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Re: logging: TCP connection to x.x.x.x/3128 failed

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Hi Alex,
Alex Rousskov wrote,

> On 4/6/23 06:41, Waldemar Brodkorb wrote:
> 
> > There is still one assertion which happens sometimes:
> > cache.log:2023/04/06 07:24:48 kid1| assertion failed: ../src/base/CbcPointer.h:181: "EX"
> > 
> > Have you ever seen this in the wild? What does it mean?
> 
> This low-level assertion (where "EX" is usually spelled as "c") corresponds
> to many high-level Squid bugs, most of them fixed. Please see
> https://bugs.squid-cache.org/show_bug.cgi?id=5265#c1 for the suggested next
> steps.

We have a core dump now. Ubuntu 22.04 with Squid 5.8.

gdb /usr/sbin/squid core.13.873301.1681462147 
GNU gdb (Ubuntu 12.1-0ubuntu1~22.04) 12.1
Copyright (C) 2022 Free Software Foundation, Inc.                                                                                                                                                                   
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There is NO WARRANTY, to the extent permitted by law.                                                                                                                                                               
Type "show copying" and "show warranty" for details.                                                                                                                                                                
This GDB was configured as "x86_64-linux-gnu".                                                                                                                                                                      
Type "show configuration" for configuration details.                                                                                                                                                                
For bug reporting instructions, please see:                                                                                                                                                                         
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Find the GDB manual and other documentation resources online at:                                                                                                                                                    
    <http://www.gnu.org/software/gdb/documentation/>.                                                                                                                                                               

For help, type "help".                                                                                                                                                  
Type "apropos word" to search for commands related to "word"...                                                                                                                                                     
Reading symbols from /usr/sbin/squid...                                                                                                                                                                             
Reading symbols from /usr/lib/debug/.build-id/4d/655715326bdce358de6a95a564b6e4e                                                                                                                                    ec84d5e.debug...                                                                                                                                                                                                    
[New LWP 873301]                                                                                                                                
[Thread debugging using libthread_db enabled]                                                                                                                                                                       
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".                                                                                                                                          
Core was generated by `(squid-1) --kid squid-1 --foreground -sYC'.                                                                                                                                                  
Program terminated with signal SIGABRT, Aborted.                                                                                                                                                                    
--Type <RET> for more, q to quit, c to continue without paging--                                                                                                                                                    
#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=140419666299392)                                                                                                                                     
    at ./nptl/pthread_kill.c:44                                                                                                                                                                             
44      ./nptl/pthread_kill.c: No such file or directory.                                                                                                                                                           
(gdb) bt full                                                                                                                       
#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=140419666299392)                                                                                                                                     
    at ./nptl/pthread_kill.c:44                                                                                                                                                                             
        tid = <optimized out>                                                                                                                                                                       
        ret = 0                                                                                                                             
        pd = 0x7fb600544a00                                                                                                                                                                 
        old_mask = {__val = {94534848520128, 94535132367528, 94533992246864,                                                                                                                                        
            94532923700193, 94532920519424, 94532966275696, 94533267707520,                                                                                                                                         
            140419709921070, 94534848520128, 0, 140723926211296,                                                                                                                                                    
            94532958412936, 0, 8, 26902275, 140419709808628}}                                                                                                                                                       
        ret = <optimized out>                                                                                                                                                                       
        pd = <optimized out>                                                                                                                                                                    
        old_mask = <optimized out>                                                                                                                                                                                  
        ret = <optimized out>                                                                                                                                                                       
        tid = <optimized out>                                                                                                                                                                       
        ret = <optimized out>                                                                                                                                                                       
        resultvar = <optimized out>                                                                                                                                                                                 
        resultvar = <optimized out>                                                                                                                                                                                 
        __arg3 = <optimized out>                                                                                                                                                                                
        __arg2 = <optimized out>                                                                                                                                                                                
        __arg1 = <optimized out>                                                                                                                                                                                
        _a3 = <optimized out>                                                                                                                                                                       
        _a2 = <optimized out>
        _a1 = <optimized out>                                                                                                                                                                       
--Type <RET> for more, q to quit, c to continue without paging--                                                                                                                                                    
        __futex = <optimized out>                                                                                                                                                                                   
        resultvar = <optimized out>                                                                                                                                                                                 
        __arg3 = <optimized out>                                                                                                                                                                                
        __arg2 = <optimized out>                                                                                                                                                                                
        __arg1 = <optimized out>                                                                                                                                                                                
        _a3 = <optimized out>                                                                                                                                                                       
        _a2 = <optimized out>                                                                                                                                                                       
        _a1 = <optimized out>                                                                                                                                                                       
        __futex = <optimized out>                                                                                                                                                                                   
        __private = <optimized out>                                                                                                                                                                                 
        __oldval = <optimized out>                                                                                                                                                                                  
        result = <optimized out>                                                                                                                                                                                
#1  __pthread_kill_internal (signo=6, threadid=140419666299392)                                                                                                                                                     
    at ./nptl/pthread_kill.c:78                                                                                                                                                                             
No locals.                                                                                                              
#2  __GI___pthread_kill (threadid=140419666299392, signo=signo@entry=6)                                                                                                                                             
    at ./nptl/pthread_kill.c:89                                                                                                                                                                             
No locals.                                                                                                              

#3  0x00007fb602aa7476 in __GI_raise (sig=sig@entry=6)                                                                                                                                                              
    at ../sysdeps/posix/raise.c:26                                                                                                                                                                                  
        ret = <optimized out>                                                                                                                                                                       
#4  0x00007fb602a8d7f3 in __GI_abort () at ./stdlib/abort.c:79                                                                                                                                                      
        save_stage = 1                                                                                                                                                  
--Type <RET> for more, q to quit, c to continue without paging--
        act = {__sigaction_handler = {sa_handler = 0x55fa2959746f,                                                                                                                                                  
            sa_sigaction = 0x55fa2959746f}, sa_mask = {__val = {                                                                                                                                                    
              18446744073709551288, 11, 140723926211456, 94532958412928, 181,                                                                                                                                       
              94532923913327, 140419705906387, 140723926211472,                                                                                                                                                     
              140723926211456, 94532958412928, 94532925905808,                                                                                                                                                      
              140723926211472, 94532920570578, 94533607213200, 99, 99}},                                                                                                                                            
          sa_flags = 1335251568, sa_restorer = 0x55fa2959746f}                                                                                                                                                      
        sigs = {__val = {32, 0, 94533607213200, 6, 99, 140723926211136,                                                                                                                                             
            94532958413328, 0, 99, 16762180390345294848, 94532958413040,                                                                                                                                            
            140723926211456, 0, 94532958413328, 99, 16762180390345294848}}                                                                                                                                          
#5  0x000055fa29124e55 in xassert (msg=<optimized out>, file=<optimized out>,                                                                                                                                       
    line=<optimized out>) at ./src/debug.cc:624                                                                                                                                                                     
        __FUNCTION__ = <optimized out>                                                                                                                                                                              
#6  0x000055fa29118734 in CbcPointer<BodyProducer>::operator-> (                                                                                                                                                    
    this=<optimized out>) at ../src/base/CbcPointer.h:181                                                                                                                                                           
        c = <optimized out>                                                                                                                                                                 
#7  CbcPointer<BodyConsumer>::operator-> (this=<optimized out>)                                                                                                                                                     
    at ../src/base/CbcPointer.h:178                                                                                                                                                                                 
        c = <optimized out>                                                                                                                                                                 
        c = <optimized out>                                                                                                                                                                 
#8  JobDialer<BodyConsumer>::dial (call=..., this=<optimized out>)                                                                                                                                                  
    at base/AsyncJobCalls.h:182                                                                                                                                                                             
        __FUNCTION__ = <optimized out>                                                                                                                                                                              
--Type <RET> for more, q to quit, c to continue without paging--
#9  AsyncCallT<BodyConsumerDialer>::fire (this=0x55fa4f965270)                                                                                                                                                      
    at ../src/base/AsyncCall.h:145                                                                                                                                                                                  
No locals.                                                                                                              
#10 0x000055fa293cfaab in AsyncCallQueue::fireNext (this=<optimized out>)                                                                                                                                           
    at base/../../src/base/RefCount.h:73                                                                                                                                                                            
        call = {p_ = 0x55fa4f965270}                                                                                                                                                                                
        __FUNCTION__ = <optimized out>
#11 0x000055fa293d189a in AsyncCallQueue::fire (this=0x55fa2b930a20)
    at base/AsyncCallQueue.cc:43
        made = true
#12 0x000055fa291ad500 in EventLoop::dispatchCalls (this=0x7ffcd7a21ef0)
    at ./src/EventLoop.cc:144
        dispatchedSome = <optimized out>
#13 EventLoop::runOnce (this=0x7ffcd7a21ef0) at ./src/EventLoop.cc:121
        sawActivity = <optimized out>
        waitingEngine = 0x7ffcd7a21e30
        __FUNCTION__ = <optimized out>
#14 0x000055fa292b5f10 in EventLoop::run (this=0x7ffcd7a21ef0)
    at ./src/EventLoop.cc:83
No locals.
#15 SquidMain (argc=<optimized out>, argv=<optimized out>)
    at ./src/main.cc:1719
        cmdLine = {argv_ = std::vector of length 6, capacity 6 = {
--Type <RET> for more, q to quit, c to continue without paging--
            0x55fa29977220 "(squid-1)", 0x55fa299772e0 "--kid", 
            0x55fa299773a0 "squid-1", 0x55fa29977460 "--foreground", 
            0x55fa29977520 "-sYC", 0x0}, 
          shortOptions_ = 0x55fa299a2450 "CDFNRSYXa:d:f:hk:m::n:sl:u:vz?", 
          longOptions_ = std::vector of length 5, capacity 8 = {{<option> = {
                name = 0x55fa29977cc0 "foreground", has_arg = 0, flag = 0x0, 
                val = 2}, <No data fields>}, {<option> = {
                name = 0x55fa299778e0 "kid", has_arg = 1, flag = 0x0, 
                val = 3}, <No data fields>}, {<option> = {
                name = 0x55fa299779a0 "help", has_arg = 0, flag = 0x0, 
                val = 104}, <No data fields>}, {<option> = {
                name = 0x55fa29977a80 "version", has_arg = 0, flag = 0x0, 
                val = 118}, <No data fields>}, {<option> = {name = 0x0, 
                has_arg = 0, flag = 0x0, val = 0}, <No data fields>}}}
        WIN32_init_err = 0
        mainLoop = {errcount = 0, static Running = 0x7ffcd7a21ef0, 
          last_loop = false, engines = std::vector of length 4, capacity 4 = {
            0x7ffcd7a21e70, 0x55fa296e8fd0 <EventScheduler::_instance>, 
            0x7ffcd7a21e50, 0x7ffcd7a21e30}, timeService = 0x7ffcd7a21da8, 
          primaryEngine = 0x7ffcd7a21e30, loop_delay = 0, error = false, 
          runOnceResult = false}
        signalEngine = {<AsyncEngine> = {
            _vptr.AsyncEngine = 0x55fa296e1e50 <vtable for SignalEngine+16>}, <N--Type <RET> for more, q to quit, c to continue without paging--
o data fields>}
        store_engine = {<AsyncEngine> = {
            _vptr.AsyncEngine = 0x55fa296c8310 <vtable for StoreRootEngine+16>}, <No data fields>}
        comm_engine = {<AsyncEngine> = {
            _vptr.AsyncEngine = 0x55fa296e1e28 <vtable for CommSelectEngine+16>}, <No data fields>}
        time_engine = {
          _vptr.TimeEngine = 0x55fa296e2480 <vtable for TimeEngine+16>}
        __FUNCTION__ = <optimized out>
#16 0x000055fa291524e6 in SquidMainSafe (argv=0x7ffcd7a22208, argc=5)
    at ./src/main.cc:1406
        __FUNCTION__ = <optimized out>
#17 main (argc=5, argv=0x7ffcd7a22208) at ./src/main.cc:1394
No locals.
(gdb) 

Do you can see where the bug is?

best regards
 Waldemar
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