On 2021-Mar-9, at 19:17, Mark Millard <marklmi at yahoo.com> wrote: [My only testing context for this has been main, not 13.0. But it might be a 13.0 worry.] > Using the quickest to so-far-reliably-fail type of example from > another thread I used truss to see what happens, here filtered > down to two processes that appear to be involved and only > near the failure. (The overall truss output is huge from the > prior activity in the poudriere bulk relatated activity). Also, > this initiated watching from aarch64 but the failing code is > armv7. > > 83630 100199: #340(0x1,0xffffd18c,0xffffd17c) = 0 (0x0) > 83630 100199: #416(0x14,0xffffd1b4,0xffffd19c) = 0 (0x0) > 83630 100199: #7(0xffffffff,0xffffd178,0x1,0x0) = 0 (0x0) > 83731 100161: #240(0xffffd5f0,0xffffd5f0) = 0 (0x0) > 83731 100161: #1(0x0) > 83731 100161: process exit, rval = 0 > 83630 100199: SIGNAL 20 (SIGCHLD) code=CLD_EXITED pid=83731 uid=0 status=0 > 83630 100199: #341(0xffffd17c) ERR#4 'Interrupted system call' > 83630 100199: SIGNAL 11 (SIGSEGV) code=SEGV_MAPERR trapno=36 addr=0xffffffe1 > 83630 100199: process killed, signal = 11 (core dumped) > > As a reminder of the lldb backtrace of the sh.core > and the like: > > (lldb) bt > * thread #1, name = 'sh', stop reason = signal SIGSEGV > * frame #0: 0xffffe190 > frame #1: 0x00031aa8 sh`waitcmdloop(job=0x00064230) at jobs.c:608:11 > frame #2: 0x00031a24 sh`waitcmd(argc=<unavailable>, argv=<unavailable>) at jobs.c:554:13 > frame #3: 0x00028f54 sh`evalcommand(cmd=0x400ad0e4, flags=<unavailable>, backcmd=0x00000000) at eval.c:1107:16 > frame #4: 0x00027800 sh`evaltree(n=0x400ad0e4, flags=<unavailable>) at eval.c:289:4 > frame #5: 0x000344d0 sh`cmdloop(top=1) at main.c:221:4 > frame #6: 0x000342f4 sh`main(argc=<unavailable>, argv=<unavailable>) at main.c:168:3 > frame #7: 0x0002480c sh`__start(argc=8, argv=<unavailable>, env=<unavailable>, ps_strings=<unavailable>, obj=0x400b4004, cleanup=0x40081aa0) at crt1_c.c:92:7 > (lldb) up > frame #1: 0x00031aa8 sh`waitcmdloop(job=0x00064230) at jobs.c:608:11 > 605 break; > 606 } > 607 } > -> 608 } while (dowait(DOWAIT_BLOCK | DOWAIT_SIG, (struct job *)NULL) != -1); > 609 > 610 sig = pendingsig_waitcmd; > 611 pendingsig_waitcmd = 0; > > (lldb) disass > sh`waitcmdloop: > 0x31a54 <+0>: push {r4, r5, r6, r7, r8, r9, r10, r11, lr} > 0x31a58 <+4>: add r11, sp, #28 > 0x31a5c <+8>: sub sp, sp, #4 > 0x31a60 <+12>: movw r6, #0x3ea0 > 0x31a64 <+16>: movw r7, #0x3e9c > 0x31a68 <+20>: movw r9, #0x4040 > 0x31a6c <+24>: movw r8, #0x3ea4 > 0x31a70 <+28>: mov r4, r0 > 0x31a74 <+32>: movt r6, #0x6 > 0x31a78 <+36>: movt r7, #0x6 > 0x31a7c <+40>: movt r9, #0x6 > 0x31a80 <+44>: mov r10, #0 > 0x31a84 <+48>: movt r8, #0x6 > 0x31a88 <+52>: cmp r4, #0 > 0x31a8c <+56>: beq 0x31ab4 ; <+96> at jobs.c:590:37 > 0x31a90 <+60>: ldrb r0, [r4, #0x18] > 0x31a94 <+64>: cmp r0, #2 > 0x31a98 <+68>: beq 0x31b84 ; <+304> [inlined] getjobstatus at jobs.c:575 > 0x31a9c <+72>: mov r0, #3 > 0x31aa0 <+76>: mov r1, #0 > 0x31aa4 <+80>: bl 0x32bcc ; dowait at jobs.c:1142 > -> 0x31aa8 <+84>: cmn r0, #1 > > > For reference a local context around the > SIGSEGV looks like (all lines in the range > selected): > > . . . > 83833 102738: fcntl(2,F_DUPFD_CLOEXEC,0xa) = 10 (0xa) > 83833 102738: openat(AT_FDCWD,"/dev/null",O_WRONLY|O_CREAT|O_TRUNC,0666) = 3 (0x3) > 83833 102738: dup2(3,2) = 2 (0x2) > 83833 102738: close(3) = 0 (0x0) > 83833 102738: unlink("./.data.json.SYR1bCaL") = 0 (0x0) > 83833 102738: dup2(10,2) = 2 (0x2) > 83833 102738: close(10) = 0 (0x0) > 83833 102738: exit(0x0) > 83833 102738: process exit, rval = 0 > 77872 100638: wait4(-1,{ EXITED,val=0 },0x0,0x0) = 83833 (0x14779) > 77872 100638: fcntl(0,F_DUPFD_CLOEXEC,0xa) = 10 (0xa) > 77872 100638: openat(AT_FDCWD,"/var/run/poudriere/lock-poudriere-shared-json_top.pid",O_RDONLY,00) = 3 (0x3) > 77872 100638: dup2(3,0) = 0 (0x0) > 77872 100638: close(3) = 0 (0x0) > 77872 100638: fcntl(2,F_DUPFD_CLOEXEC,0xa) = 11 (0xb) > 77872 100638: openat(AT_FDCWD,"/dev/null",O_WRONLY|O_CREAT|O_TRUNC,0666) = 3 (0x3) > 77872 100638: dup2(3,2) = 2 (0x2) > 77872 100638: close(3) = 0 (0x0) > 77872 100638: lseek(0,0x0,SEEK_CUR) = 0 (0x0) > 77872 100638: read(0,"77563",1024) = 5 (0x5) > 77872 100638: read(0,0xffffffffb9e8,1024) = 0 (0x0) > 77872 100638: dup2(10,0) = 0 (0x0) > 77872 100638: close(10) = 0 (0x0) > 77872 100638: dup2(11,2) = 2 (0x2) > 77872 100638: close(11) = 0 (0x0) > 77872 100638: fcntl(2,F_DUPFD_CLOEXEC,0xa) = 10 (0xa) > 77872 100638: openat(AT_FDCWD,"/dev/null",O_WRONLY|O_CREAT|O_TRUNC,0666) = 3 (0x3) > 77872 100638: dup2(3,2) = 2 (0x2) > 77872 100638: close(3) = 0 (0x0) > 77872 100638: rmdir("/var/run/poudriere/lock-poudriere-shared-json_top") = 0 (0x0) > 77872 100638: dup2(10,2) = 2 (0x2) > 77872 100638: close(10) = 0 (0x0) > 77872 100638: sigprocmask(SIG_SETMASK,{ },0x0) = 0 (0x0) > 77872 100638: fcntl(2,F_DUPFD_CLOEXEC,0xa) = 10 (0xa) > 77872 100638: openat(AT_FDCWD,"/dev/null",O_WRONLY|O_CREAT|O_TRUNC,0666) = 3 (0x3) > 77872 100638: dup2(3,2) = 2 (0x2) > 77872 100638: close(3) = 0 (0x0) > 77872 100638: sigaction(SIGINFO,{ 0x239c30 SA_RESTART ss_t },{ SIG_DFL 0x0 ss_t }) = 0 (0x0) > 83731 100161: #240(0xffffd5f0,0xffffd5f0) = 0 (0x0) > -- UNKNOWN FreeBSD32 SYSCALL 1 -- > 83731 100161: #1(0x0) > 83731 100161: process exit, rval = 0 > 83630 100199: SIGNAL 20 (SIGCHLD) code=CLD_EXITED pid=83731 uid=0 status=0 > 83630 100199: #341(0xffffd17c) ERR#4 'Interrupted system call' > 83630 100199: SIGNAL 11 (SIGSEGV) code=SEGV_MAPERR trapno=36 addr=0xffffffe1 > 83630 100199: process killed, signal = 11 (core dumped) > 83316 100123: #7(0xffffffff,0xffffca58,0x0,0x0) = 83630 (0x146ae) > -- UNKNOWN FreeBSD32 SYSCALL 477 -- > 83316 100123: #477(0x0,0x7000,0x3,0xc001002,0xffffffff,0x40401428,0x0,0x0) = 1077833728 (0x403e7000) > -- UNKNOWN FreeBSD32 SYSCALL 552 -- > 83316 100123: #552(0xffffff9c,0xffffc504,0xffffc908,0x0) ERR#2 'No such file or directory' > -- UNKNOWN FreeBSD32 SYSCALL 552 -- > 83316 100123: #552(0xffffff9c,0xffffc504,0xffffc908,0x0) ERR#2 'No such file or directory' > -- UNKNOWN FreeBSD32 SYSCALL 552 -- > 83316 100123: #552(0xffffff9c,0xffffc504,0xffffc908,0x0) ERR#2 'No such file or directory' > -- UNKNOWN FreeBSD32 SYSCALL 552 -- > 83316 100123: #552(0xffffff9c,0xffffc504,0xffffc908,0x0) ERR#2 'No such file or directory' > -- UNKNOWN FreeBSD32 SYSCALL 477 -- > 83316 100123: #477(0x0,0x1000,0x3,0xc001002,0xffffffff,0x40401428,0x0,0x0) = 1077862400 (0x403ee000) > -- UNKNOWN FreeBSD32 SYSCALL 4 -- > 83316 100123: #4(0x2,0x403ee000,0x21) = 33 (0x21) > -- UNKNOWN FreeBSD32 SYSCALL 477 -- > 83316 100123: #477(0x0,0x1000,0x3,0xc001002,0xffffffff,0x40401428,0x0,0x0) = 1077866496 (0x403ef000) > -- UNKNOWN FreeBSD32 SYSCALL 477 -- > 83316 100123: #477(0x0,0x1000,0x3,0xc001002,0xffffffff,0x40401428,0x0,0x0) = 1077870592 (0x403f0000) > -- UNKNOWN FreeBSD32 SYSCALL 477 -- > 83316 100123: #477(0x0,0x1000,0x3,0xc001002,0xffffffff,0x40401428,0x0,0x0) = 1077874688 (0x403f1000) > -- UNKNOWN FreeBSD32 SYSCALL 4 -- > 83316 100123: #4(0x1,0x403ef000,0x2e) = 46 (0x2e) > -- UNKNOWN FreeBSD32 SYSCALL 542 -- > 83316 100123: #542(0xffffcd54,0x0) = 0 (0x0) > -- UNKNOWN FreeBSD32 SYSCALL 2 -- > 83842 100199: <new process> > 83316 100123: #2() = 83842 (0x14782) > -- UNKNOWN FreeBSD32 SYSCALL 6 -- > -- UNKNOWN FreeBSD32 SYSCALL 6 -- > 83316 100123: #6(0x7) = 0 (0x0) > 83842 100199: #6(0x5) = 0 (0x0) > . . . Turns out that the failure happens on the processors with out-of-order execution and the like but works on the strictly in-order cortex-a53. (For as much testing as I've done.) So it looks like some form of synchronization is missing that in-order-only does not need. (This would be the 2nd time I've run into such for FreeBSD aarch64 if it holds true. The prior example was fixed a fair time ago.) The testing status . . . Problem replicated using the following contexts to attempt the textproc/itstool build, targeting armv7 (cortex-a7): cortex-a72 aarch64 MACHHIATObin Double Shot cortex-a57 aarch64 OverDrive 1000 (No successful builds for the above 2, all stopping in configure the same way.) No problem using the following to build textproc/itstool, targeting armv7: cortex-a53 aarch64 Rock64 (armv7 on aarch64 case) cortext-a7 armv7 OrangePi+ 2ed (native armv7 case) It will take a long time to run a full poudriere bulk that will build about 200 ports, targeting the cortex-a7 on the slower cortex-a53: days. So further evidence that the cortex-a53 does not get the problem will take a while. === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)Received on Wed Mar 10 2021 - 04:11:32 UTC
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