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

read to 0xffff8880a77a9090 of 8 bytes by task 1061 on cpu 0:
 check_hung_uninterruptible_tasks kernel/hung_task.c:197 [inline]
 watchdog+0x2c3/0x7c0 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 0xffff8880a77a9090 of 8 bytes by task 7302 on cpu 1:
 handle_mm_fault+0x4a/0x530 mm/memory.c:3987
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
 do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7302 Comm: syz-executor.5 Not tainted 5.4.0-rc3+ #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: 7302 Comm: syz-executor.5 Not tainted 5.4.0-rc3+ #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+0xf5/0x159 lib/dump_stack.c:113
 panic+0x210/0x640 kernel/panic.c:221
 kcsan_report.cold+0xc/0x10 kernel/kcsan/report.c:302
 __kcsan_setup_watchpoint+0x32e/0x4a0 kernel/kcsan/core.c:411
 __tsan_write8 kernel/kcsan/kcsan.c:36 [inline]
 __tsan_write8+0x32/0x40 kernel/kcsan/kcsan.c:36
 handle_mm_fault+0x4a/0x530 mm/memory.c:3987
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
 do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202
RIP: 0033:0x40dee1
Code: 3d b3 a1 34 00 00 0f 85 3b 08 00 00 e8 48 a8 04 00 85 c0 89 c5 0f 88 73 05 00 00 0f 84 f0 04 00 00 89 c6 bf c6 fc 4b 00 31 c0 <e8> 2a 3f ff ff c7 44 24 30 00 00 00 00 e8 ed 46 ff ff 49 89 c6 48
RSP: 002b:00007ffd97330410 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004587ea
RDX: 0000000000000000 RSI: 00000000000001d3 RDI: 00000000004bfcc6
RBP: 00000000000001d3 R08: 0000000000000001 R09: 0000000001554940
R10: 0000000001554c10 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd97330440 R14: 0000000000000000 R15: 00007ffd97330450
Kernel Offset: disabled
Rebooting in 86400 seconds..