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BUG: KCSAN: data-race in rb_get_reader_page / ring_buffer_unlock_commit

write to 0xffff888100078860 of 8 bytes by task 24816 on cpu 0:
 __rb_get_reader_page kernel/trace/ring_buffer.c:5925 [inline]
 rb_get_reader_page+0xa7d/0xdb0 kernel/trace/ring_buffer.c:5984
 rb_buffer_peek+0x44/0x870 kernel/trace/ring_buffer.c:6065
 ring_buffer_peek+0xb2/0x210 kernel/trace/ring_buffer.c:6268
 peek_next_entry kernel/trace/trace.c:2354 [inline]
 __find_next_entry+0x229/0x420 kernel/trace/trace.c:2398
 trace_find_next_entry_inc kernel/trace/trace.c:2672 [inline]
 tracing_read_pipe+0x2f7/0x790 kernel/trace/trace.c:5440
 vfs_read+0x18e/0x7c0 fs/read_write.c:572
 ksys_read+0xdc/0x1a0 fs/read_write.c:716
 __do_sys_read fs/read_write.c:725 [inline]
 __se_sys_read fs/read_write.c:723 [inline]
 __x64_sys_read+0x40/0x50 fs/read_write.c:723
 x64_sys_call+0x2135/0x2550 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888100078860 of 8 bytes by task 6537 on cpu 1:
 rb_wakeups kernel/trace/ring_buffer.c:4312 [inline]
 ring_buffer_unlock_commit+0x17b/0x450 kernel/trace/ring_buffer.c:4498
 __buffer_unlock_commit kernel/trace/trace.h:1697 [inline]
 trace_buffer_unlock_commit_regs+0x43/0x310 kernel/trace/trace.c:2049
 trace_event_buffer_commit+0x149/0x590 kernel/trace/trace.c:2024
 do_trace_event_raw_event_sys_exit include/trace/events/syscalls.h:44 [inline]
 trace_event_raw_event_sys_exit+0x9f/0xf0 include/trace/events/syscalls.h:44
 __do_trace_sys_exit include/trace/events/syscalls.h:44 [inline]
 trace_sys_exit include/trace/events/syscalls.h:44 [inline]
 trace_syscall_exit+0xba/0x110 kernel/entry/syscall-common.c:18
 syscall_exit_work include/linux/entry-common.h:262 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:297 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:334 [inline]
 do_syscall_64+0x31c/0x360 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff88810019e440 -> 0xffff88812e644e00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6537 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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