syzbot

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BUG: KCSAN: data-race in autofs_wait / autofs_wait

read to 0xffffffff86e01680 of 4 bytes by task 8549 on cpu 1:
 autofs_wait+0x8b1/0xbd0 fs/autofs/waitq.c:386
 autofs_mount_wait+0xc2/0x100 fs/autofs/root.c:256
 autofs_d_automount+0x3fd/0x570 fs/autofs/root.c:410
 follow_automount fs/namei.c:1565 [inline]
 __traverse_mounts+0x256/0x420 fs/namei.c:1618
 traverse_mounts fs/namei.c:1647 [inline]
 handle_mounts fs/namei.c:1749 [inline]
 step_into_slowpath+0x2d5/0x4c0 fs/namei.c:2104
 step_into fs/namei.c:2152 [inline]
 walk_component fs/namei.c:2288 [inline]
 link_path_walk+0x947/0xdd0 fs/namei.c:-1
 path_parentat fs/namei.c:2860 [inline]
 __filename_parentat+0x1ad/0x460 fs/namei.c:2884
 filename_parentat fs/namei.c:2902 [inline]
 filename_create+0x78/0x220 fs/namei.c:4936
 filename_mkdirat+0x81/0x300 fs/namei.c:5302
 __do_sys_mkdirat fs/namei.c:5330 [inline]
 __se_sys_mkdirat+0x32/0xf0 fs/namei.c:5327
 __x64_sys_mkdirat+0x43/0x50 fs/namei.c:5327
 x64_sys_call+0x2c4e/0x3020 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffffffff86e01680 of 4 bytes by task 8546 on cpu 0:
 autofs_wait+0x8dc/0xbd0 fs/autofs/waitq.c:-1
 autofs_mount_wait+0xc2/0x100 fs/autofs/root.c:256
 autofs_d_automount+0x3fd/0x570 fs/autofs/root.c:410
 follow_automount fs/namei.c:1565 [inline]
 __traverse_mounts+0x256/0x420 fs/namei.c:1618
 traverse_mounts fs/namei.c:1647 [inline]
 handle_mounts fs/namei.c:1749 [inline]
 step_into_slowpath+0x2d5/0x4c0 fs/namei.c:2104
 step_into fs/namei.c:2152 [inline]
 walk_component fs/namei.c:2288 [inline]
 link_path_walk+0x947/0xdd0 fs/namei.c:-1
 path_parentat fs/namei.c:2860 [inline]
 __filename_parentat+0x1ad/0x460 fs/namei.c:2884
 filename_parentat fs/namei.c:2902 [inline]
 filename_create+0x78/0x220 fs/namei.c:4936
 filename_mkdirat+0x81/0x300 fs/namei.c:5302
 __do_sys_mkdirat fs/namei.c:5330 [inline]
 __se_sys_mkdirat+0x32/0xf0 fs/namei.c:5327
 __x64_sys_mkdirat+0x43/0x50 fs/namei.c:5327
 x64_sys_call+0x2c4e/0x3020 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00009428 -> 0x00009429

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 8546 Comm: syz.6.1315 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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