[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.094719] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.301937] random: sshd: uninitialized urandom read (32 bytes read)
[   23.706607] random: sshd: uninitialized urandom read (32 bytes read)
[   24.471632] random: sshd: uninitialized urandom read (32 bytes read)
[   42.616180] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts.
[   47.995075] random: sshd: uninitialized urandom read (32 bytes read)
2018/05/15 15:55:21 parsed 1 programs
2018/05/15 15:55:21 executed programs: 0
[   48.466690] IPVS: ftp: loaded support on port[0] = 21
[   48.511214] FAULT_INJECTION: forcing a failure.
[   48.511214] name fail_page_alloc, interval 1, probability 0, space 0, times 1
[   48.523217] CPU: 1 PID: 4543 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #51
[   48.530385] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.539718] Call Trace:
[   48.542324]  dump_stack+0x1b9/0x294
[   48.545938]  ? dump_stack_print_info.cold.2+0x52/0x52
[   48.551111]  ? __lock_is_held+0xb5/0x140
[   48.555156]  should_fail.cold.4+0xa/0x1a
[   48.559198]  ? fault_create_debugfs_attr+0x1f0/0x1f0
[   48.564279]  ? __lock_is_held+0xb5/0x140
[   48.568324]  ? graph_lock+0x170/0x170
[   48.572122]  ? __alloc_pages_slowpath+0x2db0/0x2db0
[   48.577120]  ? find_held_lock+0x36/0x1c0
[   48.581162]  ? __lock_is_held+0xb5/0x140
[   48.585212]  ? check_same_owner+0x320/0x320
[   48.589517]  ? rcu_note_context_switch+0x710/0x710
[   48.594439]  ? __might_sleep+0x95/0x190
[   48.598406]  __alloc_pages_nodemask+0x34e/0xd70
[   48.603056]  ? __alloc_pages_slowpath+0x2db0/0x2db0
[   48.608054]  ? kimage_free_page_list+0x300/0x300
[   48.612791]  ? kimage_free_page_list+0x209/0x300
[   48.617529]  ? __sanitizer_cov_trace_const_cmp2+0x18/0x20
[   48.623047]  ? kimage_is_destination_range+0x140/0x140
[   48.628302]  ? alloc_pages_current+0x114/0x210
[   48.632868]  ? arch_kexec_post_alloc_pages+0x9/0x10
[   48.637862]  ? kimage_alloc_pages+0xf7/0x120
[   48.642256]  ? __sanitizer_cov_trace_const_cmp2+0x18/0x20
[   48.647777]  alloc_pages_current+0x10c/0x210
[   48.652164]  ? arch_kexec_pre_free_pages+0xdb0/0xdb0
[   48.657248]  __get_free_pages+0xf/0x40
[   48.661117]  get_zeroed_page+0x11/0x20
[   48.664983]  machine_kexec_prepare+0x971/0xed0
[   48.669546]  ? alloc_pgt_page+0x50/0x50
[   48.673500]  ? kexec_mark_crashkres+0x1a0/0x1a0
[   48.678151]  do_kexec_load+0x3c9/0x790
[   48.682020]  ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45
[   48.687799]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   48.693316]  ? ns_capable_common+0x13f/0x170
[   48.697706]  __x64_sys_kexec_load+0x1bf/0x230
[   48.702185]  do_syscall_64+0x1b1/0x800
[   48.706053]  ? syscall_return_slowpath+0x5c0/0x5c0
[   48.710963]  ? syscall_return_slowpath+0x30f/0x5c0
[   48.715875]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   48.721234]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   48.726063]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   48.731236] RIP: 0033:0x455a09
[   48.734423] RSP: 002b:00007ffdd18f5438 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6
[   48.742111] RAX: ffffffffffffffda RBX: 00000000022e8914 RCX: 0000000000455a09
[   48.749358] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000
[   48.756617] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
[   48.763874] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
[   48.771121] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005
[   48.778487] page:ffffea0006bab580 count:0 mapcount:0 mapping:0000000000000000 index:0x0
[   48.786673] flags: 0x2fffc0000000000()
[   48.790611] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
[   48.798513] raw: ffffea0006bab5e0 ffff8801daf2fdd8 0000000000000000 0000000000000000
[   48.806425] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)
[   48.813518] ------------[ cut here ]------------
[   48.818257] kernel BUG at include/linux/mm.h:492!
[   48.823143] invalid opcode: 0000 [#1] SMP KASAN
[   48.827792] Dumping ftrace buffer:
[   48.831310]    (ftrace buffer empty)
[   48.834998] Modules linked in:
[   48.838174] CPU: 1 PID: 4543 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #51
[   48.845332] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.854683] RIP: 0010:__free_pages+0x14f/0x180
[   48.859254] RSP: 0018:ffff8801ae80fc08 EFLAGS: 00010203
[   48.864594] RAX: 0000000000000000 RBX: 1ffff10035d01f82 RCX: 0000000000000000
[   48.871850] RDX: 0000000000000000 RSI: ffffffff81a5b9e5 RDI: ffffed0035d01f70
[   48.879099] RBP: ffff8801ae80fc98 R08: ffff8801af0c6480 R09: ffffed003b5e4fb0
[   48.886346] R10: ffffed003b5e4fb0 R11: ffff8801daf27d87 R12: ffffea0006bab580
[   48.893599] R13: 1ffff10035d01f86 R14: ffff8801ae80fc70 R15: ffffea0006bab59c
[   48.900847] FS:  00000000022e8940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
[   48.909046] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   48.914903] CR2: 00000000004daac4 CR3: 00000001d79e6000 CR4: 00000000001406e0
[   48.922151] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   48.929399] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   48.936645] Call Trace:
[   48.939219]  ? free_unref_page+0x9d0/0x9d0
[   48.943434]  ? kimage_free_page_list+0x209/0x300
[   48.948172]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   48.953686]  free_pages+0x50/0x90
[   48.957127]  free_transition_pgtable+0x68/0xf0
[   48.961697]  machine_kexec_cleanup+0x9/0x10
[   48.965995]  kimage_free+0x1f2/0x270
[   48.969687]  do_kexec_load+0x53a/0x790
[   48.973552]  ? kimage_crash_copy_vmcoreinfo.cold.9+0x45/0x45
[   48.979331]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   48.984849]  ? ns_capable_common+0x13f/0x170
[   48.989239]  __x64_sys_kexec_load+0x1bf/0x230
[   48.993711]  do_syscall_64+0x1b1/0x800
[   48.997576]  ? syscall_return_slowpath+0x5c0/0x5c0
[   49.002492]  ? syscall_return_slowpath+0x30f/0x5c0
[   49.007402]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   49.012742]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   49.017564]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   49.023031] RIP: 0033:0x455a09
[   49.026201] RSP: 002b:00007ffdd18f5438 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6
[   49.033886] RAX: ffffffffffffffda RBX: 00000000022e8914 RCX: 0000000000455a09
[   49.041129] RDX: 00000000200005c0 RSI: 0000000000000007 RDI: 0000000000000000
[   49.048372] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
[   49.055630] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
[   49.062875] R13: 0000000000000468 R14: 00000000006faa60 R15: 0000000000000005
[   49.070121] 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 
[   49.089258] RIP: __free_pages+0x14f/0x180 RSP: ffff8801ae80fc08
[   49.095364] ---[ end trace 15ed597d02a45ff1 ]---
[   49.100122] Kernel panic - not syncing: Fatal exception
[   49.105929] Dumping ftrace buffer:
[   49.109446]    (ftrace buffer empty)
[   49.113134] Kernel Offset: disabled
[   49.116739] Rebooting in 86400 seconds..