Re: qemu-riscv32 usermode still broken?

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Re: qemu-riscv32 usermode still broken?

From:	Alistair Francis
Subject:	Re: qemu-riscv32 usermode still broken?
Date:	Tue, 11 Jun 2024 14:43:49 +1000
On Wed, Sep 20, 2023 at 6:39 AM Andreas K. Huettel <dilfridge@gentoo.org> wrote:
>
> Hi Alistair,
>
> > It would be great to get a strace of the failure to narrow down what
> > it is. From there it should be not too hard to find and fix.
>
> thanks a lot. Here's as much info as I could get with strace mechanisms.
>
> 1) What I did, without any tracing
>
> pinacolada ~ # qemu-riscv32 -L /var/lib/machines/riscv32 
> /var/lib/machines/riscv32/bin/bash
> pinacolada ~ # python
> Python 3.11.5 (main, Aug 27 2023, 18:39:05) [GCC 12.3.1 20230623] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> >>>
> [1]+  Stopped                 python
> ^C^C
> pinacolada ~ # ^C
> pinacolada ~ # fg
> python
>
> pinacolada ~ #
> exit
>
> * When I type Ctrl-Z at the python prompt, the terminal hangs.
> * With several Ctrl-C I can get back to the riscv32 bash, and then python is 
> suspended in the background.
>
> * Now I did this again, first with qemu tracing system calls, then with 
> strace tracing qemu
> * In both cases, the log starts when I type "python", and ends (with quickly 
> repeated output lines)
>   after pressing Ctrl-Z
>
> 2)
> pinacolada ~ # QEMU_STRACE=1 qemu-riscv32 -L /var/lib/machines/riscv32 
> /var/lib/machines/riscv32/bin/bash
> (QEMU_STRACE is getting unset in my bashrc, so no subprocesses are traced)
>
> (...)
> 2472050 write(2,0xe56c0,58)pinacolada ~ #  = 58
> 2472050 Unknown syscall 413
> 2472050 read(0,0x2b2aa29b,1) = 1
> 2472050 Unknown syscall 413
> 2472050 write(2,0xe56c0,1)p = 1
> 2472050 Unknown syscall 413
> 2472050 read(0,0x2b2aa29b,1) = 1
> 2472050 Unknown syscall 413
> 2472050 write(2,0xe56c0,1)y = 1
> 2472050 Unknown syscall 413
> 2472050 read(0,0x2b2aa29b,1) = 1
> 2472050 Unknown syscall 413
> 2472050 write(2,0xe56c0,1)t = 1
> 2472050 Unknown syscall 413
> 2472050 read(0,0x2b2aa29b,1) = 1
> 2472050 Unknown syscall 413
> 2472050 write(2,0xe56c0,1)h = 1
> 2472050 Unknown syscall 413
> 2472050 read(0,0x2b2aa29b,1) = 1
> 2472050 Unknown syscall 413
> 2472050 write(2,0xe56c0,1)o = 1
> 2472050 Unknown syscall 413
> 2472050 read(0,0x2b2aa29b,1) = 1
> 2472050 Unknown syscall 413
> 2472050 write(2,0xe56c0,1)n = 1
> 2472050 Unknown syscall 413
> 2472050 read(0,0x2b2aa29b,1) = 1
> 2472050 write(2,0xe56c0,1)
>  = 1
>  = 9050 write(2,0xe56c0,9)
> 2472050 ioctl(0,TCSETSW,{c_iflag = ICRNL|IXON|IXOFF|IUTF8,c_oflag = 
> OPOST|ONLCR,c_cflag = B38400,CS8,CREAD,c_lflag = 
> ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN,c_cc = "",c_line = ''}) = 0
> 2472050 rt_sigaction(SIGINT,0x2b2aa1bc,0x2b2aa244) = 0
> 2472050 rt_sigaction(SIGHUP,0x2b2aa1bc,0x2b2aa244) = 0
> 2472050 rt_sigaction(SIGALRM,0x2b2aa1bc,0x2b2aa244) = 0
> 2472050 rt_sigaction(SIGWINCH,0x2b2aa1bc,0x2b2aa244) = 0
> 2472050 rt_sigaction(SIGINT,0x2b2aa14c,0x2b2aa1d4) = 0
> 2472050 clock_gettime64(CLOCK_REALTIME_COARSE,0x2b2aa268) = 0 
> ({tv_sec=1695154794,tv_nsec=760883171})
> 2472050 
> statx(AT_FDCWD,".",AT_NO_AUTOMOUNT|AT_STATX_SYNC_AS_STAT,STATX_BASIC_STATS,0x2b2aaa78)
>  = 0
> 2472050 
> statx(AT_FDCWD,"/usr/local/sbin/python",AT_NO_AUTOMOUNT|AT_STATX_SYNC_AS_STAT,STATX_BASIC_STATS,0x2b2aa998)
>  = -1 errno=2 (No such file or directory)
> 2472050 
> statx(AT_FDCWD,"/usr/local/bin/python",AT_NO_AUTOMOUNT|AT_STATX_SYNC_AS_STAT,STATX_BASIC_STATS,0x2b2aa998)
>  = -1 errno=2 (No such file or directory)
> 2472050 
> statx(AT_FDCWD,"/usr/sbin/python",AT_NO_AUTOMOUNT|AT_STATX_SYNC_AS_STAT,STATX_BASIC_STATS,0x2b2aa998)
>  = -1 errno=2 (No such file or directory)
> 2472050 
> statx(AT_FDCWD,"/usr/bin/python",AT_NO_AUTOMOUNT|AT_STATX_SYNC_AS_STAT,STATX_BASIC_STATS,0x2b2aa998)
>  = 0
> 2472050 
> statx(AT_FDCWD,"/usr/bin/python",AT_NO_AUTOMOUNT|AT_STATX_SYNC_AS_STAT,STATX_BASIC_STATS,0x2b2aa8e8)
>  = 0
> 2472050 geteuid() = 0
> 2472050 getegid() = 0
> 2472050 getuid() = 0
> 2472050 getgid() = 0
> 2472050 
> faccessat(AT_FDCWD,"/usr/bin/python",X_OK,AT_SYMLINK_NOFOLLOW|0x1da42089) = 0
> 2472050 
> statx(AT_FDCWD,"/usr/bin/python",AT_NO_AUTOMOUNT|AT_STATX_SYNC_AS_STAT,STATX_BASIC_STATS,0x2b2aa8e8)
>  = 0
> 2472050 geteuid() = 0
> 2472050 getegid() = 0
> 2472050 getuid() = 0
> 2472050 getgid() = 0
> 2472050 
> faccessat(AT_FDCWD,"/usr/bin/python",R_OK,AT_SYMLINK_NOFOLLOW|0x1da42089) = 0
> 2472050 rt_sigprocmask(SIG_BLOCK,NULL,0x2b2aabec,8) = 0
> 2472050 rt_sigprocmask(SIG_BLOCK,0x2b2aaaec,0x2b2aab6c,8) = 0
> 2472050 rt_sigaction(SIGTERM,0x2b2aa85c,0x2b2aa8e4) = 0
> 2472050 rt_sigprocmask(SIG_BLOCK,0x2b2aa98c,0x2b2aaa0c,8) = 0
> 2472050 rt_sigprocmask(SIG_SETMASK,0x2b2aaa0c,NULL,8) = 0
> 2472050 pipe2(0x5560d3f4,0) = 0
> 2472050 
> clone(CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|0x11,child_stack=0x00000000,parent_tidptr=0x00000000,tls=0x00000000,child_tidptr=0x2b2d20c8)
>  = 2472055
> 2472050 rt_sigaction(SIGTERM,0x2b2aa85c,0x2b2aa8e4) = 0
>  = 0
> 2472050 setpgid(2472055,2472055) = 0
> 2472055 set_robust_list(0x2b2d20cc,12) = 2472050 
> rt_sigprocmask(SIG_SETMASK,0x2b2aab6c,-1 errno=38 (Function not 
> implemented)NULL,
> 8) = 0
> 2472055 getpid() = 2472055
> 2472055 rt_sigprocmask(SIG_SETMASK,0x55616e24,NULL,8) = 0
> 2472050 rt_sigprocmask(SIG_BLOCK,0x2b2aaaac,0x2b2aab2c,8) = 0
> 2472050 close(3) = 0
> 2472050 close(4) = 0
> 2472055 rt_sigaction(SIGTSTP,0x2b2aa84c,0x2b2aa8d4) = 0
> 2472055 rt_sigaction(SIGTTIN,0x2b2aa84c,0x2b2aa8d4) = 0
> 2472055 rt_sigaction(SIGTTOU,0x2b2aa85c,0x2b2aa8e4) = 0
> 2472055 setpgid(2472055,2472055) = 0
> 2472055 rt_sigprocmask(SIG_BLOCK,0x2b2aa99c,0x2b2aaa1c,8) = 0
> 2472055 ioctl(255,TIOCSPGRP,2472055) = 0
> 2472055 rt_sigprocmask(SIG_SETMASK,0x2b2aaa1c,NULL,8) = 0
> 2472050 ioctl(255,TIOCGPGRP,0x2b2aaa78) = 0 (2472055)2472055
> close(4) = 0
> 2472050 rt_sigprocmask(SIG_SETMASK,0x2b2aab2c,NULL,2472055 
> 8)read(3,0x2b2aaaeb,1) = 0 =
> 0
> 2472055 close(3) = 0
> 2472050 rt_sigprocmask(SIG_BLOCK,0x2b2aabac,0x2b2aac2c,8) = 0
> 2472055 rt_sigaction(SIGHUP,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGILL,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGTRAP,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGIOT,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGFPE,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGBUS,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGSEGV,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGSYS,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGPIPE,0x2b2aaacc,NULL) = 0
> 2472050 2472055 
> waitid(0,-1,0x2b2aaa7c,0xe)rt_sigaction(SIGALRM,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGXCPU,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGXFSZ,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGVTALRM,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGUSR1,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGUSR2,0x2b2aaacc,NULL) = 0
> 2472055 rt_sigaction(SIGINT,0x2b2aaa0c,0x2b2aaa94) = 0
> 2472055 rt_sigaction(SIGQUIT,0x2b2aaa0c,0x2b2aaa94) = 0
> 2472055 rt_sigaction(SIGTERM,0x2b2aaa0c,0x2b2aaa94) = 0
> 2472055 rt_sigaction(SIGCHLD,0x2b2aaa0c,0x2b2aaa94) = 0
> 2472055 execve("/usr/bin/python",{"python",NULL})Python 3.11.5 (main, Aug 27 
> 2023, 18:39:05) [GCC 12.3.1 20230623] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> >>>  = 0
> 2472050 rt_sigprocmask(SIG_BLOCK,0x2b2aa9ec,0x2b2aaa6c,8) = 0
> 2472050 rt_sigprocmask(SIG_SETMASK,0x2b2aaa6c,NULL,8) = 0
> 2472050 rt_sigprocmask(SIG_BLOCK,0x2b2aa9ec,0x2b2aaa6c,8) = 0
> 2472050 rt_sigprocmask(SIG_SETMASK,0x2b2aaa6c,NULL,8) = 0
> 2472050 rt_sigprocmask(SIG_BLOCK,0x2b2aaa6c,0x2b2aaaec,8) = 0
> 2472050 ioctl(255,TIOCSPGRP,2472050) = 0
> 2472050 rt_sigprocmask(SIG_SETMASK,0x2b2aaaec,NULL,8) = 0
> 2472050 ioctl(255,TCSETSW,{c_iflag = ICRNL|IXON|IXOFF|IUTF8,c_oflag = 
> OPOST|ONLCR,c_cflag = B38400,CS8,CREAD,c_lflag = 
> ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN,c_cc = "",c_line = ''}) = 0
> 2472050 ioctl(255,TIOCGWINSZ,0x2b2aab74) = 0 ({49,194,1749,896})
> 2472050 write(2,0xe56c0,1)
>  = 1
> 2472050 
> openat(AT_FDCWD,"/usr/share/locale/locale.alias",O_RDONLY|O_LARGEFILE|O_CLOEXEC)
>  = 3
> 2472050 
> statx(3,"",AT_EMPTY_PATH|AT_NO_AUTOMOUNT|AT_STATX_SYNC_AS_STAT,STATX_BASIC_STATS,0x2b2aa3b8)
>  = 0
> 2472050 read(3,0xf4d00,4096) = 2998
> 2472050 read(3,0xf4d00,4096) = 0
> 2472050 close(3) = 0
> 2472050 
> openat(AT_FDCWD,"/usr/share/locale/en_US.utf8/LC_MESSAGES/bash.mo",O_RDONLY|O_LARGEFILE)
>  = -1 errno=2 (No such file or directory)
> 2472050 
> openat(AT_FDCWD,"/usr/share/locale/en_US/LC_MESSAGES/bash.mo",O_RDONLY|O_LARGEFILE)
>  = -1 errno=2 (No such file or directory)
> 2472050 
> openat(AT_FDCWD,"/usr/share/locale/en.utf8/LC_MESSAGES/bash.mo",O_RDONLY|O_LARGEFILE)
>  = -1 errno=2 (No such file or directory)
> 2472050 
> openat(AT_FDCWD,"/usr/share/locale/en/LC_MESSAGES/bash.mo",O_RDONLY|O_LARGEFILE)
>  = -1 errno=2 (No such file or directory)
> 2472050 write(2,0xe56c0,37)[1]+  Stopped                 python
>  = 37
> 2472050 rt_sigprocmask(SIG_SETMASK,0x2b2aac2c,NULL,8) = 0
> --- SIGCHLD {si_signo=SIGCHLD, si_code=5, si_pid=2472055, si_uid=0, 
> si_status=20, si_utime=2, si_stime=0} ---
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> 2472050 waitid(0,-1,0x2b2aa70c,0xf) = 0
> (...)
>
> 3)
> pinacolada ~ # strace qemu-riscv32 -L /var/lib/machines/riscv32 
> /var/lib/machines/riscv32/bin/bash
>
> (...)
> write(2, "\33]0;root@pinacolada:~\7\33[01;31mpi"..., 58pinacolada ~ # ) = 58
> pselect6(1, [0], NULL, NULL, NULL, {sigmask=[], sigsetsize=8}) = 1 (in [0])
> read(0, "p", 1)                         = 1
> pselect6(1, [0], NULL, [0], {tv_sec=0, tv_nsec=0}, NULL) = 0 (Timeout)
> write(2, "p", 1p)                        = 1
> pselect6(1, [0], NULL, NULL, NULL, {sigmask=[], sigsetsize=8}) = 1 (in [0])
> read(0, "y", 1)                         = 1
> pselect6(1, [0], NULL, [0], {tv_sec=0, tv_nsec=0}, NULL) = 0 (Timeout)
> write(2, "y", 1y)                        = 1
> pselect6(1, [0], NULL, NULL, NULL, {sigmask=[], sigsetsize=8}) = 1 (in [0])
> read(0, "t", 1)                         = 1
> pselect6(1, [0], NULL, [0], {tv_sec=0, tv_nsec=0}, NULL) = 0 (Timeout)
> write(2, "t", 1t)                        = 1
> pselect6(1, [0], NULL, NULL, NULL, {sigmask=[], sigsetsize=8}) = 1 (in [0])
> read(0, "h", 1)                         = 1
> pselect6(1, [0], NULL, [0], {tv_sec=0, tv_nsec=0}, NULL) = 0 (Timeout)
> write(2, "h", 1h)                        = 1
> pselect6(1, [0], NULL, NULL, NULL, {sigmask=[], sigsetsize=8}) = 1 (in [0])
> read(0, "o", 1)                         = 1
> pselect6(1, [0], NULL, [0], {tv_sec=0, tv_nsec=0}, NULL) = 0 (Timeout)
> write(2, "o", 1o)                        = 1
> pselect6(1, [0], NULL, NULL, NULL, {sigmask=[], sigsetsize=8}) = 1 (in [0])
> read(0, "n", 1)                         = 1
> pselect6(1, [0], NULL, [0], {tv_sec=0, tv_nsec=0}, NULL) = 0 (Timeout)
> write(2, "n", 1n)                        = 1
> pselect6(1, [0], NULL, NULL, NULL, {sigmask=[], sigsetsize=8}) = 1 (in [0])
> read(0, "\r", 1)                        = 1
> write(2, "\n", 1
> )                       = 1
> )             = 904l\r", 9
> ioctl(0, TCSETSW, {c_iflag=ICRNL|IXON|IXOFF|IUTF8, 
> c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B38400|CS8|CREAD, 
> c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigaction(SIGINT, {sa_handler=0x4c2160, sa_mask=~[RTMIN RT_1], 
> sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x5cdb50}, NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigaction(SIGHUP, {sa_handler=0x4c2160, sa_mask=~[RTMIN RT_1], 
> sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x5cdb50}, NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigaction(SIGALRM, {sa_handler=0x4c2160, sa_mask=~[RTMIN RT_1], 
> sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x5cdb50}, NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigaction(SIGWINCH, {sa_handler=0x4c2160, sa_mask=~[RTMIN RT_1], 
> sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x5cdb50}, NULL, 8) = > 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigaction(SIGINT, {sa_handler=0x4c2160, sa_mask=~[RTMIN RT_1], 
> sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x5cdb50}, NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> statx(AT_FDCWD, ".", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, 
> STATX_BASIC_STATS, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, 
> stx_attributes=0, stx_mode=S_IFDIR|0700, stx_size=16384, ...}) = 0
> statx(AT_FDCWD, "/usr/local/sbin/python", 
> AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, STATX_BASIC_STATS, 0x7fff3f875900) = 
> -1 ENOENT (No such file or directory)
> statx(AT_FDCWD, "/usr/local/bin/python", 
> AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, STATX_BASIC_STATS, 0x7fff3f875900) = 
> -1 ENOENT (No such file or directory)
> statx(AT_FDCWD, "/usr/sbin/python", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, 
> STATX_BASIC_STATS, 0x7fff3f875900) = -1 ENOENT (No such file or directory)
> statx(AT_FDCWD, "/usr/bin/python", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, 
> STATX_BASIC_STATS, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, 
> stx_attributes=0, stx_mode=S_IFREG|0755, stx_size=18808, ...}) = 0
> statx(AT_FDCWD, "/usr/bin/python", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, 
> STATX_BASIC_STATS, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, 
> stx_attributes=0, stx_mode=S_IFREG|0755, stx_size=18808, ...}) = 0
> geteuid()                               = 0
> getegid()                               = 0
> getuid()                                = 0
> getgid()                                = 0
> faccessat2(AT_FDCWD, "/usr/bin/python", X_OK, 0) = 0
> statx(AT_FDCWD, "/usr/bin/python", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, 
> STATX_BASIC_STATS, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, 
> stx_attributes=0, stx_mode=S_IFREG|0755, stx_size=18808, ...}) = 0
> geteuid()                               = 0
> getegid()                               = 0
> getuid()                                = 0
> getgid()                                = 0
> faccessat2(AT_FDCWD, "/usr/bin/python", R_OK, 0) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [INT TERM CHLD], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigaction(SIGTERM, {sa_handler=0x4c2160, sa_mask=~[RTMIN RT_1], 
> sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x5cdb50}, NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [INT TERM CHLD], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [INT TERM CHLD], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [INT TERM CHLD], NULL, 8) = 0
> pipe2([3, 4], 0)                        = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> clone(child_stack=NULL, 
> flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, 
> child_tidptr=0x228b790) = 2472081
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [INT TERM CHLD], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigaction(SIGTERM, {sa_handler=SIG_IGN, sa_mask=~[RTMIN RT_1], 
> sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x5cdb50}, NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [INT TERM CHLD], NULL, 8) = 0
> setpgid(2472081, 2472081)               = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
> close(3)                                = 0
> close(4)                                = 0
> ioctl(255, TIOCGPGRP, [2472081])        = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
> waitid(P_ALL, -1, Python 3.11.5 (main, Aug 27 2023, 18:39:05) [GCC 12.3.1 
> 20230623] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> >>> {si_signo=SIGCHLD, si_code=CLD_STOPPED, si_pid=2472081, si_uid=0, 
> >>> si_status=SIGTSTP, si_utime=140734259223024 /* 1407342592230.24 s */, 
> >>> si_stime=4923637 /* 49236.37 s */}, WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [CHLD TSTP TTIN TTOU], NULL, 8) = 0
> ioctl(255, TIOCSPGRP, [2472076])        = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
> ioctl(255, TCSETSW, {c_iflag=ICRNL|IXON|IXOFF|IUTF8, 
> c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B38400|CS8|CREAD, 
> c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
> ioctl(255, TIOCGWINSZ, {ws_row=49, ws_col=194, ws_xpixel=1749, 
> ws_ypixel=896}) = 0
> write(2, "\n", 1
> )                       = 1
> futex(0x8800f8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
> readlink("/usr", 0x7fff3f8742a0, 1023)  = -1 EINVAL (Invalid argument)
> readlink("/usr/share", 0x7fff3f8742a0, 1023) = -1 EINVAL (Invalid argument)
> readlink("/usr/share/locale", 0x7fff3f8742a0, 1023) = -1 EINVAL (Invalid 
> argument)
> readlink("/usr/share/locale/locale.alias", 0x7fff3f8742a0, 1023) = -1 EINVAL 
> (Invalid argument)
> access("/var/lib/machines/riscv32/usr/share/locale/locale.alias", F_OK) = 0
> openat(AT_FDCWD, "/var/lib/machines/riscv32/usr/share/locale/locale.alias", 
> O_RDONLY|O_CLOEXEC) = 3
> statx(3, "", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT|AT_EMPTY_PATH, 
> STATX_BASIC_STATS, {stx_mask=STATX_ALL|STATX_MNT_ID, stx_attributes=0, 
> stx_mode=S_IFREG|0644, stx_size=2998, ...}) = 0
> read(3, "# Locale name alias data base.\n#"..., 4096) = 2998
> read(3, "", 4096)                       = 0
> close(3)                                = 0
> readlink("/usr", 0x7fff3f8742a0, 1023)  = -1 EINVAL (Invalid argument)
> readlink("/usr/share", 0x7fff3f8742a0, 1023) = -1 EINVAL (Invalid argument)
> readlink("/usr/share/locale", 0x7fff3f8742a0, 1023) = -1 EINVAL (Invalid 
> argument)
> readlink("/usr/share/locale/en_US.utf8", 0x7fff3f8742a0, 1023) = -1 ENOENT 
> (No such file or directory)
> access("/var/lib/machines/riscv32/usr/share/locale/en_US.utf8/LC_MESSAGES/bash.mo",
>  F_OK) = -1 ENOENT (No such file or directory)
> openat(AT_FDCWD, "/usr/share/locale/en_US.utf8/LC_MESSAGES/bash.mo", 
> O_RDONLY) = -1 ENOENT (No such file or directory)
> readlink("/usr", 0x7fff3f8742a0, 1023)  = -1 EINVAL (Invalid argument)
> readlink("/usr/share", 0x7fff3f8742a0, 1023) = -1 EINVAL (Invalid argument)
> readlink("/usr/share/locale", 0x7fff3f8742a0, 1023) = -1 EINVAL (Invalid 
> argument)
> readlink("/usr/share/locale/en_US", 0x7fff3f8742a0, 1023) = -1 EINVAL 
> (Invalid argument)
> readlink("/usr/share/locale/en_US/LC_MESSAGES", 0x7fff3f8742a0, 1023) = -1 
> EINVAL (Invalid argument)
> readlink("/usr/share/locale/en_US/LC_MESSAGES/bash.mo", 0x7fff3f8742a0, 1023) 
> = -1 ENOENT (No such file or directory)
> access("/var/lib/machines/riscv32/usr/share/locale/en_US/LC_MESSAGES/bash.mo",
>  F_OK) = -1 ENOENT (No such file or directory)
> openat(AT_FDCWD, "/usr/share/locale/en_US/LC_MESSAGES/bash.mo", O_RDONLY) = 
> -1 ENOENT (No such file or directory)
> readlink("/usr", 0x7fff3f8742a0, 1023)  = -1 EINVAL (Invalid argument)
> readlink("/usr/share", 0x7fff3f8742a0, 1023) = -1 EINVAL (Invalid argument)
> readlink("/usr/share/locale", 0x7fff3f8742a0, 1023) = -1 EINVAL (Invalid 
> argument)
> readlink("/usr/share/locale/en.utf8", 0x7fff3f8742a0, 1023) = -1 ENOENT (No 
> such file or directory)
> access("/var/lib/machines/riscv32/usr/share/locale/en.utf8/LC_MESSAGES/bash.mo",
>  F_OK) = -1 ENOENT (No such file or directory)
> openat(AT_FDCWD, "/usr/share/locale/en.utf8/LC_MESSAGES/bash.mo", O_RDONLY) = 
> -1 ENOENT (No such file or directory)
> readlink("/usr", 0x7fff3f8742a0, 1023)  = -1 EINVAL (Invalid argument)
> readlink("/usr/share", 0x7fff3f8742a0, 1023) = -1 EINVAL (Invalid argument)
> readlink("/usr/share/locale", 0x7fff3f8742a0, 1023) = -1 EINVAL (Invalid 
> argument)
> readlink("/usr/share/locale/en", 0x7fff3f8742a0, 1023) = -1 EINVAL (Invalid 
> argument)
> readlink("/usr/share/locale/en/LC_MESSAGES", 0x7fff3f8742a0, 1023) = -1 
> EINVAL (Invalid argument)
> readlink("/usr/share/locale/en/LC_MESSAGES/bash.mo", 0x7fff3f8742a0, 1023) = 
> -1 ENOENT (No such file or directory)
> access("/var/lib/machines/riscv32/usr/share/locale/en/LC_MESSAGES/bash.mo", 
> F_OK) = -1 ENOENT (No such file or directory)
> openat(AT_FDCWD, "/usr/share/locale/en/LC_MESSAGES/bash.mo", O_RDONLY) = -1 
> ENOENT (No such file or directory)
> write(2, "[1]+  Stopped                 py"..., 37[1]+  Stopped               
>   python
> ) = 37
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_STOPPED, si_pid=2472081, si_uid=0, 
> si_status=SIGTSTP, si_utime=2 /* 0.02 s */, si_stime=0} ---
> rt_sigreturn({mask=~[BUS SEGV]})        = 0
> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], NULL, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> waitid(P_ALL, -1, {}, WNOHANG|WEXITED|WSTOPPED|WCONTINUED, NULL) = 0
> (...)

Ok!

So on my x86 machine I see this

--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=285545,
si_uid=1000, si_status=0, si_utime=0, si_stime=0} ---
wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}],
WNOHANG|WSTOPPED|WCONTINUED, NULL) = 285545
wait4(-1, 0x7ffe3eeb8210, WNOHANG|WSTOPPED|WCONTINUED, NULL) = 0
rt_sigreturn({mask=[INT]})              = 0
close(3)                                = 0

It all looks ok.

Maybe the host_to_target_siginfo() function in QEMU is the issue?
Something in here?
https://github.com/qemu/qemu/blob/master/linux-user/signal.c#L335

Nothing jumps out with a quick look though

Alistair

>
>
>
> --
> Andreas K. Hüttel
> dilfridge@gentoo.org
> Gentoo Linux developer
> (council, toolchain, base-system, perl, libreoffice)
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