KCSAN: data-race in d_make_discardable / step_into_slowpath

Status: moderation: reported C repro on 2025/12/08 04:14
Subsystems: fs
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+a179b542833272197887@syzkaller.appspotmail.com
First crash: 329d, last: 1d09h
▶ ▼ ✨ AI Jobs (5)
ID Workflow Result Correct Bug Created Started Finished Revision
78b4feb9 repro-c Reproduced: ✅ ❓ KCSAN: data-race in d_make_discardable / step_into_slowpath 2026/10/02 20:16 2026/10/02 20:16 2026/10/02 20:47 57bbd979
9687229e assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ✅ VMHostTrigger: ❌ ❓ KCSAN: data-race in d_make_discardable / step_into_slowpath 2026/05/16 03:53 2026/05/16 03:53 2026/05/16 04:36 efdaf0f9
fbbeda90 repro ❓ KCSAN: data-race in d_make_discardable / step_into_slowpath 2026/03/07 20:39 2026/03/07 20:39 2026/03/07 20:40 31e9c887
a6bd0643 assessment-kcsan Benign: ✅ Confident: ✅ ❓ KCSAN: data-race in d_make_discardable / step_into_slowpath 2026/02/24 20:31 2026/02/24 20:31 2026/02/24 20:35 305c0ec5
b8fa3440 assessment-kcsan 💥 KCSAN: data-race in d_make_discardable / step_into_slowpath 2026/01/10 02:53 2026/01/10 02:53 2026/01/10 02:53 75199160
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/10/02 22:48 9m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5e0f8396d4805a3e7f753fa58c8c55f1f3cc2160 report job log log

Sample crash report:
==================================================================
BUG: KCSAN: data-race in d_make_discardable / step_into_slowpath

write to 0xffff8881076b23c0 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881076b23c0 of 4 bytes by task 3651 on cpu 0:
 __d_entry_type include/linux/dcache.h:446 [inline]
 d_is_symlink include/linux/dcache.h:476 [inline]
 step_into_slowpath+0x133/0x600 fs/namei.c:2135
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / step_into_slowpath

write to 0xffff8881076b99c0 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881076b99c0 of 4 bytes by task 3651 on cpu 0:
 d_managed include/linux/dcache.h:433 [inline]
 handle_mounts fs/namei.c:1738 [inline]
 step_into_slowpath+0xea/0x600 fs/namei.c:2131
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / lookup_fast

write to 0xffff888107753e40 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107753e40 of 4 bytes by task 3651 on cpu 0:
 d_revalidate fs/namei.c:1034 [inline]
 lookup_fast+0xf1/0x320 fs/namei.c:1868
 walk_component fs/namei.c:2307 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x120/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / path_lookupat

write to 0xffff8881076c1a80 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881076c1a80 of 4 bytes by task 3651 on cpu 0:
 d_managed include/linux/dcache.h:433 [inline]
 step_into fs/namei.c:2169 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x19b/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in dentry_unlink_inode / step_into_slowpath

write to 0xffff888107753b70 of 8 bytes by task 3650 on cpu 1:
 __d_clear_type_and_inode fs/dcache.c:420 [inline]
 dentry_unlink_inode+0x65/0x260 fs/dcache.c:464
 d_delete+0x164/0x180 fs/dcache.c:2706
 d_delete_notify+0x32/0x100 include/linux/fsnotify.h:379
 vfs_unlink+0x287/0x490 fs/namei.c:5693
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107753b70 of 8 bytes by task 3651 on cpu 0:
 step_into_slowpath+0x127/0x600 fs/namei.c:2134
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff88810bffb170 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / do_readlinkat

write to 0xffff888107730c00 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107730c00 of 4 bytes by task 3651 on cpu 0:
 __d_entry_type include/linux/dcache.h:446 [inline]
 d_is_symlink include/linux/dcache.h:476 [inline]
 do_readlinkat+0xa0/0x2f0 fs/stat.c:578
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00300180

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in dont_mount / path_lookupat

read-write to 0xffff8881077446c0 of 4 bytes by task 3650 on cpu 1:
 dont_mount+0x2a/0x40 include/linux/dcache.h:412
 vfs_unlink+0x202/0x490 fs/namei.c:5680
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881077446c0 of 4 bytes by task 3651 on cpu 0:
 d_managed include/linux/dcache.h:433 [inline]
 step_into fs/namei.c:2169 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x19b/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / step_into_slowpath

write to 0xffff88810775d240 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810775d240 of 4 bytes by task 3651 on cpu 0:
 __d_entry_type include/linux/dcache.h:446 [inline]
 d_is_symlink include/linux/dcache.h:476 [inline]
 step_into_slowpath+0x133/0x600 fs/namei.c:2135
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / step_into_slowpath

write to 0xffff8881076bd000 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881076bd000 of 4 bytes by task 3651 on cpu 0:
 d_managed include/linux/dcache.h:433 [inline]
 handle_mounts fs/namei.c:1738 [inline]
 step_into_slowpath+0xea/0x600 fs/namei.c:2131
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / lookup_fast

write to 0xffff8881076aae40 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881076aae40 of 4 bytes by task 3651 on cpu 0:
 d_revalidate fs/namei.c:1034 [inline]
 lookup_fast+0xf1/0x320 fs/namei.c:1868
 walk_component fs/namei.c:2307 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x120/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / path_lookupat

write to 0xffff888107742300 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107742300 of 4 bytes by task 3651 on cpu 0:
 d_managed include/linux/dcache.h:433 [inline]
 step_into fs/namei.c:2169 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x19b/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in dentry_unlink_inode / step_into_slowpath

write to 0xffff888107743270 of 8 bytes by task 3650 on cpu 1:
 __d_clear_type_and_inode fs/dcache.c:420 [inline]
 dentry_unlink_inode+0x65/0x260 fs/dcache.c:464
 d_delete+0x164/0x180 fs/dcache.c:2706
 d_delete_notify+0x32/0x100 include/linux/fsnotify.h:379
 vfs_unlink+0x287/0x490 fs/namei.c:5693
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107743270 of 8 bytes by task 3651 on cpu 0:
 step_into_slowpath+0x127/0x600 fs/namei.c:2134
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff88810ae42690 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / do_readlinkat

write to 0xffff888107746480 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107746480 of 4 bytes by task 3651 on cpu 0:
 __d_entry_type include/linux/dcache.h:446 [inline]
 d_is_symlink include/linux/dcache.h:476 [inline]
 do_readlinkat+0xa0/0x2f0 fs/stat.c:578
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00300180

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / step_into_slowpath

write to 0xffff888107767240 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107767240 of 4 bytes by task 3651 on cpu 0:
 d_managed include/linux/dcache.h:433 [inline]
 handle_mounts fs/namei.c:1738 [inline]
 step_into_slowpath+0xea/0x600 fs/namei.c:2131
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / step_into_slowpath

write to 0xffff888107759000 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107759000 of 4 bytes by task 3651 on cpu 0:
 __d_entry_type include/linux/dcache.h:446 [inline]
 d_is_symlink include/linux/dcache.h:476 [inline]
 step_into_slowpath+0x133/0x600 fs/namei.c:2135
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / lookup_fast

write to 0xffff88810775da80 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810775da80 of 4 bytes by task 3651 on cpu 0:
 d_revalidate fs/namei.c:1034 [inline]
 lookup_fast+0xf1/0x320 fs/namei.c:1868
 walk_component fs/namei.c:2307 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x120/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in dentry_unlink_inode / step_into_slowpath

write to 0xffff888107744f30 of 8 bytes by task 3650 on cpu 1:
 __d_clear_type_and_inode fs/dcache.c:420 [inline]
 dentry_unlink_inode+0x65/0x260 fs/dcache.c:464
 d_delete+0x164/0x180 fs/dcache.c:2706
 d_delete_notify+0x32/0x100 include/linux/fsnotify.h:379
 vfs_unlink+0x287/0x490 fs/namei.c:5693
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107744f30 of 8 bytes by task 3651 on cpu 0:
 step_into_slowpath+0x127/0x600 fs/namei.c:2134
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888103fca948 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / path_lookupat

write to 0xffff8881076c1240 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881076c1240 of 4 bytes by task 3651 on cpu 0:
 d_managed include/linux/dcache.h:433 [inline]
 step_into fs/namei.c:2169 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x19b/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / do_readlinkat

write to 0xffff888107768cc0 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107768cc0 of 4 bytes by task 3651 on cpu 0:
 __d_entry_type include/linux/dcache.h:446 [inline]
 d_is_symlink include/linux/dcache.h:476 [inline]
 do_readlinkat+0xa0/0x2f0 fs/stat.c:578
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00300180

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in dont_mount / step_into_slowpath

read-write to 0xffff8881076ae540 of 4 bytes by task 3650 on cpu 1:
 dont_mount+0x2a/0x40 include/linux/dcache.h:412
 vfs_unlink+0x202/0x490 fs/namei.c:5680
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881076ae540 of 4 bytes by task 3651 on cpu 0:
 __d_entry_type include/linux/dcache.h:446 [inline]
 d_is_symlink include/linux/dcache.h:476 [inline]
 step_into_slowpath+0x133/0x600 fs/namei.c:2135
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_make_discardable / step_into_slowpath

write to 0xffff888107745e40 of 4 bytes by task 3650 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3954
 vfs_unlink+0x1c3/0x490 fs/namei.c:5678
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107745e40 of 4 bytes by task 3651 on cpu 0:
 d_managed include/linux/dcache.h:433 [inline]
 handle_mounts fs/namei.c:1738 [inline]
 step_into_slowpath+0xea/0x600 fs/namei.c:2131
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in d_delete / step_into_slowpath

read-write to 0xffff888107762c00 of 4 bytes by task 3650 on cpu 1:
 d_delete+0x15a/0x180 fs/dcache.c:2705
 d_delete_notify+0x32/0x100 include/linux/fsnotify.h:379
 vfs_unlink+0x287/0x490 fs/namei.c:5693
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5748
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x80/0x140 fs/namei.c:5769
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5769
 x64_sys_call+0x21a3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107762c00 of 4 bytes by task 3651 on cpu 0:
 d_managed include/linux/dcache.h:433 [inline]
 handle_mounts fs/namei.c:1738 [inline]
 step_into_slowpath+0xea/0x600 fs/namei.c:2131
 step_into fs/namei.c:2181 [inline]
 walk_component fs/namei.c:2317 [inline]
 lookup_last fs/namei.c:2818 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2842
 filename_lookup+0x18f/0x390 fs/namei.c:2871
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlinkat fs/stat.c:599 [inline]
 __se_sys_readlinkat fs/stat.c:596 [inline]
 __x64_sys_readlinkat+0x51/0x60 fs/stat.c:596
 x64_sys_call+0x10d5/0x2550 arch/x86/include/generated/asm/syscalls_64.h:268
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00300180 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor137 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================

Crashes (325):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/15 22:45 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9aa622dbaab8 4f92358f .config console log report C ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/02 22:58 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5e0f8396d480 57bbd979 .config console log report C ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/31 23:11 upstream e9954f3fbddd 2041d3f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/30 18:43 upstream bd5c762ac051 0ec395f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/30 16:45 upstream d89e1d186ec9 0ec395f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/30 08:47 upstream d89e1d186ec9 b498adee .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/28 10:30 upstream 65ba8f34ec88 858db2ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/28 08:40 upstream 65ba8f34ec88 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/27 04:36 upstream d135ab453a74 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/25 17:36 upstream 21a7f44fd076 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/25 01:47 upstream 6fba331225f5 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/23 00:37 upstream a1c2b1da93f5 b55fad29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/22 00:24 upstream a804c5742bff 4ba27f85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/21 02:51 upstream 4cbdd58dfa7a df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/19 17:17 upstream c03c1a14507d 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/18 06:48 upstream 32c52ec87d62 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/17 21:16 upstream 58161ead29e5 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/17 03:21 upstream 70dd4ee72eb2 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/16 11:13 upstream 2f2f7eeef8b0 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/14 03:39 upstream ca3e345926b0 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/12 05:21 upstream 24a19b953e2a 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/11 16:22 upstream b88c841d1164 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/11 02:27 upstream a5ebb76233b7 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/10 14:28 upstream 3857c2fe5449 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/10 02:52 upstream fc1c25014ff8 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/09 09:25 upstream af32da41b032 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/07 10:16 upstream 602042bf29f6 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/07 06:52 upstream 602042bf29f6 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/05 15:19 upstream 67f0943b394d af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/04 11:03 upstream 6addb4f38557 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/04 00:01 upstream a74306e2e676 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/10/02 17:45 upstream 5e0f8396d480 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/30 19:06 upstream 551c722f4080 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/29 18:21 upstream 6f8319e3e9a4 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/29 15:13 upstream 6f8319e3e9a4 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/25 19:25 upstream aa98230e410f f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/25 03:27 upstream f49a343b305c f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/24 18:31 upstream f49a343b305c 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/23 13:41 upstream fe2ec83746e5 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/22 18:08 upstream c4e9f74da438 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/22 07:16 upstream f0100363d8c3 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/21 18:54 upstream f0100363d8c3 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/21 06:33 upstream 93f51579e7df 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/20 00:35 upstream 518e5b794c06 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/19 14:30 upstream 40288c9206c1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/18 08:40 upstream 5dd1818b15d9 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/17 20:36 upstream 4982d3552a3b 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/09/17 01:18 upstream 238650ef6c7c 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/05/15 08:27 upstream 70eda68668d1 9cd3beaa .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/03/06 19:31 upstream 651690480a96 41d8037d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/02/24 10:35 upstream 7dff99b35460 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2026/01/09 06:02 upstream 623fb9912f6a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
2025/12/08 04:13 upstream ba65a4e7120a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_make_discardable / step_into_slowpath
* Struck through repros no longer work on HEAD.