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AJvYcCU3JlMxaQps/yjmEFm4Iip7guBRJ9I5g4zTtDdpeCUQlvx2mvWxNEE9hvFt1PsybKXY0OszG74Q2B2ARDs=@vger.kernel.org X-Gm-Message-State: AOJu0YyNwGgKsAKG85nQEz3uwI18CgVKr6hr3KUruCyA18D0gKAXzefd NPmoBf1XK2MyvrSFlhNzKS7Y1VMHUECiFtgYZTO/rfPWKaBFCgAauUBh13PaDpMYhL047KaRoow DGsLJ2avIDAmQBYHNmoUyf/XqIoshMOk4Z9g1G6KJ69olKOIymoy4atBnnm0= X-Google-Smtp-Source: AGHT+IE1jgnOhkFE8daN2gUtgjSMcQgK+vfUyukjWuyNOLMuLiHaf13UAlxQmmY/A/hhE0n6pi3+YV9Qj6i0yVSIzN4hEu33pZOQ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2217:b0:65f:67b7:95c2 with SMTP id 006d021491bc7-65f67b7d351mr1516986eaf.55.1767956644294; Fri, 09 Jan 2026 03:04:04 -0800 (PST) Date: Fri, 09 Jan 2026 03:04:04 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6960e0a4.050a0220.1c677c.03c4.GAE@google.com> Subject: Re: [syzbot] [btrfs?] general protection fault in create_empty_buffers (5) From: syzbot To: eadavis@qq.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello, syzbot tried to test the proposed patch but the build/boot failed: possible deadlock in do_read_cache_folio =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 WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz-executor/5943 is trying to acquire lock: ffff88803d88bda0 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock i= nclude/linux/fs.h:1027 [inline] ffff88803d88bda0 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: do_read_cach= e_folio+0x71/0x630 mm/filemap.c:4057 but task is already holding lock: ffff88803d88bda0 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock i= nclude/linux/fs.h:1027 [inline] ffff88803d88bda0 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: __do_sys_swa= pon+0x8c5/0x3b30 mm/swapfile.c:3447 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sb->s_type->i_mutex_key#9); lock(&sb->s_type->i_mutex_key#9); *** DEADLOCK *** May be due to missing lock nesting notation 1 lock held by syz-executor/5943: #0: ffff88803d88bda0 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_l= ock include/linux/fs.h:1027 [inline] #0: ffff88803d88bda0 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: __do_sy= s_swapon+0x8c5/0x3b30 mm/swapfile.c:3447 stack backtrace: CPU: 2 UID: 0 PID: 5943 Comm: syz-executor Not tainted syzkaller #0 PREEMPT= (full)=20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16= .3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_deadlock_bug+0x225/0x2f0 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x1497/0x2890 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825 down_write+0x92/0x200 kernel/locking/rwsem.c:1590 inode_lock include/linux/fs.h:1027 [inline] do_read_cache_folio+0x71/0x630 mm/filemap.c:4057 read_mapping_folio include/linux/pagemap.h:1017 [inline] __do_sys_swapon+0xa3c/0x3b30 mm/swapfile.c:3473 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6eec78f687 Code: 73 01 c3 48 c7 c1 a8 ff ff ff 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 a7 00 00 00 0f 05 <48> 3d 01 f0 ff f= f 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdb225a028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a7 RAX: ffffffffffffffda RBX: 00007ffdb225a030 RCX: 00007f6eec78f687 RDX: 0000000000000000 RSI: 0000000000008000 RDI: 00007f6eec814bc1 RBP: 00007f6eec814bc1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 00007f6eec9b4270 R13: 0000000000000000 R14: 00007f6eec830975 R15: 00007f6eec8309b1 [ 53.084811][ T40] audit: type=3D1400 audit(1767956586.888:60): avc: d= enied { rlimitinh } for pid=3D5908 comm=3D"sh" scontext=3Dsystem_u:system= _r:sshd_t tcontext=3Droot:sysadm_r:sysadm_t tclass=3Dprocess permissive=3D1 [ 53.096835][ T40] audit: type=3D1400 audit(1767956586.888:61): avc: d= enied { siginh } for pid=3D5908 comm=3D"sh" scontext=3Dsystem_u:system_r:= sshd_t tcontext=3Droot:sysadm_r:sysadm_t tclass=3Dprocess permissive=3D1 Warning: Permanently added '[localhost]:9988' (ED25519) to the list of know= n hosts. [ 60.278181][ T40] audit: type=3D1400 audit(1767956594.098:62): avc: d= enied { execute } for pid=3D5933 comm=3D"sh" name=3D"syz-execprog" dev=3D= "sda1" ino=3D2020 scontext=3Droot:sysadm_r:sysadm_t tcontext=3Droot:object_= r:etc_runtime_t tclass=3Dfile permissive=3D1 [ 60.287411][ T40] audit: type=3D1400 audit(1767956594.098:63): avc: d= enied { execute_no_trans } for pid=3D5933 comm=3D"sh" path=3D"/syz-execpr= og" dev=3D"sda1" ino=3D2020 scontext=3Droot:sysadm_r:sysadm_t tcontext=3Dro= ot:object_r:etc_runtime_t tclass=3Dfile permissive=3D1 2026/01/09 11:03:15 parsed 1 programs [ 61.777835][ T40] audit: type=3D1400 audit(1767956595.598:64): avc: d= enied { node_bind } for pid=3D5933 comm=3D"syz-execprog" saddr=3D::1 scon= text=3Droot:sysadm_r:sysadm_t tcontext=3Dsystem_u:object_r:node_t tclass=3D= tcp_socket permissive=3D1 [ 64.448665][ T40] audit: type=3D1400 audit(1767956598.268:65): avc: d= enied { mounton } for pid=3D5943 comm=3D"syz-executor" path=3D"/syzcgroup= /unified" dev=3D"sda1" ino=3D2023 scontext=3Droot:sysadm_r:sysadm_t tcontex= t=3Droot:object_r:root_t tclass=3Ddir permissive=3D1 [ 64.458449][ T40] audit: type=3D1400 audit(1767956598.278:66): avc: d= enied { mount } for pid=3D5943 comm=3D"syz-executor" name=3D"/" dev=3D"cg= roup2" ino=3D1 scontext=3Droot:sysadm_r:sysadm_t tcontext=3Dsystem_u:object= _r:cgroup_t tclass=3Dfilesystem permissive=3D1 [ 64.460855][ T5943] cgroup: Unknown subsys name 'net' [ 64.471699][ T40] audit: type=3D1400 audit(1767956598.288:67): avc: d= enied { unmount } for pid=3D5943 comm=3D"syz-executor" scontext=3Droot:sy= sadm_r:sysadm_t tcontext=3Dsystem_u:object_r:cgroup_t tclass=3Dfilesystem p= ermissive=3D1 [ 64.617962][ T5943] cgroup: Unknown subsys name 'cpuset' [ 64.625187][ T5943] cgroup: Unknown subsys name 'rlimit' [ 64.814304][ T40] audit: type=3D1400 audit(1767956598.638:68): avc: d= enied { setattr } for pid=3D5943 comm=3D"syz-executor" name=3D"raw-gadget= " dev=3D"devtmpfs" ino=3D849 scontext=3Droot:sysadm_r:sysadm_t tcontext=3Ds= ystem_u:object_r:device_t tclass=3Dchr_file permissive=3D1 [ 64.822507][ T40] audit: type=3D1400 audit(1767956598.638:69): avc: d= enied { create } for pid=3D5943 comm=3D"syz-executor" scontext=3Droot:sys= adm_r:sysadm_t tcontext=3Droot:sysadm_r:sysadm_t tclass=3Dnetlink_generic_s= ocket permissive=3D1 [ 64.830130][ T40] audit: type=3D1400 audit(1767956598.638:70): avc: d= enied { write } for pid=3D5943 comm=3D"syz-executor" scontext=3Droot:sysa= dm_r:sysadm_t tcontext=3Droot:sysadm_r:sysadm_t tclass=3Dnetlink_generic_so= cket permissive=3D1 [ 64.837309][ T40] audit: type=3D1400 audit(1767956598.638:71): avc: d= enied { read } for pid=3D5943 comm=3D"syz-executor" scontext=3Droot:sysad= m_r:sysadm_t tcontext=3Droot:sysadm_r:sysadm_t tclass=3Dnetlink_generic_soc= ket permissive=3D1 [ 64.898978][ T5946] SELinux: Context root:object_r:swapfile_t is not va= lid (left unmapped). Setting up swapspace version 1, size =3D 127995904 bytes [ 65.699886][ T5943]=20 [ 65.701037][ T5943] =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 [ 65.703700][ T5943] WARNING: possible recursive locking detected [ 65.706218][ T5943] syzkaller #0 Not tainted [ 65.708005][ T5943] -------------------------------------------- [ 65.710557][ T5943] syz-executor/5943 is trying to acquire lock: [ 65.713078][ T5943] ffff88803d88bda0 (&sb->s_type->i_mutex_key#9){++++}-= {4:4}, at: do_read_cache_folio+0x71/0x630 [ 65.717231][ T5943]=20 [ 65.717231][ T5943] but task is already holding lock: [ 65.720205][ T5943] ffff88803d88bda0 (&sb->s_type->i_mutex_key#9){++++}-= {4:4}, at: __do_sys_swapon+0x8c5/0x3b30 [ 65.724343][ T5943]=20 [ 65.724343][ T5943] other info that might help us debug this: [ 65.727468][ T5943] Possible unsafe locking scenario: [ 65.727468][ T5943]=20 [ 65.730398][ T5943] CPU0 [ 65.731745][ T5943] ---- [ 65.733146][ T5943] lock(&sb->s_type->i_mutex_key#9); [ 65.735015][ T5943] lock(&sb->s_type->i_mutex_key#9); [ 65.737050][ T5943]=20 [ 65.737050][ T5943] *** DEADLOCK *** [ 65.737050][ T5943]=20 [ 65.740266][ T5943] May be due to missing lock nesting notation [ 65.740266][ T5943]=20 [ 65.743600][ T5943] 1 lock held by syz-executor/5943: [ 65.745702][ T5943] #0: ffff88803d88bda0 (&sb->s_type->i_mutex_key#9){+= +++}-{4:4}, at: __do_sys_swapon+0x8c5/0x3b30 [ 65.749925][ T5943]=20 [ 65.749925][ T5943] stack backtrace: [ 65.752320][ T5943] CPU: 2 UID: 0 PID: 5943 Comm: syz-executor Not taint= ed syzkaller #0 PREEMPT(full)=20 [ 65.752343][ T5943] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), = BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 65.752354][ T5943] Call Trace: [ 65.752363][ T5943] [ 65.752370][ T5943] dump_stack_lvl+0x116/0x1f0 [ 65.752397][ T5943] print_deadlock_bug+0x225/0x2f0 [ 65.752418][ T5943] __lock_acquire+0x1497/0x2890 [ 65.752442][ T5943] lock_acquire+0x179/0x330 [ 65.752461][ T5943] ? do_read_cache_folio+0x71/0x630 [ 65.752480][ T5943] ? __pfx___might_resched+0x10/0x10 [ 65.752498][ T5943] down_write+0x92/0x200 [ 65.752522][ T5943] ? do_read_cache_folio+0x71/0x630 [ 65.752539][ T5943] ? __pfx_down_write+0x10/0x10 [ 65.752564][ T5943] ? down_write+0x14d/0x200 [ 65.752587][ T5943] do_read_cache_folio+0x71/0x630 [ 65.752604][ T5943] ? __pfx_ext4_read_folio+0x10/0x10 [ 65.752622][ T5943] __do_sys_swapon+0xa3c/0x3b30 [ 65.752644][ T5943] ? __pfx_restore_altstack+0x10/0x10 [ 65.752663][ T5943] ? lockdep_hardirqs_on+0x7c/0x110 [ 65.752686][ T5943] ? restore_signal_shadow_stack+0x63/0x460 [ 65.752713][ T5943] ? __do_sys_rt_sigreturn+0x1da/0x2c0 [ 65.752739][ T5943] ? __pfx___do_sys_swapon+0x10/0x10 [ 65.752759][ T5943] ? rcu_is_watching+0x12/0xc0 [ 65.752778][ T5943] do_syscall_64+0xcd/0xf80 [ 65.752799][ T5943] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 65.752817][ T5943] RIP: 0033:0x7f6eec78f687 [ 65.752830][ T5943] Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 4= 8 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a7 00 00 00 0= f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 [ 65.752847][ T5943] RSP: 002b:00007ffdb225a028 EFLAGS: 00000246 ORIG_RAX= : 00000000000000a7 [ 65.752863][ T5943] RAX: ffffffffffffffda RBX: 00007ffdb225a030 RCX: 000= 07f6eec78f687 [ 65.752875][ T5943] RDX: 0000000000000000 RSI: 0000000000008000 RDI: 000= 07f6eec814bc1 [ 65.752885][ T5943] RBP: 00007f6eec814bc1 R08: 0000000000000000 R09: 000= 0000000000000 [ 65.752896][ T5943] R10: 0000000000000008 R11: 0000000000000246 R12: 000= 07f6eec9b4270 [ 65.752906][ T5943] R13: 0000000000000000 R14: 00007f6eec830975 R15: 000= 07f6eec8309b1 [ 65.752922][ T5943] syzkaller build log: go env (err=3D) AR=3D'ar' CC=3D'gcc' CGO_CFLAGS=3D'-O2 -g' CGO_CPPFLAGS=3D'' CGO_CXXFLAGS=3D'-O2 -g' CGO_ENABLED=3D'1' CGO_FFLAGS=3D'-O2 -g' CGO_LDFLAGS=3D'-O2 -g' CXX=3D'g++' GCCGO=3D'gccgo' GO111MODULE=3D'auto' GOAMD64=3D'v1' GOARCH=3D'amd64' GOAUTH=3D'netrc' GOBIN=3D'' GOCACHE=3D'/syzkaller/.cache/go-build' GOCACHEPROG=3D'' GODEBUG=3D'' GOENV=3D'/syzkaller/.config/go/env' GOEXE=3D'' GOEXPERIMENT=3D'' GOFIPS140=3D'off' GOFLAGS=3D'' GOGCCFLAGS=3D'-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=3D0= -ffile-prefix-map=3D/tmp/go-build1604046123=3D/tmp/go-build -gno-record-gc= c-switches' GOHOSTARCH=3D'amd64' GOHOSTOS=3D'linux' GOINSECURE=3D'' GOMOD=3D'/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mo= d' 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'/usr/local/go' GOSUMDB=3D'sum.golang.org' GOTELEMETRY=3D'local' GOTELEMETRYDIR=3D'/syzkaller/.config/go/telemetry' GOTMPDIR=3D'' GOTOOLCHAIN=3D'auto' GOTOOLDIR=3D'/usr/local/go/pkg/tool/linux_amd64' GOVCS=3D'' GOVERSION=3D'go1.24.4' GOWORK=3D'' PKG_CONFIG=3D'pkg-config' git status (err=3D) HEAD detached at d1b870e1003 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}}' -ldflags=3D"-s -w -X github.com/google/syzkaller/pr= og.GitRevision=3Dd1b870e1003b52891d2196c1e2ee42fe905010ba -X github.com/goo= gle/syzkaller/prog.gitRevisionDate=3D20251128-125159" ./sys/syz-sysgen | g= rep -q false || go install -ldflags=3D"-s -w -X github.com/google/syzkaller= /prog.GitRevision=3Dd1b870e1003b52891d2196c1e2ee42fe905010ba -X github.com/= google/syzkaller/prog.gitRevisionDate=3D20251128-125159" ./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/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=3Dd1b870e1003b52891d2196c1e2ee42fe905010ba -X g= ithub.com/google/syzkaller/prog.gitRevisionDate=3D20251128-125159" -o ./bi= n/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\"d1b870e1003b52891d2196c1e2ee42fe90= 5010ba\" /usr/bin/ld: /tmp/cc8lgRxb.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 ./tools/check-syzos.sh 2>/dev/null Tested on: commit: 623fb991 Merge tag 'pinctrl-v6.19-2' of git://git.kern.. git tree: upstream kernel config: https://syzkaller.appspot.com/x/.config?x=3Da11e0f726bfb676= 5 dashboard link: https://syzkaller.appspot.com/bug?extid=3Db4a2af3000eaa84d9= 5d5 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils= for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=3D1271919a5800= 00