Re: page fault in compat_ifconf

To: riastradh%NetBSD.org@localhost, syzkaller-netbsd-bugs%googlegroups.com@localhost
Subject: Re: page fault in compat_ifconf
From: syzbot <syzbot+442c033feb784d055185%syzkaller.appspotmail.com@localhost>
Date: Thu, 07 Jul 2022 09:22:07 -0700
Hello,

syzbot tried to test the proposed patch but the build/boot failed:

 | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ +1034592| / - \ | /  [1510368- \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ +976997| / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | ]=0x6a5feb0
/ - \ | / - \ | / - \ | / - \ | / - \ | / - \ | Loading /var/db/entropy-file  
[   1.0000000] cpu_rng: rdrand/rdseed
[   1.0000000] entropy: ready
[   1.0000000] entropy: entering seed from bootloader with 256 bits of entropy
[   1.0000000] ksyms: checking .text
[   1.0000000] ksyms: checking .rodata.hotpatch
[   1.0000000] ksyms: checking .rodata
[   1.0000000] ksyms: checking link_set_x86_hotpatch_descriptors
[   1.0000000] ksyms: checking link_set_sdt_providers_set
[   1.0000000] ksyms: checking link_set_sdt_probes_set
[   1.0000000] ksyms: checking link_set_sdt_argtypes_set
[   1.0000000] ksyms: checking link_set_modules
[   1.0000000] ksyms: checking link_set_sysctl_funcs
[   1.0000000] ksyms: checking link_set_acpi_device_calls
[   1.0000000] ksyms: checking link_set_evcnts
[   1.0000000] ksyms: checking link_set_linux_module_param_info
[   1.0000000] ksyms: checking link_set_linux_module_param_desc
[   1.0000000] ksyms: checking link_set_domains
[   1.0000000] ksyms: checking link_set_ieee80211_funcs
[   1.0000000] ksyms: checking link_set_ah_chips
[   1.0000000] ksyms: checking link_set_ah_rfs
[   1.0000000] ksyms: checking link_set_dkwedge_methods
[   1.0000000] ksyms: checking link_set_prop_linkpools
[   1.0000000] ksyms: checking .data
[   1.0000000] ksyms: checking .data.cacheline_aligned
[   1.0000000] ksyms: checking .data.read_mostly
[   1.0000000] ksyms: checking .bss
[   1.0000000] ksyms: checking .note.netbsd.ident
[   1.0000000] ksyms: checking .note.Xen
[   1.0000000] ksyms: checking .ident
[   1.0000000] ksyms: checking .comment
[   1.0000000] ksyms: checking .gnu_debuglink
[   1.0000000] ksyms: checking .symtab
[   1.0000000] ksyms: checking .strtab
[   1.0000000] ksyms: checking .shstrtab
[   1.0000000] Loaded initial symtab at 0xffffffff86a00a68, strtab at 0xffffffff86b71648, # entries 62932
[   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, 2020, 2021, 2022
[   1.0000000]     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 9.99.98 (GENERIC_SYZKALLER) #0: Thu Jul  7 16:11:41 UTC 2022
[   1.0000000] 	root@ci2:/syzkaller/jobs/netbsd/kernel/sys/arch/amd64/compile/obj/GENERIC_SYZKALLER
[   1.0000000] total memory = 8191 MB
[   1.0000000] avail memory = 4044 MB
[   1.0000030] mainbus0 (root)
[   1.0000030] ACPI: RSDP 0x00000000000F2740 000014 (v00 Google)
[   1.0000030] ACPI: RSDT 0x00000000BFFFFF90 000038 (v01 Google GOOGRSDT 00000001 GOOG 00000001)
[   1.0000030] ACPI: FACP 0x00000000BFFFF330 0000F4 (v02 Google GOOGFACP 00000001 GOOG 00000001)
[   1.0000030] ACPI: DSDT 0x00000000BFFFD8C0 001A64 (v01 Google GOOGDSDT 00000001 GOOG 00000001)
[   1.0000030] ACPI: FACS 0x00000000BFFFD880 000040
[   1.0000030] ACPI: SRAT 0x00000000BFFFFE60 0000C8 (v03 Google GOOGSRAT 00000001 GOOG 00000001)
[   1.0000030] ACPI: APIC 0x00000000BFFFFDB0 000076 (v05 Google GOOGAPIC 00000001 GOOG 00000001)
[   1.0000030] ACPI: SSDT 0x00000000BFFFF430 000980 (v01 Google GOOGSSDT 00000001 GOOG 00000001)
[   1.0000030] ACPI: WAET 0x00000000BFFFFE30 000028 (v01 Google GOOGWAET 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 @ 2.20GHz, id 0x406f0
[   1.0000030] cpu0: node 0, package 0, core 0, smt 0
[   1.0000030] cpu1 at mainbus0 apid 1
[   1.0000030] cpu1: Intel(R) Xeon(R) CPU @ 2.20GHz, id 0x406f0
[   1.0000030] cpu1: node 0, package 0, core 0, smt 1
[   1.0000030] acpi0 at mainbus0: Intel ACPICA 20211217
[   1.0000030] acpi0: fixed power button present
[   1.0000030] acpi0: fixed sleep button present
[   1.0004656] pckbc1 at acpi0 (KBD, PNP0303) (kbd port): io 0x60,0x64 irq 1
[   1.0004656] pckbc2 at acpi0 (MOU, PNP0F13) (aux port): irq 12
[   1.0004656] com0 at acpi0 (COM1, PNP0501-1): io 0x3f8-0x3ff irq 4
[   1.0004656] com: ns16550a, 16-byte FIFO
[   1.0004656] com0: console
[   1.0004656] com1 at acpi0 (COM2, PNP0501-2): io 0x2f8-0x2ff irq 3
[   1.0004656] com1: ns16550a, 16-byte FIFO
[   1.0004656] com2 at acpi0 (COM3, PNP0501-3): io 0x3e8-0x3ef irq 6
[   1.0004656] com2: ns16550a, 16-byte FIFO
[   1.0004656] com3 at acpi0 (COM4, PNP0501-4): io 0x2e8-0x2ef irq 7
[   1.0004656] com3: ns16550a, 16-byte FIFO
[   1.0004656] PEVT (QEMU0001) at acpi0 not configured
[   1.0004656] ACPI: Enabled 16 GPEs in block 00 to 0F
[   1.0004656] pckbd0 at pckbc1 (kbd slot)
[   1.0004656] pckbc1: using irq 1 for kbd slot
[   1.0004656] wskbd0 at pckbd0 mux 1
[   1.0004656] pms0 at pckbc1 (aux slot)
[   1.0004656] pckbc1: using irq 12 for aux slot
[   1.0004656] wsmouse0 at pms0 mux 0
[   1.0004656] pci0 at mainbus0 bus 0: configuration mode 1
[   1.0004656] pchb0 at pci0 dev 0 function 0: Intel 82441FX (PMC) PCI and Memory Controller (rev. 0x02)
[   1.0004656] pcib0 at pci0 dev 1 function 0: Intel 82371AB (PIIX4) PCI-ISA Bridge (rev. 0x03)
[   1.0004656] piixpm0 at pci0 dev 1 function 3: Intel 82371AB (PIIX4) Power Management Controller (rev. 0x03)
[   1.0004656] piixpm0: SMBus disabled
[   1.0004656] virtio0 at pci0 dev 3 function 0
[   1.0004656] virtio0: SCSI device (rev. 0x00)
[   1.0004656] vioscsi0 at virtio0: features: 0
[   1.0004656] vioscsi0: cmd_per_lun 256 qsize 8192 seg_max 64 max_target 253 max_lun 1
[   1.0004656] virtio0: config interrupting at msix0 vec 0
[   1.0004656] virtio0: queues interrupting at msix0 vec 1
[   1.0004656] scsibus0 at vioscsi0: 254 targets, 2 luns per target
[   1.0004656] virtio1 at pci0 dev 4 function 0
[   1.0004656] virtio1: network device (rev. 0x00)
[   1.0004656] vioif0 at virtio1: features: 0x20030020<EVENT_IDX,CTRL_VQ,STATUS,MAC>
[   1.0004656] vioif0: Ethernet address 42:01:0a:80:01:6d
[   1.0004656] virtio1: config interrupting at msix1 vec 0
[   1.0004656] virtio1: queues interrupting at msix1 vec 1
[   1.0004656] genfb0 at pci0 dev 5 function 0: vendor 1ae0 product a002 (rev. 0x01)
[   1.0004656] virtio2 at pci0 dev 6 function 0
[   1.0004656] virtio2: memory balloon device (rev. 0x00)
[   1.0004656] viomb0 at virtio2: features: 0x1<MUST_TELL_HOST>
[   1.0004656] virtio2: interrupting at ioapic0 pin 10
[   1.0004656] virtio3 at pci0 dev 7 function 0
[   1.0004656] virtio3: entropy device (rev. 0x00)
[   1.0004656] viornd0 at virtio3: features: 0
[   1.0004656] virtio3: interrupting at ioapic0 pin 11
[   1.0004656] isa0 at pcib0
[   1.0004656] attimer0 at isa0 port 0x40-0x43
[   1.0004656] pcppi0 at isa0 port 0x61
[   1.0004656] spkr0 at pcppi0: PC Speaker
[   1.0004656] wsbell at spkr0 not configured
[   1.0004656] midi0 at pcppi0: PC speaker
[   1.0004656] sysbeep0 at pcppi0
[   1.0004656] attimer0: attached to pcppi0
[   1.0004656] acpicpu0 at cpu0: ACPI CPU
[   1.0004656] acpicpu1 at cpu1: ACPI CPU
[   2.0272646] cpu0 has 2 core siblings: cpu1 cpu0
[   2.0272646] cpu0 has 2 pkg siblings: cpu1 cpu0
[   2.0405724] cpu0 has 1 1st siblings: cpu0
[   2.0405724] cpu0 first in package: cpu0
[   2.0494383] cpu1 has 2 core siblings: cpu0 cpu1
[   2.0494383] cpu1 has 2 pkg siblings: cpu0 cpu1
[   2.0577508] cpu1 has 1 1st siblings: cpu0
[   2.0577508] cpu1 first in package: cpu0
[   2.2268879] sd0 at scsibus0 target 1 lun 0: <Google, PersistentDisk, 1> disk fixed
[   2.2368657] sd0: fabricating a geometry
[   2.2368657] sd0: 2048 MB, 2048 cyl, 64 head, 32 sec, 512 bytes/sect x 4194304 sectors
[   2.2468803] sd0: fabricating a geometry
[   2.2668642] dk0 at sd0: "49b813d1-8009-4c4f-b3e1-2cc288366ecc", 2097085 blocks at 64, type: ffs
[   2.2768703] dk1 at sd0: "2a5f9479-33b7-499d-8cc4-f8d9ae0937b7", 2097119 blocks at 2097152, type: swap
[   2.2768703] sd0: async, 8-bit transfers, tagged queueing
[   2.7168545] usb0 at vhci0: USB revision 2.0
[   2.7368820] uhub0 at usb0: NetBSD (0x0000) VHCI root hub (0x0000), class 9/0, rev 2.00/1.00, addr 1
[   3.2068688] usb1 at vhci1: USB revision 2.0
[   3.2368987] uhub1 at usb1: NetBSD (0x0000) VHCI root hub (0x0000), class 9/0, rev 2.00/1.00, addr 1
[   3.7268666] usb2 at vhci2: USB revision 2.0
[   3.7568864] uhub2 at usb2: NetBSD (0x0000) VHCI root hub (0x0000), class 9/0, rev 2.00/1.00, addr 1
[   4.2368648] usb3 at vhci3: USB revision 2.0
[   4.2569012] uhub3 at usb3: NetBSD (0x0000) VHCI root hub (0x0000), class 9/0, rev 2.00/1.00, addr 1
[   4.7368542] usb4 at vhci4: USB revision 2.0
[   4.7568813] uhub4 at usb4: NetBSD (0x0000) VHCI root hub (0x0000), class 9/0, rev 2.00/1.00, addr 1
[   5.2468564] usb5 at vhci5: USB revision 2.0
[   5.2668826] uhub5 at usb5: NetBSD (0x0000) VHCI root hub (0x0000), class 9/0, rev 2.00/1.00, addr 1
[   5.7468561] usb6 at vhci6: USB revision 2.0
[   5.7768948] uhub6 at usb6: NetBSD (0x0000) VHCI root hub (0x0000), class 9/0, rev 2.00/1.00, addr 1
[   6.2368518] usb7 at vhci7: USB revision 2.0
[   6.2668844] uhub7 at usb7: NetBSD (0x0000) VHCI root hub (0x0000), class 9/0, rev 2.00/1.00, addr 1
[   6.3168463] boot device: sd0
[   6.3168463] root on dk0 dumps on dk1
[   6.3368933] dump_misc_init: max_paddr = 0x240000000
[   6.3368933] mountroot: trying lfs...
[   6.3494569] mountroot: trying ffs...
[   6.3494569] root file system type: ffs
[   6.3604909] kern.module.path=/stand/amd64/9.99.98/modules
[   6.3672309] clock: unknown CMOS layout
[   6.4068820] init: copying out path `/sbin/init' 11
Thu Jul  7 16:15:43 UTC 2022
Fast boot: skipping disk checks.
[   7.6368437] /dev/dk0: file system not clean (fs_clean=0x4); please fsck(8)
[   7.6368437] /dev/dk0: lost blocks 0 files 0
swapctl: setting dump device to /dev/dk1
swapctl: adding /dev/dk1 as swap device at priority 0
Starting file system checks:
Loaded entropy from /var/db/entropy-file.
Setting tty flags.
Setting sysctl variables:
ddb.onpanic: 1 -> 1
ddb.commandonenter: trace;show registers -> "show registers;bt;show panic;ps;show all locks;show all pages;show all pools"
ddb.lines: 24 -> 0
ddb.maxwidth: 80 -> 0
Starting network.
ifconfig: SIOCAIFADDR: Invalid argument
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
route: writing to routing socket: Network is unreachable
IPv6 mode: host
Configuring network interfaces: vioif0dhcpcd-9.1.1 starting
DUID 00:04:d1:aa:f5:a0:1e:7b:90:d7:5b:f3:c7:76:bd:81:6a:77
vioif0: SIOCGIFINFO_FLAGS: Invalid argument
vioif0: SIOCSIFINFO_FLAGS: Invalid argument
[   9.8317745] vioif0: link state UP (was UNKNOWN)
vioif0: carrier acquired
vioif0: SIOCGIFINFO_FLAGS: Invalid argument
vioif0: SIOCSIFINFO_FLAGS: Invalid argument
vioif0: IAID 0a:80:01:6d
ipv6_readsecret: cannot write secret: No such file or directory
vioif0: ipv6_start: No such file or directory
vioif0: soliciting a DHCP lease
vioif0: offered 10.128.1.109 from 169.254.169.254
ipv4_addaddr: if_addaddress: Invalid argument
timed out
dhcpcd exited
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