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From: bugzilla-daemon@kernel.org
To: linux-ext4@vger.kernel.org
Subject: [Bug 218850] Unexpected failure when write to a file with two file
 descriptor
Date: Mon, 27 May 2024 07:28:38 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=3D218850

--- Comment #2 from Chi (zhangchi_seg@smail.nju.edu.cn) ---
Could you please help me review this report? I am still able to reproduce t=
he
issue with the following test case:

```
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <stddef.h>
#include <unistd.h>
#include <pthread.h>
#include <errno.h>
#include <dirent.h>

#include <string>

#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/xattr.h>
#include <sys/mount.h>
#include <sys/statfs.h>
#include <fcntl.h>

#define ALIGN 4096

void* align_alloc(size_t size) {
    void *ptr =3D NULL;
    int ret =3D posix_memalign(&ptr, ALIGN, size);
    if (ret) {
      printf("align error\n");
      exit(1);
    }
    return ptr;
}

int main()
{
    char *buf_15 =3D (char*)align_alloc(4096*20);
    memset(buf_15, 'a', 4096*20);

    char *buf_4 =3D (char*)align_alloc(4096*20);
    memset(buf_4, 'a', 4096*20);

    mount("/dev/loop0", "/root/mnt", "ext4", 0, "");

    creat("/root/mnt/a", S_IRWXG);
    link("/root/mnt/a", "/root/mnt/b");
    int fd_a =3D open("/root/mnt/a", O_RDWR);
    int fd_b =3D open("/root/mnt/b", O_RDWR | O_DIRECT);

    lseek(fd_a, 100, SEEK_SET);=20
    write(fd_a, buf_15, 9900);=20

    read(fd_b, buf_4, 73728);=20

    int state =3D write(fd_b, buf_15, 65536);=20
    if (state =3D=3D -1) {
        printf("write failure\n");
    }

    return 0;
}
```

--=20
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