syzbot

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BUG: KCSAN: data-race in __get_task_ioprio / set_task_ioprio

write to 0xffff88810c453958 of 8 bytes by task 7120 on cpu 1:
 set_task_ioprio+0x23b/0x260 block/blk-ioc.c:287
 __do_sys_ioprio_set block/ioprio.c:125 [inline]
 __se_sys_ioprio_set+0x245/0x570 block/ioprio.c:69
 __x64_sys_ioprio_set+0x43/0x50 block/ioprio.c:69
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88810c453958 of 8 bytes by task 7114 on cpu 0:
 __get_task_ioprio+0x1c/0x120 block/ioprio.c:151
 get_current_ioprio include/linux/ioprio.h:60 [inline]
 init_sync_kiocb include/linux/fs.h:2182 [inline]
 do_iter_readv_writev fs/read_write.c:726 [inline]
 do_iter_write+0x197/0x770 fs/read_write.c:860
 vfs_iter_write+0x56/0x70 fs/read_write.c:901
 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736
 do_splice_from fs/splice.c:933 [inline]
 direct_splice_actor+0x8a/0xb0 fs/splice.c:1142
 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3c4/0x980 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000000000 -> 0xffff888100cb5ee0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7114 Comm: syz-executor.0 Not tainted 6.7.0-rc7-syzkaller-00029-g8735c7c84d1b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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