==================================================================
BUG: KCSAN: data-race in handle_mm_fault / watchdog

read to 0xffff88809dc48050 of 8 bytes by task 599 on cpu 0:
 check_hung_uninterruptible_tasks kernel/hung_task.c:197 [inline]
 watchdog+0x2b1/0x960 kernel/hung_task.c:289
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

write to 0xffff88809dc48050 of 8 bytes by task 13113 on cpu 1:
 handle_mm_fault+0x4a/0x530 mm/memory.c:4089
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506
 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13113 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 13113 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0
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+0x11d/0x181 lib/dump_stack.c:118
 panic+0x210/0x640 kernel/panic.c:221
 kcsan_report.cold+0xc/0xd kernel/kcsan/report.c:313
 kcsan_setup_watchpoint+0x3fe/0x460 kernel/kcsan/core.c:416
 check_access kernel/kcsan/core.c:459 [inline]
 __tsan_unaligned_write8+0xc7/0x110 kernel/kcsan/core.c:589
 handle_mm_fault+0x4a/0x530 mm/memory.c:4089
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506
 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203
RIP: 0033:0x401c27
Code: 00 00 00 48 83 ec 08 48 8b 15 6d 0a 67 00 48 8b 05 5e 0a 67 00 48 39 d0 48 8d 8a 00 00 00 01 72 17 48 39 c8 73 12 48 8d 50 04 <89> 38 48 89 15 40 0a 67 00 48 83 c4 08 c3 48 89 c6 bf 70 d2 4c 00
RSP: 002b:00007ffed93130d0 EFLAGS: 00010287
RAX: 0000001b2d23a000 RBX: 0000000089730c44 RCX: 0000001b2e220000
RDX: 0000001b2d23a004 RSI: 0000000000001f66 RDI: ffffffff14d85f63
RBP: 0000000000001af2 R08: 0000000014d85f63 R09: 0000000014d85f67
R10: 00007ffed9313280 R11: 0000000000000246 R12: 000000000075bfa8
R13: 0000000080000000 R14: 00007f6691d33008 R15: 0000000000016b6d
Kernel Offset: disabled
Rebooting in 86400 seconds..