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BUG: KCSAN: data-race in relay_switch_subbuf / relay_switch_subbuf

write to 0xffff888115ed0e38 of 8 bytes by interrupt on cpu 1:
 relay_switch_subbuf+0x39e/0x3b0 kernel/relay.c:708
 relay_reserve include/linux/relay.h:248 [inline]
 __blk_add_trace+0x66a/0x730 kernel/trace/blktrace.c:276
 blk_add_trace_rq kernel/trace/blktrace.c:844 [inline]
 blk_add_trace_rq_complete+0x1b7/0x1c0 kernel/trace/blktrace.c:876
 trace_block_rq_complete include/trace/events/block.h:149 [inline]
 blk_update_request+0x8f8/0x950 block/blk-mq.c:894
 scsi_end_request+0x52/0x4f0 drivers/scsi/scsi_lib.c:631
 scsi_io_completion+0x9f/0x200 drivers/scsi/scsi_lib.c:1069
 scsi_finish_command+0x1be/0x1d0 drivers/scsi/scsi.c:198
 scsi_complete+0x19a/0x1d0 drivers/scsi/scsi_lib.c:1531
 blk_complete_reqs block/blk-mq.c:1129 [inline]
 blk_done_softirq+0x74/0xb0 block/blk-mq.c:1134
 __do_softirq+0xc8/0x285 kernel/softirq.c:554
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:633 [inline]
 irq_exit_rcu+0x3c/0x90 kernel/softirq.c:645
 common_interrupt+0x81/0x90 arch/x86/kernel/irq.c:247
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
 check_access kernel/kcsan/core.c:750 [inline]
 __tsan_read4+0xd3/0x180 kernel/kcsan/core.c:1024
 __io_cqring_events io_uring/io_uring.c:185 [inline]
 __io_cqring_overflow_flush+0x25/0x430 io_uring/io_uring.c:690
 io_cqring_do_overflow_flush io_uring/io_uring.c:722 [inline]
 io_cqring_wait io_uring/io_uring.c:2675 [inline]
 __do_sys_io_uring_enter io_uring/io_uring.c:3708 [inline]
 __se_sys_io_uring_enter+0x1434/0x1820 io_uring/io_uring.c:3598
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3598
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

write to 0xffff888115ed0e38 of 8 bytes by task 2741 on cpu 0:
 relay_switch_subbuf+0x39e/0x3b0 kernel/relay.c:708
 relay_reserve include/linux/relay.h:248 [inline]
 __blk_add_trace+0x66a/0x730 kernel/trace/blktrace.c:276
 blk_add_trace_bio kernel/trace/blktrace.c:903 [inline]
 blk_add_trace_bio_queue+0x130/0x140 kernel/trace/blktrace.c:935
 trace_block_bio_queue include/trace/events/block.h:383 [inline]
 submit_bio_noacct_nocheck+0x66b/0x6d0 block/blk-core.c:710
 submit_bio_noacct+0x681/0x830 block/blk-core.c:837
 submit_bio+0x218/0x230 block/blk-core.c:879
 submit_bh_wbc+0x2de/0x320 fs/buffer.c:2804
 submit_bh+0x1e/0x30 fs/buffer.c:2809
 jbd2_journal_commit_transaction+0x15eb/0x33d0 fs/jbd2/commit.c:731
 kjournald2+0x243/0x430 fs/jbd2/journal.c:201
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243

value changed: 0x0000000000000040 -> 0x0000000000000030

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2741 Comm: jbd2/sda1-8 Tainted: G        W          6.9.0-rc2-syzkaller-00193-gc88b9b4cde17 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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