[LU-6679] ASSERTION( !ext->oe_hp ) failed with group lock

Related — Fri, 13 Jan 2017 00:52:18 +0000

We can crash the lustre client using the simple code below:

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>

#include <lustre/lustre_user.h>

int main(int argc, char *argv[])
{
        int fd;
        int rc;
        int gid;
        char *buf;

        fd = open("/mnt/testfile.00000000", O_RDWR);
        gid = atoi(argv[1]);
        rc = ioctl(fd, LL_IOC_GROUP_LOCK, gid);
        if (rc) {
                printf("ioctl %d\n", rc);
                return rc;
        }
        buf = malloc(1<<20);
        memset(buf, 1, 1<<20);
        while (1)
                write(fd, buf, 1<<20);
        return 0;
}

demo purpose only, no error handling.

Run the program with a gid and then run another instance of the program with a different gid, the client will crash right after.

crash> bt
PID: 1989   TASK: ffff88013ca86ae0  CPU: 1   COMMAND: "ldlm_bl_02"
 #0 [ffff88011fe0d8c8] machine_kexec at ffffffff8103b5bb
 #1 [ffff88011fe0d928] crash_kexec at ffffffff810c9852
 #2 [ffff88011fe0d9f8] panic at ffffffff81529343
 #3 [ffff88011fe0da78] lbug_with_loc at ffffffffa0251ecb [libcfs]
 #4 [ffff88011fe0da98] osc_cache_writeback_range at ffffffffa0958e35 [osc]
 #5 [ffff88011fe0dc28] osc_lock_flush at ffffffffa0941495 [osc]
 #6 [ffff88011fe0dca8] osc_ldlm_blocking_ast at ffffffffa0941828 [osc]
 #7 [ffff88011fe0dd18] ldlm_cancel_callback at ffffffffa05404cc [ptlrpc]
 #8 [ffff88011fe0dd38] ldlm_cli_cancel_local at ffffffffa05525da [ptlrpc]
 #9 [ffff88011fe0dd68] ldlm_cli_cancel at ffffffffa0557200 [ptlrpc]
#10 [ffff88011fe0dda8] osc_ldlm_blocking_ast at ffffffffa094165b [osc]
#11 [ffff88011fe0de18] ldlm_handle_bl_callback at ffffffffa055ac40 [ptlrpc]
#12 [ffff88011fe0de48] ldlm_bl_thread_main at ffffffffa055b1a1 [ptlrpc]
#13 [ffff88011fe0dee8] kthread at ffffffff8109e66e
#14 [ffff88011fe0df48] kernel_thread at ffffffff8100c20a

Whamcloud Community JIRA

[LU-6679] ASSERTION( !ext->oe_hp ) failed with group lock