==================================================================
BUG: KCSAN: data-race in dentry_unlink_inode / step_into_slowpath

write to 0xffff888106ece870 of 8 bytes by task 3663 on cpu 0:
 __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_unlink fs/namei.c:5783 [inline]
 __se_sys_unlink+0x2b/0xe0 fs/namei.c:5780
 __x64_sys_unlink+0x1f/0x30 fs/namei.c:5780
 x64_sys_call+0x18ee/0x2550 arch/x86/include/generated/asm/syscalls_64.h:88
 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 0xffff888106ece870 of 8 bytes by task 3666 on cpu 1:
 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_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+0x1d41/0x2550 arch/x86/include/generated/asm/syscalls_64.h:90
 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: 0xffff8881004d1948 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3666 Comm: syz-executor100 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_instantiate / lookup_fast

read-write to 0xffff888106ed06c0 of 4 bytes by task 3663 on cpu 0:
 fsnotify_update_flags include/linux/fsnotify_backend.h:-1 [inline]
 __d_instantiate+0x2a8/0x390 fs/dcache.c:2160
 d_instantiate_new+0x68/0xf0 fs/dcache.c:2206
 ext4_add_nondir+0x187/0x1b0 fs/ext4/namei.c:2796
 ext4_symlink+0x58f/0x660 fs/ext4/namei.c:3435
 vfs_symlink+0xfd/0x220 fs/namei.c:5823
 filename_symlinkat+0xe8/0x2b0 fs/namei.c:5848
 __do_sys_symlink fs/namei.c:5875 [inline]
 __se_sys_symlink+0x42/0x1b0 fs/namei.c:5871
 __x64_sys_symlink+0x31/0x40 fs/namei.c:5871
 x64_sys_call+0x211f/0x2550 arch/x86/include/generated/asm/syscalls_64.h:89
 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 0xffff888106ed06c0 of 4 bytes by task 3666 on cpu 1:
 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_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+0x1d41/0x2550 arch/x86/include/generated/asm/syscalls_64.h:90
 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: 0x00040040 -> 0x00340040

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3666 Comm: syz-executor100 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 0xffff888106ed99c0 of 4 bytes by task 3663 on cpu 0:
 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_unlink fs/namei.c:5783 [inline]
 __se_sys_unlink+0x2b/0xe0 fs/namei.c:5780
 __x64_sys_unlink+0x1f/0x30 fs/namei.c:5780
 x64_sys_call+0x18ee/0x2550 arch/x86/include/generated/asm/syscalls_64.h:88
 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 0xffff888106ed99c0 of 4 bytes by task 3666 on cpu 1:
 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_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+0x1d41/0x2550 arch/x86/include/generated/asm/syscalls_64.h:90
 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: 0x00340040 -> 0x00040040

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3666 Comm: syz-executor100 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_instantiate / path_lookupat

read-write to 0xffff888105940540 of 4 bytes by task 3663 on cpu 0:
 fsnotify_update_flags include/linux/fsnotify_backend.h:-1 [inline]
 __d_instantiate+0x2a8/0x390 fs/dcache.c:2160
 d_instantiate_new+0x68/0xf0 fs/dcache.c:2206
 ext4_add_nondir+0x187/0x1b0 fs/ext4/namei.c:2796
 ext4_symlink+0x58f/0x660 fs/ext4/namei.c:3435
 vfs_symlink+0xfd/0x220 fs/namei.c:5823
 filename_symlinkat+0xe8/0x2b0 fs/namei.c:5848
 __do_sys_symlink fs/namei.c:5875 [inline]
 __se_sys_symlink+0x42/0x1b0 fs/namei.c:5871
 __x64_sys_symlink+0x31/0x40 fs/namei.c:5871
 x64_sys_call+0x211f/0x2550 arch/x86/include/generated/asm/syscalls_64.h:89
 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 0xffff888105940540 of 4 bytes by task 3666 on cpu 1:
 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_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+0x1d41/0x2550 arch/x86/include/generated/asm/syscalls_64.h:90
 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: 0x00040040 -> 0x00340040

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3666 Comm: syz-executor100 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================