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upstream test error: KCSAN: data-race in d_delete / lookup_fast

Status: auto-obsoleted due to no activity on 2026/05/23 14:07
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+f1f0c650601426ea4f03@syzkaller.appspotmail.com
First crash: 59d, last: 59d
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
f48fc733-7650-4368-89af-32e8ec5d31a2 assessment-security 💥 upstream test error: KCSAN: data-race in d_delete / lookup_fast 2026/05/14 15:02 2026/05/14 15:02 2026/05/14 15:03 6ccb967e465e832a7bfd7a116ad00d52a0923a5d failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128 From /app/workdir/repo/linux * branch HEAD -> FETCH_HEAD Updating files: 19% (18081/93019) Updating files: 20% (18604/93019) Updating files: 21% (19534/93019) Updating files: 22% (20465/93019) Updating files: 23% (21395/93019) Updating files: 24% (22325/93019) Updating files: 25% (23255/93019) Updating files: 26% (24185/93019) Updating files: 27% (25116/93019) Updating files: 28% (26046/93019) Updating files: 29% (26976/93019) Updating files: 30% (27906/93019) Updating files: 30% (27923/93019) Updating files: 31% (28836/93019) Updating files: 32% (29767/93019) error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/goya_masks.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/goya_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/ic_pll_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mc_pll_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme1_rtr_masks.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme1_rtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme2_rtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme3_rtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme4_rtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme5_rtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme6_rtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme_cmdq_masks.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme_cmdq_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme_masks.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme_qm_masks.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme_qm_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mme_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mmu_masks.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/mmu_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/pci_nrtr_masks.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/pci_nrtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/pcie_aux_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/pcie_wrap_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/psoc_emmc_pll_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/psoc_etr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/psoc_global_conf_masks.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/psoc_global_conf_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/psoc_mme_pll_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/psoc_pci_pll_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/psoc_spi_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/psoc_timestamp_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/sram_y0_x0_rtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/sram_y0_x1_rtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/sram_y0_x2_rtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/sram_y0_x3_rtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg/sram_y0_x4_rtr_regs.h error: unable to write file drivers/accel/habanalabs/include/goya/asic_reg

Sample crash report:
==================================================================
BUG: KCSAN: data-race in d_delete / lookup_fast

read-write to 0xffff888100696000 of 4 bytes by task 3987 on cpu 1:
 d_delete+0xbe/0xe0 fs/dcache.c:2529
 d_delete_notify+0x32/0x100 include/linux/fsnotify.h:375
 vfs_unlink+0x289/0x490 fs/namei.c:5485
 filename_unlinkat+0x1e2/0x410 fs/namei.c:5540
 __do_sys_unlink fs/namei.c:5575 [inline]
 __se_sys_unlink+0x2b/0xe0 fs/namei.c:5572
 __x64_sys_unlink+0x1f/0x30 fs/namei.c:5572
 x64_sys_call+0x2eb6/0x3020 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888100696000 of 4 bytes by task 2998 on cpu 0:
 d_revalidate fs/namei.c:1029 [inline]
 lookup_fast+0xf0/0x320 fs/namei.c:1864
 walk_component fs/namei.c:2275 [inline]
 lookup_last fs/namei.c:2780 [inline]
 path_lookupat+0x15c/0x500 fs/namei.c:2804
 filename_lookup+0x190/0x390 fs/namei.c:2833
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlink fs/stat.c:605 [inline]
 __se_sys_readlink fs/stat.c:602 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:602
 x64_sys_call+0x2b51/0x3020 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00300180 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2998 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/28 14:06 upstream be762d8b6dd7 b5ceaad2 .config console log report [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce upstream test error: KCSAN: data-race in d_delete / lookup_fast
* Struck through repros no longer work on HEAD.