KCSAN: data-race in d_delete / do

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in d_delete / do_coredump fs	6				1	551d	549d	0/29	auto-obsoleted due to no activity on 2024/02/11 07:52

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BUG: KCSAN: data-race in d_delete / do_coredump

write to 0xffff888106be3790 of 8 bytes by task 16799 on cpu 1:
 __d_drop fs/dcache.c:575 [inline]
 d_delete+0xff/0x180 fs/dcache.c:2461
 d_delete_notify+0x32/0x100 include/linux/fsnotify.h:400
 vfs_unlink+0x30b/0x420 fs/namei.c:4610
 do_unlinkat+0x28e/0x4c0 fs/namei.c:4659
 do_coredump+0x12f0/0x27b0 fs/coredump.c:724
 get_signal+0xd85/0xf70 kernel/signal.c:3019
 arch_do_signal_or_restart+0x96/0x480 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:330 [inline]
 irqentry_exit_to_user_mode+0x5e/0xa0 kernel/entry/common.c:184
 irqentry_exit+0x12/0x50 kernel/entry/common.c:287
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

read to 0xffff888106be3790 of 8 bytes by task 16798 on cpu 0:
 hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
 d_unhashed include/linux/dcache.h:359 [inline]
 do_coredump+0x144a/0x27b0 fs/coredump.c:762
 get_signal+0xd85/0xf70 kernel/signal.c:3019
 arch_do_signal_or_restart+0x96/0x480 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:330 [inline]
 irqentry_exit_to_user_mode+0x5e/0xa0 kernel/entry/common.c:184
 irqentry_exit+0x12/0x50 kernel/entry/common.c:287
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0xffff88823741c188 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 16798 Comm: syz.9.3814 Tainted: G        W           6.16.0-rc5-syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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