Re: [syzbot] [block?] general protection fault in blk_mq_quiesce_queue

[syzbot <syzbot+fefa0af09f7891b1800e@syzkaller.appspotmail.com>]

Hello,

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

SYZFAIL: failed to recv rpc

SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
execution of simple program fails: NOTFAIL: arptable checkpoint: getsockopt(ARPT_SO_GET_ENTRIES) failed. table=filter (errno 22: Invalid argument).


qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than the requested size (0x301000)
[   41.844215][ T1129] ata1.00: Read log 0x10 page 0x00 failed, Emask 0x1
[   41.844240][ T1129] qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than the requested size (0x400000)
ata1: failed to read log page 10h (errno=-5)
[   41.844257][ T1129] ata1.00: exception Emask 0x1 SAct 0x40000001 SErr 0x0 action 0x0
[   41.844276][ T1129] ata1.00: irq_stat 0x40000000
[   41.844292][ T1129] ata1.00: failed command: WRITE FPDMA QUEUED
[   41.844304][ T1129] ata1.00: cmd 61/10:00:3e:99:04/0f:00:00:00:00/40 tag 0 ncq dma 1974272 ou
[   41.844304][ T1129]          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[   41.844356][ T1129] ata1.00: status: { DRDY }
[   41.844375][ T1129] ata1.00: failed command: WRITE FPDMA QUEUED
[   41.844385][ T1129] ata1.00: cmd 61/08:f0:36:81:04/18:00:00:00:00/40 tag 30 ncq dma 3149824 ou
[   41.844385][ T1129]          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[   41.844439][ T1129] ata1.00: status: { DRDY }
[   41.845428][ T1129] ata1.00: configured for UDMA/100
[   41.846224][ T1129] ata1: EH complete
[   71.003538][  T856] cfg80211: failed to load regulatory.db
[   72.321505][ T1129] ata1.00: exception Emask 0x0 SAct 0x40000000 SErr 0x0 action 0x6 frozen
[   72.321540][ T1129] ata1.00: failed command: WRITE FPDMA QUEUED
[   72.321551][ T1129] ata1.00: cmd 61/00:f0:36:21:05/20:00:00:00:00/40 tag 30 ncq dma 4194304 ou
[   72.321551][ T1129]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[   72.321601][ T1129] ata1.00: status: { DRDY }
[   72.321649][ T1129] ata1: hard resetting link
[   72.646494][ T1129] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   72.647439][ T1129] ata1.00: configured for UDMA/100
[   72.647691][ T1129] ata1: EH complete
Warning: Permanently added '[localhost]:31181' (ED25519) to the list of known hosts.
2026/11/10 19:31:24 parsed 1 programs
2026/11/10 19:31:24 serving rpc on tcp://46365
[   79.004885][ T5750] cgroup: Unknown subsys name 'net'
[   79.134080][ T5750] cgroup: Unknown subsys name 'cpuset'
[   79.139134][ T5750] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   80.470828][ T5750] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[   82.853082][ T5760] soft_limit_in_bytes is deprecated and will be removed. Writing any value to this file has no effect. Please report your usecase to linux-mm@kvack.org if you depend on this functionality.
[   82.870654][ T5760] ebtables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   82.879298][ T5760] arp_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   83.020826][ T5773] br_netfilter no longer supported in user namespaces
[   83.154564][ T5773] ip_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   83.154852][ T5773] ip6_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   83.780501][   T68] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   83.780523][   T68] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   83.875702][   T68] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   83.875718][   T68] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   84.091124][ T5832] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   84.092413][ T5832] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   84.092833][ T5832] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   84.093874][ T5832] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   84.094321][ T5832] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   84.121156][ T5780] bridge0: port 1(bridge_slave_0) entered blocking state
[   84.122077][ T5780] bridge0: port 1(bridge_slave_0) entered disabled state
[   84.122180][ T5780] bridge_slave_0: entered allmulticast mode
[   84.123151][ T5780] bridge_slave_0: entered promiscuous mode
[   84.141075][ T5780] bridge0: port 2(bridge_slave_1) entered blocking state
[   84.141171][ T5780] bridge0: port 2(bridge_slave_1) entered disabled state
[   84.141612][ T5780] bridge_slave_1: entered allmulticast mode
[   84.142798][ T5780] bridge_slave_1: entered promiscuous mode
[   84.215418][ T5780] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   84.221957][ T5780] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   84.248965][ T5780] team0: Port device team_slave_0 added
[   84.254455][ T5780] team0: Port device team_slave_1 added
[   84.280176][ T5780] batman_adv: batadv0: Adding interface: batadv_slave_0
[   84.280193][ T5780] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[   84.280214][ T5780] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   84.284994][ T5780] batman_adv: batadv0: Adding interface: batadv_slave_1
[   84.285014][ T5780] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[   84.285035][ T5780] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   84.423649][ T5780] hsr_slave_0: entered promiscuous mode
[   84.426706][ T5780] hsr_slave_1: entered promiscuous mode
[   84.684141][ T5780] netdevsim netdevsim6 netdevsim0: renamed from eth0
[   84.689820][ T5780] 8021q: adding VLAN 0 to HW filter on device netdevsim0
[   84.690609][ T5780] netdevsim netdevsim6 netdevsim1: renamed from eth1
[   84.694534][ T5780] 8021q: adding VLAN 0 to HW filter on device netdevsim1
[   84.695342][ T5780] netdevsim netdevsim6 netdevsim2: renamed from eth2
[   84.699510][ T5780] 8021q: adding VLAN 0 to HW filter on device netdevsim2
[   84.700415][ T5780] netdevsim netdevsim6 netdevsim3: renamed from eth3
[   84.702833][ T5780] 8021q: adding VLAN 0 to HW filter on device netdevsim3
[   84.826990][ T5780] 8021q: adding VLAN 0 to HW filter on device bond0
[   84.846339][ T5780] 8021q: adding VLAN 0 to HW filter on device team0
[   84.852806][   T38] bridge0: port 1(bridge_slave_0) entered blocking state
[   84.853180][   T38] bridge0: port 1(bridge_slave_0) entered forwarding state
[   84.862643][   T38] bridge0: port 2(bridge_slave_1) entered blocking state
[   84.862698][   T38] bridge0: port 2(bridge_slave_1) entered forwarding state
[   85.186557][ T5780] 8021q: adding VLAN 0 to HW filter on device batadv0
[   85.383527][ T5780] veth0_vlan: entered promiscuous mode
[   85.390385][ T5780] veth1_vlan: entered promiscuous mode
[   85.415572][ T5780] veth0_macvtap: entered promiscuous mode
[   85.419971][ T5780] veth1_macvtap: entered promiscuous mode
[   85.430797][ T5780] batman_adv: batadv0: Interface activated: batadv_slave_0
[   85.437743][ T5780] batman_adv: batadv0: Interface activated: batadv_slave_1
[   85.491628][   T14] netdevsim netdevsim6 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   85.521992][   T14] netdevsim netdevsim6 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   85.522034][   T14] netdevsim netdevsim6 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   85.522064][   T14] netdevsim netdevsim6 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   85.558282][ T5812] netdevsim netdevsim6 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
execution of simple program fails: NOTFAIL: arptable checkpoint: getsockopt(ARPT_SO_GET_ENTRIES) failed. table=filter (errno 22: Invalid argument).
[   85.635294][ T5812] netdevsim netdevsim6 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   85.696264][ T5812] netdevsim netdevsim6 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   85.841148][ T5812] netdevsim netdevsim6 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   87.595495][ T5812] bridge_slave_1: left allmulticast mode
[   87.595530][ T5812] bridge_slave_1: left promiscuous mode
[   87.596427][ T5812] bridge0: port 2(bridge_slave_1) entered disabled state
[   87.599943][ T5812] bridge_slave_0: left allmulticast mode
[   87.599965][ T5812] bridge_slave_0: left promiscuous mode
[   87.600143][ T5812] bridge0: port 1(bridge_slave_0) entered disabled state
[   87.708233][ T5812] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   87.710902][ T5812] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   87.714475][ T5812] bond0 (unregistering): Released all slaves
[   87.787731][ T5812] hsr_slave_0: left promiscuous mode
[   87.788517][ T5812] hsr_slave_1: left promiscuous mode
[   87.789254][ T5812] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   87.789275][ T5812] batman_adv: batadv0: Removing interface: batadv_slave_0
[   87.790212][ T5812] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   87.790222][ T5812] batman_adv: batadv0: Removing interface: batadv_slave_1
[   87.798747][ T5812] veth1_macvtap: left promiscuous mode
[   87.798783][ T5812] veth0_macvtap: left promiscuous mode
[   87.798830][ T5812] veth1_vlan: left promiscuous mode
[   87.798867][ T5812] veth0_vlan: left promiscuous mode
[   87.974363][ T5812] team0 (unregistering): Port device team_slave_1 removed
[   87.979464][ T5812] team0 (unregistering): Port device team_slave_0 removed
[   88.038058][ T5445] 8021q: adding VLAN 0 to HW filter on device eth2
[   88.225642][ T5445] 8021q: adding VLAN 0 to HW filter on device eth3
[   88.407846][ T5445] 8021q: adding VLAN 0 to HW filter on device eth5
[   88.609210][ T5445] 8021q: adding VLAN 0 to HW filter on device eth4


syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1302820052=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at d2e5fb956a
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}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d2e5fb956ad222b37a913979e04dc012f4868836 -X github.com/google/syzkaller/prog.gitRevisionDate=20260903-102143"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d2e5fb956ad222b37a913979e04dc012f4868836 -X github.com/google/syzkaller/prog.gitRevisionDate=20260903-102143"  ./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=d2e5fb956ad222b37a913979e04dc012f4868836 -X github.com/google/syzkaller/prog.gitRevisionDate=20260903-102143"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_386
x86_64-linux-gnu-g++ -o ./bin/linux_386/syz-executor executor/executor.cc \
	-m32 -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 -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_386=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d2e5fb956ad222b37a913979e04dc012f4868836\"
/usr/bin/ld: /tmp/ccGyTJVs.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x145): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null
[INFO] Unsupported architecture '386', skipping check.



Tested on:

commit:         067c5c24 Merge tag 'page_alloc-for-7.4-rc2' of git://g..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=c40cb9cd7a4b919a
dashboard link: https://syzkaller.appspot.com/bug?extid=fefa0af09f7891b1800e
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15e43369580000