syzbot

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BUG: KCSAN: data-race in __kernel_write_iter / set_task_ioprio

write to 0xffff88810148ba38 of 8 bytes by task 6014 on cpu 0:
 set_task_ioprio+0x240/0x260 block/blk-ioc.c:287
 __do_sys_ioprio_set block/ioprio.c:125 [inline]
 __se_sys_ioprio_set+0x246/0x580 block/ioprio.c:69
 __x64_sys_ioprio_set+0x43/0x50 block/ioprio.c:69
 x64_sys_call+0x2bcf/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:252
 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

read to 0xffff88810148ba38 of 8 bytes by task 6024 on cpu 1:
 __get_task_ioprio include/linux/ioprio.h:59 [inline]
 get_current_ioprio include/linux/ioprio.h:83 [inline]
 init_sync_kiocb include/linux/fs.h:2345 [inline]
 __kernel_write_iter+0xe8/0x4e0 fs/read_write.c:614
 dump_emit_page fs/coredump.c:884 [inline]
 dump_user_range+0x3a7/0x550 fs/coredump.c:945
 elf_core_dump+0x1b66/0x1c60 fs/binfmt_elf.c:2121
 do_coredump+0x1736/0x1ce0 fs/coredump.c:758
 get_signal+0xdc0/0x1070 kernel/signal.c:2902
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 irqentry_exit_to_user_mode+0x9a/0x130 kernel/entry/common.c:231
 irqentry_exit+0x12/0x50 kernel/entry/common.c:334
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x0000000000000000 -> 0xffff88810121e170

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6024 Comm: syz.3.753 Not tainted 6.12.0-rc4-syzkaller-00045-gd12937763990 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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