==================================================================
BUG: KCSAN: data-race in dio_bio_end_io / dio_new_bio

read-write to 0xffff888116476cd8 of 8 bytes by interrupt on cpu 0:
 dio_bio_end_io+0x53/0xd0 fs/direct-io.c:387
 bio_endio+0x369/0x410 block/bio.c:1548
 blk_update_request+0x368/0x860 block/blk-mq.c:983
 blk_mq_end_request+0x26/0x50 block/blk-mq.c:1145
 lo_complete_rq+0xce/0x180 drivers/block/loop.c:395
 blk_complete_reqs block/blk-mq.c:1220 [inline]
 blk_done_softirq+0x74/0xb0 block/blk-mq.c:1225
 handle_softirqs+0xbf/0x280 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0x3a/0xc0 kernel/softirq.c:662
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x73/0x80 arch/x86/kernel/apic/apic.c:1049
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:94 [inline]
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irq+0x2f/0x50 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 filemap_remove_folio+0x73/0x1f0 mm/filemap.c:256
 truncate_inode_folio+0x42/0x50 mm/truncate.c:162
 shmem_undo_range+0x25b/0xa70 mm/shmem.c:1108
 shmem_truncate_range mm/shmem.c:1224 [inline]
 shmem_evict_inode+0x14d/0x530 mm/shmem.c:1352
 evict+0x2f0/0x570 fs/inode.c:796
 iput_final fs/inode.c:1946 [inline]
 iput+0x42a/0x5b0 fs/inode.c:1972
 dentry_unlink_inode+0x24f/0x260 fs/dcache.c:440
 __dentry_kill+0x18b/0x4c0 fs/dcache.c:643
 dput+0x5c/0xd0 fs/dcache.c:885
 __fput+0x428/0x640 fs/file_table.c:472
 ____fput+0x1c/0x30 fs/file_table.c:492
 task_work_run+0x13a/0x1a0 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xa8/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888116476cd8 of 8 bytes by task 10914 on cpu 1:
 dio_bio_reap fs/direct-io.c:550 [inline]
 dio_new_bio+0x249/0x460 fs/direct-io.c:669
 dio_send_cur_page+0x1f2/0x7a0 fs/direct-io.c:750
 submit_page_section+0x1a3/0x5b0 fs/direct-io.c:815
 do_direct_IO fs/direct-io.c:1030 [inline]
 __blockdev_direct_IO+0x11bb/0x1e80 fs/direct-io.c:1243
 blockdev_direct_IO include/linux/fs.h:3412 [inline]
 fat_direct_IO+0x10a/0x1d0 fs/fat/inode.c:281
 generic_file_read_iter+0x225/0x330 mm/filemap.c:2870
 copy_splice_read+0x383/0x5b0 fs/splice.c:365
 do_splice_read fs/splice.c:984 [inline]
 splice_direct_to_actor+0x28b/0x670 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x398/0x660 fs/read_write.c:1363
 __do_sys_sendfile64 fs/read_write.c:1424 [inline]
 __se_sys_sendfile64 fs/read_write.c:1410 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410
 x64_sys_call+0xfbd/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff8881273b2f00 -> 0xffff8881273b26c0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 10914 Comm: syz.3.2561 Tainted: G        W          6.14.0-rc7-syzkaller-00067-g76b6905c11fd #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================