==================================================================
BUG: KCSAN: data-race in __do_munmap / acct_account_cputime

write to 0xffff88815a6300c8 of 8 bytes by task 11800 on cpu 0:
 vm_stat_account mm/mmap.c:3372 [inline]
 remove_vma_list mm/mmap.c:2658 [inline]
 __do_munmap+0xfa4/0x1340 mm/mmap.c:2915
 do_munmap mm/mmap.c:2923 [inline]
 munmap_vma_range mm/mmap.c:604 [inline]
 mmap_region+0x58a/0x13e0 mm/mmap.c:1756
 do_mmap+0x77d/0xc90 mm/mmap.c:1587
 vm_mmap_pgoff+0xfc/0x1d0 mm/util.c:519
 ksys_mmap_pgoff+0x2a8/0x380 mm/mmap.c:1638
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88815a6300c8 of 8 bytes by interrupt on cpu 1:
 __acct_update_integrals kernel/tsacct.c:140 [inline]
 acct_account_cputime+0x15a/0x1a0 kernel/tsacct.c:164
 update_process_times+0x5c/0x150 kernel/time/timer.c:1794
 tick_sched_handle kernel/time/tick-sched.c:226 [inline]
 tick_sched_timer+0x191/0x210 kernel/time/tick-sched.c:1373
 __run_hrtimer+0x160/0x480 kernel/time/hrtimer.c:1537
 __hrtimer_run_queues kernel/time/hrtimer.c:1601 [inline]
 hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x1c0 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x64/0x80 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
 console_unlock+0x8e8/0xb30 kernel/printk/printk.c:2646
 vprintk_emit+0x125/0x3d0 kernel/printk/printk.c:2174
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2185
 vprintk+0x15a/0x170 kernel/printk/printk_safe.c:392
 printk+0x62/0x87 kernel/printk/printk.c:2216
 disk_unlock_native_capacity block/partitions/core.c:531 [inline]
 blk_add_partition block/partitions/core.c:565 [inline]
 blk_add_partitions+0x712/0xa80 block/partitions/core.c:653
 bdev_disk_changed+0x2a1/0x310 fs/block_dev.c:1271
 loop_reread_partitions drivers/block/loop.c:656 [inline]
 loop_set_status+0x75f/0x7e0 drivers/block/loop.c:1419
 lo_ioctl+0x758/0x11f0 drivers/block/loop.c:1487
 blkdev_ioctl+0x1d0/0x3c0 block/ioctl.c:585
 block_ioctl+0x6d/0x80 fs/block_dev.c:1664
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:1055
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:1055
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11508 Comm: syz-executor.2 Not tainted 5.13.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================