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Tue, 25 Mar 2025 19:43:02 -0700 (PDT) Date: Tue, 25 Mar 2025 19:43:02 -0700 In-Reply-To: <20250326021914.49794-1-richard120310@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67e369b6.050a0220.1ec46.0005.GAE@google.com> Subject: Re: [syzbot] [ocfs2?] KMSAN: uninit-value in _find_next_bit From: syzbot To: linux-kernel@vger.kernel.org, richard120310@gmail.com, 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: d00-0xffff window] [ 6.656788][ T1] pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bff= ff window] [ 6.658493][ T1] pci_bus 0000:00: resource 7 [mem 0xc0000000-0xfebfef= ff window] [ 6.665366][ T1] pci 0000:00:00.0: Limiting direct PCI/PCI transfers [ 6.668676][ T1] PCI: CLS 0 bytes, default 64 [ 6.670292][ T1] PCI-DMA: Using software bounce buffering for IO (SWI= OTLB) [ 6.672676][ T1] software IO TLB: mapped [mem 0x00000000bbffd000-0x00= 000000bfffd000] (64MB) [ 6.675325][ T1] ACPI: bus type thunderbolt registered [ 6.803712][ T1] RAPL PMU: API unit is 2^-32 Joules, 0 fixed counters= , 10737418240 ms ovfl timer [ 6.838838][ T62] kworker/u8:3 (62) used greatest stack depth: 11960 b= ytes left [ 6.921338][ T61] kworker/u8:3 (61) used greatest stack depth: 10624 b= ytes left [ 6.950433][ T1] kvm_amd: CPU 0 isn't AMD or Hygon [ 6.951845][ T1] clocksource: tsc: mask: 0xffffffffffffffff max_cycle= s: 0x1fb6ebe4598, max_idle_ns: 440795211488 ns [ 7.032367][ T1] clocksource: Switched to clocksource tsc [ 28.149270][ T1] Initialise system trusted keyrings [ 28.159166][ T1] workingset: timestamp_bits=3D40 max_order=3D21 bucke= t_order=3D0 [ 28.170925][ T1] DLM installed [ 28.184821][ T1] squashfs: version 4.0 (2009/01/31) Phillip Lougher [ 28.206648][ T1] NFS: Registering the id_resolver key type [ 28.213155][ T1] Key type id_resolver registered [ 28.219287][ T1] Key type id_legacy registered [ 28.224463][ T1] nfs4filelayout_init: NFSv4 File Layout Driver Regist= ering... [ 28.233124][ T1] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Drive= r Registering... [ 28.270691][ T1] Key type cifs.spnego registered [ 28.277562][ T1] Key type cifs.idmap registered [ 28.290673][ T1] ntfs3: Enabled Linux POSIX ACLs support [ 28.296967][ T1] ntfs3: Read-only LZX/Xpress compression included [ 28.303976][ T1] efs: 1.0a - http://aeschi.ch.eu.org/efs/ [ 28.310453][ T1] romfs: ROMFS MTD (C) 2007 Red Hat, Inc. [ 28.317169][ T1] QNX4 filesystem 0.2.3 registered. [ 28.322689][ T1] qnx6: QNX6 filesystem 1.0.0 registered. [ 28.330316][ T1] fuse: init (API version 7.42) [ 28.341243][ T1] orangefs_debugfs_init: called with debug mask: :none= : :0: [ 28.350107][ T1] orangefs_init: module version upstream loaded [ 28.358335][ T1] JFS: nTxBlock =3D 8192, nTxLock =3D 65536 [ 28.399230][ T1] SGI XFS with ACLs, security attributes, realtime, qu= ota, no debug enabled [ 28.425334][ T1] 9p: Installing v9fs 9p2000 file system support [ 28.433158][ T1] NILFS version 2 loaded [ 28.437605][ T1] befs: version: 0.9.3 [ 28.442821][ T1] ocfs2: Registered cluster interface o2cb [ 28.450015][ T1] ocfs2: Registered cluster interface user [ 28.457650][ T1] OCFS2 User DLM kernel interface loaded [ 28.478095][ T1] gfs2: GFS2 installed [ 28.520991][ T1] ceph: loaded (mds proto 32) [ 32.625706][ T1] NET: Registered PF_ALG protocol family [ 32.631717][ T1] xor: automatically using best checksumming function = avx =20 [ 32.639844][ T1] async_tx: api initialized (async) [ 32.645219][ T1] Key type asymmetric registered [ 32.650713][ T1] Asymmetric key parser 'x509' registered [ 32.656758][ T1] Asymmetric key parser 'pkcs8' registered [ 32.663044][ T1] Key type pkcs7_test registered [ 32.669091][ T1] Block layer SCSI generic (bsg) driver version 0.4 lo= aded (major 238) [ 32.679411][ T1] io scheduler mq-deadline registered [ 32.685026][ T1] io scheduler kyber registered [ 32.690920][ T1] io scheduler bfq registered [ 32.709039][ T1] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN= :00/input/input0 [ 32.729404][ T1] ACPI: button: Power Button [PWRF] [ 32.737352][ T1] input: Sleep Button as /devices/LNXSYSTM:00/LNXSLPBN= :00/input/input1 [ 32.748217][ T1] ACPI: button: Sleep Button [SLPF] [ 32.774787][ T1] ioatdma: Intel(R) QuickData Technology Driver 5.00 [ 32.863966][ T1] ACPI: \_SB_.LNKC: Enabled at IRQ 11 [ 32.871214][ T1] virtio-pci 0000:00:03.0: virtio_pci: leaving for leg= acy driver [ 32.945814][ T1] ACPI: \_SB_.LNKD: Enabled at IRQ 10 [ 32.951577][ T1] virtio-pci 0000:00:04.0: virtio_pci: leaving for leg= acy driver [ 33.026375][ T1] ACPI: \_SB_.LNKB: Enabled at IRQ 10 [ 33.032191][ T1] virtio-pci 0000:00:06.0: virtio_pci: leaving for leg= acy driver [ 33.089460][ T1] virtio-pci 0000:00:07.0: virtio_pci: leaving for leg= acy driver [ 34.226900][ T1] N_HDLC line discipline registered with maxframe=3D40= 96 [ 34.234889][ T1] Serial: 8250/16550 driver, 4 ports, IRQ sharing enab= led [ 34.249802][ T1] 00:03: ttyS0 at I/O 0x3f8 (irq =3D 4, base_baud =3D = 115200) is a 16550A [ 34.284139][ T1] 00:04: ttyS1 at I/O 0x2f8 (irq =3D 3, base_baud =3D = 115200) is a 16550A [ 34.313774][ T1] 00:05: ttyS2 at I/O 0x3e8 (irq =3D 6, base_baud =3D = 115200) is a 16550A [ 34.345912][ T1] 00:06: ttyS3 at I/O 0x2e8 (irq =3D 7, base_baud =3D = 115200) is a 16550A [ 34.395124][ T1] Non-volatile memory driver v1.3 [ 34.407451][ T1] BUG: kernel NULL pointer dereference, address: 00000= 00000000000 [ 34.415494][ T1] #PF: supervisor read access in kernel mode [ 34.416986][ T1] #PF: error_code(0x0000) - not-present page [ 34.416986][ T1] PGD 0 P4D 0=20 [ 34.416986][ T1] Oops: Oops: 0000 [#1] SMP PTI [ 34.416986][ T1] CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.1= 4.0-syzkaller-02023-gee6740fd34eb-dirty #0 PREEMPT(undef)=20 [ 34.416986][ T1] Hardware name: Google Google Compute Engine/Google C= ompute Engine, BIOS Google 02/12/2025 [ 34.416986][ T1] RIP: 0010:msix_capability_init+0x95c/0x18c0 [ 34.416986][ T1] Code: ff ff ff 48 89 9d 60 fe ff ff 48 89 9d 08 ff f= f ff 48 83 bd 30 ff ff ff 00 4c 8b 75 c8 0f 85 1d 02 00 00 48 8b bd 58 ff f= f ff <44> 8b 27 b8 00 00 40 00 41 21 c4 e8 e4 a8 ad fb 8b 18 44 8b 3a 41 [ 34.416986][ T1] RSP: 0000:ffff888100642fb0 EFLAGS: 00010246 [ 34.416986][ T1] RAX: ffff8880bba43080 RBX: ffffc90000b3f008 RCX: 000= 0000100243080 [ 34.416986][ T1] RDX: ffff888100243080 RSI: ffff88813fffacc0 RDI: 000= 0000000000000 [ 34.506029][ T1] RBP: ffff888100643178 R08: ffffea000000000f R09: 000= 0000000000000 [ 34.506029][ T1] R10: ffff8880bba43020 R11: ffffffff86cfc5e9 R12: 000= 0000000000000 [ 34.506029][ T1] R13: 0000000000000000 R14: ffff8881408d0b58 R15: 000= 000000000000b [ 34.506029][ T1] FS: 0000000000000000(0000) GS:ffff8881ab2b0000(0000= ) knlGS:0000000000000000 [ 34.506029][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.506029][ T1] CR2: 0000000000000000 CR3: 0000000011a80000 CR4: 000= 00000003526f0 [ 34.556031][ T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000= 0000000000000 [ 34.556031][ T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 000= 0000000000400 [ 34.556031][ T1] Call Trace: [ 34.556031][ T1] [ 34.556031][ T1] ? show_trace_log_lvl+0x268/0x3d0 [ 34.556031][ T1] ? __pci_enable_msix_range+0xad9/0xc40 [ 34.556031][ T1] ? __die_body+0xce/0x1a0 [ 34.556031][ T1] ? __die+0x20f/0x270 [ 34.556031][ T1] ? page_fault_oops+0xe58/0xfb0 [ 34.605985][ T1] ? exc_page_fault+0x56c/0x700 [ 34.605985][ T1] ? asm_exc_page_fault+0x2b/0x30 [ 34.605985][ T1] ? __pci_enable_msix_range+0xad9/0xc40 [ 34.605985][ T1] ? msix_capability_init+0x95c/0x18c0 [ 34.605985][ T1] __pci_enable_msix_range+0xad9/0xc40 [ 34.605985][ T1] ? kmsan_get_metadata+0x13e/0x1c0 [ 34.605985][ T1] ? kmsan_internal_set_shadow_origin+0x6c/0x100 [ 34.605985][ T1] pci_alloc_irq_vectors_affinity+0x111/0x3a0 [ 34.605985][ T1] vp_find_vqs_msix+0x84d/0x1560 [ 34.656028][ T1] ? kmsan_internal_unpoison_memory+0x14/0x20 [ 34.656028][ T1] vp_find_vqs+0x6c/0xa80 [ 34.656028][ T1] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 34.656028][ T1] ? __pfx_vp_find_vqs+0x10/0x10 [ 34.656028][ T1] probe_common+0x3b4/0x970 [ 34.656028][ T1] ? __pfx_random_recv_done+0x10/0x10 [ 34.656028][ T1] ? kmsan_get_metadata+0x13e/0x1c0 [ 34.656028][ T1] virtrng_probe+0x2d/0x40 [ 34.656028][ T1] ? __pfx_virtrng_probe+0x10/0x10 [ 34.656028][ T1] virtio_dev_probe+0x1640/0x19a0 [ 34.706032][ T1] ? __pfx_virtio_dev_probe+0x10/0x10 [ 34.706032][ T1] really_probe+0x4dc/0xd90 [ 34.706032][ T1] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 34.706032][ T1] __driver_probe_device+0x2ab/0x5d0 [ 34.706032][ T1] driver_probe_device+0x72/0x890 [ 34.706032][ T1] __driver_attach+0x7ea/0xb50 [ 34.706032][ T1] bus_for_each_dev+0x350/0x540 [ 34.706032][ T1] ? __pfx___driver_attach+0x10/0x10 [ 34.706032][ T1] driver_attach+0x51/0x70 [ 34.755983][ T1] bus_add_driver+0x74c/0xdb0 [ 34.755983][ T1] driver_register+0x3fb/0x660 [ 34.755983][ T1] __register_virtio_driver+0xf1/0x120 [ 34.755983][ T1] ? __pfx_virtio_rng_driver_init+0x10/0x10 [ 34.755983][ T1] virtio_rng_driver_init+0x2e/0x40 [ 34.755983][ T1] do_one_initcall+0x228/0xbf0 [ 34.755983][ T1] ? kmsan_internal_set_shadow_origin+0x6c/0x100 [ 34.755983][ T1] ? __pfx_virtio_rng_driver_init+0x10/0x10 [ 34.755983][ T1] ? advisor_target_scan_time_store+0x120/0x180 [ 34.805996][ T1] ? irqentry_enter+0x37/0x60 [ 34.805996][ T1] ? sysvec_apic_timer_interrupt+0x52/0x90 [ 34.805996][ T1] ? kmsan_get_metadata+0x13e/0x1c0 [ 34.805996][ T1] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 34.805996][ T1] ? kmsan_get_metadata+0x13e/0x1c0 [ 34.805996][ T1] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 34.805996][ T1] ? kmsan_get_metadata+0x13e/0x1c0 [ 34.805996][ T1] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 34.805996][ T1] ? parameq+0x43a/0x470 [ 34.856033][ T1] ? kmsan_get_metadata+0x13e/0x1c0 [ 34.856033][ T1] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 34.856033][ T1] ? parse_args+0xfde/0x10a0 [ 34.856033][ T1] ? kmsan_get_metadata+0x13e/0x1c0 [ 34.856033][ T1] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 34.856033][ T1] ? __pfx_virtio_rng_driver_init+0x10/0x10 [ 34.856033][ T1] do_initcall_level+0x140/0x350 [ 34.856033][ T1] do_initcalls+0x1a6/0x2f0 [ 34.856033][ T1] ? __pfx_native_smp_prepare_cpus+0x10/0x10 [ 34.906320][ T1] do_basic_setup+0x22/0x30 [ 34.906320][ T1] kernel_init_freeable+0x306/0x4c0 [ 34.906320][ T1] ? __pfx_kernel_init+0x10/0x10 [ 34.906320][ T1] kernel_init+0x2f/0x800 [ 34.906320][ T1] ? __pfx_kernel_init+0x10/0x10 [ 34.906320][ T1] ret_from_fork+0x6d/0x90 [ 34.906320][ T1] ? __pfx_kernel_init+0x10/0x10 [ 34.906320][ T1] ret_from_fork_asm+0x1a/0x30 [ 34.906320][ T1] RIP: 1f0f:0x0 [ 34.906320][ T1] Code: Unable to access opcode bytes at 0xfffffffffff= fffd6. [ 34.956009][ T1] RSP: 0000:0000000000000000 EFLAGS: 841f0f2e66 ORIG_R= AX: 1f0f2e6600000000 [ 34.956009][ T1] RAX: 0000000000000000 RBX: 1f0f2e6600000000 RCX: 2e6= 6000000000084 [ 34.956009][ T1] RDX: 0000000000841f0f RSI: 000000841f0f2e66 RDI: 008= 41f0f2e660000 [ 34.956009][ T1] RBP: 00841f0f2e660000 R08: 00841f0f2e660000 R09: 000= 000841f0f2e66 [ 34.956009][ T1] R10: 0000000000841f0f R11: 2e66000000000084 R12: 000= 000841f0f2e66 [ 34.997502][ T1] R13: 0000000000841f0f R14: 2e66000000000084 R15: 1f0= f2e6600000000 [ 35.005965][ T1] [ 35.005965][ T1] Modules linked in: [ 35.005965][ T1] CR2: 0000000000000000 [ 35.005965][ T1] ---[ end trace 0000000000000000 ]--- [ 35.005965][ T1] RIP: 0010:msix_capability_init+0x95c/0x18c0 [ 35.005965][ T1] Code: ff ff ff 48 89 9d 60 fe ff ff 48 89 9d 08 ff f= f ff 48 83 bd 30 ff ff ff 00 4c 8b 75 c8 0f 85 1d 02 00 00 48 8b bd 58 ff f= f ff <44> 8b 27 b8 00 00 40 00 41 21 c4 e8 e4 a8 ad fb 8b 18 44 8b 3a 41 [ 35.005965][ T1] RSP: 0000:ffff888100642fb0 EFLAGS: 00010246 [ 35.056178][ T1] RAX: ffff8880bba43080 RBX: ffffc90000b3f008 RCX: 000= 0000100243080 [ 35.056178][ T1] RDX: ffff888100243080 RSI: ffff88813fffacc0 RDI: 000= 0000000000000 [ 35.056178][ T1] RBP: ffff888100643178 R08: ffffea000000000f R09: 000= 0000000000000 [ 35.056178][ T1] R10: ffff8880bba43020 R11: ffffffff86cfc5e9 R12: 000= 0000000000000 [ 35.056178][ T1] R13: 0000000000000000 R14: ffff8881408d0b58 R15: 000= 000000000000b [ 35.056178][ T1] FS: 0000000000000000(0000) GS:ffff8881ab2b0000(0000= ) knlGS:0000000000000000 [ 35.106029][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.106029][ T1] CR2: 0000000000000000 CR3: 0000000011a80000 CR4: 000= 00000003526f0 [ 35.106029][ T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000= 0000000000000 [ 35.106029][ T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 000= 0000000000400 [ 35.106029][ T1] Kernel panic - not syncing: Fatal exception [ 35.106029][ T1] Kernel Offset: disabled [ 35.106029][ T1] Rebooting in 86400 seconds.. 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-2/linux/gopath/pkg/mod' GONOPROXY=3D'' GONOSUMDB=3D'' GOOS=3D'linux' GOPATH=3D'/syzkaller/jobs-2/linux/gopath' GOPRIVATE=3D'' GOPROXY=3D'https://proxy.golang.org,direct' GOROOT=3D'/syzkaller/jobs-2/linux/gopath/pkg/mod/golang.org/toolchain@v0.0.= 1-go1.23.6.linux-amd64' GOSUMDB=3D'sum.golang.org' GOTMPDIR=3D'' GOTOOLCHAIN=3D'auto' GOTOOLDIR=3D'/syzkaller/jobs-2/linux/gopath/pkg/mod/golang.org/toolchain@v0= .0.1-go1.23.6.linux-amd64/pkg/tool/linux_amd64' GOVCS=3D'' GOVERSION=3D'go1.23.6' 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-2/linux/gopath/src/github.com/google/syzkaller/go.= mod' 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-build1566228150=3D/tmp/go-build -gno-record-gc= c-switches' git status (err=3D) HEAD detached at 22a6c2b175 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=3D22a6c2b1752ef57d8d612e233d35f6be8c3bf7df -X '= github.com/google/syzkaller/prog.gitRevisionDate=3D20250318-101307'" -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\"22a6c2b1752ef57d8d612e233d35f6be8c= 3bf7df\" /usr/bin/ld: /tmp/ccyWCt6N.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=3D1492a804580000 Tested on: commit: ee6740fd Merge tag 'crc-for-linus' of git://git.kernel.. git tree: upstream kernel config: https://syzkaller.appspot.com/x/.config?x=3D28ae396b18d2fa0= 2 dashboard link: https://syzkaller.appspot.com/bug?extid=3D7ea0b96c4ddb49fd1= a70 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debia= n) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=3D1294024c5800= 00