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BUG: KCSAN: data-race in ktime_get_ts64 / timekeeping_advance

write to 0xffffffff86fce8c8 of 280 bytes by interrupt on cpu 0:
 timekeeping_advance+0x88e/0xd80 include/linux/string.h:381
 update_wall_time+0x15/0x20 kernel/time/timekeeping.c:2136
 tick_do_update_jiffies64+0x1e5/0x2a0 kernel/time/tick-sched.c:101
 tick_sched_do_timer+0xc7/0xd0 kernel/time/tick-sched.c:147
 tick_sched_timer+0x3f/0xd0 kernel/time/tick-sched.c:1313
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 __read_once_size include/linux/compiler.h:232 [inline]
 check_kcov_mode kernel/kcov.c:155 [inline]
 write_comp_data+0x1e/0x70 kernel/kcov.c:208
 scsi_init_sgtable drivers/scsi/scsi_lib.c:999 [inline]
 scsi_init_io+0x11d/0x380 drivers/scsi/scsi_lib.c:1024
 sd_setup_read_write_cmnd drivers/scsi/sd.c:1174 [inline]
 sd_init_command+0x145/0x1db0 drivers/scsi/sd.c:1290
 scsi_setup_fs_cmnd drivers/scsi/scsi_lib.c:1186 [inline]
 scsi_setup_cmnd drivers/scsi/scsi_lib.c:1204 [inline]
 scsi_mq_prep_fn drivers/scsi/scsi_lib.c:1581 [inline]
 scsi_queue_rq+0xc45/0x17d0 drivers/scsi/scsi_lib.c:1649
 blk_mq_dispatch_rq_list+0x9dc/0xe80 block/blk-mq.c:1263
 blk_mq_do_dispatch_sched+0x12b/0x270 block/blk-mq-sched.c:115
 blk_mq_sched_dispatch_requests+0x2b6/0x380 block/blk-mq-sched.c:211
 __blk_mq_run_hw_queue+0xb1/0x150 block/blk-mq.c:1389
 __blk_mq_delay_run_hw_queue+0x315/0x390 block/blk-mq.c:1466
 blk_mq_run_hw_queue+0xfa/0x1b0 block/blk-mq.c:1519
 blk_mq_sched_insert_requests+0x19c/0x270 block/blk-mq-sched.c:474
 blk_mq_flush_plug_list+0x2f0/0x4c0 block/blk-mq.c:1769
 blk_flush_plug_list+0x281/0x2b0 block/blk-core.c:1760
 blk_finish_plug block/blk-core.c:1777 [inline]
 blk_finish_plug+0x59/0x7a block/blk-core.c:1773
 read_pages+0xbc/0x2d0 mm/readahead.c:142
 __do_page_cache_readahead+0x358/0x380 mm/readahead.c:212
 ra_submit mm/internal.h:62 [inline]
 ondemand_readahead+0x369/0x730 mm/readahead.c:492
 page_cache_sync_readahead+0x1b0/0x1e0 mm/readahead.c:527
 generic_file_buffered_read mm/filemap.c:2036 [inline]
 generic_file_read_iter+0xef7/0x14e0 mm/filemap.c:2309
 ext4_file_read_iter fs/ext4/file.c:131 [inline]
 ext4_file_read_iter+0x103/0x360 fs/ext4/file.c:114
 call_read_iter include/linux/fs.h:1901 [inline]
 generic_file_splice_read+0x2df/0x470 fs/splice.c:313
 do_splice_to+0xc7/0x100 fs/splice.c:892
 splice_direct_to_actor+0x1b9/0x540 fs/splice.c:971
 do_splice_direct+0x152/0x1d0 fs/splice.c:1080
 do_sendfile+0x380/0x800 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1582 [inline]
 __se_sys_sendfile64 fs/read_write.c:1568 [inline]
 __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1568
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff86fce8e0 of 4 bytes by task 29078 on cpu 1:
 timekeeping_delta_to_ns kernel/time/timekeeping.c:363 [inline]
 timekeeping_get_ns kernel/time/timekeeping.c:375 [inline]
 ktime_get_ts64+0x116/0x2c0 kernel/time/timekeeping.c:892
 posix_get_monotonic_timespec+0x45/0x110 kernel/time/posix-timers.c:199
 __do_sys_clock_gettime kernel/time/posix-timers.c:1092 [inline]
 __se_sys_clock_gettime kernel/time/posix-timers.c:1082 [inline]
 __x64_sys_clock_gettime+0xae/0x160 kernel/time/posix-timers.c:1082
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29078 Comm: syz-executor.2 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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