syzbot

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BUG: KCSAN: data-race in hrtimer_reprogram / print_cpu

write to 0xffff888237c1f0e0 of 8 bytes by task 5902 on cpu 0:
 __hrtimer_reprogram kernel/time/hrtimer.c:661 [inline]
 hrtimer_reprogram+0x1a8/0x220 kernel/time/hrtimer.c:868
 hrtimer_start_range_ns+0x508/0x570 kernel/time/hrtimer.c:1303
 hrtimer_start_expires include/linux/hrtimer.h:394 [inline]
 hrtimer_sleeper_start_expires kernel/time/hrtimer.c:1969 [inline]
 do_nanosleep+0x85/0x2f0 kernel/time/hrtimer.c:2045
 hrtimer_nanosleep+0xe7/0x1e0 kernel/time/hrtimer.c:2101
 common_nsleep+0x68/0x80 kernel/time/posix-timers.c:1350
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1396 [inline]
 __se_sys_clock_nanosleep+0x202/0x230 kernel/time/posix-timers.c:1373
 __x64_sys_clock_nanosleep+0x55/0x60 kernel/time/posix-timers.c:1373
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888237c1f0e0 of 8 bytes by task 5960 on cpu 1:
 print_cpu+0x2fb/0x640 kernel/time/timer_list.c:133
 timer_list_show+0x115/0x180 kernel/time/timer_list.c:291
 seq_read_iter+0x612/0x8f0 fs/seq_file.c:272
 proc_reg_read_iter+0x114/0x180 fs/proc/inode.c:299
 call_read_iter include/linux/fs.h:2081 [inline]
 copy_splice_read+0x39f/0x5d0 fs/splice.c:365
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x268/0x660 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000004e512ef872 -> 0x0000004e512cbe0b

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5960 Comm: syz-executor.4 Not tainted 6.8.0-rc7-syzkaller-00260-gfa4b851b4ad6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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