Re: [syzbot] [mm] KMSAN: uninit-value in virtqueue_add (4)

[syzbot]

Hello,

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

 processors activated (8800.82 BogoMIPS)
[    1.438059][    T1] devtmpfs: initialized
[    1.438059][    T1] x86/mm: Memory block size: 128MB
[    1.537424][    T1] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    1.541248][    T1] futex hash table entries: 512 (order: 3, 32768 bytes, vmalloc)
[    1.543999][    T1] PM: RTC time: 02:09:52, date: 2024-02-25
[    1.551035][    T1] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[    1.570747][    T1] audit: initializing netlink subsys (disabled)
[    1.573762][   T27] audit: type=2000 audit(1708826992.525:1): state=initialized audit_enabled=0 res=1
[    1.589225][    T1] thermal_sys: Registered thermal governor 'step_wise'
[    1.589289][    T1] thermal_sys: Registered thermal governor 'user_space'
[    1.591526][    T1] cpuidle: using governor menu
[    1.594184][    T1] NET: Registered PF_QIPCRTR protocol family
[    1.609953][    T1] dca service started, version 1.12.1
[    1.610033][    T1] PCI: Using configuration type 1 for base access
[    1.637050][    T1] HugeTLB: registered 1.00 GiB page size, pre-allocated 0 pages
[    1.640047][    T1] HugeTLB: 0 KiB vmemmap can be freed for a 1.00 GiB page
[    1.642925][    T1] HugeTLB: registered 2.00 MiB page size, pre-allocated 0 pages
[    1.643291][    T1] HugeTLB: 0 KiB vmemmap can be freed for a 2.00 MiB page
[    1.693336][    T1] raid6: skipped pq benchmark and selected avx2x4
[    1.693336][    T1] raid6: using avx2x2 recovery algorithm
[    1.697685][    T1] ACPI: Added _OSI(Module Device)
[    1.700031][    T1] ACPI: Added _OSI(Processor Device)
[    1.703277][    T1] ACPI: Added _OSI(3.0 _SCP Extensions)
[    1.705648][    T1] ACPI: Added _OSI(Processor Aggregator Device)
[    2.205354][    T1] ACPI: 2 ACPI AML tables successfully acquired and loaded
[    2.299980][    T1] ACPI: _OSC evaluation for CPUs failed, trying _PDC
[    2.362337][    T1] ACPI: Interpreter enabled
[    2.364750][    T1] ACPI: PM: (supports S0 S3 S4 S5)
[    2.365761][    T1] ACPI: Using IOAPIC for interrupt routing
[    2.368508][    T1] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
[    2.371280][    T1] PCI: Ignoring E820 reservations for host bridge windows
[    2.390515][    T1] ACPI: Enabled 16 GPEs in block 00 to 0F
[    3.115531][    T1] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
[    3.117418][    T1] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI HPX-Type3]
[    3.119220][    T1] acpi PNP0A03:00: _OSC: not requesting OS control; OS requires [ExtendedConfig ASPM ClockPM MSI]
[    3.123713][    T1] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended configuration space under this bridge
[    3.193294][    T1] PCI host bridge to bus 0000:00
[    3.193294][    T1] pci_bus 0000:00: Unknown NUMA node; performance will be reduced
[    3.194712][    T1] pci_bus 0000:00: root bus resource [io  0x0000-0x0cf7 window]
[    3.196205][    T1] pci_bus 0000:00: root bus resource [io  0x0d00-0xffff window]
[    3.197730][    T1] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
[    3.199394][    T1] pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfefff window]
[    3.200955][    T1] pci_bus 0000:00: root bus resource [bus 00-ff]
[    3.204545][    T1] pci 0000:00:00.0: [8086:1237] type 00 class 0x060000 conventional PCI endpoint
[    3.216364][    T1] pci 0000:00:01.0: [8086:7110] type 00 class 0x060100 conventional PCI endpoint
[    3.259076][    T1] pci 0000:00:01.3: [8086:7113] type 00 class 0x068000 conventional PCI endpoint
[    3.289965][    T1] pci 0000:00:01.3: quirk: [io  0xb000-0xb03f] claimed by PIIX4 ACPI
[    3.303975][    T1] pci 0000:00:03.0: [1af4:1004] type 00 class 0x000000 conventional PCI endpoint
[    3.316498][    T1] pci 0000:00:03.0: BAR 0 [io  0xc000-0xc03f]
[    3.324669][    T1] pci 0000:00:03.0: BAR 1 [mem 0xfe800000-0xfe80007f]
[    3.358364][    T1] pci 0000:00:04.0: [1af4:1000] type 00 class 0x020000 conventional PCI endpoint
[    3.374736][    T1] pci 0000:00:04.0: BAR 0 [io  0xc040-0xc07f]
[    3.383283][    T1] pci 0000:00:04.0: BAR 1 [mem 0xfe801000-0xfe80107f]
[    3.419323][    T1] pci 0000:00:05.0: [1ae0:a002] type 00 class 0x030000 conventional PCI endpoint
[    3.437913][    T1] pci 0000:00:05.0: BAR 0 [mem 0xfe000000-0xfe7fffff]
[    3.476881][    T1] pci 0000:00:05.0: Video device with shadowed ROM at [mem 0x000c0000-0x000dffff]
[    3.495064][    T1] pci 0000:00:06.0: [1af4:1002] type 00 class 0x00ff00 conventional PCI endpoint
[    3.509218][    T1] pci 0000:00:06.0: BAR 0 [io  0xc080-0xc09f]
[    3.518528][    T1] pci 0000:00:06.0: BAR 1 [mem 0xfe802000-0xfe80207f]
[    3.557251][    T1] pci 0000:00:07.0: [1af4:1005] type 00 class 0x00ff00 conventional PCI endpoint
[    3.569662][    T1] pci 0000:00:07.0: BAR 0 [io  0xc0a0-0xc0bf]
[    3.578093][    T1] pci 0000:00:07.0: BAR 1 [mem 0xfe803000-0xfe80303f]
[    3.723845][    T1] ACPI: PCI: Interrupt link LNKA configured for IRQ 10
[    3.748176][    T1] ACPI: PCI: Interrupt link LNKB configured for IRQ 10
[    3.771042][    T1] ACPI: PCI: Interrupt link LNKC configured for IRQ 11
[    3.793854][    T1] ACPI: PCI: Interrupt link LNKD configured for IRQ 11
[    3.805804][    T1] ACPI: PCI: Interrupt link LNKS configured for IRQ 9
[    3.874360][    T1] iommu: Default domain type: Translated
[    3.874835][    T1] iommu: DMA domain TLB invalidation policy: lazy mode
[    3.890314][    T1] =====================================================
[    3.890556][    T1] BUG: KMSAN: uninit-value in __list_del_entry_valid_or_report+0x19e/0x490
[    3.890717][    T1]  __list_del_entry_valid_or_report+0x19e/0x490
[    3.890868][    T1]  stack_depot_save_flags+0x3e7/0x7b0
[    3.890973][    T1]  stack_depot_save+0x12/0x20
[    3.891068][    T1]  ref_tracker_alloc+0x215/0x700
[    3.891170][    T1]  sk_alloc+0x7b4/0x850
[    3.891271][    T1]  __netlink_kernel_create+0x1ec/0xe50
[    3.891398][    T1]  scsi_netlink_init+0x6f/0x140
[    3.891505][    T1]  init_scsi+0x1dc/0x300
[    3.891593][    T1]  do_one_initcall+0x216/0x960
[    3.891705][    T1]  do_initcall_level+0x140/0x350
[    3.891814][    T1]  do_initcalls+0xf0/0x1d0
[    3.891913][    T1]  do_basic_setup+0x22/0x30
[    3.892013][    T1]  kernel_init_freeable+0x300/0x4b0
[    3.892122][    T1]  kernel_init+0x2f/0x7e0
[    3.892241][    T1]  ret_from_fork+0x66/0x80
[    3.892364][    T1]  ret_from_fork_asm+0x11/0x20
[    3.892477][    T1] 
[    3.892491][    T1] Uninit was created at:
[    3.892629][    T1]  __alloc_pages+0x9a4/0xe00
[    3.892712][    T1]  alloc_pages_mpol+0x62b/0x9d0
[    3.892806][    T1]  alloc_pages+0x1be/0x1e0
[    3.892895][    T1]  stack_depot_save_flags+0x73a/0x7b0
[    3.892999][    T1]  stack_depot_save+0x12/0x20
[    3.893094][    T1]  ref_tracker_alloc+0x215/0x700
[    3.893196][    T1]  sk_alloc+0x7b4/0x850
[    3.893197][    T1]  __netlink_kernel_create+0x1ec/0xe50
[    3.893197][    T1]  cn_init+0x6f/0x280
[    3.893197][    T1]  do_one_initcall+0x216/0x960
[    3.893197][    T1]  do_initcall_level+0x140/0x350
[    3.893197][    T1]  do_initcalls+0xf0/0x1d0
[    3.893197][    T1]  do_basic_setup+0x22/0x30
[    3.893197][    T1]  kernel_init_freeable+0x300/0x4b0
[    3.893197][    T1]  kernel_init+0x2f/0x7e0
[    3.893197][    T1]  ret_from_fork+0x66/0x80
[    3.893197][    T1]  ret_from_fork_asm+0x11/0x20
[    3.893197][    T1] 
[    3.893197][    T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc5-syzkaller-00329-gab0a97cffa0b-dirty #0
[    3.893197][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
[    3.893197][    T1] =====================================================
[    3.893197][    T1] Disabling lock debugging due to kernel taint
[    3.893197][    T1] Kernel panic - not syncing: kmsan.panic set ...
[    3.893197][    T1] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G    B              6.8.0-rc5-syzkaller-00329-gab0a97cffa0b-dirty #0
[    3.893197][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
[    3.893197][    T1] Call Trace:
[    3.893197][    T1]  <TASK>
[    3.893197][    T1]  dump_stack_lvl+0x1bf/0x240
[    3.893197][    T1]  dump_stack+0x1e/0x20
[    3.893197][    T1]  panic+0x4de/0xc90
[    3.893197][    T1]  kmsan_report+0x2d0/0x2d0
[    3.893197][    T1]  ? kmsan_metadata_is_contiguous+0x66/0x1e0
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? __msan_warning+0x96/0x110
[    3.893197][    T1]  ? __list_del_entry_valid_or_report+0x19e/0x490
[    3.893197][    T1]  ? stack_depot_save_flags+0x3e7/0x7b0
[    3.893197][    T1]  ? stack_depot_save+0x12/0x20
[    3.893197][    T1]  ? ref_tracker_alloc+0x215/0x700
[    3.893197][    T1]  ? sk_alloc+0x7b4/0x850
[    3.893197][    T1]  ? __netlink_kernel_create+0x1ec/0xe50
[    3.893197][    T1]  ? scsi_netlink_init+0x6f/0x140
[    3.893197][    T1]  ? init_scsi+0x1dc/0x300
[    3.893197][    T1]  ? do_one_initcall+0x216/0x960
[    3.893197][    T1]  ? do_initcall_level+0x140/0x350
[    3.893197][    T1]  ? do_initcalls+0xf0/0x1d0
[    3.893197][    T1]  ? do_basic_setup+0x22/0x30
[    3.893197][    T1]  ? kernel_init_freeable+0x300/0x4b0
[    3.893197][    T1]  ? kernel_init+0x2f/0x7e0
[    3.893197][    T1]  ? ret_from_fork+0x66/0x80
[    3.893197][    T1]  ? ret_from_fork_asm+0x11/0x20
[    3.893197][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[    3.893197][    T1]  ? _raw_spin_lock_irqsave+0x35/0xc0
[    3.893197][    T1]  ? filter_irq_stacks+0x60/0x1a0
[    3.893197][    T1]  ? stack_depot_save_flags+0x2c/0x7b0
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[    3.893197][    T1]  __msan_warning+0x96/0x110
[    3.893197][    T1]  __list_del_entry_valid_or_report+0x19e/0x490
[    3.893197][    T1]  stack_depot_save_flags+0x3e7/0x7b0
[    3.893197][    T1]  stack_depot_save+0x12/0x20
[    3.893197][    T1]  ref_tracker_alloc+0x215/0x700
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? sk_alloc+0x7b4/0x850
[    3.893197][    T1]  ? __netlink_kernel_create+0x1ec/0xe50
[    3.893197][    T1]  ? scsi_netlink_init+0x6f/0x140
[    3.893197][    T1]  ? init_scsi+0x1dc/0x300
[    3.893197][    T1]  ? do_one_initcall+0x216/0x960
[    3.893197][    T1]  ? do_initcall_level+0x140/0x350
[    3.893197][    T1]  ? do_initcalls+0xf0/0x1d0
[    3.893197][    T1]  ? do_basic_setup+0x22/0x30
[    3.893197][    T1]  ? kernel_init_freeable+0x300/0x4b0
[    3.893197][    T1]  ? kernel_init+0x2f/0x7e0
[    3.893197][    T1]  ? ret_from_fork+0x66/0x80
[    3.893197][    T1]  ? ret_from_fork_asm+0x11/0x20
[    3.893197][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[    3.893197][    T1]  sk_alloc+0x7b4/0x850
[    3.893197][    T1]  __netlink_kernel_create+0x1ec/0xe50
[    3.893197][    T1]  ? kmsan_internal_memmove_metadata+0x91/0x220
[    3.893197][    T1]  scsi_netlink_init+0x6f/0x140
[    3.893197][    T1]  ? scsi_netlink_init+0x140/0x140
[    3.893197][    T1]  init_scsi+0x1dc/0x300
[    3.893197][    T1]  ? udmabuf_dev_init+0x2a0/0x2a0
[    3.893197][    T1]  do_one_initcall+0x216/0x960
[    3.893197][    T1]  ? udmabuf_dev_init+0x2a0/0x2a0
[    3.893197][    T1]  ? kmsan_get_metadata+0x80/0x1c0
[    3.893197][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[    3.893197][    T1]  ? filter_irq_stacks+0x164/0x1a0
[    3.893197][    T1]  ? stack_depot_save_flags+0x2c/0x7b0
[    3.893197][    T1]  ? skip_spaces+0x8f/0xc0
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[    3.893197][    T1]  ? parse_args+0x1511/0x15e0
[    3.893197][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[    3.893197][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[    3.893197][    T1]  ? udmabuf_dev_init+0x2a0/0x2a0
[    3.893197][    T1]  do_initcall_level+0x140/0x350
[    3.893197][    T1]  do_initcalls+0xf0/0x1d0
[    3.893197][    T1]  ? arch_cpuhp_init_parallel_bringup+0xe0/0xe0
[    3.893197][    T1]  do_basic_setup+0x22/0x30
[    3.893197][    T1]  kernel_init_freeable+0x300/0x4b0
[    3.893197][    T1]  ? rest_init+0x260/0x260
[    3.893197][    T1]  kernel_init+0x2f/0x7e0
[    3.893197][    T1]  ? rest_init+0x260/0x260
[    3.893197][    T1]  ret_from_fork+0x66/0x80
[    3.893197][    T1]  ? rest_init+0x260/0x260
[    3.893197][    T1]  ret_from_fork_asm+0x11/0x20
[    3.893197][    T1]  </TASK>


syzkaller build log:
go env (err=<nil>)
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.4'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3486373933=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at 9bd8dcda8
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:32: run command via tools/syz-env for best compatibility, see:
Makefile:33: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=9bd8dcda8c7c494d59bd3132a668f4784ea835c6 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240119-142441'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=9bd8dcda8c7c494d59bd3132a668f4784ea835c6 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240119-142441'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=9bd8dcda8c7c494d59bd3132a668f4784ea835c6 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240119-142441'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"9bd8dcda8c7c494d59bd3132a668f4784ea835c6\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=147e9a30180000


Tested on:

commit:         ab0a97cf Merge tag 'powerpc-6.8-4' of git://git.kernel..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=d33318d4e4a0d226
dashboard link: https://syzkaller.appspot.com/bug?extid=d7521c1e3841ed075a42
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=126caac4180000