Re: [syzbot] [net?] [nfc?] KMSAN: uninit-value in nci_rx_work

[syzbot <syzbot+d7b4dc6cd50410152534@syzkaller.appspotmail.com>]

Hello,

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

d
[   49.833473][    T1] Key type fscrypt-provisioning registered
[   49.840611][    T1] kAFS: Red Hat AFS client v0.1 registering.
[   49.871444][    T1] Btrfs loaded, assert=on, ref-verify=on, zoned=yes, fsverity=yes
[   49.899097][    T1] Key type encrypted registered
[   49.904196][    T1] AppArmor: AppArmor sha256 policy hashing enabled
[   49.911103][    T1] ima: No TPM chip found, activating TPM-bypass!
[   49.918186][    T1] Loading compiled-in module X.509 certificates
[   49.958925][    T1] Loaded X.509 cert 'Build time autogenerated kernel key: a4798651021c2e94b01e09517f19b030d6efdca0'
[   49.972127][    T1] ima: Allocated hash algorithm: sha256
[   49.978232][    T1] ima: No architecture policies found
[   49.984979][    T1] evm: Initialising EVM extended attributes:
[   49.991015][    T1] evm: security.selinux (disabled)
[   49.996257][    T1] evm: security.SMACK64 (disabled)
[   50.001522][    T1] evm: security.SMACK64EXEC (disabled)
[   50.007098][    T1] evm: security.SMACK64TRANSMUTE (disabled)
[   50.013294][    T1] evm: security.SMACK64MMAP (disabled)
[   50.018826][    T1] evm: security.apparmor
[   50.023190][    T1] evm: security.ima
[   50.027058][    T1] evm: security.capability
[   50.031546][    T1] evm: HMAC attrs: 0x1
[   50.040411][    T1] PM:   Magic number: 8:498:974
[   50.045711][    T1] net rose12: hash matches
[   50.051619][    T1] tty ttyc1: hash matches
[   50.057624][    T1] memory memory21: hash matches
[   50.063084][    T1] printk: legacy console [netcon0] enabled
[   50.069642][    T1] netconsole: network logging started
[   50.076563][    T1] gtp: GTP module loaded (pdp ctx size 128 bytes)
[   50.085358][    T1] rdma_rxe: loaded
[   50.091037][    T1] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[   50.112091][    T1] Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[   50.129871][    T1] Loaded X.509 cert 'wens: 61c038651aabdcf94bd0ac7ff06c7248db18c600'
[   50.138379][    T1] clk: Disabling unused clocks
[   50.143379][    T1] ALSA device list:
[   50.147270][    T1]   #0: Dummy 1
[   50.150844][    T1]   #1: Loopback 1
[   50.154858][    T1]   #2: Virtual MIDI Card 1
[   50.165056][   T10] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[   50.175016][   T10] platform regulatory.0: Falling back to sysfs fallback for: regulatory.db
[   50.187170][    T1] md: Waiting for all devices to be available before autodetect
[   50.195642][    T1] md: If you don't use raid, use raid=noautodetect
[   50.202700][    T1] md: Autodetecting RAID arrays.
[   50.207733][    T1] md: autorun ...
[   50.211457][    T1] md: ... autorun DONE.
[   50.353528][    T1] EXT4-fs (sda1): mounted filesystem 5941fea2-f5fa-4b4e-b5ef-9af118b27b95 ro with ordered data mode. Quota mode: none.
[   50.366915][    T1] VFS: Mounted root (ext4 filesystem) readonly on device 8:1.
[   50.424949][    T1] devtmpfs: mounted
[   50.699460][    T1] Freeing unused kernel image (initmem) memory: 37080K
[   50.711336][    T1] Write protecting the kernel read-only data: 262144k
[   50.758319][    T1] Freeing unused kernel image (rodata/data gap) memory: 1828K
[   52.395352][    T1] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[   52.405685][    T1] x86/mm: Checking user space page tables
[   53.902901][    T1] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[   53.912063][    T1] Failed to set sysctl parameter 'kernel.hung_task_all_cpu_backtrace=1': parameter not found
[   53.933254][    T1] Failed to set sysctl parameter 'max_rcu_stall_to_panic=1': parameter not found
[   53.945343][    T1] Run /sbin/init as init process
[   55.451627][ T4457] mount (4457) used greatest stack depth: 8080 bytes left
[   55.544800][ T4458] EXT4-fs (sda1): re-mounted 5941fea2-f5fa-4b4e-b5ef-9af118b27b95 r/w. Quota mode: none.
mount: mounting smackfs on /sys/fs/smackfs failed: No such file or directory
mount: mounting selinuxfs on /sys/fs/selinux failed: No such file or directory
[   55.887872][ T4461] mount (4461) used greatest stack depth: 5536 bytes left
Starting syslogd: OK
Starting acpid: OK
Starting klogd: OK
Running sysctl: OK
Populating /dev using udev: [   59.736174][ T4491] udevd[4491]: starting version 3.2.11
[   63.326118][ T4492] udevd[4492]: starting eudev-3.2.11
[   63.339616][ T4491] udevd (4491) used greatest stack depth: 5296 bytes left
[   96.282221][ T1217] net_ratelimit: 2 callbacks suppressed
[   96.288457][ T1217] aoe: packet could not be sent on lo.  consider increasing tx_queue_len
[   96.297759][ T1217] aoe: packet could not be sent on bond0.  consider increasing tx_queue_len
[   96.306994][ T1217] aoe: packet could not be sent on dummy0.  consider increasing tx_queue_len
[   96.316324][ T1217] aoe: packet could not be sent on eql.  consider increasing tx_queue_len
[   96.325251][ T1217] aoe: packet could not be sent on ifb0.  consider increasing tx_queue_len
[   96.334334][ T1217] aoe: packet could not be sent on ifb1.  consider increasing tx_queue_len
[   96.343322][ T1217] aoe: packet could not be sent on eth0.  consider increasing tx_queue_len
[   96.352454][ T1217] aoe: packet could not be sent on wlan0.  consider increasing tx_queue_len
[   96.361456][ T1217] aoe: packet could not be sent on wlan1.  consider increasing tx_queue_len
[   96.370791][ T1217] aoe: packet could not be sent on hwsim0.  consider increasing tx_queue_len
done
Starting system message bus: done
Starting iptables: OK
Starting network: OK
Starting dhcpcd...
dhcpcd-9.4.1 starting
dev: loaded udev
DUID 00:04:ee:6e:2e:e3:62:a1:1e:1b:9d:a6:87:1c:6e:7e:27:0f
forked to background, child pid 4705
[  111.221467][ T4706] 8021q: adding VLAN 0 to HW filter on device bond0
[  111.265683][ T4706] eql: remember to turn off Van-Jacobson compression on your slave devices
[  111.628301][   T10] cfg80211: failed to load regulatory.db
Starting sshd: OK


syzkaller

syzkaller login: [  114.143712][    C0] =====================================================
[  114.151005][    C0] BUG: KMSAN: uninit-value in receive_buf+0x25e3/0x5fd0
[  114.158338][    C0]  receive_buf+0x25e3/0x5fd0
[  114.163226][    C0]  virtnet_poll+0xd1c/0x23c0
[  114.168041][    C0]  __napi_poll+0xe7/0x980
[  114.172623][    C0]  net_rx_action+0x82a/0x1850
[  114.177758][    C0]  handle_softirqs+0x1d8/0x810
[  114.182781][    C0]  __irq_exit_rcu+0x68/0x120
[  114.187568][    C0]  irq_exit_rcu+0x12/0x20
[  114.192171][    C0]  common_interrupt+0x94/0xa0
[  114.197187][    C0]  asm_common_interrupt+0x2b/0x40
[  114.202485][    C0]  acpi_safe_halt+0x25/0x30
[  114.207199][    C0]  acpi_idle_do_entry+0x22/0x40
[  114.212502][    C0]  acpi_idle_enter+0xa1/0xc0
[  114.217275][    C0]  cpuidle_enter_state+0xcb/0x250
[  114.222538][    C0]  cpuidle_enter+0x7f/0xf0
[  114.227114][    C0]  do_idle+0x551/0x750
[  114.231384][    C0]  cpu_startup_entry+0x65/0x80
[  114.236432][    C0]  rest_init+0x1e8/0x260
[  114.240862][    C0]  start_kernel+0x927/0xa70
[  114.245558][    C0]  x86_64_start_reservations+0x2e/0x30
[  114.251188][    C0]  x86_64_start_kernel+0x98/0xa0
[  114.257089][    C0]  common_startup_64+0x12c/0x137
[  114.262194][    C0] 
[  114.264659][    C0] Uninit was created at:
[  114.269028][    C0]  __alloc_pages+0x9d6/0xe70
[  114.273784][    C0]  alloc_pages_mpol+0x299/0x990
[  114.278842][    C0]  alloc_pages+0x1bf/0x1e0
[  114.283456][    C0]  skb_page_frag_refill+0x2bf/0x7c0
[  114.288835][    C0]  virtnet_rq_alloc+0x43/0xbb0
[  114.293812][    C0]  try_fill_recv+0x3f0/0x2f50
[  114.298693][    C0]  virtnet_open+0x1cc/0xb00
[  114.303390][    C0]  __dev_open+0x546/0x6f0
[  114.307892][    C0]  __dev_change_flags+0x309/0x9a0
[  114.313123][    C0]  dev_change_flags+0x8e/0x1d0
[  114.318070][    C0]  devinet_ioctl+0x13ec/0x22c0
[  114.323032][    C0]  inet_ioctl+0x4bd/0x6d0
[  114.327536][    C0]  sock_do_ioctl+0xb7/0x540
[  114.332144][    C0]  sock_ioctl+0x727/0xd70
[  114.336671][    C0]  __se_sys_ioctl+0x261/0x450
[  114.341481][    C0]  __x64_sys_ioctl+0x96/0xe0
[  114.346265][    C0]  x64_sys_call+0x1883/0x3b50
[  114.351150][    C0]  do_syscall_64+0xcf/0x1e0
[  114.355849][    C0]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[  114.361963][    C0] 
[  114.364413][    C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.9.0-syzkaller-08544-g4b377b4868ef-dirty #0
[  114.374429][    C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[  114.385301][    C0] =====================================================
[  114.392482][    C0] Disabling lock debugging due to kernel taint
[  114.398789][    C0] Kernel panic - not syncing: kmsan.panic set ...
[  114.405265][    C0] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G    B              6.9.0-syzkaller-08544-g4b377b4868ef-dirty #0
[  114.416655][    C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[  114.426788][    C0] Call Trace:
[  114.430125][    C0]  <IRQ>
[  114.433020][    C0]  dump_stack_lvl+0x216/0x2d0
[  114.437823][    C0]  ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[  114.443852][    C0]  dump_stack+0x1e/0x30
[  114.448123][    C0]  panic+0x4e2/0xcd0
[  114.452123][    C0]  ? kmsan_get_metadata+0x91/0x1d0
[  114.457373][    C0]  kmsan_report+0x2d5/0x2e0
[  114.461994][    C0]  ? kmsan_get_metadata+0x146/0x1d0
[  114.467326][    C0]  ? __msan_warning+0x95/0x120
[  114.472344][    C0]  ? receive_buf+0x25e3/0x5fd0
[  114.477270][    C0]  ? virtnet_poll+0xd1c/0x23c0
[  114.482168][    C0]  ? __napi_poll+0xe7/0x980
[  114.486819][    C0]  ? net_rx_action+0x82a/0x1850
[  114.491807][    C0]  ? handle_softirqs+0x1d8/0x810
[  114.496881][    C0]  ? __irq_exit_rcu+0x68/0x120
[  114.501854][    C0]  ? irq_exit_rcu+0x12/0x20
[  114.506463][    C0]  ? common_interrupt+0x94/0xa0
[  114.511407][    C0]  ? asm_common_interrupt+0x2b/0x40
[  114.516827][    C0]  ? acpi_safe_halt+0x25/0x30
[  114.521642][    C0]  ? acpi_idle_do_entry+0x22/0x40
[  114.526872][    C0]  ? acpi_idle_enter+0xa1/0xc0
[  114.531752][    C0]  ? cpuidle_enter_state+0xcb/0x250
[  114.537063][    C0]  ? cpuidle_enter+0x7f/0xf0
[  114.541755][    C0]  ? do_idle+0x551/0x750
[  114.546289][    C0]  ? cpu_startup_entry+0x65/0x80
[  114.551346][    C0]  ? rest_init+0x1e8/0x260
[  114.555884][    C0]  ? start_kernel+0x927/0xa70
[  114.560670][    C0]  ? x86_64_start_reservations+0x2e/0x30
[  114.566418][    C0]  ? x86_64_start_kernel+0x98/0xa0
[  114.571740][    C0]  ? common_startup_64+0x12c/0x137
[  114.577097][    C0]  ? kmsan_internal_memmove_metadata+0x17b/0x230
[  114.583544][    C0]  ? kmsan_get_metadata+0x146/0x1d0
[  114.588860][    C0]  ? kmsan_get_metadata+0x146/0x1d0
[  114.594216][    C0]  ? page_to_skb+0xdae/0x1620
[  114.599030][    C0]  ? kmsan_get_metadata+0x146/0x1d0
[  114.604348][    C0]  __msan_warning+0x95/0x120
[  114.609032][    C0]  receive_buf+0x25e3/0x5fd0
[  114.613763][    C0]  ? kmsan_get_metadata+0x146/0x1d0
[  114.619119][    C0]  ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[  114.625151][    C0]  virtnet_poll+0xd1c/0x23c0
[  114.629890][    C0]  ? __pfx_virtnet_poll+0x10/0x10
[  114.635162][    C0]  __napi_poll+0xe7/0x980
[  114.639626][    C0]  ? kmsan_get_metadata+0x146/0x1d0
[  114.644985][    C0]  net_rx_action+0x82a/0x1850
[  114.649776][    C0]  ? sched_clock_cpu+0x55/0x870
[  114.654740][    C0]  ? __pfx_net_rx_action+0x10/0x10
[  114.659963][    C0]  handle_softirqs+0x1d8/0x810
[  114.665187][    C0]  __irq_exit_rcu+0x68/0x120
[  114.669904][    C0]  irq_exit_rcu+0x12/0x20
[  114.674347][    C0]  common_interrupt+0x94/0xa0
[  114.679140][    C0]  </IRQ>
[  114.682136][    C0]  <TASK>
[  114.685126][    C0]  asm_common_interrupt+0x2b/0x40
[  114.690296][    C0] RIP: 0010:acpi_safe_halt+0x25/0x30
[  114.695727][    C0] Code: 90 90 90 90 90 55 48 89 e5 65 48 8b 04 25 c0 5c 0a 00 48 f7 00 08 00 00 00 75 10 66 90 0f 00 2d 8b f2 50 00 f3 0f 1e fa fb f4 <fa> 5d c3 cc cc cc cc 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90
[  114.715481][    C0] RSP: 0018:ffffffff91003ce8 EFLAGS: 00000246
[  114.721640][    C0] RAX: ffffffff9102be00 RBX: ffffffff914830f0 RCX: 0000000000000001
[  114.729711][    C0] RDX: ffff888103536464 RSI: ffffffff914830f0 RDI: ffff888103536464
[  114.737788][    C0] RBP: ffffffff91003ce8 R08: ffffea000000000f R09: 00000000000000ff
[  114.745861][    C0] R10: ffff88823f170e02 R11: ffffffff8f8c6600 R12: ffff888104f29800
[  114.755574][    C0] R13: ffffffff91483170 R14: 0000000000000001 R15: 0000000000000001
[  114.763645][    C0]  ? __pfx_acpi_idle_enter+0x10/0x10
[  114.769080][    C0]  acpi_idle_do_entry+0x22/0x40
[  114.774059][    C0]  acpi_idle_enter+0xa1/0xc0
[  114.778766][    C0]  cpuidle_enter_state+0xcb/0x250
[  114.784045][    C0]  cpuidle_enter+0x7f/0xf0
[  114.788595][    C0]  do_idle+0x551/0x750
[  114.792810][    C0]  cpu_startup_entry+0x65/0x80
[  114.797746][    C0]  rest_init+0x1e8/0x260
[  114.802132][    C0]  start_kernel+0x927/0xa70
[  114.806754][    C0]  x86_64_start_reservations+0x2e/0x30
[  114.812354][    C0]  x86_64_start_kernel+0x98/0xa0
[  114.817515][    C0]  common_startup_64+0x12c/0x137
[  114.822596][    C0]  </TASK>
[  114.826121][    C0] Kernel Offset: disabled
[  114.830501][    C0] Rebooting in 86400 seconds..


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-build1133093471=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at 9026e1428
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:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: 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
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=9026e14289eaf45a00ddddb8730f2092b956d99a -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240510-174117'" "-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=9026e14289eaf45a00ddddb8730f2092b956d99a -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240510-174117'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -std=c++11 -I. -Iexecutor/_include -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=\"9026e14289eaf45a00ddddb8730f2092b956d99a\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=1133df6c980000


Tested on:

commit:         4b377b48 kprobe/ftrace: fix build error due to bad fun..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git main
kernel config:  https://syzkaller.appspot.com/x/.config?x=39dc6d181fb71e3a
dashboard link: https://syzkaller.appspot.com/bug?extid=d7b4dc6cd50410152534
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=102cc592980000