[info] Using makefile-style concurrent boot in runlevel 2.
[   26.962394] audit: type=1800 audit(1543698750.124:21): pid=5872 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2419 res=0
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts.
syzkaller login: [   39.607439] IPVS: ftp: loaded support on port[0] = 21
executing program
[   39.678458] WARNING: CPU: 1 PID: 6028 at fs/userfaultfd.c:1569 userfaultfd_ioctl+0x3d30/0x5610
[   39.687333] Kernel panic - not syncing: panic_on_warn set ...
[   39.693214] CPU: 1 PID: 6028 Comm: syz-executor210 Not tainted 4.20.0-rc4+ #358
[   39.700676] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.710024] Call Trace:
[   39.712606]  dump_stack+0x244/0x39d
[   39.716223]  ? dump_stack_print_info.cold.1+0x20/0x20
[   39.721423]  panic+0x2ad/0x55c
[   39.724614]  ? add_taint.cold.5+0x16/0x16
[   39.728761]  ? __warn.cold.8+0x5/0x45
[   39.732545]  ? __warn+0xe8/0x1d0
[   39.735898]  ? userfaultfd_ioctl+0x3d30/0x5610
[   39.740467]  __warn.cold.8+0x20/0x45
[   39.744164]  ? rcu_softirq_qs+0x20/0x20
[   39.748128]  ? userfaultfd_ioctl+0x3d30/0x5610
[   39.752705]  report_bug+0x254/0x2d0
[   39.756321]  do_error_trap+0x11b/0x200
[   39.760198]  do_invalid_op+0x36/0x40
[   39.763897]  ? userfaultfd_ioctl+0x3d30/0x5610
[   39.768466]  invalid_op+0x14/0x20
[   39.771906] RIP: 0010:userfaultfd_ioctl+0x3d30/0x5610
[   39.777081] Code: 85 c0 f6 ff ff 48 c1 e8 03 42 80 3c 30 00 0f 84 a3 fa ff ff 48 8b bd c0 f6 ff ff e8 4a 60 db ff e9 92 fa ff ff e8 20 07 98 ff <0f> 0b e9 cd f7 ff ff e8 14 07 98 ff 48 8b 95 f0 f6 ff ff b9 01 00
[   39.795974] RSP: 0018:ffff8881b8f37270 EFLAGS: 00010293
[   39.801329] RAX: ffff8881c298a080 RBX: 00000000080000d0 RCX: ffffffff81e77b7b
[   39.808626] RDX: 0000000000000000 RSI: ffffffff81e783b0 RDI: 0000000000000007
[   39.815884] RBP: ffff8881b8f37c00 R08: ffff8881c298a080 R09: 0000000000000008
[   39.823142] R10: 0000000000003cb4 R11: ffff8881c298a080 R12: 0000000020011000
[   39.830401] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8881c2919948
[   39.837682]  ? userfaultfd_ioctl+0x34fb/0x5610
[   39.842253]  ? userfaultfd_ioctl+0x3d30/0x5610
[   39.846830]  ? check_preemption_disabled+0x48/0x280
[   39.851845]  ? userfaultfd_read+0x2c0/0x2c0
[   39.856157]  ? mark_held_locks+0xc7/0x130
[   39.860294]  ? mem_cgroup_commit_charge+0x2c1/0xa50
[   39.865304]  ? mem_cgroup_commit_charge+0x2c1/0xa50
[   39.870312]  ? zap_class+0x640/0x640
[   39.874019]  ? lru_cache_add+0xa50/0xa50
[   39.878068]  ? zap_class+0x640/0x640
[   39.881810]  ? do_huge_pmd_anonymous_page+0x14a3/0x2150
[   39.887161]  ? lock_downgrade+0x900/0x900
[   39.891301]  ? pudp_huge_clear_flush+0x390/0x390
[   39.896059]  ? kasan_check_read+0x11/0x20
[   39.900204]  ? do_raw_spin_unlock+0xa7/0x330
[   39.904600]  ? do_raw_spin_trylock+0x270/0x270
[   39.909192]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   39.914728]  ? clear_subpage+0xdc/0x100
[   39.918706]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
[   39.923729]  ? _raw_spin_unlock+0x2c/0x50
[   39.927869]  ? do_huge_pmd_anonymous_page+0xcbe/0x2150
[   39.933146]  ? __thp_get_unmapped_area+0x180/0x180
[   39.938065]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   39.943590]  ? uprobe_mmap+0x19f/0x1130
[   39.947553]  ? validate_mm+0x386/0x630
[   39.951434]  ? print_usage_bug+0xc0/0xc0
[   39.955485]  ? print_usage_bug+0xc0/0xc0
[   39.959539]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   39.965067]  ? vma_wants_writenotify+0x22c/0x510
[   39.969813]  ? __ia32_sys_mmap_pgoff+0x1a0/0x1a0
[   39.974566]  ? __lock_acquire+0x62f/0x4c20
[   39.978790]  ? __lock_acquire+0x62f/0x4c20
[   39.983016]  ? vma_link+0x116/0x180
[   39.986646]  ? mark_held_locks+0x130/0x130
[   39.990867]  ? mark_held_locks+0x130/0x130
[   39.995090]  ? zap_class+0x640/0x640
[   39.998790]  ? zap_class+0x640/0x640
[   40.002492]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   40.008022]  ? __handle_mm_fault+0xa57/0x5be0
[   40.012511]  ? vmf_insert_mixed_mkwrite+0x40/0x40
[   40.017349]  ? vm_mmap_pgoff+0x222/0x2c0
[   40.021397]  ? lock_downgrade+0x900/0x900
[   40.025541]  ? zap_class+0x640/0x640
[   40.029243]  ? zap_class+0x640/0x640
[   40.032942]  ? zap_class+0x640/0x640
[   40.036666]  ? userfaultfd_unmap_prep+0x660/0x660
[   40.041510]  ? find_held_lock+0x36/0x1c0
[   40.045577]  ? __do_page_fault+0x620/0xe60
[   40.049804]  ? userfaultfd_read+0x2c0/0x2c0
[   40.054116]  do_vfs_ioctl+0x1de/0x1790
[   40.057989]  ? do_vfs_ioctl+0x1de/0x1790
[   40.062040]  ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170
[   40.067305]  ? rcu_softirq_qs+0x20/0x20
[   40.071276]  ? ioctl_preallocate+0x300/0x300
[   40.075673]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   40.081210]  ? __fget_light+0x2e9/0x430
[   40.085179]  ? fget_raw+0x20/0x20
[   40.088628]  ? kasan_check_write+0x14/0x20
[   40.092860]  ? up_read+0x225/0x2c0
[   40.096386]  ? up_read_non_owner+0x100/0x100
[   40.100793]  ? do_syscall_64+0x9a/0x820
[   40.104762]  ? do_syscall_64+0x9a/0x820
[   40.108733]  ? lockdep_hardirqs_on+0x3bb/0x5b0
[   40.113311]  ? security_file_ioctl+0x94/0xc0
[   40.117713]  ksys_ioctl+0xa9/0xd0
[   40.121156]  __x64_sys_ioctl+0x73/0xb0
[   40.125036]  do_syscall_64+0x1b9/0x820
[   40.128910]  ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe
[   40.134262]  ? syscall_return_slowpath+0x5e0/0x5e0
[   40.139177]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   40.144041]  ? trace_hardirqs_on_caller+0x310/0x310
[   40.149050]  ? prepare_exit_to_usermode+0x3b0/0x3b0
[   40.154067]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   40.159595]  ? prepare_exit_to_usermode+0x291/0x3b0
[   40.164603]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   40.169441]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   40.174617] RIP: 0033:0x440ad9
[   40.177809] Code: 23 02 00 85 c0 b8 00 00 00 00 48 0f 44 c3 5b c3 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 0b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[   40.196702] RSP: 002b:00000000007dff68 EFLAGS: 00000217 ORIG_RAX: 0000000000000010
[   40.204402] RAX: ffffffffffffffda RBX: 00007ffe13628d50 RCX: 0000000000440ad9
[   40.211668] RDX: 0000000020d62fe0 RSI: 000000008010aa01 RDI: 0000000000000003
[   40.218924] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   40.226202] R10: 0000000000000004 R11: 0000000000000217 R12: 0000000000402270
[   40.233463] R13: 0000000000402300 R14: 0000000000000000 R15: 0000000000000000
[   40.241825] Kernel Offset: disabled
[   40.245520] Rebooting in 86400 seconds..