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Message-ID: <6901c585.050a0220.32483.0201.GAE@google.com>
Date: Wed, 29 Oct 2025 00:43:01 -0700
From: syzbot <syzbot+77026564530dbc29b854@...kaller.appspotmail.com>
To: dmantipov@...dex.ru, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ocfs2?] UBSAN: array-index-out-of-bounds in ocfs2_block_group_fill
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
] bridge0: port 2(bridge_slave_1) entered disabled state
[ 56.957882][ T6076] 8021q: adding VLAN 0 to HW filter on device bond0
[ 56.968605][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[ 56.976718][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[ 56.985854][ T6076] 8021q: adding VLAN 0 to HW filter on device team0
[ 57.000775][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[ 57.009397][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
[ 57.017915][ T23] bridge0: port 1(bridge_slave_0) entered blocking state
[ 57.024986][ T23] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 57.034664][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[ 57.043651][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
[ 57.052353][ T23] bridge0: port 2(bridge_slave_1) entered blocking state
[ 57.059422][ T23] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 57.069264][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready
[ 57.086208][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready
[ 57.096392][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready
[ 57.105116][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[ 57.113880][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
[ 57.128986][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready
[ 57.137517][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[ 57.148336][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready
[ 57.156564][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
[ 57.167288][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready
[ 57.175546][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
[ 57.185362][ T6076] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
[ 57.245154][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
[ 57.253095][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
[ 57.262418][ T6076] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 57.280281][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready
[ 57.289126][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready
[ 57.310768][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready
[ 57.319606][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready
[ 57.328599][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready
[ 57.336290][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready
[ 57.345386][ T6076] device veth0_vlan entered promiscuous mode
[ 57.356188][ T6076] device veth1_vlan entered promiscuous mode
[ 57.380237][ T6076] device veth0_macvtap entered promiscuous mode
[ 57.388136][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready
[ 57.397218][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready
[ 57.405258][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready
[ 57.414356][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
[ 57.422971][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready
[ 57.434451][ T6076] device veth1_macvtap entered promiscuous mode
[ 57.451925][ T6076] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 57.459716][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready
[ 57.467942][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
[ 57.476921][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
[ 57.487661][ T6076] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 57.497109][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
[ 57.505841][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
[ 57.515082][ T6076] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[ 57.524045][ T6076] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[ 57.532999][ T6076] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[ 57.542687][ T6076] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[ 57.596174][ C1] ================================================================================
[ 57.605482][ C1] UBSAN: signed-integer-overflow in ./arch/x86/include/asm/atomic.h:165:11
[ 57.614205][ C1] 1648931972 + 931318806 cannot be represented in type 'int'
[ 57.621709][ C1] CPU: 1 PID: 5335 Comm: udevd Not tainted syzkaller #0
[ 57.628644][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
[ 57.636275][ T6103] IPVS: ftp: loaded support on port[0] = 21
[ 57.638698][ C1] Call Trace:
[ 57.647934][ C1] <IRQ>
[ 57.650792][ C1] dump_stack+0xfd/0x16e
[ 57.655044][ C1] ubsan_epilogue+0xa/0x30
[ 57.659458][ C1] handle_overflow+0x192/0x1b0
[ 57.664231][ C1] ip_idents_reserve+0x14a/0x170
[ 57.669170][ C1] __ip_select_ident+0xe4/0x1c0
[ 57.674024][ C1] iptunnel_xmit+0x468/0x850
[ 57.678608][ C1] udp_tunnel_xmit_skb+0x1ba/0x290
[ 57.683784][ C1] geneve_xmit+0x1d03/0x2130
[ 57.688362][ C1] dev_hard_start_xmit+0x2a8/0x7f0
[ 57.693468][ C1] __dev_queue_xmit+0x1690/0x2970
[ 57.698490][ C1] ip6_finish_output2+0x101e/0x1490
[ 57.703901][ C1] NF_HOOK+0x45/0x2c0
[ 57.707879][ C1] ? NF_HOOK+0x2c0/0x2c0
[ 57.712114][ C1] mld_sendpack+0x5f7/0xa60
[ 57.716612][ C1] mld_ifc_timer_expire+0x7e1/0x990
[ 57.721953][ C1] ? lock_acquire+0x78/0x330
[ 57.726523][ C1] ? lock_release+0x69/0x640
[ 57.731103][ C1] ? mld_gq_timer_expire+0xe0/0xe0
[ 57.736194][ C1] call_timer_fn+0x103/0x490
[ 57.740767][ C1] ? mld_gq_timer_expire+0xe0/0xe0
[ 57.745873][ C1] __run_timers+0x5d8/0x7a0
[ 57.750375][ C1] run_timer_softirq+0x63/0xf0
[ 57.755140][ C1] __do_softirq+0x267/0x92e
[ 57.759637][ C1] ? asm_call_irq_on_stack+0xf/0x20
[ 57.764814][ C1] asm_call_irq_on_stack+0xf/0x20
[ 57.769809][ C1] </IRQ>
[ 57.772727][ C1] do_softirq_own_stack+0x9b/0xe0
[ 57.777734][ C1] __irq_exit_rcu+0x227/0x230
[ 57.782383][ C1] irq_exit_rcu+0x5/0x20
[ 57.786602][ C1] sysvec_apic_timer_interrupt+0xea/0x100
[ 57.792290][ C1] asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 57.798260][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60
[ 57.804302][ C1] Code: 66 2e 0f 1f 84 00 00 00 00 00 be 0d 00 00 00 48 c7 c7 20 b4 54 8b e8 8f 64 3e 00 c3 cc cc cc cc 00 00 cc cc 00 00 cc cc 00 00 <48> 8b 04 24 65 48 8b 0d 34 d7 90 7e 65 8b 15 39 d7 90 7e f7 c2 00
[ 57.823981][ C1] RSP: 0018:ffffc90000f5fbe8 EFLAGS: 00000287
[ 57.830031][ C1] RAX: ffffffff8354fa11 RBX: ffff8880242ccfda RCX: 0000000000000000
[ 57.837990][ C1] RDX: ffff88802e700000 RSI: 000000000000000e RDI: 000000000000005e
[ 57.845980][ C1] RBP: 000000000000000e R08: 0000000059ee1630 R09: 0000000004ea9dbc
[ 57.854015][ C1] R10: 00000000e66b8ec4 R11: 1ffffffff1964e1d R12: 000000000000002f
[ 57.862094][ C1] R13: 0000000000000023 R14: 0000000000000000 R15: ffff888019809300
[ 57.870056][ C1] ? tomoyo_encode2+0x261/0x480
[ 57.874883][ C1] tomoyo_encode2+0x26c/0x480
[ 57.879536][ C1] tomoyo_realpath_from_path+0x5ce/0x620
[ 57.885172][ C1] tomoyo_path_perm+0x15b/0x450
[ 57.890017][ C1] security_inode_getattr+0xd2/0x130
[ 57.895302][ C1] __x64_sys_newfstat+0xa7/0x160
[ 57.900235][ C1] do_syscall_64+0x34/0x50
[ 57.904801][ C1] entry_SYSCALL_64_after_hwframe+0x67/0xd1
[ 57.910696][ C1] RIP: 0033:0x7f14545d9ad7
[ 57.915097][ C1] Code: 73 01 c3 48 8b 0d 21 f3 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 05 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8
[ 57.934686][ C1] RSP: 002b:00007ffe7f42e5c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000005
[ 57.943080][ C1] RAX: ffffffffffffffda RBX: 000000000000000d RCX: 00007f14545d9ad7
[ 57.951032][ C1] RDX: 0000000000090800 RSI: 00007ffe7f42e5d0 RDI: 000000000000000d
[ 57.958980][ C1] RBP: 00007ffe7f42e5d0 R08: 0000000000000000 R09: 0000000000000001
[ 57.966947][ C1] R10: 0000000000000000 R11: 0000000000000202 R12: 000055a2452227b0
[ 57.974897][ C1] R13: 00000000000000ff R14: 000055a2354e0be0 R15: 00007ffe7f42e8f0
[ 57.982917][ C1] ================================================================================
[ 57.992234][ C1] Kernel panic - not syncing: UBSAN: panic_on_warn set ...
[ 57.999416][ C1] CPU: 1 PID: 5335 Comm: udevd Not tainted syzkaller #0
[ 58.006329][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
[ 58.016454][ C1] Call Trace:
[ 58.019807][ C1] <IRQ>
[ 58.022646][ C1] dump_stack+0xfd/0x16e
[ 58.026862][ C1] panic+0x2f0/0x9c0
[ 58.030733][ C1] check_panic_on_warn+0x95/0xe0
[ 58.035656][ C1] handle_overflow+0x192/0x1b0
[ 58.040394][ C1] ip_idents_reserve+0x14a/0x170
[ 58.045333][ C1] __ip_select_ident+0xe4/0x1c0
[ 58.050526][ C1] iptunnel_xmit+0x468/0x850
[ 58.055096][ C1] udp_tunnel_xmit_skb+0x1ba/0x290
[ 58.060281][ C1] geneve_xmit+0x1d03/0x2130
[ 58.064858][ C1] dev_hard_start_xmit+0x2a8/0x7f0
[ 58.069947][ C1] __dev_queue_xmit+0x1690/0x2970
[ 58.074997][ C1] ip6_finish_output2+0x101e/0x1490
[ 58.080172][ C1] NF_HOOK+0x45/0x2c0
[ 58.084137][ C1] ? NF_HOOK+0x2c0/0x2c0
[ 58.088358][ C1] mld_sendpack+0x5f7/0xa60
[ 58.092843][ C1] mld_ifc_timer_expire+0x7e1/0x990
[ 58.098027][ C1] ? lock_acquire+0x78/0x330
[ 58.102587][ C1] ? lock_release+0x69/0x640
[ 58.107152][ C1] ? mld_gq_timer_expire+0xe0/0xe0
[ 58.112240][ C1] call_timer_fn+0x103/0x490
[ 58.116802][ C1] ? mld_gq_timer_expire+0xe0/0xe0
[ 58.121880][ C1] __run_timers+0x5d8/0x7a0
[ 58.126446][ C1] run_timer_softirq+0x63/0xf0
[ 58.131181][ C1] __do_softirq+0x267/0x92e
[ 58.135655][ C1] ? asm_call_irq_on_stack+0xf/0x20
[ 58.140924][ C1] asm_call_irq_on_stack+0xf/0x20
[ 58.146007][ C1] </IRQ>
[ 58.148951][ C1] do_softirq_own_stack+0x9b/0xe0
[ 58.153948][ C1] __irq_exit_rcu+0x227/0x230
[ 58.158601][ C1] irq_exit_rcu+0x5/0x20
[ 58.162816][ C1] sysvec_apic_timer_interrupt+0xea/0x100
[ 58.168517][ C1] asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 58.174470][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60
[ 58.180507][ C1] Code: 66 2e 0f 1f 84 00 00 00 00 00 be 0d 00 00 00 48 c7 c7 20 b4 54 8b e8 8f 64 3e 00 c3 cc cc cc cc 00 00 cc cc 00 00 cc cc 00 00 <48> 8b 04 24 65 48 8b 0d 34 d7 90 7e 65 8b 15 39 d7 90 7e f7 c2 00
[ 58.200096][ C1] RSP: 0018:ffffc90000f5fbe8 EFLAGS: 00000287
[ 58.206224][ C1] RAX: ffffffff8354fa11 RBX: ffff8880242ccfda RCX: 0000000000000000
[ 58.214171][ C1] RDX: ffff88802e700000 RSI: 000000000000000e RDI: 000000000000005e
[ 58.222116][ C1] RBP: 000000000000000e R08: 0000000059ee1630 R09: 0000000004ea9dbc
[ 58.230069][ C1] R10: 00000000e66b8ec4 R11: 1ffffffff1964e1d R12: 000000000000002f
[ 58.238112][ C1] R13: 0000000000000023 R14: 0000000000000000 R15: ffff888019809300
[ 58.246077][ C1] ? tomoyo_encode2+0x261/0x480
[ 58.250921][ C1] tomoyo_encode2+0x26c/0x480
[ 58.255576][ C1] tomoyo_realpath_from_path+0x5ce/0x620
[ 58.261186][ C1] tomoyo_path_perm+0x15b/0x450
[ 58.266035][ C1] security_inode_getattr+0xd2/0x130
[ 58.271303][ C1] __x64_sys_newfstat+0xa7/0x160
[ 58.276216][ C1] do_syscall_64+0x34/0x50
[ 58.280633][ C1] entry_SYSCALL_64_after_hwframe+0x67/0xd1
[ 58.286497][ C1] RIP: 0033:0x7f14545d9ad7
[ 58.290886][ C1] Code: 73 01 c3 48 8b 0d 21 f3 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 05 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8
[ 58.310729][ C1] RSP: 002b:00007ffe7f42e5c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000005
[ 58.319116][ C1] RAX: ffffffffffffffda RBX: 000000000000000d RCX: 00007f14545d9ad7
[ 58.327065][ C1] RDX: 0000000000090800 RSI: 00007ffe7f42e5d0 RDI: 000000000000000d
[ 58.335014][ C1] RBP: 00007ffe7f42e5d0 R08: 0000000000000000 R09: 0000000000000001
[ 58.342967][ C1] R10: 0000000000000000 R11: 0000000000000202 R12: 000055a2452227b0
[ 58.350913][ C1] R13: 00000000000000ff R14: 000055a2354e0be0 R15: 00007ffe7f42e8f0
[ 58.359252][ C1] Kernel Offset: disabled
[ 58.363605][ C1] Rebooting in 86400 seconds..
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-build3025266266=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
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'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'
git status (err=<nil>)
HEAD detached at b6605ba8b96
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=b6605ba8b96835063c5eb766c38d27fac98b84d4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251013-102005" ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=b6605ba8b96835063c5eb766c38d27fac98b84d4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251013-102005" ./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=b6605ba8b96835063c5eb766c38d27fac98b84d4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251013-102005" -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -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 -std=c++17 -I. -Iexecutor/_include -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"b6605ba8b96835063c5eb766c38d27fac98b84d4\"
/usr/bin/ld: /tmp/ccYc8exG.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): 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
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=13f7f614580000
Tested on:
commit: d3d0b4e2 Linux 5.10.245
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-5.10.y
kernel config: https://syzkaller.appspot.com/x/.config?x=6e4052b2d7feb092
dashboard link: https://syzkaller.appspot.com/bug?extid=77026564530dbc29b854
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=13cbf614580000
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