NetBSD Problem Report #56617
From www@netbsd.org Tue Jan 11 16:55:15 2022
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for <gnats-bugs@gnats.NetBSD.org>; Tue, 11 Jan 2022 16:55:15 +0000 (UTC)
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Date: Tue, 11 Jan 2022 16:55:13 +0000 (UTC)
From: prlw1@cam.ac.uk
Reply-To: prlw1@cam.ac.uk
To: gnats-bugs@NetBSD.org
Subject: assertion "!samepage" failed
X-Send-Pr-Version: www-1.0
>Number: 56617
>Category: kern
>Synopsis: assertion "!samepage" failed
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Jan 11 17:00:00 +0000 2022
>Originator: Patrick Welche
>Release: NetBSD-9.99.93/amd64 of 10 Jan 2022
>Organization:
>Environment:
>Description:
Laptop was under load running a simulation. Opened firefox while waiting
and hit this panic:
panic: kernel diagnostic assertion "!samepage" failed: file "../../../../arch/x86/x86/pmap.c", line 5020
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x14a
kern_assert() at netbsd:kern_assert+0x4b
pmap_enter_ma() at netbsd:pmap_enter_ma+0xb27
pmap_enter_default() at netbsd:pmap_enter_default+0x29
uvm_fault_internal() at netbsd:uvm_fault_internal+0x167a
trap() at netbsd:trap+0x1b4
--- trap (number 6) ---
7f7fe06f6c50:
cpu0: End traceback...
dumping to dev 168,5 (offset=33942087, size=4145847):
dump succeeded
Kernel lock error: _kernel_lock,239: spinout
lock address : 0xffffffff8105b380 type : spin
initialized : 0xffffffff80a68020
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 2 last held: 0
relevant lwp : 0xffffa45f7e7b22c0 last held: 000000000000000000
last locked : 0xffffffff8043f0ac unlocked*: 0xffffffff8043f0c2
curcpu holds : 0 wanted by: 0xffffa45f7e7b22c0
rebooting...
(gdb) target kvm netbsd.0.core
0xffffffff80222765 in cpu_reboot (howto=howto@entry=260,
bootstr=bootstr@entry=0x0) at ../../../../arch/amd64/amd64/machdep.c:720
720 dumpsys();
(gdb) bt
#0 0xffffffff80222765 in cpu_reboot (howto=howto@entry=260,
bootstr=bootstr@entry=0x0) at ../../../../arch/amd64/amd64/machdep.c:720
#1 0xffffffff808cd967 in kern_reboot (howto=howto@entry=260,
bootstr=bootstr@entry=0x0) at ../../../../kern/kern_reboot.c:73
#2 0xffffffff80912a3a in vpanic (
fmt=0xffffffff80d8d008 "kernel %sassertion \"%s\" failed: file \"%s\", line %d ", ap=ap@entry=0xffffb2814ff1ca88) at ../../../../kern/subr_prf.c:290
#3 0xffffffff80a67f17 in kern_assert (
fmt=fmt@entry=0xffffffff80d8d008 "kernel %sassertion \"%s\" failed: file \"%s\", line %d ") at ../../../../../../lib/libkern/kern_assert.c:51
#4 0xffffffff8044de89 in pmap_enter_ma (pmap=0xffffa45fa60a1400,
va=va@entry=140187202957312, ma=<optimized out>, pa=5229785088,
prot=prot@entry=5, flags=flags@entry=32, domid=domid@entry=0)
at ../../../../arch/x86/x86/pmap.c:5020
#5 0xffffffff8044e0d2 in pmap_enter_default (pmap=<optimized out>,
va=va@entry=140187202957312, pa=<optimized out>, prot=prot@entry=5,
flags=flags@entry=32) at ../../../../arch/x86/x86/pmap.c:4788
#6 0xffffffff80869ca5 in uvm_fault_lower_neighbor (pg=0xffffb28000c86f80,
currva=140187202957312, flt=0xffffb2814ff1cc98, ufi=0xffffb2814ff1cc60)
at ../../../../uvm/uvm_fault.c:2097
#7 uvm_fault_lower_lookup (pages=0xffffb2814ff1cd50, flt=0xffffb2814ff1cc98,
ufi=0xffffb2814ff1cc60) at ../../../../uvm/uvm_fault.c:2035
#8 uvm_fault_lower (pages=0xffffb2814ff1cd50, flt=0xffffb2814ff1cc98,
ufi=0xffffb2814ff1cc60) at ../../../../uvm/uvm_fault.c:1873
#9 uvm_fault_internal (orig_map=orig_map@entry=0xffffa45f80ab29e0,
vaddr=vaddr@entry=140187202969600, access_type=access_type@entry=4,
fault_flag=fault_flag@entry=0) at ../../../../uvm/uvm_fault.c:942
#10 0xffffffff80224bd6 in trap (frame=0xffffb2814ff1cf00)
at ../../../../arch/amd64/amd64/trap.c:520
#11 0xffffffff8021da8d in alltraps ()
#12 0x00007f7fe9f7dc28 in ?? ()
#13 0x00007f7ff13c3640 in ?? ()
#14 0x0000000000000018 in ?? ()
#15 0x0000000000000000 in ?? ()
(gdb) frame 7
#7 uvm_fault_lower_lookup (pages=0xffffb2814ff1cd50, flt=0xffffb2814ff1cc98,
ufi=0xffffb2814ff1cc60) at ../../../../uvm/uvm_fault.c:2035
2035 uvm_fault_lower_neighbor(ufi, flt, currva, curpg);
(gdb) print *ufi
$1 = {orig_map = 0xffffa45f80ab29e0, orig_rvaddr = 140187202969600,
orig_size = 4096, map = 0xffffa45f80ab29e0, mapv = 25555,
entry = 0xffffa45faa5fac40, size = 4096}
(gdb) print *flt
$2 = {access_type = 4, startva = 140187202957312, npages = 8, centeridx = 3,
narrow = true, wire_mapping = false, wire_paging = false, cow_now = false,
enter_prot = 5, anon_spare = 0x0, promote = false,
lower_lock_type = RW_READER, upper_lock_type = RW_READER}
(note to self: /usr/obj/crash/netbsd.0.core)
>How-To-Repeat:
Nothing obvious
>Fix:
(Contact us)
$NetBSD: query-full-pr,v 1.46 2020/01/03 16:35:01 leot Exp $
$NetBSD: gnats_config.sh,v 1.9 2014/08/02 14:16:04 spz Exp $
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