toolchain/53060: gdb trapframe sniffer not up to date with -current

[martin%NetBSD.org@localhost]

>Number:         53060
>Category:       toolchain
>Synopsis:       gdb trapframe sniffer not up to date with -current
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Feb 27 19:05:00 +0000 2018
>Originator:     Martin Husemann
>Release:        NetBSD 8.99.12
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD night-owl.duskware.de 8.99.12 NetBSD 8.99.12 (NIGHT-OWL) #581: Mon Feb 19 16:51:19 CET 2018 martin%night-owl.duskware.de@localhost:/usr/src/sys/arch/amd64/compile/NIGHT-OWL amd64
Architecture: x86_64
Machine: amd64
>Description:

Trying to debug a kernel crash dump with gdb in -current is mostly futile:

Reading symbols from netbsd.gdb...done.
(gdb) target kvm netbsd.core
0xffffffff80222727 in cpu_reboot (howto=howto@entry=256, 
    bootstr=bootstr@entry=0x0) at ../../../../arch/amd64/amd64/machdep.c:708
708                     dumpsys();
(gdb) bt
#0  0xffffffff80222727 in cpu_reboot (howto=howto@entry=256, 
    bootstr=bootstr@entry=0x0) at ../../../../arch/amd64/amd64/machdep.c:708
#1  0xffffffff80774864 in db_sync_cmd (addr=<optimized out>, 
    have_addr=<optimized out>, count=<optimized out>, modif=<optimized out>)
    at ../../../../ddb/db_command.c:1380
#2  0xffffffff8077502c in db_command (
    last_cmdp=last_cmdp@entry=0xffffffff8146fa00 <db_last_command>)
    at ../../../../ddb/db_command.c:914
#3  0xffffffff80775393 in db_command_loop ()
    at ../../../../ddb/db_command.c:572
#4  0xffffffff80778be4 in db_trap (type=type@entry=1, code=code@entry=0)
    at ../../../../ddb/db_trap.c:90
#5  0xffffffff8021f252 in kdb_trap (type=type@entry=1, code=code@entry=0, 
    regs=regs@entry=0xffff800144bd8970)
    at ../../../../arch/amd64/amd64/db_interface.c:239
#6  0xffffffff80223e34 in trap (frame=0xffff800144bd8970)
    at ../../../../arch/amd64/amd64/trap.c:320
#7  0xffffffff8021d237 in alltraps ()
#8  0xffffffff8021db05 in breakpoint ()
#9  0xffffffff805d1a4e in comintr (arg=0xffffe4011daa0408)
    at ../../../../dev/ic/com.c:2113
#10 0xffffffff8020aeb6 in handle_ioapic_edge6 ()
#11 0x0000000000000000 in ?? ()

Looking at the same dump with crash(8) shows:

db_reboot_cmd() at db_reboot_cmd
db_command() at db_command+0xeb
db_command_loop() at db_command_loop+0x90
db_trap() at db_trap+0xe6
kdb_trap() at kdb_trap+0xe2
trap() at trap+0x4ed
--- trap (number 1) ---
breakpoint() at breakpoint+0x5
comintr() at comintr+0x782
handle_ioapic_edge6() at handle_ioapic_edge6+0x66
nvme_poll() at nvme_poll+0x12d
nvmeioctl() at nvmeioctl+0x19a
cdev_ioctl() at cdev_ioctl+0x98
VOP_IOCTL() at VOP_IOCTL+0x3b
vn_ioctl() at vn_ioctl+0xa1
sys_ioctl() at sys_ioctl+0x103
syscall() at syscall+0x1d8
--- syscall (number 54) ---

Note the interrupt frame at "handle_ioapic_edge6".

Looking at older crash dumps works, for example the one displayed by crash
like this works:

db_reboot_cmd() at db_reboot_cmd
db_command() at db_command+0xeb
db_command_loop() at db_command_loop+0x90
db_trap() at db_trap+0xe3
kdb_trap() at kdb_trap+0xe2
trap() at trap+0x593
--- trap (number 1) ---
breakpoint() at breakpoint+0x5
vpanic() at vpanic+0x140
__udivmoddi4() at __udivmoddi4
usb_transfer_complete() at usb_transfer_complete+0x292
ehci_softintr() at ehci_softintr+0x15c
usb_soft_intr() at usb_soft_intr+0x1f
softint_dispatch() at softint_dispatch+0x7a
DDB lost frame for Xsoftintr+0x4f, trying 0xffffe400bf7a7ff0
Xsoftintr() at Xsoftintr+0x4f
--- interrupt ---


Looking at amd64nbsd_trapframe_sniffer in src/external/gpl3/gdb/dist/gdb
there is a list of know interrupt frame symbols:

  find_pc_partial_function (get_frame_pc (this_frame), &name, NULL, NULL);
  return (name && ((strcmp (name, "alltraps") == 0)
                   || (strcmp (name, "calltrap") == 0)
                   || (strncmp (name, "Xtrap", 5) == 0)
                   || (strcmp (name, "osyscall1") == 0)
                   || (strcmp (name, "Xsyscall") == 0)
                   || (strncmp (name, "Xintr", 5) == 0)
                   || (strncmp (name, "Xresume", 7) == 0)
                   || (strncmp (name, "Xstray", 6) == 0)
                   || (strncmp (name, "Xrecurse", 8) == 0)
                   || (strncmp (name, "Xsoft", 5) == 0)
                   || (strcmp (name, "Xdoreti") == 0)));

but handle_ioapic_* is not in there. Not sure this would help...

>How-To-Repeat:
s/a

>Fix:
n/a