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charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello, syzbot tried to test the proposed patch but the build/boot failed: netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 104.385177][ T13] wlan0: Created IBSS using preconfigured BSSID 50:50:= 50:50:50:50 [ 104.388595][ T13] wlan0: Creating new IBSS network, BSSID 50:50:50:50:= 50:50 [ 104.426472][ T13] wlan1: Created IBSS using preconfigured BSSID 50:50:= 50:50:50:50 [ 104.433660][ T13] wlan1: Creating new IBSS network, BSSID 50:50:50:50:= 50:50 [ 104.766732][ T5428]=20 [ 104.767865][ T5428] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D [ 104.770638][ T5428] WARNING: possible recursive locking detected [ 104.773310][ T5428] 6.15.0-rc6-syzkaller-00346-g5723cc3450bc-dirty #0 No= t tainted [ 104.777485][ T5428] -------------------------------------------- [ 104.780117][ T5428] syz-executor/5428 is trying to acquire lock: [ 104.782906][ T5428] ffff88803ef90078 (&hdev->lock){+.+.}-{4:4}, at: mgmt= _index_removed+0x10b/0x310 [ 104.786940][ T5428]=20 [ 104.786940][ T5428] but task is already holding lock: [ 104.790341][ T5428] ffff88803ef90078 (&hdev->lock){+.+.}-{4:4}, at: hci_= unregister_dev+0x2d3/0x500 [ 104.794363][ T5428]=20 [ 104.794363][ T5428] other info that might help us debug this: [ 104.797740][ T5428] Possible unsafe locking scenario: [ 104.797740][ T5428]=20 [ 104.800954][ T5428] CPU0 [ 104.802424][ T5428] ---- [ 104.803931][ T5428] lock(&hdev->lock); [ 104.805663][ T5428] lock(&hdev->lock); [ 104.807445][ T5428]=20 [ 104.807445][ T5428] *** DEADLOCK *** [ 104.807445][ T5428]=20 [ 104.810846][ T5428] May be due to missing lock nesting notation [ 104.810846][ T5428]=20 [ 104.814303][ T5428] 1 lock held by syz-executor/5428: [ 104.816520][ T5428] #0: ffff88803ef90078 (&hdev->lock){+.+.}-{4:4}, at:= hci_unregister_dev+0x2d3/0x500 [ 104.820530][ T5428]=20 [ 104.820530][ T5428] stack backtrace: [ 104.823093][ T5428] CPU: 0 UID: 0 PID: 5428 Comm: syz-executor Not taint= ed 6.15.0-rc6-syzkaller-00346-g5723cc3450bc-dirty #0 PREEMPT(full)=20 [ 104.823106][ T5428] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), = BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 104.823113][ T5428] Call Trace: [ 104.823119][ T5428] [ 104.823124][ T5428] dump_stack_lvl+0x189/0x250 [ 104.823142][ T5428] ? __pfx_dump_stack_lvl+0x10/0x10 [ 104.823155][ T5428] ? __pfx__printk+0x10/0x10 [ 104.823165][ T5428] ? print_lock_name+0xde/0x100 [ 104.823181][ T5428] print_deadlock_bug+0x28b/0x2a0 [ 104.823193][ T5428] validate_chain+0x1a3f/0x2140 [ 104.823202][ T5428] ? _raw_spin_unlock_irqrestore+0xad/0x110 [ 104.823220][ T5428] __lock_acquire+0xaac/0xd20 [ 104.823234][ T5428] ? mgmt_index_removed+0x10b/0x310 [ 104.823245][ T5428] lock_acquire+0x120/0x360 [ 104.823258][ T5428] ? mgmt_index_removed+0x10b/0x310 [ 104.823272][ T5428] __mutex_lock+0x182/0xe80 [ 104.823283][ T5428] ? mgmt_index_removed+0x10b/0x310 [ 104.823298][ T5428] ? __mutex_trylock_common+0x153/0x260 [ 104.823311][ T5428] ? __pfx___mutex_trylock_common+0x10/0x10 [ 104.823320][ T5428] ? mgmt_index_removed+0x10b/0x310 [ 104.823330][ T5428] ? __pfx___mutex_lock+0x10/0x10 [ 104.823343][ T5428] ? rcu_is_watching+0x15/0xb0 [ 104.823352][ T5428] ? trace_contention_end+0x39/0x120 [ 104.823362][ T5428] ? hci_unregister_dev+0x20e/0x500 [ 104.823376][ T5428] mgmt_index_removed+0x10b/0x310 [ 104.823386][ T5428] ? __pfx___mutex_lock+0x10/0x10 [ 104.823399][ T5428] ? __pfx_mgmt_index_removed+0x10/0x10 [ 104.823414][ T5428] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 104.823423][ T5428] ? up_write+0x1c4/0x420 [ 104.823436][ T5428] hci_unregister_dev+0x2db/0x500 [ 104.823449][ T5428] vhci_release+0x80/0xd0 [ 104.823461][ T5428] ? __pfx_vhci_release+0x10/0x10 [ 104.823470][ T5428] __fput+0x44c/0xa70 [ 104.826159][ T5428] task_work_run+0x1d1/0x260 [ 104.826172][ T5428] ? __pfx_task_work_run+0x10/0x10 [ 104.826190][ T5428] ? kmem_cache_free+0x192/0x3f0 [ 104.826207][ T5428] do_exit+0x8d6/0x2550 [ 104.826221][ T5428] ? __pfx_do_exit+0x10/0x10 [ 104.826236][ T5428] ? _raw_spin_unlock_irq+0x23/0x50 [ 104.826246][ T5428] ? lockdep_hardirqs_on+0x9c/0x150 [ 104.826263][ T5428] do_group_exit+0x21c/0x2d0 [ 104.826275][ T5428] __x64_sys_exit_group+0x3f/0x40 [ 104.826288][ T5428] x64_sys_call+0x21ba/0x21c0 [ 104.826304][ T5428] do_syscall_64+0xf6/0x210 [ 104.826317][ T5428] ? clear_bhb_loop+0x60/0xb0 [ 104.826329][ T5428] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 104.826339][ T5428] RIP: 0033:0x7f462058e969 [ 104.826347][ T5428] Code: Unable to access opcode bytes at 0x7f462058e93= f. [ 104.826352][ T5428] RSP: 002b:00007fff116e7dc8 EFLAGS: 00000246 ORIG_RAX= : 00000000000000e7 [ 104.826363][ T5428] RAX: ffffffffffffffda RBX: 00007f4620612297 RCX: 000= 07f462058e969 [ 104.826371][ T5428] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000= 0000000000043 [ 104.826376][ T5428] RBP: 00007f46206122a9 R08: 00007fff116e5b67 R09: 000= 07f462077d260 [ 104.826387][ T5428] R10: 0000000000000000 R11: 0000000000000246 R12: 000= 0000000000006 [ 104.826392][ T5428] R13: 00007f462077d260 R14: 0000000000019780 R15: 000= 07fff116e7f70 [ 104.826402][ T5428] [ 105.221855][ T48] netdevsim netdevsim4 netdevsim3 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 106.001857][ T48] netdevsim netdevsim4 netdevsim2 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 106.032391][ T48] netdevsim netdevsim4 netdevsim1 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 106.062433][ T48] netdevsim netdevsim4 netdevsim0 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 106.141381][ T48] bridge_slave_1: left allmulticast mode [ 106.143913][ T48] bridge_slave_1: left promiscuous mode [ 106.146436][ T48] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 106.151053][ T48] bridge_slave_0: left allmulticast mode [ 106.153527][ T48] bridge_slave_0: left promiscuous mode [ 106.155988][ T48] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 106.233284][ T48] bond0 (unregistering): (slave bond_slave_0): Releasi= ng backup interface [ 106.238207][ T48] bond0 (unregistering): (slave bond_slave_1): Releasi= ng backup interface [ 106.243434][ T48] bond0 (unregistering): Released all slaves [ 106.312852][ T48] hsr_slave_0: left promiscuous mode [ 106.315732][ T48] hsr_slave_1: left promiscuous mode [ 106.318406][ T48] batman_adv: batadv0: Interface deactivated: batadv_s= lave_0 [ 106.323733][ T48] batman_adv: batadv0: Removing interface: batadv_slav= e_0 [ 106.331831][ T48] batman_adv: batadv0: Interface deactivated: batadv_s= lave_1 [ 106.334694][ T48] batman_adv: batadv0: Removing interface: batadv_slav= e_1 [ 106.353667][ T48] veth1_macvtap: left promiscuous mode [ 106.356174][ T48] veth0_macvtap: left promiscuous mode [ 106.358681][ T48] veth1_vlan: left promiscuous mode [ 106.370871][ T48] veth0_vlan: left promiscuous mode [ 106.542004][ T48] team0 (unregistering): Port device team_slave_1 remo= ved [ 106.553795][ T48] team0 (unregistering): Port device team_slave_0 remo= ved VM DIAGNOSIS: 23:41:34 Registers: info registers vcpu 0 CPU#0 RAX=3D0000000000000072 RBX=3D0000000000000072 RCX=3D0000000000000000 RDX=3D= 00000000000003f8 RSI=3D0000000000000000 RDI=3D0000000000000020 RBP=3D00000000000003f8 RSP=3D= ffffc900026d7010 R8 =3Dffff888000b80237 R9 =3D1ffff11000170046 R10=3Ddffffc0000000000 R11=3D= ffffffff853e18b0 R12=3Ddffffc0000000000 R13=3Dffffffff99850c5f R14=3Dffffffff99b55c40 R15=3D= 0000000000000000 RIP=3Dffffffff853e192c RFL=3D00000002 [-------] CPL=3D0 II=3D0 A20=3D1 SMM= =3D0 HLT=3D0 ES =3D0000 0000000000000000 ffffffff 00c00000 CS =3D0010 0000000000000000 ffffffff 00a09b00 DPL=3D0 CS64 [-RA] SS =3D0018 0000000000000000 ffffffff 00c09300 DPL=3D0 DS [-WA] DS =3D0000 0000000000000000 ffffffff 00c00000 FS =3D0000 0000000000000000 ffffffff 00c00000 GS =3D0000 ffff88808d6c2000 ffffffff 00c00000 LDT=3D0000 0000000000000000 ffffffff 00c00000 TR =3D0040 fffffe0000003000 00004087 00008b00 DPL=3D0 TSS64-busy GDT=3D fffffe0000001000 0000007f IDT=3D fffffe0000000000 00000fff CR0=3D80050033 CR2=3D0000000000570e60 CR3=3D000000000dd38000 CR4=3D00352ef0 DR0=3D0000000000000000 DR1=3D0000000000000000 DR2=3D0000000000000000 DR3=3D= 0000000000000000=20 DR6=3D00000000fffe0ff0 DR7=3D0000000000000400 EFER=3D0000000000000d01 FCW=3D037f FSW=3D0000 [ST=3D0] FTW=3D00 MXCSR=3D00001f80 FPR0=3D0000000000000000 0000 FPR1=3D0000000000000000 0000 FPR2=3D0000000000000000 0000 FPR3=3D0000000000000000 0000 FPR4=3D0000000000000000 0000 FPR5=3D0000000000000000 0000 FPR6=3D0000000000000000 0000 FPR7=3D0000000000000000 0000 Opmask00=3D0000000000000000 Opmask01=3D0000000000000000 Opmask02=3D00000000= 00000000 Opmask03=3D0000000000000000 Opmask04=3D0000000000000000 Opmask05=3D0000000000000000 Opmask06=3D00000000= 00000000 Opmask07=3D0000000000000000 ZMM00=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 00000000a60ce07b 00000000cec3662e ZMM01=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 6cee38cca59f481e ZMM02=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM03=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 f17df3c66a3c5e1f d1def7dc81e8bad0 ZMM04=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000001e40 ZMM05=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000040 ZMM06=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 000045fa00000003 28f51c0014361600 ZMM07=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 00000008000045fa 00000000000045fa ZMM08=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 000045fa24a1fa00 25c0ee00e80dbf00 ZMM09=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 50947d00aa1c9d00 0000000022afe300 ZMM10=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 e75ef055f668ac60 5151fed073c43ec7 ZMM11=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 3ebecf9dfc61bdd9 0aecfc0672314c27 ZMM12=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 72c1e96872c1e968 72c1e96872c1e968 ZMM13=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 1bf6d1761bf6d176 1bf6d1761bf6d176 ZMM14=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 a54ff53a3c6ef372 bb67ae856a09e667 ZMM15=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 5be0cd191f83d9ab 9b05688c510e527f ZMM16=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM17=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM18=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM19=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM20=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM21=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM22=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM23=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM24=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM25=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM26=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM27=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM28=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM29=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM30=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ZMM31=3D0000000000000000 0000000000000000 0000000000000000 0000000000000000= 0000000000000000 0000000000000000 0000000000000000 0000000000000000 syzkaller build log: go env (err=3D) GO111MODULE=3D'auto' GOARCH=3D'amd64' GOBIN=3D'' GOCACHE=3D'/syzkaller/.cache/go-build' GOENV=3D'/syzkaller/.config/go/env' GOEXE=3D'' GOEXPERIMENT=3D'' GOFLAGS=3D'' GOHOSTARCH=3D'amd64' GOHOSTOS=3D'linux' GOINSECURE=3D'' GOMODCACHE=3D'/syzkaller/jobs/linux/gopath/pkg/mod' GONOPROXY=3D'' GONOSUMDB=3D'' GOOS=3D'linux' GOPATH=3D'/syzkaller/jobs/linux/gopath' GOPRIVATE=3D'' GOPROXY=3D'https://proxy.golang.org,direct' GOROOT=3D'/syzkaller/jobs/linux/gopath/pkg/mod/golang.org/toolchain@v0.0.1-= go1.23.7.linux-amd64' GOSUMDB=3D'sum.golang.org' GOTMPDIR=3D'' GOTOOLCHAIN=3D'auto' GOTOOLDIR=3D'/syzkaller/jobs/linux/gopath/pkg/mod/golang.org/toolchain@v0.0= .1-go1.23.7.linux-amd64/pkg/tool/linux_amd64' GOVCS=3D'' GOVERSION=3D'go1.23.7' GODEBUG=3D'' GOTELEMETRY=3D'local' GOTELEMETRYDIR=3D'/syzkaller/.config/go/telemetry' GCCGO=3D'gccgo' GOAMD64=3D'v1' AR=3D'ar' CC=3D'gcc' CXX=3D'g++' CGO_ENABLED=3D'1' GOMOD=3D'/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mo= d' GOWORK=3D'' CGO_CFLAGS=3D'-O2 -g' CGO_CPPFLAGS=3D'' CGO_CXXFLAGS=3D'-O2 -g' CGO_FFLAGS=3D'-O2 -g' CGO_LDFLAGS=3D'-O2 -g' PKG_CONFIG=3D'pkg-config' GOGCCFLAGS=3D'-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=3D0= -ffile-prefix-map=3D/tmp/go-build4194737262=3D/tmp/go-build -gno-record-gc= c-switches' git status (err=3D) HEAD detached at 77908e5f2 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/contribut= ing.md#using-syz-env go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sy= s/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/contribut= ing.md#using-syz-env bin/syz-sysgen touch .descriptions GOOS=3Dlinux GOARCH=3Damd64 go build "-ldflags=3D-s -w -X github.com/google= /syzkaller/prog.GitRevision=3D77908e5f2ae80bee6d434bca762a25a0a5fc6a83 -X '= github.com/google/syzkaller/prog.gitRevisionDate=3D20250509-090543'" -o ./b= in/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 -Wfr= ame-larger-than=3D16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-forma= t-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -= static-pie -std=3Dc++17 -I. -Iexecutor/_include -DGOOS_linux=3D1 -DGOARCH= _amd64=3D1 \ -DHOSTGOOS_linux=3D1 -DGIT_REVISION=3D\"77908e5f2ae80bee6d434bca762a25a0a5= fc6a83\" /usr/bin/ld: /tmp/ccbAI600.o: in function `Connection::Connect(char const*,= char const*)': executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEP= KcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applicat= ions requires at runtime the shared libraries from the glibc version used f= or linking Error text is too large and was truncated, full error text is at: https://syzkaller.appspot.com/x/error.txt?x=3D17375ef4580000 Tested on: commit: 5723cc34 Merge tag 'dmaengine-fix-6.15' of git://git.k.. git tree: upstream kernel config: https://syzkaller.appspot.com/x/.config?x=3Dc3f0e807ec5d126= 8 dashboard link: https://syzkaller.appspot.com/bug?extid=3Dfeb0dc579bbe30a13= 190 compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-= 1~exp1~20250402004600.97), Debian LLD 20.1.2 patch: https://syzkaller.appspot.com/x/patch.diff?x=3D17326ef45800= 00