DRD swapcontext hangs on FreeBSD 13.2 i386

[paulfloyd]

Does it hang standalone? No.

Any relationship to #163 ?

sigframe hasn't changed? Not that I can see.

When it hangs, lots of

--840:4: gdbsrv VG_(gdbserver_report_syscall) before 1 sysno 423 tid 2
--840:4: gdbsrv VG_(gdbserver_report_syscall) before 0 sysno 423 tid 2
--840:4: gdbsrv VG_(gdbserver_report_syscall) before 1 sysno 240 tid 2
--840:4: gdbsrv VG_(gdbserver_report_syscall) before 0 sysno 240 tid 3
--840:4: gdbsrv VG_(gdbserver_report_syscall) before 1 sysno 423 tid 3
--840:4: gdbsrv VG_(gdbserver_report_syscall) before 0 sysno 423 tid 3

That's
GENXY(__NR_nanosleep, sys_nanosleep), // 240
and
BSDXY(__NR_swapcontext, sys_swapcontext), // 423

Tracing syscalls

SYSCALL846,7 sys_swapcontext ( 0xfbbf1020, 0xfbbf0d60 ) --> [pre-success] NoWriteResult
SYSCALL846,7 sys_nanosleep ( 0x630be1c, 0x0 ) --> [async] ...
SYSCALL846,6 ... [async] --> Success(0x0)
SYSCALL846,6 sys_swapcontext ( 0xfbbf07d0, 0xfbbf0510 ) --> [pre-success] NoWriteResult
SYSCALL846,6 sys_nanosleep ( 0x63088ac, 0x0 ) --> [async] ...
SYSCALL846,7 ... [async] --> Success(0x0)
SYSCALL846,7 sys_swapcontext ( 0xfbbf0d60, 0xfbbf1020 ) --> [pre-success] NoWriteResult
SYSCALL846,7 sys_nanosleep ( 0x630d63c, 0x0 ) --> [async] ...

Can't see anything version specific in there.