==================================================================
BUG: KCSAN: data-race in do_nanosleep / mm_update_next_owner

read to 0xffff8881228fd024 of 4 bytes by task 7632 on cpu 0:
 mm_update_next_owner+0x29f/0x460 kernel/exit.c:451
 exit_mm kernel/exit.c:546 [inline]
 do_exit+0x4e5/0x18e0 kernel/exit.c:866
 do_group_exit+0xb4/0x1c0 kernel/exit.c:983
 get_signal+0x2a2/0x1320 kernel/signal.c:2734
 do_signal+0x3b/0xc00 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x250/0x2c0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x2d7/0x2f0 arch/x86/entry/common.c:299
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8881228fd024 of 4 bytes by task 7376 on cpu 1:
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 freezable_schedule include/linux/freezer.h:171 [inline]
 do_nanosleep+0x100/0x330 kernel/time/hrtimer.c:1679
 hrtimer_nanosleep+0x1c1/0x3e0 kernel/time/hrtimer.c:1733
 __do_sys_nanosleep kernel/time/hrtimer.c:1767 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1754 [inline]
 __x64_sys_nanosleep+0x106/0x150 kernel/time/hrtimer.c:1754
 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7376 Comm: syz-executor.1 Not tainted 5.3.0+ #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: 7376 Comm: syz-executor.1 Not tainted 5.3.0+ #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+0x209/0x639 kernel/panic.c:219
 end_report kernel/kcsan/report.c:135 [inline]
 kcsan_report.cold+0x57/0xeb kernel/kcsan/report.c:283
 __kcsan_setup_watchpoint+0x342/0x500 kernel/kcsan/core.c:456
 __tsan_write4 kernel/kcsan/kcsan.c:30 [inline]
 __tsan_write4+0x32/0x40 kernel/kcsan/kcsan.c:30
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 freezable_schedule include/linux/freezer.h:171 [inline]
 do_nanosleep+0x100/0x330 kernel/time/hrtimer.c:1679
 hrtimer_nanosleep+0x1c1/0x3e0 kernel/time/hrtimer.c:1733
 __do_sys_nanosleep kernel/time/hrtimer.c:1767 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1754 [inline]
 __x64_sys_nanosleep+0x106/0x150 kernel/time/hrtimer.c:1754
 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x457f00
Code: c0 5b 5d c3 66 0f 1f 44 00 00 8b 04 24 48 83 c4 18 5b 5d c3 66 0f 1f 44 00 00 83 3d 51 e8 61 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 24 d3 fb ff c3 48 83 ec 08 e8 ea 46 00 00
RSP: 002b:00007ffd93644bc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 000000000000f709 RCX: 0000000000457f00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffd93644bd0
RBP: 0000000000000016 R08: 0000000000000001 R09: 00005555571d9940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006
R13: 00007ffd93644c20 R14: 000000000000f622 R15: 00007ffd93644c30
Kernel Offset: disabled
Rebooting in 86400 seconds..