R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff9177676d4
R13: 00000000004c3315 R14: 00000000004d5218 R15: 0000000000000004
Enabling of bearer <¬»> rejected, illegal name
Enabling of bearer <¬»> rejected, illegal name
==================================================================
BUG: KASAN: stack-out-of-bounds in locks_remove_flock+0x33c/0x350 fs/locks.c:2567
Read of size 8 at addr ffff88018421fa08 by task udevd/7289
Enabling of bearer <¬»> rejected, illegal name

CPU: 1 PID: 7289 Comm: udevd Not tainted 4.20.0-rc1-next-20181107+ #107
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 locks_remove_flock+0x33c/0x350 fs/locks.c:2567
kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle kernel paging request at ffff88017d85fa38
PGD be01067 P4D be01067 PUD 80000001400001e3 
Oops: 0011 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8002 Comm: udevd Not tainted 4.20.0-rc1-next-20181107+ #107
 locks_remove_file+0x148/0x5c0 fs/locks.c:2607
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0xffff88017d85fa38
Code: ff ff 48 36 5d 8a ff ff ff ff 28 fa 85 7d 01 88 ff ff b6 9e 7f 81 ff ff ff ff 90 fb 85 7d 01 88 ff ff 00 09 fe f4 97 3e ad f7 <00> 80 8c bf 01 88 ff ff c0 05 20 bf 01 88 ff ff a8 fa 85 7d 01 88
RSP: 0018:ffff88017d85f878 EFLAGS: 00010293
RAX: ffff8801cd8e6380 RBX: ffff88017d85fa38 RCX: ffffffff81ed5dac
RDX: 0000000000000000 RSI: ffffffff81ed5c9e RDI: ffff88017d85f8f8
RBP: ffff88017d85fa60 R08: ffff8801cd8e6380 R09: ffffed003b5c5b67
R10: ffffed003b5c5b67 R11: ffff8801dae2db3b R12: ffff8801bf2005c0
R13: ffff88017d85f8f8 R14: 1ffff1002fb0bf13 R15: dffffc0000000000
 __fput+0x2f0/0xa70 fs/file_table.c:271
FS:  00007fd923dac7a0(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88017d85fa38 CR3: 00000001b842b000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ____fput+0x15/0x20 fs/file_table.c:312
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 locks_remove_file+0x148/0x5c0 fs/locks.c:2607
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
 __fput+0x2f0/0xa70 fs/file_table.c:271
RIP: 0033:0x7fd9234b42b0
Code: 40 75 0b 31 c0 48 83 c4 08 e9 0c ff ff ff 48 8d 3d c5 32 08 00 e8 c0 07 02 00 83 3d 45 a3 2b 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ce 8a 01 00 48 89 04 24
RSP: 002b:00007fff892cef58 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00000000023ae250 RCX: 00007fd9234b42b0
RDX: 00007fff892d21b0 RSI: 0000000000000002 RDI: 0000000000000007
RBP: 0000000000625500 R08: 00007fff892fd0b0 R09: 00007fff892fd080
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff892cf030
 ____fput+0x15/0x20 fs/file_table.c:312
R13: 0000000000000001 R14: 00007fff892cefc4 R15: 00000000023ae250

 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
The buggy address belongs to the page:
page:ffffea00061087c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 ffffffff06100101 0000000000000000
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293

Memory state around the buggy address:
 ffff88018421f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88018421f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88018421fa00: f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00
                      ^
 ffff88018421fa80: 00 f1 f1 f1 f1 00 00 f2 f2 f2 f2 f2 f2 f8 f2 f2
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
 ffff88018421fb00: f2 f2 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00 00 00
RIP: 0033:0x7fd9234b42b0
==================================================================
Code: 40 75 0b 31 c0 48 83 c4 08 e9 0c ff ff ff 48 8d 3d c5 32 08 00 e8 c0 07 02 00 83 3d 45 a3 2b 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ce 8a 01 00 48 89 04 24