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SubjectRe: [syzbot] [ext4?] KASAN: use-after-free Read in __ext4_check_dir_entry (2)
From
Hello,

syzbot tried to test the proposed patch but the build/boot failed:

e=vmci, major=10, minor=118)
[ 7.595612][ T1] Initialized host personality
[ 7.597261][ T1] usbcore: registered new interface driver rtsx_usb
[ 7.599908][ T1] usbcore: registered new interface driver viperboard
[ 7.603226][ T1] usbcore: registered new interface driver dln2
[ 7.605088][ T1] usbcore: registered new interface driver pn533_usb
[ 7.611678][ T1] nfcsim 0.2 initialized
[ 7.613262][ T1] usbcore: registered new interface driver port100
[ 7.614710][ T1] usbcore: registered new interface driver nfcmrvl
[ 7.622445][ T1] Loading iSCSI transport class v2.0-870.
[ 7.640265][ T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues
[ 7.650480][ T1] ------------[ cut here ]------------
[ 7.651656][ T1] refcount_t: decrement hit 0; leaking memory.
[ 7.653009][ T1] WARNING: CPU: 0 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0
[ 7.654567][ T1] Modules linked in:
[ 7.655274][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc4-syzkaller-00039-g26770a717cac #0
[ 7.656739][ T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[ 7.658271][ T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[ 7.659267][ T1] Code: b2 00 00 00 e8 57 49 f0 fc 5b 5d c3 cc cc cc cc e8 4b 49 f0 fc c6 05 4c 96 ec 0a 01 90 48 c7 c7 40 5d 1e 8c e8 c7 c5 b2 fc 90 <0f> 0b 90 90 eb d9 e8 2b 49 f0 fc c6 05 29 96 ec 0a 01 90 48 c7 c7
[ 7.662662][ T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[ 7.663683][ T1] RAX: 6a628a5cb0f41700 RBX: ffff8881401ae78c RCX: ffff888016ac0000
[ 7.665039][ T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 7.666341][ T1] RBP: 0000000000000004 R08: ffffffff81587fc2 R09: fffffbfff1c39b48
[ 7.667553][ T1] R10: dffffc0000000000 R11: fffffbfff1c39b48 R12: ffffea0000858dc0
[ 7.669559][ T1] R13: ffffea0000858dc8 R14: 1ffffd400010b1b9 R15: 0000000000000000
[ 7.671059][ T1] FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
[ 7.672346][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 7.673289][ T1] CR2: ffff88823ffff000 CR3: 000000000e134000 CR4: 00000000003506f0
[ 7.674581][ T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 7.675775][ T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 7.676905][ T1] Call Trace:
[ 7.677523][ T1] <TASK>
[ 7.678310][ T1] ? __warn+0x163/0x4e0
[ 7.679650][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 7.680990][ T1] ? report_bug+0x2b3/0x500
[ 7.681762][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 7.682951][ T1] ? handle_bug+0x3e/0x70
[ 7.683875][ T1] ? exc_invalid_op+0x1a/0x50
[ 7.684757][ T1] ? asm_exc_invalid_op+0x1a/0x20
[ 7.686125][ T1] ? __warn_printk+0x292/0x360
[ 7.687439][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 7.688770][ T1] ? refcount_warn_saturate+0xf9/0x1d0
[ 7.689853][ T1] __free_pages_ok+0xc54/0xd80
[ 7.690752][ T1] make_alloc_exact+0xa3/0xf0
[ 7.691436][ T1] vring_alloc_queue_split+0x20a/0x600
[ 7.692294][ T1] ? __pfx_vring_alloc_queue_split+0x10/0x10
[ 7.693145][ T1] ? vp_find_vqs+0x4c/0x4e0
[ 7.693988][ T1] ? virtscsi_probe+0x3ea/0xf60
[ 7.694794][ T1] ? virtio_dev_probe+0x991/0xaf0
[ 7.695541][ T1] ? really_probe+0x2b8/0xad0
[ 7.696410][ T1] ? driver_probe_device+0x50/0x430
[ 7.698097][ T1] vring_create_virtqueue_split+0xc6/0x310
[ 7.699062][ T1] ? ret_from_fork+0x4b/0x80
[ 7.699790][ T1] ? __pfx_vring_create_virtqueue_split+0x10/0x10
[ 7.700886][ T1] vring_create_virtqueue+0xca/0x110
[ 7.701895][ T1] ? __pfx_vp_notify+0x10/0x10
[ 7.703155][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.704118][ T1] setup_vq+0xe9/0x2d0
[ 7.704736][ T1] ? __pfx_vp_notify+0x10/0x10
[ 7.705391][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.706755][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.708116][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.708982][ T1] vp_setup_vq+0xbf/0x330
[ 7.709609][ T1] ? __pfx_vp_config_changed+0x10/0x10
[ 7.710370][ T1] ? ioread16+0x2f/0x90
[ 7.711005][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.711861][ T1] vp_find_vqs_msix+0x8b2/0xc80
[ 7.712762][ T1] vp_find_vqs+0x4c/0x4e0
[ 7.713463][ T1] virtscsi_init+0x8db/0xd00
[ 7.714142][ T1] ? __pfx_virtscsi_init+0x10/0x10
[ 7.715032][ T1] ? __pfx_default_calc_sets+0x10/0x10
[ 7.715928][ T1] ? scsi_host_alloc+0xa57/0xea0
[ 7.716710][ T1] ? vp_get+0xfd/0x140
[ 7.717535][ T1] virtscsi_probe+0x3ea/0xf60
[ 7.718252][ T1] ? __pfx_virtscsi_probe+0x10/0x10
[ 7.719062][ T1] ? vm_set+0xdd/0x3a0
[ 7.720396][ T1] ? __pfx_vp_set_status+0x10/0x10
[ 7.721514][ T1] ? vp_set_status+0x1a/0x40
[ 7.722164][ T1] ? virtio_no_restricted_mem_acc+0x9/0x10
[ 7.723108][ T1] ? virtio_features_ok+0x10c/0x270
[ 7.723887][ T1] virtio_dev_probe+0x991/0xaf0
[ 7.724709][ T1] ? __pfx_virtio_dev_probe+0x10/0x10
[ 7.725729][ T1] really_probe+0x2b8/0xad0
[ 7.726650][ T1] __driver_probe_device+0x1a2/0x390
[ 7.727503][ T1] driver_probe_device+0x50/0x430
[ 7.728243][ T1] __driver_attach+0x45f/0x710
[ 7.729022][ T1] ? __pfx___driver_attach+0x10/0x10
[ 7.729890][ T1] bus_for_each_dev+0x239/0x2b0
[ 7.730601][ T1] ? __pfx___driver_attach+0x10/0x10
[ 7.731421][ T1] ? __pfx_bus_for_each_dev+0x10/0x10
[ 7.732219][ T1] ? do_raw_spin_unlock+0x13c/0x8b0
[ 7.733309][ T1] bus_add_driver+0x347/0x620
[ 7.733992][ T1] driver_register+0x23a/0x320
[ 7.734667][ T1] virtio_scsi_init+0x69/0xe0
[ 7.735752][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 7.736692][ T1] do_one_initcall+0x248/0x880
[ 7.737732][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 7.738937][ T1] ? __pfx_do_one_initcall+0x10/0x10
[ 7.739803][ T1] ? lockdep_hardirqs_on_prepare+0x43d/0x780
[ 7.740876][ T1] ? __pfx_parse_args+0x10/0x10
[ 7.741838][ T1] ? do_initcalls+0x1c/0x80
[ 7.742731][ T1] ? rcu_is_watching+0x15/0xb0
[ 7.743513][ T1] do_initcall_level+0x157/0x210
[ 7.744299][ T1] do_initcalls+0x3f/0x80
[ 7.745007][ T1] kernel_init_freeable+0x435/0x5d0
[ 7.746216][ T1] ? __pfx_kernel_init_freeable+0x10/0x10
[ 7.747097][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[ 7.748009][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.748782][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.749752][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.750548][ T1] kernel_init+0x1d/0x2b0
[ 7.751404][ T1] ret_from_fork+0x4b/0x80
[ 7.752121][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.752911][ T1] ret_from_fork_asm+0x1a/0x30
[ 7.753697][ T1] </TASK>
[ 7.754133][ T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 7.755272][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc4-syzkaller-00039-g26770a717cac #0
[ 7.757227][ T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[ 7.759031][ T1] Call Trace:
[ 7.759506][ T1] <TASK>
[ 7.759733][ T1] dump_stack_lvl+0x241/0x360
[ 7.759733][ T1] ? __pfx_dump_stack_lvl+0x10/0x10
[ 7.759733][ T1] ? __pfx__printk+0x10/0x10
[ 7.759733][ T1] ? _printk+0xd5/0x120
[ 7.759733][ T1] ? vscnprintf+0x5d/0x90
[ 7.759733][ T1] panic+0x349/0x860
[ 7.759733][ T1] ? __warn+0x172/0x4e0
[ 7.759733][ T1] ? __pfx_panic+0x10/0x10
[ 7.759733][ T1] ? show_trace_log_lvl+0x4e6/0x520
[ 7.759733][ T1] ? ret_from_fork_asm+0x1a/0x30
[ 7.759733][ T1] __warn+0x346/0x4e0
[ 7.759733][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 7.759733][ T1] report_bug+0x2b3/0x500
[ 7.769119][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 7.769119][ T1] handle_bug+0x3e/0x70
[ 7.769119][ T1] exc_invalid_op+0x1a/0x50
[ 7.769119][ T1] asm_exc_invalid_op+0x1a/0x20
[ 7.769119][ T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[ 7.769119][ T1] Code: b2 00 00 00 e8 57 49 f0 fc 5b 5d c3 cc cc cc cc e8 4b 49 f0 fc c6 05 4c 96 ec 0a 01 90 48 c7 c7 40 5d 1e 8c e8 c7 c5 b2 fc 90 <0f> 0b 90 90 eb d9 e8 2b 49 f0 fc c6 05 29 96 ec 0a 01 90 48 c7 c7
[ 7.769119][ T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[ 7.769119][ T1] RAX: 6a628a5cb0f41700 RBX: ffff8881401ae78c RCX: ffff888016ac0000
[ 7.769119][ T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 7.778978][ T1] RBP: 0000000000000004 R08: ffffffff81587fc2 R09: fffffbfff1c39b48
[ 7.778978][ T1] R10: dffffc0000000000 R11: fffffbfff1c39b48 R12: ffffea0000858dc0
[ 7.778978][ T1] R13: ffffea0000858dc8 R14: 1ffffd400010b1b9 R15: 0000000000000000
[ 7.778978][ T1] ? __warn_printk+0x292/0x360
[ 7.778978][ T1] ? refcount_warn_saturate+0xf9/0x1d0
[ 7.778978][ T1] __free_pages_ok+0xc54/0xd80
[ 7.778978][ T1] make_alloc_exact+0xa3/0xf0
[ 7.778978][ T1] vring_alloc_queue_split+0x20a/0x600
[ 7.789051][ T1] ? __pfx_vring_alloc_queue_split+0x10/0x10
[ 7.789051][ T1] ? vp_find_vqs+0x4c/0x4e0
[ 7.789051][ T1] ? virtscsi_probe+0x3ea/0xf60
[ 7.789051][ T1] ? virtio_dev_probe+0x991/0xaf0
[ 7.789051][ T1] ? really_probe+0x2b8/0xad0
[ 7.789051][ T1] ? driver_probe_device+0x50/0x430
[ 7.789051][ T1] vring_create_virtqueue_split+0xc6/0x310
[ 7.789051][ T1] ? ret_from_fork+0x4b/0x80
[ 7.789051][ T1] ? __pfx_vring_create_virtqueue_split+0x10/0x10
[ 7.789051][ T1] vring_create_virtqueue+0xca/0x110
[ 7.789051][ T1] ? __pfx_vp_notify+0x10/0x10
[ 7.789051][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.798967][ T1] setup_vq+0xe9/0x2d0
[ 7.798967][ T1] ? __pfx_vp_notify+0x10/0x10
[ 7.798967][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.798967][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.798967][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.798967][ T1] vp_setup_vq+0xbf/0x330
[ 7.798967][ T1] ? __pfx_vp_config_changed+0x10/0x10
[ 7.798967][ T1] ? ioread16+0x2f/0x90
[ 7.798967][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.798967][ T1] vp_find_vqs_msix+0x8b2/0xc80
[ 7.798967][ T1] vp_find_vqs+0x4c/0x4e0
[ 7.798967][ T1] virtscsi_init+0x8db/0xd00
[ 7.798967][ T1] ? __pfx_virtscsi_init+0x10/0x10
[ 7.809054][ T1] ? __pfx_default_calc_sets+0x10/0x10
[ 7.809054][ T1] ? scsi_host_alloc+0xa57/0xea0
[ 7.809054][ T1] ? vp_get+0xfd/0x140
[ 7.809054][ T1] virtscsi_probe+0x3ea/0xf60
[ 7.809054][ T1] ? __pfx_virtscsi_probe+0x10/0x10
[ 7.809054][ T1] ? vm_set+0xdd/0x3a0
[ 7.809054][ T1] ? __pfx_vp_set_status+0x10/0x10
[ 7.809054][ T1] ? vp_set_status+0x1a/0x40
[ 7.809054][ T1] ? virtio_no_restricted_mem_acc+0x9/0x10
[ 7.809054][ T1] ? virtio_features_ok+0x10c/0x270
[ 7.809054][ T1] virtio_dev_probe+0x991/0xaf0
[ 7.809054][ T1] ? __pfx_virtio_dev_probe+0x10/0x10
[ 7.818989][ T1] really_probe+0x2b8/0xad0
[ 7.818989][ T1] __driver_probe_device+0x1a2/0x390
[ 7.818989][ T1] driver_probe_device+0x50/0x430
[ 7.818989][ T1] __driver_attach+0x45f/0x710
[ 7.818989][ T1] ? __pfx___driver_attach+0x10/0x10
[ 7.818989][ T1] bus_for_each_dev+0x239/0x2b0
[ 7.818989][ T1] ? __pfx___driver_attach+0x10/0x10
[ 7.818989][ T1] ? __pfx_bus_for_each_dev+0x10/0x10
[ 7.818989][ T1] ? do_raw_spin_unlock+0x13c/0x8b0
[ 7.818989][ T1] bus_add_driver+0x347/0x620
[ 7.818989][ T1] driver_register+0x23a/0x320
[ 7.818989][ T1] virtio_scsi_init+0x69/0xe0
[ 7.818989][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 7.828983][ T1] do_one_initcall+0x248/0x880
[ 7.829040][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 7.829040][ T1] ? __pfx_do_one_initcall+0x10/0x10
[ 7.829040][ T1] ? lockdep_hardirqs_on_prepare+0x43d/0x780
[ 7.829040][ T1] ? __pfx_parse_args+0x10/0x10
[ 7.829040][ T1] ? do_initcalls+0x1c/0x80
[ 7.829040][ T1] ? rcu_is_watching+0x15/0xb0
[ 7.829040][ T1] do_initcall_level+0x157/0x210
[ 7.829040][ T1] do_initcalls+0x3f/0x80
[ 7.829040][ T1] kernel_init_freeable+0x435/0x5d0
[ 7.829040][ T1] ? __pfx_kernel_init_freeable+0x10/0x10
[ 7.829040][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[ 7.829040][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.838961][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.838961][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.838961][ T1] kernel_init+0x1d/0x2b0
[ 7.838961][ T1] ret_from_fork+0x4b/0x80
[ 7.838961][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.838961][ T1] ret_from_fork_asm+0x1a/0x30
[ 7.838961][ T1] </TASK>
[ 7.838961][ T1] Kernel Offset: disabled
[ 7.838961][ T1] Rebooting in 86400 seconds..


syzkaller build log:
go env (err=<nil>)
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
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'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.4'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build2122882332=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at de979bc20
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}}' ./sys/syz-sysgen | grep -q false || go install ./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=de979bc20b2b73242b7d6fbbdf614a8cb4c574f4 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240509-085021'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=de979bc20b2b73242b7d6fbbdf614a8cb4c574f4 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240509-085021'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
-m64 -std=c++11 -I. -Iexecutor/_include -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 -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"de979bc20b2b73242b7d6fbbdf614a8cb4c574f4\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=168a0e20980000


Tested on:

commit: 26770a71 jbd2: add prefix 'jbd2' for 'shrink_type'
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
kernel config: https://syzkaller.appspot.com/x/.config?x=f47e5e015c177e57
dashboard link: https://syzkaller.appspot.com/bug?extid=11af34d3c0711f233fd4
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.

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