syzbot

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BUG: KCSAN: data-race in atime_needs_update / touch_atime

write to 0xffff888106d973b0 of 4 bytes by task 3245 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1570 [inline]
 inode_update_timestamps fs/inode.c:1975 [inline]
 generic_update_time fs/inode.c:1997 [inline]
 inode_update_time fs/inode.c:2017 [inline]
 touch_atime+0x1f3/0x350 fs/inode.c:2089
 pick_link+0x2e1/0x7e0 fs/namei.c:1820
 step_into+0x725/0x810 fs/namei.c:1909
 walk_component fs/namei.c:2045 [inline]
 link_path_walk+0x54c/0x820 fs/namei.c:2404
 path_openat+0x1aa/0x1f10 fs/namei.c:3882
 do_filp_open+0xf7/0x200 fs/namei.c:3913
 do_sys_openat2+0xab/0x120 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1442
 x64_sys_call+0x1025/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888106d973b0 of 4 bytes by task 3253 on cpu 1:
 atime_needs_update+0x261/0x3e0
 touch_atime+0x4a/0x350 fs/inode.c:2072
 pick_link+0x2e1/0x7e0 fs/namei.c:1820
 step_into+0x725/0x810 fs/namei.c:1909
 walk_component fs/namei.c:2045 [inline]
 link_path_walk+0x54c/0x820 fs/namei.c:2404
 path_openat+0x1aa/0x1f10 fs/namei.c:3882
 do_filp_open+0xf7/0x200 fs/namei.c:3913
 do_sys_openat2+0xab/0x120 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1442
 x64_sys_call+0x1025/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x291c86ba -> 0x0e4a11ad

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3253 Comm: udevd Not tainted 6.11.0-rc6-syzkaller-00026-g88fac17500f4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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