Re: Subject: Re: port-xen/45975: panic: HYPERVISOR_mmu_update failed, ret: -22 on -current MP domU (amd64)

[Greg Oster <oster%cs.usask.ca@localhost>]

The following reply was made to PR port-xen/45975; it has been noted by GNATS.

From: Greg Oster <oster%cs.usask.ca@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: bouyer%antioche.eu.org@localhost, bouyer%NetBSD.org@localhost, 
gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost, riz%NetBSD.org@localhost
Subject: Re: Subject: Re: port-xen/45975: panic: HYPERVISOR_mmu_update
 failed, ret: -22 on -current MP domU (amd64)
Date: Tue, 14 Feb 2012 14:58:15 -0600

 I just saw this panic with today's -current.  Relevant(?) bits look
 like:
 
 ...
 pmap_kenter_pa: mapping already present
 evtchn_do_event: handler 0xffffffff80121b77 didn't lower ipl 8 7
 evtchn_do_event: handler 0xffffffff80121b77 didn't lower ipl 8 7
 xpq_flush_queue: 1 entries (0 successful)
 0x000000017e476de0: 0x0000000190e00007
 panic: HYPERVISOR_mmu_update failed, ret: -22
 
 fatal breakpoint trap in supervisor mode
 trap type 1 code 0 rip ffffffff80134575 cs e030 rflags 246 cr2
 7f7ff78002b4 cpl 6 rsp ffffa0005f9ff710 Stopped in pid 19481.1 (sh) at
 netbsd:breakpoint+0x5:  leave breakpoint() at netbsd:breakpoint+0x5
 vpanic() at netbsd:vpanic+0x1f2
 printf_nolog() at netbsd:printf_nolog
 xpq_queue_machphys_update() at netbsd:xpq_queue_machphys_update
 pmap_enter_ma() at netbsd:pmap_enter_ma+0xb74
 pmap_enter() at netbsd:pmap_enter+0x35
 uvm_fault_internal() at netbsd:uvm_fault_internal+0xf17
 trap() at netbsd:trap+0x5f5
 --- trap (number 1600061548) ---
 65736961720034:
 ds          ffea
 es          f750
 fs          100
 gs          e180
 rdi         0
 rsi         d
 rbp         ffffa0005f9ff710
 rbx         104
 rdx         0
 rcx         8
 rax         1
 r8          ffffa00004559000
 r9          1
 r10         0
 r11         ffffa0000c761380
 r12         ffffffff804b7350    copyright+0x40090
 r13         ffffa0005f9ff750
 r14         ffffffea
 r15         2
 rip         ffffffff80134575    breakpoint+0x5
 cs          e030
 rflags      246
 rsp         ffffa0005f9ff710
 ss          e02b
 netbsd:breakpoint+0x5:  leave
 db{2}> 
 db{2}> 
 
 relevant bits of 'xm dmesg' looks like:
 
 (XEN) domain.c:509:d9 Attempt to change CR4 flags 00002620 -> 00000620
 (XEN) domain.c:509:d9 Attempt to change CR4 flags 00002620 -> 00000620
 (XEN) domain.c:509:d9 Attempt to change CR4 flags 00002620 -> 00000620
 (XEN) mm.c:2012:d9 Bad type (saw 00000000e8000001 != exp
 0000000020000000) for mfn 190e00 (pfn 59a5b) 
 (XEN) mm.c:745:d9 Attempt to create linear p.t. with write perms
 
 If you need more info, just let me know... (this is a test vm, so can
 be killed at will/on demand..)
 
 Later...
 
 Greg Oster