Re: kern/57560: xennetback_xenbus.c rev 1.109 broke guests, causes DOM0 reboot

[Martin Husemann <martin%duskware.de@localhost>]

The following reply was made to PR port-xen/57560; it has been noted by GNATS.

From: Martin Husemann <martin%duskware.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/57560: xennetback_xenbus.c rev 1.109 broke guests, causes
 DOM0 reboot
Date: Sat, 5 Aug 2023 15:51:43 +0200

 Taylor suggested I try the broken kernel again, but with options HEARTBEAT
 enabled - and that got me:
 
 [ 178.0039847] panic: cpu0: softints stuck for 16 seconds
 [ 178.0039847] cpu0: Begin traceback...
 [ 178.0039847] vpanic() at netbsd:vpanic+0x163
 [ 178.0039847] panic() at netbsd:panic+0x3c
 [ 178.0039847] heartbeat() at netbsd:heartbeat+0x29f
 [ 178.0039847] hardclock() at netbsd:hardclock+0x7d
 [ 178.0039847] xen_timer_handler() at netbsd:xen_timer_handler+0x99
 [ 178.0039847] evtchn_do_event() at netbsd:evtchn_do_event+0x118
 [ 178.0039847] do_hypervisor_callback() at netbsd:do_hypervisor_callback+0x167
 [ 178.0039847] Xhandle_hypervisor_callback() at netbsd:Xhandle_hypervisor_callback+0x1a
 [ 178.0039847] --- interrupt ---
 [ 178.0039847] _kernel_lock() at netbsd:_kernel_lock+0xec
 [ 178.0039847] xen_intr_biglock_wrapper() at netbsd:xen_intr_biglock_wrapper+0x14
 [ 178.0039847] evtchn_do_event() at netbsd:evtchn_do_event+0x118
 [ 178.0039847] do_hypervisor_callback() at netbsd:do_hypervisor_callback+0x167
 [ 178.0039847] Xhandle_hypervisor_callback() at netbsd:Xhandle_hypervisor_callback+0x1a
 [ 178.0039847] --- interrupt ---
 [ 178.0039847] hypercall_page() at netbsd:hypercall_page+0x3aa
 [ 178.0039847] idle_loop() at netbsd:idle_loop+0x146
 [ 178.0039847] cpu0: End traceback...
 [ 178.0039847] fatal breakpoint trap in supervisor mode
 [ 178.0039847] trap type 1 code 0 rip 0xffffffff8024196d cs 0xe030 rflags 0x202 cr2 0x7f1eece9f58a ilevel 0x7 rsp 0xffff98004103e888
 [ 178.0039847] curlwp 0xffff980000ff7040 pid 0.2 lowest kstack 0xffff98004103a2c0
 Stopped in pid 0.2 (system) at  netbsd:breakpoint+0x5:  leave
 breakpoint() at netbsd:breakpoint+0x5
 vpanic() at netbsd:vpanic+0x163
 panic() at netbsd:panic+0x3c
 heartbeat() at netbsd:heartbeat+0x29f
 hardclock() at netbsd:hardclock+0x7d
 xen_timer_handler() at netbsd:xen_timer_handler+0x99
 evtchn_do_event() at netbsd:evtchn_do_event+0x118
 do_hypervisor_callback() at netbsd:do_hypervisor_callback+0x167
 Xhandle_hypervisor_callback() at netbsd:Xhandle_hypervisor_callback+0x1a
 --- interrupt ---
 _kernel_lock() at netbsd:_kernel_lock+0xec
 xen_intr_biglock_wrapper() at netbsd:xen_intr_biglock_wrapper+0x14
 evtchn_do_event() at netbsd:evtchn_do_event+0x118
 do_hypervisor_callback() at netbsd:do_hypervisor_callback+0x167
 Xhandle_hypervisor_callback() at netbsd:Xhandle_hypervisor_callback+0x1a
 --- interrupt ---
 hypercall_page() at netbsd:hypercall_page+0x3aa
 idle_loop() at netbsd:idle_loop+0x146
 ds          0
 es          766a
 fs          e838
 gs          e888
 rdi         7
 rsi         1
 rbp         ffff98004103e888
 rbx         44c5
 rdx         1
 rcx         ffffffffffffff
 rax         800000004200000
 r8          700000004200000
 r9          700000000000000
 r10         0
 r11         fffffffe
 r12         ffffffff80f797b8    ostype+0xbc2b0
 r13         ffff98004103e8d0
 r14         104
 r15         b2
 rip         ffffffff8024196d    breakpoint+0x5
 cs          e030
 rflags      202
 rsp         ffff98004103e888
 ss          e02b
 netbsd:breakpoint+0x5:  leave
 
 
 Martin