assert failed: pg->wire_count > 0

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 5eba7b0ad839 Fix typo in kcov.h
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=165ade68c00000
dashboard link: https://syzkaller.appspot.com/bug?extid=a76c618a6808a0fda475

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a76c61...@syzkaller.appspotmail.com

[ 239.1062114] panic: kernel diagnostic assertion "pg->wire_count > 0"
failed: file "/syzkaller/managers/netbsd/kernel/sys/uvm/uvm_page.c", line
1594
[ 239.1062114] cpu0: Begin traceback...
[ 239.1166106] vpanic() at netbsd:vpanic+0x214
[ 239.1166106] _GLOBAL__sub_D_65535_0_cpu_configure() at
netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[ 239.1374013] uvm_fault_lower_enter() at netbsd:uvm_fault_lower_enter+0x429
[ 239.1481770] uvm_fault_internal() at netbsd:uvm_fault_internal+0x17e7
[ 239.1603900] uvm_fault_wire() at netbsd:uvm_fault_wire+0x56
[ 239.1687024] uvm_map_pageable() at netbsd:uvm_map_pageable+0x5fb
[ 239.1893839] sys_shmat() at netbsd:sys_shmat+0x46a
[ 239.1997810] sys___syscall() at netbsd:sys___syscall+0xe2
[ 239.2101785] syscall() at netbsd:syscall+0x30e
[ 239.2101785] --- syscall (number 198) ---
[ 239.2234721] 7b760f63f4aa:
[ 239.2234721] cpu0: End traceback...

[ 239.2318560] dumping to dev 4,1 (offset=0, size=0): not possible
[ 239.2318560] rebooting...
SeaBIOS (version 1.8.2-20190204_181744-google)
Total RAM Size = 0x00000001e0000000 = 7680 MiB
CPUs found: 2 Max CPUs supported: 2
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0
removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f2a00: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Booting from Hard Disk 0...

>> NetBSD/x86 BIOS Boot, Revision 5.10 (Tue Jul 17 14:59:51 UTC 2018) (from
>> NetBSD 8.0)
>> Memory: 639/3144640 k

1. Boot normally
2. Boot single user
3. Disable ACPI
4. Disable ACPI and SMP
5. Drop to boot prompt


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit: 5eba7b0ad839 Fix typo in kcov.h
git tree: netbsd

console output: https://syzkaller.appspot.com/x/log.txt?x=12609cb2c00000
dashboard link: https://syzkaller.appspot.com/bug?extid=a76c618a6808a0fda475
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1239f5d0c00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130b6862c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a76c61...@syzkaller.appspotmail.com

[ 59.9832818] panic: kernel diagnostic assertion "pg->wire_count > 0"

failed: file "/syzkaller/managers/netbsd/kernel/sys/uvm/uvm_page.c", line
1594

[ 59.9832818] cpu0: Begin traceback...
[ 59.9902004] vpanic() at netbsd:vpanic+0x214
[ 59.9971152] _GLOBAL__sub_D_65535_0_cpu_configure() at
netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[ 60.0040278] uvm_fault_lower_enter() at netbsd:uvm_fault_lower_enter+0x429
[ 60.0109445] uvm_fault_internal() at netbsd:uvm_fault_internal+0x17e7
[ 60.0247756] uvm_fault_wire() at netbsd:uvm_fault_wire+0x56
[ 60.0386055] uvm_map_pageable() at netbsd:uvm_map_pageable+0x5fb
[ 60.0465558] sys_shmat() at netbsd:sys_shmat+0x46a
[ 60.0593518] sys_syscall() at netbsd:sys_syscall+0xe2
[ 60.0681804] syscall() at netbsd:syscall+0x30e
[ 60.0756398] --- syscall (number 0) ---
[ 60.0851330] 74049ac3f4ca:
[ 60.0898293] cpu0: End traceback...

[ 60.0948714] dumping to dev 4,1 (offset=0, size=0): not possible
[ 60.0948714] rebooting...

SeaBIOS (version 1.8.2-20190204_181744-google)
Total RAM Size = 0x00000001e0000000 = 7680 MiB
CPUs found: 2 Max CPUs supported: 2
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0
removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f2a00: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Booting from Hard Disk 0...

>> NetBSD/x86 BIOS Boot, Revision 5.10 (Tue Jul 17 14:59:51 UTC 2018) (from
>> NetBSD 8.0)
>> Memory: 639/3144640 k

1. Boot normally
2. Boot single user
3. Disable ACPI
4. Disable ACPI and SMP
5. Drop to boot prompt

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/ - \ | / - ]=0x2b4fc38
\ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - WARNING: couldn't
open /var/db/entropy-file
WARNING: 1 module failed to load
[ 1.0000000] pool redzone disabled for 'pdppl'
[ 1.0000000] pool redzone disabled for 'kmem-4096'
[ 1.0000000] Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002,
2003, 2004, 2005,
[ 1.0000000] 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014,
2015, 2016, 2017,
[ 1.0000000] 2018, 2019 The NetBSD Foundation, Inc. All rights
reserved.
[ 1.0000000] Copyright (c) 1982, 1986, 1989, 1991, 1993
[ 1.0000000] The Regents of the University of California. All rights
reserved.

[ 1.0000000] NetBSD 8.99.34 (GENERIC_SYZKALLER) #9: Mon Feb 25 20:27:03
UTC 2019
[ 1.0000000]
root@ci2:/syzkaller/managers/netbsd/kernel/sys/arch/amd64/compile/obj/GENERIC_SYZKALLER
[ 1.0000000] total memory = 7679 MB
[ 1.0000000] avail memory = 6662 MB
[ 1.0000000] pool redzone disabled for 'buf64k'
[ 1.0000000] cpu_rng: RDRAND
[ 1.0000000] running cgd selftest aes-xts-256 aes-xts-512 done
[ 1.0000030] mainbus0 (root)
[ 1.0000030] ACPI: RSDP 0x00000000000F2A40 000014 (v00 Google)
[ 1.0000030] ACPI: RSDT 0x00000000BFFFDBA0 000038 (v01 Google GOOGRSDT
00000001 GOOG 00000001)
[ 1.0000030] ACPI: FACP 0x00000000BFFFFF00 0000F4 (v02 Google GOOGFACP
00000001 GOOG 00000001)
[ 1.0000030] ACPI: DSDT 0x00000000BFFFDBE0 0017B2 (v01 Google GOOGDSDT
00000001 GOOG 00000001)
[ 1.0000030] ACPI: FACS 0x00000000BFFFFEC0 000040
[ 1.0000030] ACPI: SSDT 0x00000000BFFFF590 000930 (v01 Google GOOGSSDT
00000001 GOOG 00000001)
[ 1.0000030] ACPI: APIC 0x00000000BFFFF4A0 000076 (v01 Google GOOGAPIC
00000001 GOOG 00000001)
[ 1.0000030] ACPI: WAET 0x00000000BFFFF470 000028 (v01 Google GOOGWAET
00000001 GOOG 00000001)
[ 1.0000030] ACPI: SRAT 0x00000000BFFFF3A0 0000C8 (v01 Google GOOGSRAT
00000001 GOOG 00000001)
[ 1.0000030] ACPI: 2 ACPI AML tables successfully acquired and loaded
[ 1.0000030] ioapic0 at mainbus0 apid 0
[ 1.0000030] cpu0 at mainbus0 apid 0
[ 1.0000030] cpu0: Intel(R) Xeon(R) CPU @ 2.30GHz, id 0x306f0
[ 1.0000030] cpu0: package 0, core 0, smt 0
[ 1.0000030] cpu1 at mainbus0 apid 1
[ 1.0000030] cpu1: Intel(R) Xeon(R) CPU @ 2.30GHz, id 0x306f0
[ 1.0000030] cpu1: package 0, core 0, smt 1
[ 1.0000030] acpi0 at mainbus0: Intel ACPICA 20181213
[ 1.0000030] acpi0: fixed power button present
[ 1.0000030] acpi0: fixed sleep button present