syzbot

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BUG: KCSAN: data-race in __kernel_write_iter / set_task_ioprio

write to 0xffff888108929948 of 8 bytes by task 3974 on cpu 0:
 set_task_ioprio+0x240/0x260 block/blk-ioc.c:280
 __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+0x26e4/0x2dc0 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 0xffff888108929948 of 8 bytes by task 3870 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:2418 [inline]
 __kernel_write_iter+0xe8/0x4c0 fs/read_write.c:610
 dump_emit_page fs/coredump.c:885 [inline]
 dump_user_range+0x3ac/0x550 fs/coredump.c:946
 elf_core_dump+0x1d17/0x1ea0 fs/binfmt_elf.c:2129
 do_coredump+0x17fe/0x1f40 fs/coredump.c:759
 get_signal+0xd4f/0x1000 kernel/signal.c:3021
 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:329 [inline]
 irqentry_exit_to_user_mode+0xa7/0x120 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 -> 0xffff888101230c40

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3870 Comm: syz.4.122 Not tainted 6.14.0-rc6-syzkaller-00003-g4d872d51bc9d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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