Re: port-amd64/50730: Go test panics the kernel (kqueue related?)

[christos%zoulas.com@localhost (Christos Zoulas)]

On Jan 30,  5:10pm, bsiegert%NetBSD.org@localhost (bsiegert%NetBSD.org@localhost) wrote:
-- Subject: port-amd64/50730: Go test panics the kernel (kqueue related?)

This is still racy sometimes when the process exits.
    crash> ps
    1662     5 3   2   1000000   fffffe83f7aff700          http.test lwpwait
    1662 >   4 7   7   1100000   fffffe83f853f540          http.test
    1662     1 2   7   1100000   fffffe83f823f920          http.test

This thread tries to close the socket:
    crash> t/a fffffe83f853f540
    trace: pid 1662 lid 4 at 0xfffffe810330bd68
    knote_detach() at knote_detach+0x23f
    knote_fdclose() at knote_fdclose+0x68
    fd_close() at fd_close+0x246
    sys_close() at sys_close+0x3a
    sy_call() at sy_call+0x40
    sy_invoke() at sy_invoke+0xd5
    syscall() at syscall+0xfe
    --- syscall (number 6) ---

This thread is exiting:
    crash> t/a fffffe83f7aff700
    trace: pid 1662 lid 5 at 0xfffffe8103d8bc68
    sleepq_block() at sleepq_block+0xf6
    cv_wait() at cv_wait+0x116
    lwp_wait() at lwp_wait+0x34a
    exit_lwps() at exit_lwps+0x13b
    exit1() at exit1+0x146
    exit1() at exit1
    sy_call() at sy_call+0x40
    sy_invoke() at sy_invoke+0xd5
    syscall() at syscall+0xfe
    --- syscall (number 1) ---

This thread is trying to lock the socket which we are trying to close:
    crash> t/a fffffe83f823f920
    trace: pid 1662 lid 1 at 0xfffffe81042919c8
    sleepq_block() at sleepq_block+0xf6
    turnstile_block() at turnstile_block+0x4e6
    mutex_enter() at mutex_enter+0x51d
    solock() at solock+0x23
    filt_soread() at filt_soread+0x36
    kqueue_scan() at kqueue_scan+0x4c2
    kevent1() at kevent1+0x315
    sys___kevent50() at sys___kevent50+0x5b
    sy_call() at sy_call+0x40
    sy_invoke() at sy_invoke+0xd5
    syscall() at syscall+0xfe
    --- syscall (number 435) ---

So we deadlock.