syzbot

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BUG: KCSAN: data-race in hrtimer_reprogram / print_cpu

write to 0xffff88812c11fce0 of 8 bytes by task 7738 on cpu 1:
 hrtimer_reprogram+0x240/0x2b0 kernel/time/hrtimer.c:836
 hrtimer_start_range_ns+0x4bc/0x680 kernel/time/hrtimer.c:1134
 hrtimer_start_expires include/linux/hrtimer.h:435 [inline]
 hrtimer_sleeper_start_expires kernel/time/hrtimer.c:1795 [inline]
 do_nanosleep+0xfa/0x320 kernel/time/hrtimer.c:1871
 hrtimer_nanosleep+0x136/0x230 kernel/time/hrtimer.c:1927
 __do_sys_nanosleep kernel/time/hrtimer.c:1961 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1948 [inline]
 __x64_sys_nanosleep+0x14b/0x190 kernel/time/hrtimer.c:1948
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812c11fce0 of 8 bytes by task 12031 on cpu 0:
 print_cpu+0x22c/0x670 kernel/time/timer_list.c:148
 timer_list_show+0xb5/0x140 kernel/time/timer_list.c:311
 seq_read+0x346/0x9d0 fs/seq_file.c:229
 proc_reg_read+0xe8/0x140 fs/proc/inode.c:223
 do_loop_readv_writev fs/read_write.c:714 [inline]
 do_loop_readv_writev fs/read_write.c:701 [inline]
 do_iter_read+0x33d/0x3a0 fs/read_write.c:935
 vfs_readv+0x9c/0xf0 fs/read_write.c:1053
 kernel_readv fs/splice.c:365 [inline]
 default_file_splice_read+0x361/0x590 fs/splice.c:422
 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+0x396/0x810 fs/read_write.c:1520
 __do_sys_sendfile64 fs/read_write.c:1581 [inline]
 __se_sys_sendfile64 fs/read_write.c:1567 [inline]
 __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1567
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12031 Comm: syz-executor.4 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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