.953952] ? alloc_pgt_page+0x50/0x50 [ 52.957910] ? kexec_mark_crashkres+0x1a0/0x1a0 [ 52.962578] do_kexec_load+0x3c9/0x790 [ 52.966450] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 52.972331] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.977857] ? ns_capable_common+0x13f/0x170 [ 52.982253] __x64_sys_kexec_load+0x1bf/0x230 [ 52.986740] do_syscall_64+0x1b1/0x800 [ 52.990608] ? syscall_return_slowpath+0x5c0/0x5c0 [ 52.995515] ? syscall_return_slowpath+0x30f/0x5c0 [ 53.000426] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 53.005770] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.010593] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.015766] RIP: 0033:0x455a09 [ 53.018935] RSP: 002b:00007fff2b2615f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 53.026627] RAX: ffffffffffffffda RBX: 0000000002119914 RCX: 0000000000455a09 [ 53.033880] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000 [ 53.041139] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 53.048394] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 [ 53.055817] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 53.063206] page:ffffea0006c8ca00 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 53.071392] flags: 0x2fffc0000000000() [ 53.075318] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 53.083215] raw: ffffea0006c8ca60 ffff8801dae2fdd8 0000000000000000 0000000000000000 [ 53.091120] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [ 53.098197] ------------[ cut here ]------------ [ 53.102939] kernel BUG at include/linux/mm.h:492! [ 53.107814] invalid opcode: 0000 [#1] SMP KASAN [ 53.112469] Dumping ftrace buffer: [ 53.115987] (ftrace buffer empty) [ 53.119682] Modules linked in: [ 53.122859] CPU: 0 PID: 4532 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #53 [ 53.130024] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.139373] RIP: 0010:__free_pages+0x14f/0x180 [ 53.143931] RSP: 0018:ffff8801cf217c08 EFLAGS: 00010203 [ 53.149272] RAX: 0000000000000000 RBX: 1ffff10039e42f82 RCX: 0000000000000000 [ 53.156520] RDX: 0000000000000000 RSI: ffffffff81a5b9e5 RDI: ffffed0039e42f70 [ 53.163785] RBP: ffff8801cf217c98 R08: ffff8801b39bc080 R09: ffffed003b5c4fb0 [ 53.171032] R10: ffffed003b5c4fb0 R11: ffff8801dae27d87 R12: ffffea0006c8ca00 [ 53.178377] R13: 1ffff10039e42f86 R14: ffff8801cf217c70 R15: ffffea0006c8ca1c [ 53.186151] FS: 0000000002119940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 53.194514] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 53.200379] CR2: 00000000004daac4 CR3: 00000001b2201000 CR4: 00000000001406f0 [ 53.207673] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 53.214923] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 53.222169] Call Trace: [ 53.224742] ? free_unref_page+0x9d0/0x9d0 [ 53.229044] ? kimage_free_page_list+0x209/0x300 [ 53.233779] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.239307] free_pages+0x50/0x90 [ 53.242852] free_transition_pgtable+0x68/0xf0 [ 53.247421] machine_kexec_cleanup+0x9/0x10 [ 53.251722] kimage_free+0x1f2/0x270 [ 53.255416] do_kexec_load+0x53a/0x790 [ 53.259284] ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45 [ 53.265064] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.270582] ? ns_capable_common+0x13f/0x170 [ 53.274984] __x64_sys_kexec_load+0x1bf/0x230 [ 53.279473] do_syscall_64+0x1b1/0x800 [ 53.283343] ? syscall_return_slowpath+0x5c0/0x5c0 [ 53.288253] ? syscall_return_slowpath+0x30f/0x5c0 [ 53.293171] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 53.298513] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.303337] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.308505] RIP: 0033:0x455a09 [ 53.311676] RSP: 002b:00007fff2b2615f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 [ 53.319369] RAX: ffffffffffffffda RBX: 0000000002119914 RCX: 0000000000455a09 [ 53.326615] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000 [ 53.333864] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 53.341112] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 [ 53.349026] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005 [ 53.356280] 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 [ 53.375414] RIP: __free_pages+0x14f/0x180 RSP: ffff8801cf217c08 [ 53.381507] ---[ end trace 6b51aa551f1790c9 ]--- [ 53.386349] Kernel panic - not syncing: Fatal exception [ 53.392151] Dumping ftrace buffer: [ 53.395672] (ftrace buffer empty) [ 53.399364] Kernel Offset: disabled [ 53.402972] Rebooting in 86400 seconds..