kern/59465: Recurring kernel panic with -current (10.99.14): "heart stopped beating"

[david%gutteridge.ca@localhost]

>Number:         59465
>Category:       kern
>Synopsis:       Recurring kernel panic with -current (10.99.14): "heart stopped beating"
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 13 03:10:00 +0000 2025
>Originator:     David H. Gutteridge
>Release:        current (10.99.14 from early June)
>Organization:
My Computer Ate My Work LLC
>Environment:
NetBSD arcusxx.nonus-porta.net 10.99.14 NetBSD 10.99.14 (GENERIC) #0: Tue Jun  3 20:25:27 UTC 2025  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
I am encountering reproducible "heart stopped beating" panics. These
seem to occur when particular X11 activities are in progress. For
example, if I start xscreensaver-demo and start asking for samples of
OpenGL screensavers, that tends to kill it. But it has also crashed
with simpler activities (from a graphical perspective, perhaps), like
an Xfce session starting up.

Crash version 10.99.14, image version 10.99.14.
crash: _kvm_kvatop(0)
Kernel compiled without options LOCKDEBUG.
System panicked: cpu2[97 softclk/2]: heart stopped beating
Backtrace from time of crash is available.
crash> bt
sljit_modcmd() at 0
kern_reboot() at kern_reboot+0x93
vpanic() at vpanic+0x17b
panic() at printf_nostamp
defibrillator() at defibrillator+0x6b
ipi_msg_cpu_handler() at ipi_msg_cpu_handler+0x68
ipi_cpu_handler() at ipi_cpu_handler+0xa2
x86_ipi_handler() at x86_ipi_handler+0x71
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x18
--- interrupt ---
mutex_spin_enter() at mutex_spin_exit
callout_softclock() at callout_softclock+0xd9
softint_dispatch() at softint_dispatch+0x112
crash> ps | grep '>' | grep -v idle/
18728>18728 7   2   8020000   ffff99500a932000                  X
1272 > 1272 7   1   8020100   ffff994fb93dbc00               cron
0    >  408 7   0       200   ffff994fb8855000            ioflush
0    >   97 7   2       200   ffff994fb72da800          softclk/2

crash> show proc /a ffff99500a932000
lwp_t ffff99500a932000
X: pid 18728 proc ffff99500887a0c0 vmspace/map ffff99500159a040 flags 4300
> lwp 18728 ffff99500a932000 pcb ffffdc894b3ea000
    stat 7 flags 8020000 cpu 2 pri 43 ref 0
crash> show proc /a ffff994fb72da800
lwp_t ffff994fb72da800
system: pid 0 proc ffffffff8188c780 vmspace/map ffffffff819769e0 flags 20002
> lwp 97 [softclk/2] ffff994fb72da800 pcb ffffdc8938861000
    stat 7 flags 200 cpu 2 pri 220 ref 0
  lwp 96 [softbio/2] ffff994fb72da400 pcb ffffdc893885a000
    stat 1 flags 200 cpu 2 pri 221 ref 0
  lwp 30 [softnet/2] ffff994fb72da000 pcb ffffdc8938853000
    stat 1 flags 200 cpu 2 pri 222 ref 0
  lwp 29 [idle/2] ffff994fb725dc00 pcb ffffdc8938844000
    stat 1 flags 201 cpu 2 pri 0 ref 0
  lwp 28 [xcall/1] ffff994fb725d800 pcb ffffdc8938834000
    stat 3 flags 200 cpu 1 pri 127 ref 0
    wmesg xcall wchan ffffdc8937e78010
  lwp 27 [softser/1] ffff994fb725d400 pcb ffffdc893882d000
    stat 1 flags 200 cpu 1 pri 223 ref 0
  lwp 26 [softclk/1] ffff994fb725d000 pcb ffffdc8938826000
    stat 1 flags 200 cpu 1 pri 220 ref 0
  lwp 25 [softbio/1] ffff99568d749c00 pcb ffffdc893881f000
    stat 1 flags 200 cpu 1 pri 221 ref 0
  lwp 24 [softnet/1] ffff99568d749800 pcb ffffdc8938818000
    stat 1 flags 200 cpu 1 pri 222 ref 0
  lwp 23 [idle/1] ffff99568d749400 pcb ffffdc89387e8000
    stat 1 flags 201 cpu 1 pri 0 ref 0
  lwp 22 [lnxsyswq] ffff99568d749000 pcb ffffdc8938796000
    stat 3 flags 200 cpu 1 pri 43 ref 0
    wmesg lnxsyswq wchan ffff995692871e08
  lwp 21 [lnxubdwq] ffff99568d75fc00 pcb ffffdc893878f000
    stat 3 flags 200 cpu 3 pri 43 ref 0
    wmesg lnxubdwq wchan ffff995692871d08
  lwp 20 [lnxpwrwq] ffff99568d75f800 pcb ffffdc8938788000
    stat 3 flags 200 cpu 4 pri 43 ref 0
    wmesg lnxpwrwq wchan ffff995692871c08
  lwp 19 [lnxlngwq] ffff99568d75f400 pcb ffffdc8938781000
    stat 3 flags 200 cpu 4 pri 43 ref 0
    wmesg lnxlngwq wchan ffff995692871b08
  lwp 18 [lnxhipwq] ffff99568d75f000 pcb ffffdc893877a000
    stat 3 flags 200 cpu 3 pri 43 ref 0
    wmesg lnxhipwq wchan ffff995692871a08
  lwp 17 [lnxrcugc] ffff99568d77bc00 pcb ffffdc8938773000
    stat 3 flags 240 cpu 1 pri 43 ref 0
    wmesg lnxrcugc wchan ffffffff818b3208
  lwp 16 [sysmon] ffff99568d77b800 pcb ffffdc893876c000
    stat 3 flags 200 cpu 3 pri 96 ref 0
    wmesg smtaskq wchan ffffffff818fab00
  lwp 15 [pmfsuspend] ffff99568d77b400 pcb ffffdc8938765000
    stat 3 flags 200 cpu 4 pri 43 ref 0
    wmesg pmfsuspend wchan ffff9956918266c8
  lwp 14 [pmfevent] ffff99568d77b000 pcb ffffdc893875e000
    stat 3 flags 200 cpu 0 pri 43 ref 0
    wmesg pmfevent wchan ffff995691826588
  lwp 13 [sopendfree] ffff99568e7a3c00 pcb ffffdc8938757000
    stat 3 flags 200 cpu 0 pri 96 ref 0
    wmesg sopendfr wchan ffffffff81982ab0
  lwp 12 [ifwdog] ffff99568e7a3800 pcb ffffdc8938750000
    stat 3 flags 200 cpu 2 pri 222 ref 0
    wmesg ifwdog wchan ffff995691826448
  lwp 11 [iflnkst] ffff99568e7a3400 pcb ffffdc8938749000
    stat 3 flags 200 cpu 3 pri 222 ref 0
    wmesg iflnkst wchan ffff995691826308
  lwp 10 [nfssilly] ffff99568e7a3000 pcb ffffdc8938742000
    stat 3 flags 200 cpu 0 pri 43 ref 0
    wmesg nfssilly wchan ffff9956918261c8
  lwp 9 [pooldisp] ffff9956917d7c00 pcb ffffdc893873b000
    stat 3 flags 200 cpu 0 pri 43 ref 0
    wmesg pooldisp wchan ffff995692871728
  lwp 8 [modunload] ffff9956917d7800 pcb ffffdc8938734000
    stat 3 flags 240 cpu 1 pri 125 ref 0
    wmesg mod_unld wchan ffffffff81975ab0
  lwp 7 [xcall/0] ffff9956917d7400 pcb ffffdc893872d000
    stat 3 flags 200 cpu 0 pri 127 ref 0
    wmesg xcall wchan ffffffff8183ce50
  lwp 6 [softser/0] ffff9956917d7000 pcb ffffdc8938726000
    stat 1 flags 200 cpu 0 pri 223 ref 0
  lwp 5 [softclk/0] ffff995691811c00 pcb ffffdc893871f000
    stat 1 flags 200 cpu 0 pri 220 ref 0
  lwp 4 [softbio/0] ffff995691811800 pcb ffffdc8938718000
    stat 1 flags 200 cpu 0 pri 221 ref 0
  lwp 3 [softnet/0] ffff995691811400 pcb ffffdc89382c9000
    stat 1 flags 200 cpu 0 pri 222 ref 0
  lwp 2 [idle/0] ffff995691811000 pcb ffffdc89382c2000
    stat 1 flags 201 cpu 0 pri 0 ref 0
  lwp 0 [swapper] ffffffff8188c000 pcb ffffffff81d56000
    stat 3 flags 200 cpu 3 pri 125 ref 0
    wmesg uvm wchan ffffffff8188c000

>How-To-Repeat:
As above.
>Fix:
Unknown.