[stgt] segfault when stopping the target
Tomasz Chmielewski
mangoo at wpkg.org
Tue Oct 21 15:50:36 CEST 2008
FUJITA Tomonori schrieb:
> On Tue, 21 Oct 2008 14:15:57 +0200
> Tomasz Chmielewski <mangoo at wpkg.org> wrote:
>
>> FUJITA Tomonori schrieb:
>>
>>>>>> # tgtadm --op delete --mode conn --tid 2 --sid 2 --cid 0
>>>>>> Segmentation fault
>>>>>>
>>>>>> If a segfault does not happen immediately, start all these commands
>>>>>> again (or, generally, "tgtadm --op delete --mode conn --tid 2 --sid 1
>>>>>> --cid 0" is enough).
>>>>>>
>>>>>> For me, on x86, segfault happens in 90% of cases. Sometimes, the
>>>>>> connection is eventually deleted.
>>> I tried the above commands three times on x86 but I can't reproduce
>>> this problem.
>> It is easier when there is some traffic to the target.
>>
>>
>>> Can you use gdb to find where tgtadm crashes?
>> Sure.
>> Here is strace output, but it doesn't say much, does it? I'll try to get more data with gdb.
>>
>> execve("/usr/sbin/tgtadm", ["tgtadm", "--op", "delete", "--mode", "conn", "--tid", "1", "--sid", "1", "--cid", "0"], [/* 20 vars */]) = 0
>> uname({sys="Linux", node="megathecus", ...}) = 0
>> brk(0) = 0x804d000
>> access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
>> mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x6feee000
>> access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
>> open("/etc/ld.so.cache", O_RDONLY) = 3
>> fstat64(3, {st_mode=S_IFREG|0644, st_size=16095, ...}) = 0
>> mmap2(NULL, 16095, PROT_READ, MAP_PRIVATE, 3, 0) = 0x6feea000
>> close(3) = 0
>> access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
>> open("/lib/tls/libc.so.6", O_RDONLY) = 3
>> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240O\1"..., 512) = 512
>> fstat64(3, {st_mode=S_IFREG|0644, st_size=1245488, ...}) = 0
>> mmap2(NULL, 1251484, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x6fdb8000
>> mmap2(0x6fee0000, 28672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x128) = 0x6fee0000
>> mmap2(0x6fee7000, 10396, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x6fee7000
>> close(3) = 0
>> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x6fdb7000
>> mprotect(0x6fee0000, 20480, PROT_READ) = 0
>> set_thread_area({entry_number:-1 -> 6, base_addr:0x6fdb78e0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0,useable:1}) = 0
>> munmap(0x6feea000, 16095) = 0
>> brk(0) = 0x804d000
>> brk(0x8070000) = 0x8070000
>> socket(PF_FILE, SOCK_STREAM, 0) = 3
>> connect(3, {sa_family=AF_FILE, path=@TGT_IPC_ABSTRACT_NAMESPACE}, 110) = 0
>> write(3, "\4\0\0\0\1\0\0\0iscsi\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 116) = 116
>> read(3, "", 8) = 0
>> --- SIGSEGV (Segmentation fault) @ 0 (0) ---
>> +++ killed by SIGSEGV +++
>> Process 5131 detached
>
> This helps?
At least it does not crash any more ;)
But it loops endlessly.
execve("/usr/sbin/tgtadm", ["tgtadm", "--op", "delete", "--mode", "conn", "--tid", "1", "--sid", "1", "--cid", "0"], [/* 20 vars */]) = 0
uname({sys="Linux", node="megathecus", ...}) = 0
brk(0) = 0x804d000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x6ffb7000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=16095, ...}) = 0
mmap2(NULL, 16095, PROT_READ, MAP_PRIVATE, 3, 0) = 0x6ffb3000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/tls/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240O\1"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=1245488, ...}) = 0
mmap2(NULL, 1251484, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x6fe81000
mmap2(0x6ffa9000, 28672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x128) = 0x6ffa9000
mmap2(0x6ffb0000, 10396, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x6ffb0000
close(3) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x6fe80000
mprotect(0x6ffa9000, 20480, PROT_READ) = 0
set_thread_area({entry_number:-1 -> 6, base_addr:0x6fe808e0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0,
useable:1}) = 0
munmap(0x6ffb3000, 16095) = 0
brk(0) = 0x804d000
brk(0x8070000) = 0x8070000
socket(PF_FILE, SOCK_STREAM, 0) = 3
connect(3, {sa_family=AF_FILE, path=@TGT_IPC_ABSTRACT_NAMESPACE}, 110) = 0
write(3, "\4\0\0\0\1\0\0\0iscsi\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 116) = 116
recv(3, "", 8, MSG_WAITALL) = 0
recv(3, "", 8, MSG_WAITALL) = 0
recv(3, "", 8, MSG_WAITALL) = 0
recv(3, "", 8, MSG_WAITALL) = 0
recv(3, "", 8, MSG_WAITALL) = 0
recv(3, "", 8, MSG_WAITALL) = 0
recv(3, "", 8, MSG_WAITALL) = 0
recv(3, "", 8, MSG_WAITALL) = 0
recv(3, "", 8, MSG_WAITALL) = 0
recv(3, "", 8, MSG_WAITALL) = 0
recv(3, "", 8, MSG_WAITALL) = 0
recv(3, "", 8, MSG_WAITALL) = 0
(...)
And it repeats "recv(3, "", 8, MSG_WAITALL) = 0" all the time.
--
Tomasz Chmielewski
http://wpkg.org
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