[Crash-utility] Re: [RFC] Patch for fixing 'files' command: TAKE 4
Dave Anderson
anderson at redhat.com
Tue Jan 3 20:04:05 UTC 2006
Rachita Kothiyal wrote:
> On Fri, Dec 23, 2005 at 05:03:30PM -0500, anderson at prospeed.net wrote:
> >
> > Hi Rachita,
> >
> > This looks good -- the only thing I'll change is to print out the
> > offsets unconditionally in dump_offset_table() -- I actually
> > want to see everything in the table, including the -1's for
> > the invalid members.
>
> Hi Dave
>
> I am resending the patch with changes as suggested.
> Please review.
>
> Thanks
> Rachita
>
Strange -- I thought this patch was a no-brainer, but there seems to be
a bizarre problem with this patch, one that I've not gotten a handle on
yet, nor have I ever seen such behaviour before. I'm testing the "files"
command on RHEL3 and RHEL4, and both see the same behaviour.
If I run "foreach files" in the foreground, I get the expected output.
But if I run "foreach files > output", all tasks show "no open files".
So for some reason the change of the output stream is affecting the
operation of the command?
And probably related, check this out, where the first "files 2365"
command takes syslogd's PID and works OK -- but if I set the crash
context to that PID, and then do just a "files" alone I get the
"no open files" response:
crash> files 2365
PID: 2365 TASK: 2184e7b0 CPU: 1 COMMAND: "syslogd"
ROOT: / CWD: /
FD FILE DENTRY INODE TYPE PATH
0 21280880 202a963c 1d086aac SOCK socket:/[5686]
1 20e7a080 1fcd63dc 1a0b5548 REG /var/log/messages
2 20852180 1fcc4df4 1a0b5320 REG /var/log/secure
3 20852980 202a9c2c 1a0b50f8 REG /var/log/maillog
4 20dd7280 202a9cc4 1a768de8 REG /var/log/cron
5 21383280 202a9d5c 1a768bc0 REG /var/log/spooler
6 20852880 202a9f24 1a768998 REG /var/log/boot.log
7 216e6380 202a950c 1a768548 REG /var/log/news/news.crit
8 2109aa80 202a9df4 1a768320 REG /var/log/news/news.err
9 216d7680 202a9214 1a7680f8 REG /var/log/news/news.notice
crash> set 2365
PID: 2365
COMMAND: "syslogd"
TASK: 2184e7b0 [THREAD_INFO: 20cd9000]
CPU: 1
STATE: TASK_INTERRUPTIBLE
crash> files
PID: 2365 TASK: 2184e7b0 CPU: 1 COMMAND: "syslogd"
ROOT: / CWD: /
No open files
crash>
Can you try the same thing on your 2.6.14 kernel?
Thanks,
Dave
>
> o Following changes in the 'files_struct' structure from
> kernels 2.6.14 onwards, this patch attempts to fix the
> broken files command.
>
> Signed-off-by: Rachita Kothiyal <rachita at in.ibm.com>
> ---
>
> defs.h | 6 ++++
> filesys.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++----------------
> symbols.c | 11 ++++++++
> 3 files changed, 78 insertions(+), 21 deletions(-)
>
> diff -puN filesys.c~crash-fix-files-command filesys.c
> --- crash-4.0-2.17/filesys.c~crash-fix-files-command 2005-12-23 18:26:05.000000000 +0530
> +++ crash-4.0-2.17-rachita/filesys.c 2005-12-23 18:26:16.000000000 +0530
> @@ -1710,12 +1710,20 @@ vfs_init(void)
> MEMBER_OFFSET_INIT(fs_struct_pwd, "fs_struct", "pwd");
> MEMBER_OFFSET_INIT(fs_struct_rootmnt, "fs_struct", "rootmnt");
> MEMBER_OFFSET_INIT(fs_struct_pwdmnt, "fs_struct", "pwdmnt");
> - MEMBER_OFFSET_INIT(files_struct_max_fds, "files_struct", "max_fds");
> - MEMBER_OFFSET_INIT(files_struct_max_fdset, "files_struct", "max_fdset");
> - MEMBER_OFFSET_INIT(files_struct_open_fds, "files_struct", "open_fds");
> MEMBER_OFFSET_INIT(files_struct_open_fds_init,
> "files_struct", "open_fds_init");
> - MEMBER_OFFSET_INIT(files_struct_fd, "files_struct", "fd");
> + MEMBER_OFFSET_INIT(files_struct_fdt, "files_struct", "fdt");
> + if ( VALID_MEMBER(files_struct_fdt)) {
> + MEMBER_OFFSET_INIT(fdtable_max_fds, "fdtable", "max_fds");
> + MEMBER_OFFSET_INIT(fdtable_max_fdset, "fdtable", "max_fdset");
> + MEMBER_OFFSET_INIT(fdtable_open_fds, "fdtable", "open_fds");
> + MEMBER_OFFSET_INIT(fdtable_fd, "fdtable", "fd");
> + } else {
> + MEMBER_OFFSET_INIT(files_struct_max_fds, "files_struct", "max_fds");
> + MEMBER_OFFSET_INIT(files_struct_max_fdset, "files_struct", "max_fdset");
> + MEMBER_OFFSET_INIT(files_struct_open_fds, "files_struct", "open_fds");
> + MEMBER_OFFSET_INIT(files_struct_fd, "files_struct", "fd");
> + }
> MEMBER_OFFSET_INIT(file_f_dentry, "file", "f_dentry");
> MEMBER_OFFSET_INIT(file_f_vfsmnt, "file", "f_vfsmnt");
> MEMBER_OFFSET_INIT(file_f_count, "file", "f_count");
> @@ -1766,6 +1774,8 @@ vfs_init(void)
> STRUCT_SIZE_INIT(umode_t, "umode_t");
> STRUCT_SIZE_INIT(dentry, "dentry");
> STRUCT_SIZE_INIT(files_struct, "files_struct");
> + if (VALID_MEMBER(files_struct_fdt))
> + STRUCT_SIZE_INIT(fdtable, "fdtable");
> STRUCT_SIZE_INIT(file, "file");
> STRUCT_SIZE_INIT(inode, "inode");
> STRUCT_SIZE_INIT(vfsmount, "vfsmount");
> @@ -2002,8 +2012,8 @@ void
> open_files_dump(ulong task, int flags, struct reference *ref)
> {
> struct task_context *tc;
> - ulong files_struct_addr;
> - char *files_struct_buf;
> + ulong files_struct_addr, fdtable_addr;
> + char *files_struct_buf, *fdtable_buf = NULL;
> ulong fs_struct_addr;
> char *dentry_buf, *fs_struct_buf;
> ulong root_dentry, pwd_dentry;
> @@ -2031,6 +2041,8 @@ open_files_dump(ulong task, int flags, s
> BZERO(root_pathname, BUFSIZE);
> BZERO(pwd_pathname, BUFSIZE);
> files_struct_buf = GETBUF(SIZE(files_struct));
> + if (VALID_SIZE(fdtable))
> + fdtable_buf = GETBUF(SIZE(fdtable));
> fill_task_struct(task);
>
> sprintf(files_header, " FD%s%s%s%s%s%s%sTYPE%sPATH\n",
> @@ -2111,24 +2123,41 @@ open_files_dump(ulong task, int flags, s
>
> files_struct_addr = ULONG(tt->task_struct + OFFSET(task_struct_files));
>
> - if (files_struct_addr) {
> - readmem(files_struct_addr, KVADDR, files_struct_buf,
> - SIZE(files_struct), "files_struct buffer",
> - FAULT_ON_ERROR);
> -
> - max_fdset = INT(files_struct_buf +
> + if (files_struct_addr) {
> + readmem(files_struct_addr, KVADDR, files_struct_buf,
> + SIZE(files_struct), "files_struct buffer",
> + FAULT_ON_ERROR);
> +
> + if (VALID_MEMBER(files_struct_max_fdset)) {
> + max_fdset = INT(files_struct_buf +
> OFFSET(files_struct_max_fdset));
>
> - max_fds = INT(files_struct_buf +
> - OFFSET(files_struct_max_fds));
> - }
> + max_fds = INT(files_struct_buf +
> + OFFSET(files_struct_max_fds));
> + }
> + }
> +
> + if (VALID_MEMBER(files_struct_fdt)) {
> + fdtable_addr = ULONG(files_struct_buf + OFFSET(files_struct_fdt));
>
> - if (!files_struct_addr || max_fdset == 0 || max_fds == 0) {
> + if (fdtable_addr) {
> + readmem(fdtable_addr, KVADDR, fdtable_buf, SIZE(fdtable), "fdtable buffer", FAULT_ON_ERROR);
> +
> + max_fdset = INT(fdtable_buf +
> + OFFSET(fdtable_max_fdset));
> + max_fds = INT(fdtable_buf +
> + OFFSET(fdtable_max_fds));
> + }
> + }
> +
> + if (!fdtable_addr || !files_struct_addr || max_fdset == 0 || max_fds == 0) {
> if (ref) {
> if (ref->cmdflags & FILES_REF_FOUND)
> fprintf(fp, "\n");
> } else
> fprintf(fp, "No open files\n");
> + if (fdtable_buf)
> + FREEBUF(fdtable_buf);
> FREEBUF(files_struct_buf);
> return;
> }
> @@ -2150,8 +2179,12 @@ open_files_dump(ulong task, int flags, s
> }
> }
>
> - open_fds_addr = ULONG(files_struct_buf +
> - OFFSET(files_struct_open_fds));
> + if (VALID_MEMBER(fdtable_open_fds))
> + open_fds_addr = ULONG(fdtable_buf +
> + OFFSET(fdtable_open_fds));
> + else
> + open_fds_addr = ULONG(files_struct_buf +
> + OFFSET(files_struct_open_fds));
>
> if (open_fds_addr) {
> if (VALID_MEMBER(files_struct_open_fds_init) &&
> @@ -2161,16 +2194,21 @@ open_files_dump(ulong task, int flags, s
> OFFSET(files_struct_open_fds_init),
> &open_fds, sizeof(fd_set));
> else
> - readmem(open_fds_addr, KVADDR, &open_fds,
> - sizeof(fd_set), "files_struct open_fds",
> + readmem(open_fds_addr, KVADDR, &open_fds,
> + sizeof(fd_set), "fdtable open_fds",
> FAULT_ON_ERROR);
> }
>
> - fd = ULONG(files_struct_buf + OFFSET(files_struct_fd));
> + if (VALID_MEMBER(fdtable_fd))
> + fd = ULONG(fdtable_buf + OFFSET(fdtable_fd));
> + else
> + fd = ULONG(files_struct_buf + OFFSET(files_struct_fd));
>
> if (!open_fds_addr || !fd) {
> if (ref && (ref->cmdflags & FILES_REF_FOUND))
> fprintf(fp, "\n");
> + if (fdtable_buf)
> + FREEBUF(fdtable_buf);
> FREEBUF(files_struct_buf);
> return;
> }
> @@ -2224,6 +2262,8 @@ open_files_dump(ulong task, int flags, s
> if (ref && (ref->cmdflags & FILES_REF_FOUND))
> fprintf(fp, "\n");
>
> + if (fdtable_buf)
> + FREEBUF(fdtable_buf);
> FREEBUF(files_struct_buf);
> }
>
> diff -puN defs.h~crash-fix-files-command defs.h
> --- crash-4.0-2.17/defs.h~crash-fix-files-command 2005-12-23 18:26:24.000000000 +0530
> +++ crash-4.0-2.17-rachita/defs.h 2005-12-23 18:26:33.000000000 +0530
> @@ -980,6 +980,11 @@ struct offset_table {
> long hw_interrupt_type_set_affinity;
> long irq_cpustat_t___softirq_active;
> long irq_cpustat_t___softirq_mask;
> + long fdtable_max_fds;
> + long fdtable_max_fdset;
> + long fdtable_open_fds;
> + long fdtable_fd;
> + long files_struct_fdt;
> long files_struct_max_fds;
> long files_struct_max_fdset;
> long files_struct_open_fds;
> @@ -1253,6 +1258,7 @@ struct size_table { /* stash of
> long umode_t;
> long dentry;
> long files_struct;
> + long fdtable;
> long fs_struct;
> long file;
> long inode;
> diff -puN symbols.c~crash-fix-files-command symbols.c
> --- crash-4.0-2.17/symbols.c~crash-fix-files-command 2005-12-23 18:27:16.000000000 +0530
> +++ crash-4.0-2.17-rachita/symbols.c 2006-01-03 12:07:09.579170576 +0530
> @@ -5976,6 +5976,16 @@ dump_offset_table(char *spec, ulong make
> fprintf(fp, " irq_cpustat_t___softirq_mask: %ld\n",
> OFFSET(irq_cpustat_t___softirq_mask));
>
> + fprintf(fp, " files_struct_fdt: %ld\n",
> + OFFSET(files_struct_fdt));
> + fprintf(fp, " fdtable_max_fds: %ld\n",
> + OFFSET(fdtable_max_fds));
> + fprintf(fp, " fdtable_max_fdset: %ld\n",
> + OFFSET(fdtable_max_fdset));
> + fprintf(fp, " fdtable_open_fds: %ld\n",
> + OFFSET(fdtable_open_fds));
> + fprintf(fp, " fdtable_fd: %ld\n",
> + OFFSET(fdtable_fd));
> fprintf(fp, " files_struct_max_fds: %ld\n",
> OFFSET(files_struct_max_fds));
> fprintf(fp, " files_struct_max_fdset: %ld\n",
> @@ -6525,6 +6535,7 @@ dump_offset_table(char *spec, ulong make
> fprintf(fp, " fs_struct: %ld\n", SIZE(fs_struct));
> fprintf(fp, " files_struct: %ld\n",
> SIZE(files_struct));
> + fprintf(fp, " fdtable: %ld\n", SIZE(fdtable));
> fprintf(fp, " file: %ld\n", SIZE(file));
> fprintf(fp, " inode: %ld\n", SIZE(inode));
> fprintf(fp, " vfsmount: %ld\n", SIZE(vfsmount));
> _
>
> --
> Crash-utility mailing list
> Crash-utility at redhat.com
> https://www.redhat.com/mailman/listinfo/crash-utility
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