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Message-ID: <6901f0e2.050a0220.32483.020b.GAE@google.com>
Date: Wed, 29 Oct 2025 03:48:02 -0700
From: syzbot <syzbot+b20bbf680bb0f2ecedae@...kaller.appspotmail.com>
To: dmantipov@...dex.ru, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ocfs2?] KASAN: use-after-free Read in ocfs2_dir_foreach_blk
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
omes ready
[ 58.948418][ T1019] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready
[ 58.956145][ T6370] device veth0_vlan entered promiscuous mode
[ 58.970007][ T6370] device veth1_vlan entered promiscuous mode
[ 58.988166][ T1121] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready
[ 58.996279][ T1121] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready
[ 59.004239][ T1121] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready
[ 59.012641][ T1121] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
[ 59.022364][ T6370] device veth0_macvtap entered promiscuous mode
[ 59.033758][ T6370] device veth1_macvtap entered promiscuous mode
[ 59.047533][ T6370] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 59.057709][ T6370] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 59.065252][ T1121] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready
[ 59.073242][ T1121] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready
[ 59.081462][ T1121] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
[ 59.090049][ T1121] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
[ 59.098646][ T1121] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
[ 59.107144][ T1121] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
[ 59.117076][ T6370] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[ 59.126016][ T6370] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[ 59.134732][ T6370] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[ 59.143399][ T6370] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[ 59.174329][ C0] ================================================================================
[ 59.183666][ C0] UBSAN: signed-integer-overflow in ./arch/x86/include/asm/atomic.h:165:11
[ 59.192488][ C0] 1175525299 + 1358810344 cannot be represented in type 'int'
[ 59.200063][ C0] CPU: 0 PID: 6370 Comm: syz-executor Not tainted syzkaller #0
[ 59.207691][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
[ 59.217852][ C0] Call Trace:
[ 59.221135][ C0] <IRQ>
[ 59.223999][ C0] dump_stack+0xfd/0x16e
[ 59.228248][ C0] ubsan_epilogue+0xa/0x30
[ 59.232700][ C0] handle_overflow+0x192/0x1b0
[ 59.237472][ C0] ? __sys_sendto+0x323/0x430
[ 59.242160][ C0] ? prandom_u32+0x1d/0x1f0
[ 59.246674][ C0] ip_idents_reserve+0x14a/0x170
[ 59.251640][ C0] __ip_select_ident+0xe4/0x1c0
[ 59.256503][ C0] iptunnel_xmit+0x466/0x7b0
[ 59.261103][ C0] udp_tunnel_xmit_skb+0x1ba/0x290
[ 59.266427][ C0] geneve_xmit+0x1d05/0x2140
[ 59.271032][ C0] dev_hard_start_xmit+0x294/0x780
[ 59.276150][ C0] __dev_queue_xmit+0x1678/0x28b0
[ 59.281177][ C0] ip6_finish_output2+0x1020/0x1490
[ 59.286390][ C0] NF_HOOK+0x45/0x2c0
[ 59.290567][ C0] ? NF_HOOK+0x2c0/0x2c0
[ 59.294813][ C0] mld_sendpack+0x5f9/0xa70
[ 59.299323][ C0] mld_ifc_timer_expire+0x7e1/0x990
[ 59.304526][ C0] ? lock_acquire+0x78/0x310
[ 59.309234][ C0] ? lock_release+0x69/0x610
[ 59.313846][ C0] ? debug_object_deactivate+0x9b/0x250
[ 59.319401][ C0] ? mld_gq_timer_expire+0xe0/0xe0
[ 59.324524][ C0] call_timer_fn+0x105/0x440
[ 59.329120][ C0] ? mld_gq_timer_expire+0xe0/0xe0
[ 59.334331][ C0] __run_timers+0x5d8/0x7a0
[ 59.338941][ C0] ? __do_softirq+0x164/0x8ae
[ 59.343624][ C0] run_timer_softirq+0x19/0x30
[ 59.348392][ C0] __do_softirq+0x23c/0x8ae
[ 59.352911][ C0] ? asm_call_irq_on_stack+0xf/0x20
[ 59.358118][ C0] asm_call_irq_on_stack+0xf/0x20
[ 59.363137][ C0] </IRQ>
[ 59.366089][ C0] do_softirq_own_stack+0x6d/0xb0
[ 59.371295][ C0] __irq_exit_rcu+0x1e1/0x1f0
[ 59.375980][ C0] irq_exit_rcu+0x5/0x20
[ 59.380251][ C0] sysvec_apic_timer_interrupt+0x9d/0xb0
[ 59.385992][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 59.392003][ C0] RIP: 0010:memset_erms+0xb/0x20
[ 59.396940][ C0] Code: 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 e9 bd e1 3a 05 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 49
[ 59.416545][ C0] RSP: 0018:ffffc90001a4f468 EFLAGS: 00000202
[ 59.422707][ C0] RAX: 0000000000000000 RBX: ffff8880376f2648 RCX: 0000000000000000
[ 59.430762][ C0] RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff8880376f2658
[ 59.438798][ C0] RBP: 0000000000040cd0 R08: dffffc0000000000 R09: ffff8880376f2648
[ 59.446750][ C0] R10: ffffed1006ede4cb R11: 1ffff11006ede4c9 R12: 0000000000000007
[ 59.454709][ C0] R13: 0000000000000002 R14: ffff8880376f2760 R15: dffffc0000000000
[ 59.462719][ C0] init_once+0x237/0x260
[ 59.466946][ C0] setup_object+0x40/0x130
[ 59.471344][ C0] new_slab+0x1b0/0x4a0
[ 59.475471][ C0] ? mempolicy_slab_node+0x124/0x2f0
[ 59.480818][ C0] ___slab_alloc+0x3d1/0x580
[ 59.485389][ C0] ? new_inode_pseudo+0x7d/0x220
[ 59.490301][ C0] ? new_inode_pseudo+0x7d/0x220
[ 59.495230][ C0] kmem_cache_alloc+0x131/0x2e0
[ 59.500058][ C0] new_inode_pseudo+0x7d/0x220
[ 59.504986][ C0] new_inode+0x25/0x1c0
[ 59.509118][ C0] ? start_creating+0x1fc/0x310
[ 59.513937][ C0] __debugfs_create_file+0x148/0x520
[ 59.519204][ C0] ieee80211_debugfs_add_netdev+0xd6a/0xe50
[ 59.525082][ C0] ieee80211_if_add+0x717/0x16a0
[ 59.529995][ C0] ieee80211_register_hw+0x2be1/0x3bf0
[ 59.535437][ C0] mac80211_hwsim_new_radio+0x2c63/0x4300
[ 59.541143][ C0] hwsim_new_radio_nl+0xb4f/0xd50
[ 59.546143][ C0] genl_rcv_msg+0xb22/0xdd0
[ 59.550632][ C0] ? hwsim_tx_info_frame_received_nl+0xef0/0xef0
[ 59.556941][ C0] netlink_rcv_skb+0x187/0x390
[ 59.561683][ C0] ? genl_bind+0x2c0/0x2c0
[ 59.566088][ C0] genl_rcv+0x24/0x40
[ 59.570249][ C0] netlink_unicast+0x7b7/0x9b0
[ 59.575081][ C0] netlink_sendmsg+0x968/0xb50
[ 59.579913][ C0] ? netlink_getsockopt+0x4f0/0x4f0
[ 59.585124][ C0] __sock_sendmsg+0x15c/0x170
[ 59.589822][ C0] __sys_sendto+0x323/0x430
[ 59.594319][ C0] __x64_sys_sendto+0xda/0xf0
[ 59.599079][ C0] do_syscall_64+0x34/0x50
[ 59.603471][ C0] entry_SYSCALL_64_after_hwframe+0x67/0xd1
[ 59.609433][ C0] RIP: 0033:0x7f378254ea3c
[ 59.614162][ C0] Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
[ 59.633920][ C0] RSP: 002b:00007ffde7bb18f0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
[ 59.642418][ C0] RAX: ffffffffffffffda RBX: 00007f37832c2620 RCX: 00007f378254ea3c
[ 59.650377][ C0] RDX: 0000000000000024 RSI: 00007f37832c2670 RDI: 0000000000000003
[ 59.658358][ C0] RBP: 0000000000000000 R08: 00007ffde7bb1944 R09: 000000000000000c
[ 59.666342][ C0] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
[ 59.674343][ C0] R13: 0000000000000000 R14: 00007f37832c2670 R15: 0000000000000000
[ 59.682356][ C0] ================================================================================
[ 59.691756][ C0] Kernel panic - not syncing: UBSAN: panic_on_warn set ...
[ 59.698933][ C0] CPU: 0 PID: 6370 Comm: syz-executor Not tainted syzkaller #0
[ 59.706521][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
[ 59.716551][ C0] Call Trace:
[ 59.719834][ C0] <IRQ>
[ 59.722667][ C0] dump_stack+0xfd/0x16e
[ 59.726892][ C0] panic+0x2f0/0x9c0
[ 59.730778][ C0] check_panic_on_warn+0x95/0xe0
[ 59.735693][ C0] handle_overflow+0x192/0x1b0
[ 59.740430][ C0] ? __sys_sendto+0x323/0x430
[ 59.745387][ C0] ? prandom_u32+0x1d/0x1f0
[ 59.749884][ C0] ip_idents_reserve+0x14a/0x170
[ 59.754830][ C0] __ip_select_ident+0xe4/0x1c0
[ 59.759747][ C0] iptunnel_xmit+0x466/0x7b0
[ 59.764421][ C0] udp_tunnel_xmit_skb+0x1ba/0x290
[ 59.769531][ C0] geneve_xmit+0x1d05/0x2140
[ 59.774139][ C0] dev_hard_start_xmit+0x294/0x780
[ 59.779336][ C0] __dev_queue_xmit+0x1678/0x28b0
[ 59.784338][ C0] ip6_finish_output2+0x1020/0x1490
[ 59.789515][ C0] NF_HOOK+0x45/0x2c0
[ 59.793575][ C0] ? NF_HOOK+0x2c0/0x2c0
[ 59.797891][ C0] mld_sendpack+0x5f9/0xa70
[ 59.802474][ C0] mld_ifc_timer_expire+0x7e1/0x990
[ 59.804690][ T6333] Bluetooth: hci0: command 0x0409 tx timeout
[ 59.808108][ C0] ? lock_acquire+0x78/0x310
[ 59.818844][ C0] ? lock_release+0x69/0x610
[ 59.823619][ C0] ? debug_object_deactivate+0x9b/0x250
[ 59.829328][ C0] ? mld_gq_timer_expire+0xe0/0xe0
[ 59.834428][ C0] call_timer_fn+0x105/0x440
[ 59.839004][ C0] ? mld_gq_timer_expire+0xe0/0xe0
[ 59.844183][ C0] __run_timers+0x5d8/0x7a0
[ 59.848682][ C0] ? __do_softirq+0x164/0x8ae
[ 59.853362][ C0] run_timer_softirq+0x19/0x30
[ 59.858110][ C0] __do_softirq+0x23c/0x8ae
[ 59.863190][ C0] ? asm_call_irq_on_stack+0xf/0x20
[ 59.868486][ C0] asm_call_irq_on_stack+0xf/0x20
[ 59.873488][ C0] </IRQ>
[ 59.876458][ C0] do_softirq_own_stack+0x6d/0xb0
[ 59.881487][ C0] __irq_exit_rcu+0x1e1/0x1f0
[ 59.886306][ C0] irq_exit_rcu+0x5/0x20
[ 59.890662][ C0] sysvec_apic_timer_interrupt+0x9d/0xb0
[ 59.896277][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 59.902237][ C0] RIP: 0010:memset_erms+0xb/0x20
[ 59.907244][ C0] Code: 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 e9 bd e1 3a 05 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 49
[ 59.927609][ C0] RSP: 0018:ffffc90001a4f468 EFLAGS: 00000202
[ 59.933668][ C0] RAX: 0000000000000000 RBX: ffff8880376f2648 RCX: 0000000000000000
[ 59.941718][ C0] RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff8880376f2658
[ 59.949681][ C0] RBP: 0000000000040cd0 R08: dffffc0000000000 R09: ffff8880376f2648
[ 59.957856][ C0] R10: ffffed1006ede4cb R11: 1ffff11006ede4c9 R12: 0000000000000007
[ 59.965825][ C0] R13: 0000000000000002 R14: ffff8880376f2760 R15: dffffc0000000000
[ 59.973791][ C0] init_once+0x237/0x260
[ 59.978011][ C0] setup_object+0x40/0x130
[ 59.982784][ C0] new_slab+0x1b0/0x4a0
[ 59.986926][ C0] ? mempolicy_slab_node+0x124/0x2f0
[ 59.992196][ C0] ___slab_alloc+0x3d1/0x580
[ 59.996877][ C0] ? new_inode_pseudo+0x7d/0x220
[ 60.001809][ C0] ? new_inode_pseudo+0x7d/0x220
[ 60.006736][ C0] kmem_cache_alloc+0x131/0x2e0
[ 60.011696][ C0] new_inode_pseudo+0x7d/0x220
[ 60.016537][ C0] new_inode+0x25/0x1c0
[ 60.020675][ C0] ? start_creating+0x1fc/0x310
[ 60.025875][ C0] __debugfs_create_file+0x148/0x520
[ 60.031153][ C0] ieee80211_debugfs_add_netdev+0xd6a/0xe50
[ 60.037336][ C0] ieee80211_if_add+0x717/0x16a0
[ 60.042289][ C0] ieee80211_register_hw+0x2be1/0x3bf0
[ 60.047757][ C0] mac80211_hwsim_new_radio+0x2c63/0x4300
[ 60.053624][ C0] hwsim_new_radio_nl+0xb4f/0xd50
[ 60.058638][ C0] genl_rcv_msg+0xb22/0xdd0
[ 60.063514][ C0] ? hwsim_tx_info_frame_received_nl+0xef0/0xef0
[ 60.069828][ C0] netlink_rcv_skb+0x187/0x390
[ 60.074571][ C0] ? genl_bind+0x2c0/0x2c0
[ 60.078969][ C0] genl_rcv+0x24/0x40
[ 60.082939][ C0] netlink_unicast+0x7b7/0x9b0
[ 60.087778][ C0] netlink_sendmsg+0x968/0xb50
[ 60.092704][ C0] ? netlink_getsockopt+0x4f0/0x4f0
[ 60.098109][ C0] __sock_sendmsg+0x15c/0x170
[ 60.102765][ C0] __sys_sendto+0x323/0x430
[ 60.107339][ C0] __x64_sys_sendto+0xda/0xf0
[ 60.111995][ C0] do_syscall_64+0x34/0x50
[ 60.116391][ C0] entry_SYSCALL_64_after_hwframe+0x67/0xd1
[ 60.122269][ C0] RIP: 0033:0x7f378254ea3c
[ 60.126659][ C0] Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
[ 60.146280][ C0] RSP: 002b:00007ffde7bb18f0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
[ 60.154692][ C0] RAX: ffffffffffffffda RBX: 00007f37832c2620 RCX: 00007f378254ea3c
[ 60.162662][ C0] RDX: 0000000000000024 RSI: 00007f37832c2670 RDI: 0000000000000003
[ 60.170623][ C0] RBP: 0000000000000000 R08: 00007ffde7bb1944 R09: 000000000000000c
[ 60.178672][ C0] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
[ 60.186632][ C0] R13: 0000000000000000 R14: 00007f37832c2670 R15: 0000000000000000
[ 60.194884][ C0] Kernel Offset: disabled
[ 60.199222][ C0] 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-build2528876832=/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 e2beed91937
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=e2beed91937c0ace342f19a2e9afb67adb3a828a -X github.com/google/syzkaller/prog.gitRevisionDate=20250911-084951" ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=e2beed91937c0ace342f19a2e9afb67adb3a828a -X github.com/google/syzkaller/prog.gitRevisionDate=20250911-084951" ./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=e2beed91937c0ace342f19a2e9afb67adb3a828a -X github.com/google/syzkaller/prog.gitRevisionDate=20250911-084951" -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=\"e2beed91937c0ace342f19a2e9afb67adb3a828a\"
/usr/bin/ld: /tmp/ccKwcYCP.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=175fdfe2580000
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=39182a54870857eb
dashboard link: https://syzkaller.appspot.com/bug?extid=b20bbf680bb0f2ecedae
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=16983e7c580000
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