Hello Ryusuke,
I have attached the output below (let me know if you need anything further -
thanks for your help):
[Thread debugging using libthread_db enabled]
0x0090a402 in __kernel_vsyscall ()
#0 0x0090a402 in __kernel_vsyscall ()
No symbol table info available.
#1 0x00267713 in __waitpid_nocancel () from /lib/libc.so.6
No symbol table info available.
#2 0x0020c07b in do_system () from /lib/libc.so.6
No symbol table info available.
#3 0x08049154 in nilfs_backtrace () at fsck0.nilfs2.c:176
cmd = "backtrace 10688 > /var/log/bt_fsck0.nilfs2.10688.out
2>&1\000\000\000\243\213)\000\032\200*\000\024\215#\000\002", '\000' <repeats
12 times>"\360, l\222\002\000\000\000\364\257\062\000\000\000\000"
progname = "/sbin\000fsck0.nilfs2", '\000' <repeats 18 times>,
"`\000\000\000p\301\062\000\004\000\000\000\346\356#\000\000\000\000\000\230\301\062\000p\000\000\000\377\017\000\000@\000\000\000\300\277\337\bp\301\062\0
00\000 \004\000\032\200*\000\000\020\002\000\001\000\000\000\000\000\000"
n = <value optimized out>
#4 0x08049251 in read_block (fd=3, blocknr=2696911, buf=0x8ddb8b0, size=4096)
at fsck0.nilfs2.c:204
No locals.
#5 0x080492d9 in next_ss_entry (fd=3, blocknrp=0xbfc458b8,
offsetp=0xbfc458c4, entry_size=8) at fsck0.nilfs2.c:570
p = <value optimized out>
#6 0x0804994c in get_latest_cno (fd=3, seginfo=0x8dfd8f8, start=0x8dfe410)
at fsck0.nilfs2.c:636
No locals.
#7 find_latest_cno_in_logical_segment (fd=3, seginfo=0x8dfd8f8,
start=0x8dfe410) at fsck0.nilfs2.c:660
loginfo = 0x8dfe410
cno = 3249616
latest_cno = 0
seq = <value optimized out>
i = 0
#8 0x0804aafc in nilfs_fsck (argc=2146089, argv=0xbfc4579c)
at fsck0.nilfs2.c:1058
No locals.
#9 main (argc=2146089, argv=0xbfc4579c) at fsck0.nilfs2.c:1183
No locals.
Thread 1 (Thread 0xb7fdfa80 (LWP 10688)):
#0 0x0090a402 in __kernel_vsyscall ()
No symbol table info available.
#1 0x00267713 in __waitpid_nocancel () from /lib/libc.so.6
No symbol table info available.
#2 0x0020c07b in do_system () from /lib/libc.so.6
No symbol table info available.
#3 0x08049154 in nilfs_backtrace () at fsck0.nilfs2.c:176
cmd = "backtrace 10688 > /var/log/bt_fsck0.nilfs2.10688.out
2>&1\000\000\000\243\213)\000\032\200*\000\024\215#\000\002", '\000' <repeats
12 times>"\360, l\222\002\000\000\000\364\257\062\000\000\000\000"
progname = "/sbin\000fsck0.nilfs2", '\000' <repeats 18 times>,
"`\000\000\000p\301\062\000\004\000\000\000\346\356#\000\000\000\000\000\230\301\062\000p\000\000\000\377\017\000\000@\000\000\000\300\277\337\bp\301\062\0
00\000 \004\000\032\200*\000\000\020\002\000\001\000\000\000\000\000\000"
n = <value optimized out>
#4 0x08049251 in read_block (fd=3, blocknr=2696911, buf=0x8ddb8b0, size=4096)
at fsck0.nilfs2.c:204
No locals.
#5 0x080492d9 in next_ss_entry (fd=3, blocknrp=0xbfc458b8,
offsetp=0xbfc458c4, entry_size=8) at fsck0.nilfs2.c:570
p = <value optimized out>
#6 0x0804994c in get_latest_cno (fd=3, seginfo=0x8dfd8f8, start=0x8dfe410)
at fsck0.nilfs2.c:636
No locals.
#7 find_latest_cno_in_logical_segment (fd=3, seginfo=0x8dfd8f8,
start=0x8dfe410) at fsck0.nilfs2.c:660
loginfo = 0x8dfe410
cno = 3249616
latest_cno = 0
seq = <value optimized out>
i = 0
#8 0x0804aafc in nilfs_fsck (argc=2146089, argv=0xbfc4579c)
at fsck0.nilfs2.c:1058
No locals.
#9 main (argc=2146089, argv=0xbfc4579c) at fsck0.nilfs2.c:1183
No locals.
Thread 1 (Thread 0xb7fdfa80 (LWP 10688)):
#0 0x0090a402 in __kernel_vsyscall ()
No symbol table info available.
#1 0x00267713 in __waitpid_nocancel () from /lib/libc.so.6
No symbol table info available.
#2 0x0020c07b in do_system () from /lib/libc.so.6
No symbol table info available.
#3 0x08049154 in nilfs_backtrace () at fsck0.nilfs2.c:176
cmd = "backtrace 10688 > /var/log/bt_fsck0.nilfs2.10688.out
2>&1\000\000\000\243\213)\000\032\200*\000\024\215#\000\002", '\000' <repeats
12 times>"\360, l\222\002\000\000\000\364\257\062\000\000\000\000"
progname = "/sbin\000fsck0.nilfs2", '\000' <repeats 18 times>,
"`\000\000\000p\301\062\000\004\000\000\000\346\356#\000\000\000\000\000\230\301\062\000p\000\000\000\377\017\000\000@\000\000\000\300\277\337\bp\301\062\0
00\000 \004\000\032\200*\000\000\020\002\000\001\000\000\000\000\000\000"
n = <value optimized out>
#4 0x08049251 in read_block (fd=3, blocknr=2696911, buf=0x8ddb8b0, size=4096)
at fsck0.nilfs2.c:204
No locals.
#5 0x080492d9 in next_ss_entry (fd=3, blocknrp=0xbfc458b8,
offsetp=0xbfc458c4, entry_size=8) at fsck0.nilfs2.c:570
p = <value optimized out>
#6 0x0804994c in get_latest_cno (fd=3, seginfo=0x8dfd8f8, start=0x8dfe410)
at fsck0.nilfs2.c:636
No locals.
#7 find_latest_cno_in_logical_segment (fd=3, seginfo=0x8dfd8f8,
start=0x8dfe410) at fsck0.nilfs2.c:660
loginfo = 0x8dfe410
cno = 3249616
latest_cno = 0
seq = <value optimized out>
i = 0
#8 0x0804aafc in nilfs_fsck (argc=2146089, argv=0xbfc4579c)
at fsck0.nilfs2.c:1058
No locals.
#9 main (argc=2146089, argv=0xbfc4579c) at fsck0.nilfs2.c:1183
No locals.
A debugging session is active.
Inferior 1 [process 10688] will be detached.
Quit anyway? (y or n) [answered Y; input not from terminal]
Zahid
-----Original Message-----
From: Ryusuke Konishi [mailto:[email protected]]
Sent: Friday, June 17, 2011 11:29 AM
To: Zahid Chowdhury
Cc: [email protected]
Subject: Re: mount & fsck of nilfs partition fail.
On Wed, 15 Jun 2011 11:38:16 -0700, Zahid Chowdhury wrote:
> Hello Ryusuke,
> Yes, "the data on the partition is important". Please let me know how to
> "get a backtrace of the error" and I will send it to you. Thanks a lot.
>
> Zahid
Try the following patch.
You will need to install gdb and backtrace script available at:
http://samba.org/ftp/unpacked/junkcode/segv_handler/backtrace
The modified fsck0.nilfs2 will write a backtrace into
"/var/log/bt_fsck0.nilfs2.<pid>.out".
Regards,
Ryusuke Konishi
---
From: Ryusuke Konishi <[email protected]>
fsck0.nilfs2: add backtrace routine
Signed-off-by: Ryusuke Konishi <[email protected]>
---
sbin/fsck/Makefile.am | 2 +-
sbin/fsck/fsck0.nilfs2.c | 30 +++++++++++++++++++++++++++++-
2 files changed, 30 insertions(+), 2 deletions(-)
diff --git a/sbin/fsck/Makefile.am b/sbin/fsck/Makefile.am
index 789ae1b..5357967 100644
--- a/sbin/fsck/Makefile.am
+++ b/sbin/fsck/Makefile.am
@@ -1,6 +1,6 @@
## Makefile.am
-AM_CFLAGS = -Wall
+AM_CFLAGS = -Wall -g
AM_CPPFLAGS = -I$(top_srcdir)/include
LDADD = -luuid $(top_builddir)/lib/libnilfsfeature.la \
$(top_builddir)/lib/libmountchk.la \
diff --git a/sbin/fsck/fsck0.nilfs2.c b/sbin/fsck/fsck0.nilfs2.c
index 35a010c..6a41766 100644
--- a/sbin/fsck/fsck0.nilfs2.c
+++ b/sbin/fsck/fsck0.nilfs2.c
@@ -151,6 +151,32 @@ static inline void *nilfs_zalloc(size_t size)
}
/*
+ * The following part is based on segv_handler by Andrew Tridgell
+ * found at http://samba.org/ftp/unpacked/junkcode/segv_handler/
+ *
+ * To enable this feature, install gdb and 'backtrace' script available
+ * on the above site.
+ */
+static void nilfs_backtrace(void)
+{
+ char cmd[100];
+ char progname[100];
+ char *p;
+ int n;
+
+ n = readlink("/proc/self/exe", progname, sizeof(progname));
+ progname[n] = 0;
+
+ p = strrchr(progname, '/');
+ *p = 0;
+
+ snprintf(cmd, sizeof(cmd),
+ "backtrace %d > /var/log/bt_%s.%d.out 2>&1",
+ (int)getpid(), p+1, (int)getpid());
+ system(cmd);
+}
+
+/*
* Block buffer
*/
static void *block_buffer = NULL;
@@ -173,9 +199,11 @@ static void read_block(int fd, __u64 blocknr, void *buf,
unsigned long size)
{
if (lseek64(fd, blocknr * blocksize, SEEK_SET) < 0 ||
- read(fd, buf, size) < size)
+ read(fd, buf, size) < size) {
+ nilfs_backtrace();
die("cannot read block (blocknr = %llu): %s",
(unsigned long long)blocknr, strerror(errno));
+ }
}
static inline __u64 segment_start_blocknr(unsigned long segnum)
--
1.7.3.5
--
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