HI,
When trying to run ssh-keygen or sshd from Cygwin bashboth of them are hanging.
Wehave the following configuration :
- CygWin – latest version
- Openssh – latest available version
- OS – W10 running in a VMWare environment
When attaching with gdb to the process, I can see thatssh-keygen threads are
waiting for something ( see below ) and the program isblocked in
pthread_setspecific ().
Do you have any idea what is causing such a behaviorand how can we:
- Work around it
- Understand what causes it ?
Thank you,
Cezar Damian
(gdb) info threads
Id TargetId Frame
1 Thread 14616.0x2ccc0x00007ffa62e30154 in ntdll!ZwWaitForSingleObject ()
from/cygdrive/c/Windows/SYSTEM32/ntdll.dll
2 Thread 14616.0x3d0c0x00007ffa62e339e4 in
ntdll!ZwWaitForWorkViaWorkerFactory ()
from/cygdrive/c/Windows/SYSTEM32/ntdll.dll
3 Thread 14616.0x12c40x00007ffa62e339e4 in
ntdll!ZwWaitForWorkViaWorkerFactory ()
from/cygdrive/c/Windows/SYSTEM32/ntdll.dll
4 Thread 14616.0x32ac0x00007ffa62e339e4 in
ntdll!ZwWaitForWorkViaWorkerFactory ()
from/cygdrive/c/Windows/SYSTEM32/ntdll.dll
* 5 Thread 14616.0x33040x0000000000000000 in ?? ()
6 Thread 14616.0x38a80x00007ffa62e30194 in ntdll!ZwReadFile () from
/cygdrive/c/Windows/SYSTEM32/ntdll.dll
7 Thread 14616.0x8f0 0x00007ffa62e30c24 in ntdll!ZwWaitForMultipleObjects
() from/cygdrive/c/Windows/SYSTEM32/ntdll.dll
8 Thread 14616.0x3d540x00007ffa62e30c24 in ntdll!ZwWaitForMultipleObjects
() from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
9 Thread 14616.0x1ab40x00007ffa62dbec08 in ntdll!LdrShutdownThread ()
from/cygdrive/c/Windows/SYSTEM32/ntdll.dll
(gdb) backtrace full
#0 0x0000000000000000 in ?? ()
No symbol table info available.
#1 0x0000000180163eb0 in pthread_setspecific ()at
/usr/src/debug/cygwin-3.1.4-1/winsup/cygwin/thread.cc:2858
pthread_key::keys = {mx = {lock_counter = 0, win32_obj_id = 0xcc}, head
=0x800064fb0}
pthread_rwlock::rwlocks= {mx = {lock_counter = 0, win32_obj_id = 0xc8},
head = 0x8000659a0}
pthread::threads = {mx = {lock_counter = 0, win32_obj_id = 0xbc}, head
=0x800000010}
pthread_mutex::mutex_initialization_lock = {lock_counter = 0,
win32_obj_id =0x254}
pthread_null::_instance = {<pthread> = {<verifyable_object> = {
_vptr.verifyable_object = 0x1802bdea0 <vtable for
pthread_null+16>, magic= 0}, win32_obj_id = 0x0,
attr = {<verifyable_object> = {_vptr.verifyable_object =0x1802bde60
<vtable for pthread_attr+16>, magic = 3742232648},
joinable = 1, contentionscope = 0, inheritsched = 0, schedparam
={sched_priority = 0}, stackaddr = 0x0, stacksize = 0,
guardsize= 12288, name = 0x0}, function = 0x0, arg = 0x0,
return_ptr = 0x0, valid =false, suspended = false,
canceled = false, cancelstate = 0, canceltype = 0, cygtls = 0x0,
cancel_event =0x0, joiner = 0x0, next = 0x0,
static threads = {mx = {lock_counter = 0, win32_obj_id =0xbc}, head
= 0x800000010}, thread_id = 0, cleanup_stack = 0x0,
mutex = {<verifyable_object> = {_vptr.verifyable_object =
0x1802bed20<vtable for pthread_mutex+16>, magic = 3742232646},
next = 0x0, lock_counter = 0, win32_obj_id = 0xd8, owner = 0x1,
static_new_mutex = 0x1, static _unlocked_mutex = 0x2,
static _destroyed_mutex = 0x3, recursion_counter = 0, condwaits =
0, type = 2,pshared = 0, static mutexes = {mx = {
lock_counter = 0, win32_obj_id = 0xd0}, head = 0x800065b38},
staticmutex_initialization_lock = {lock_counter = 0,
win32_obj_id = 0x254}}, parent_sigmask = 0}, static _instance
={<pthread> = {<verifyable_object> = {
_vptr.verifyable_object = 0x1802bdea0 <vtable for
pthread_null+16>, magic= 0}, win32_obj_id = 0x0,
attr = {<verifyable_object> = {_vptr.verifyable_object =
0x1802bde60<vtable for pthread_attr+16>, magic = 3742232648},
joinable= 1, contentionscope = 0, inheritsched = 0, schedparam =
{sched_priority = 0},stackaddr = 0x0,
stacksize = 0, guardsize = 12288, name = 0x0}, function = 0x0,
arg = 0x0,return_ptr = 0x0, valid = false,
suspended = false, canceled = false, cancelstate = 0, canceltype =
0, cygtls =0x0, cancel_event = 0x0, joiner = 0x0,
next = 0x0, static threads = {mx = {lock_counter = 0, win32_obj_id
= 0xbc},head = 0x800000010}, thread_id = 0,
cleanup_stack = 0x0, mutex = {<verifyable_object> = {
_vptr.verifyable_object = 0x1802bed20 <vtable for
pthread_mutex+16>,magic = 3742232646}, next = 0x0,
lock_counter = 0, win32_obj_id = 0xd8, owner = 0x1, static
_new_mutex = 0x1,static _unlocked_mutex = 0x2,
static _destroyed_mutex = 0x3, recursion_counter = 0, condwaits
= 0, type = 2,pshared = 0, static mutexes = {mx = {
lock_counter = 0, win32_obj_id = 0xd0}, head = 0x800065b38},
staticmutex_initialization_lock = {
lock_counter = 0, win32_obj_id = 0x254}}, parent_sigmask = 0},
static _instance = <same as static member of an already seen type>}}
pthread_rwlock::rwlock_initialization_lock = {lock_counter = 0,
win32_obj_id =0x108}
semaphore::semaphores = {mx = {lock_counter = 0, win32_obj_id = 0xd4},
head =0x0}
pthread_cond::conds = {mx = {lock_counter = 0, win32_obj_id = 0xc4},
head =0x800065ad0}
pthread_cond::cond_initialization_lock = {lock_counter = 0, win32_obj_id
=0x104}
--Type <RET> for more, q to quit, c to continuewithout paging--
pthread_mutex::mutexes = {mx = {lock_counter = 0, win32_obj_id = 0xd0},
head =0x800065b38}
Backtrace stopped: Cannot access memory at address 0x0
(gdb)
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