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).


Warning: Permanently added '[localhost]:55209' (ED25519) to the list of known hosts.
2026/11/10 19:43:45 parsed 1 programs
2026/11/10 19:43:45 serving rpc on tcp://44245
[   46.806227][ T5734] cgroup: Unknown subsys name 'net'
[   46.893911][ T5734] cgroup: Unknown subsys name 'cpuset'
[   46.897550][ T5734] cgroup: Unknown subsys name 'rlimit'
qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than the requested size (0x400000)
qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than the requested size (0x400000)
[   47.058702][ T1130] ata1.00: Read log 0x10 page 0x00 failed, Emask 0x1
[   47.058717][ T1130] ata1: failed to read log page 10h (errno=-5)
[   47.058729][ T1130] ata1.00: exception Emask 0x1 SAct 0x380 SErr 0x0 action 0x0
[   47.058739][ T1130] ata1.00: irq_stat 0x41000000
[   47.058751][ T1130] ata1.00: failed command: WRITE FPDMA QUEUED
[   47.058757][ T1130] ata1.00: cmd 61/00:38:36:81:05/20:00:00:00:00/40 tag 7 ncq dma 4194304 ou
[   47.058757][ T1130]          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[   47.058788][ T1130] ata1.00: status: { DRDY }
[   47.058797][ T1130] ata1.00: failed command: WRITE FPDMA QUEUED
[   47.058803][ T1130] ata1.00: cmd 61/00:40:36:a1:05/20:00:00:00:00/40 tag 8 ncq dma 4194304 ou
[   47.058803][ T1130]          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[   47.058833][ T1130] ata1.00: status: { DRDY }
[   47.058842][ T1130] ata1.00: failed command: WRITE FPDMA QUEUED
[   47.058848][ T1130] ata1.00: cmd 61/c8:48:36:c1:05/0f:00:00:00:00/40 tag 9 ncq dma 2068480 ou
[   47.058848][ T1130]          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[   47.058878][ T1130] ata1.00: status: { DRDY }
[   47.059522][ T1130] ata1.00: configured for UDMA/100
[   47.060364][ T1130] ata1: EH complete
[   71.140054][ T1442] ieee802154 phy0 wpan0: encryption failed: -22
[   71.140114][ T1442] ieee802154 phy1 wpan1: encryption failed: -22
[   76.260682][ T2395] cfg80211: failed to load regulatory.db
[   77.598236][ T1130] ata1.00: NCQ disabled due to excessive errors
[   77.598250][ T1130] ata1.00: exception Emask 0x0 SAct 0x40000 SErr 0x0 action 0x6 frozen
[   77.598265][ T1130] ata1.00: failed command: WRITE FPDMA QUEUED
[   77.598272][ T1130] ata1.00: cmd 61/00:90:36:a1:05/20:00:00:00:00/40 tag 18 ncq dma 4194304 ou
[   77.598272][ T1130]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[   77.598303][ T1130] ata1.00: status: { DRDY }
[   77.598338][ T1130] ata1: hard resetting link
[   77.923282][ T1130] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   77.924116][ T1130] ata1.00: configured for UDMA/100
[   77.924338][ T1130] ata1: EH complete
Setting up swapspace version 1, size = 127995904 bytes
[   78.684000][ T5734] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[   80.705164][ T5753] 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.
[   80.743728][ T5753] ebtables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   80.745528][   T38] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   80.745540][   T38] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   80.761605][ T5753] arp_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   80.826474][ T1169] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   80.826488][ T1169] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   81.255232][ T5783] br_netfilter no longer supported in user namespaces
[   81.421318][ T5783] ip_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   81.421570][ T5783] ip6_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   81.619224][ T5815] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   81.620095][ T5815] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   81.620778][ T5815] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   81.621504][ T5815] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   81.621954][ T5815] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   82.036534][ T5784] bridge0: port 1(bridge_slave_0) entered blocking state
[   82.037138][ T5784] bridge0: port 1(bridge_slave_0) entered disabled state
[   82.037206][ T5784] bridge_slave_0: entered allmulticast mode
[   82.038224][ T5784] bridge_slave_0: entered promiscuous mode
[   82.041159][ T5784] bridge0: port 2(bridge_slave_1) entered blocking state
[   82.041225][ T5784] bridge0: port 2(bridge_slave_1) entered disabled state
[   82.041283][ T5784] bridge_slave_1: entered allmulticast mode
[   82.042083][ T5784] bridge_slave_1: entered promiscuous mode
[   82.056544][ T5784] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   82.057858][ T5784] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   82.071287][ T5784] team0: Port device team_slave_0 added
[   82.072573][ T5784] team0: Port device team_slave_1 added
[   82.083563][ T5784] batman_adv: batadv0: Adding interface: batadv_slave_0
[   82.083574][ T5784] 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.
[   82.083588][ T5784] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   82.085206][ T5784] batman_adv: batadv0: Adding interface: batadv_slave_1
[   82.085215][ T5784] 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.
[   82.085229][ T5784] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   82.116630][ T5784] hsr_slave_0: entered promiscuous mode
[   82.117141][ T5784] hsr_slave_1: entered promiscuous mode
[   82.369913][ T5784] netdevsim netdevsim9 netdevsim0: renamed from eth0
[   82.376209][ T5784] 8021q: adding VLAN 0 to HW filter on device netdevsim0
[   82.377262][ T5784] netdevsim netdevsim9 netdevsim1: renamed from eth1
[   82.380116][ T5784] 8021q: adding VLAN 0 to HW filter on device netdevsim1
[   82.380866][ T5784] netdevsim netdevsim9 netdevsim2: renamed from eth2
[   82.386962][ T5784] 8021q: adding VLAN 0 to HW filter on device netdevsim2
[   82.388402][ T5784] netdevsim netdevsim9 netdevsim3: renamed from eth3
[   82.391729][ T5784] 8021q: adding VLAN 0 to HW filter on device netdevsim3
[   82.416527][ T5784] bridge0: port 2(bridge_slave_1) entered blocking state
[   82.416645][ T5784] bridge0: port 2(bridge_slave_1) entered forwarding state
[   82.417096][ T5784] bridge0: port 1(bridge_slave_0) entered blocking state
[   82.417193][ T5784] bridge0: port 1(bridge_slave_0) entered forwarding state
[   82.469095][ T5784] 8021q: adding VLAN 0 to HW filter on device bond0
[   82.484256][   T63] bridge0: port 1(bridge_slave_0) entered disabled state
[   82.485301][   T63] bridge0: port 2(bridge_slave_1) entered disabled state
[   82.502895][ T5784] 8021q: adding VLAN 0 to HW filter on device team0
[   82.507456][   T63] bridge0: port 1(bridge_slave_0) entered blocking state
[   82.507546][   T63] bridge0: port 1(bridge_slave_0) entered forwarding state
[   82.515219][   T63] bridge0: port 2(bridge_slave_1) entered blocking state
[   82.515287][   T63] bridge0: port 2(bridge_slave_1) entered forwarding state
[   82.794103][ T5784] 8021q: adding VLAN 0 to HW filter on device batadv0
[   82.944564][ T5784] veth0_vlan: entered promiscuous mode
[   82.948109][ T5784] veth1_vlan: entered promiscuous mode
[   82.962868][ T5784] veth0_macvtap: entered promiscuous mode
[   82.965747][ T5784] veth1_macvtap: entered promiscuous mode
[   82.973689][ T5784] batman_adv: batadv0: Interface activated: batadv_slave_0
[   82.978359][ T5784] batman_adv: batadv0: Interface activated: batadv_slave_1
[   83.028783][   T14] netdevsim netdevsim9 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   83.029066][   T14] netdevsim netdevsim9 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   83.029087][   T14] netdevsim netdevsim9 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   83.029105][   T14] netdevsim netdevsim9 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   83.066068][   T13] netdevsim netdevsim9 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).
[   83.164702][   T13] netdevsim netdevsim9 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   83.258043][   T13] netdevsim netdevsim9 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   83.319660][   T13] netdevsim netdevsim9 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   84.441016][   T13] bridge_slave_1: left allmulticast mode
[   84.441041][   T13] bridge_slave_1: left promiscuous mode
[   84.441512][   T13] bridge0: port 2(bridge_slave_1) entered disabled state
[   84.444540][   T13] bridge_slave_0: left allmulticast mode
[   84.444553][   T13] bridge_slave_0: left promiscuous mode
[   84.444976][   T13] bridge0: port 1(bridge_slave_0) entered disabled state
[   84.541766][   T13] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   84.546845][   T13] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   84.548305][   T13] bond0 (unregistering): Released all slaves
[   84.613074][   T13] hsr_slave_0: left promiscuous mode
[   84.613487][   T13] hsr_slave_1: left promiscuous mode
[   84.613915][   T13] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   84.613931][   T13] batman_adv: batadv0: Removing interface: batadv_slave_0
[   84.614532][   T13] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   84.614542][   T13] batman_adv: batadv0: Removing interface: batadv_slave_1
[   84.618239][   T13] veth1_macvtap: left promiscuous mode
[   84.618278][   T13] veth0_macvtap: left promiscuous mode
[   84.618325][   T13] veth1_vlan: left promiscuous mode
[   84.618363][   T13] veth0_vlan: left promiscuous mode
[   84.755242][   T13] team0 (unregistering): Port device team_slave_1 removed
[   84.765279][   T13] team0 (unregistering): Port device team_slave_0 removed
[   84.829397][ T5441] 8021q: adding VLAN 0 to HW filter on device eth2
[   84.996382][ T5441] 8021q: adding VLAN 0 to HW filter on device eth3
[   85.136235][ T5441] 8021q: adding VLAN 0 to HW filter on device eth4
[   85.264192][ T5441] 8021q: adding VLAN 0 to HW filter on device eth5


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-build1399445064=/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/cclh0b8o.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=166c044d580000