Message-ID: <0000000000002de17706189731fd@google.com>
Date: Thu, 16 May 2024 12:25:04 -0700
From: syzbot <syzbot+11af34d3c0711f233fd4@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, 
	tytso@....edu
Subject: Re: [syzbot] [ext4?] KASAN: use-after-free Read in
 __ext4_check_dir_entry (2)

Hello,

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

[    T1] Guest personality initialized and is inactive
[    8.065736][    T1] VMCI host device registered (name=vmci, major=10, minor=118)
[    8.066898][    T1] Initialized host personality
[    8.067968][    T1] usbcore: registered new interface driver rtsx_usb
[    8.069719][    T1] usbcore: registered new interface driver viperboard
[    8.071465][    T1] usbcore: registered new interface driver dln2
[    8.073269][    T1] usbcore: registered new interface driver pn533_usb
[    8.080360][    T1] nfcsim 0.2 initialized
[    8.081593][    T1] usbcore: registered new interface driver port100
[    8.083254][    T1] usbcore: registered new interface driver nfcmrvl
[    8.090665][    T1] Loading iSCSI transport class v2.0-870.
[    8.107172][    T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues
[    8.119694][    T1] ------------[ cut here ]------------
[    8.120886][    T1] refcount_t: decrement hit 0; leaking memory.
[    8.122941][    T1] WARNING: CPU: 1 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0
[    8.124604][    T1] Modules linked in:
[    8.125320][    T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc1-syzkaller #0
[    8.127017][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[    8.128730][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    8.129741][    T1] Code: b2 00 00 00 e8 57 79 f2 fc 5b 5d c3 cc cc cc cc e8 4b 79 f2 fc c6 05 01 fb ce 0a 01 90 48 c7 c7 e0 54 fe 8b e8 a7 f7 b4 fc 90 <0f> 0b 90 90 eb d9 e8 2b 79 f2 fc c6 05 de fa ce 0a 01 90 48 c7 c7
[    8.133290][    T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[    8.134369][    T1] RAX: b8e9523c774d7100 RBX: ffff8880203d0a8c RCX: ffff8880166c8000
[    8.135762][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    8.137141][    T1] RBP: 0000000000000004 R08: ffffffff8157ffe2 R09: fffffbfff1bf96e0
[    8.138764][    T1] R10: dffffc0000000000 R11: fffffbfff1bf96e0 R12: ffffea000502edc0
[    8.141948][    T1] R13: ffffea000502edc8 R14: 1ffffd4000a05db9 R15: 0000000000000000
[    8.144186][    T1] FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
[    8.146310][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.147355][    T1] CR2: 0000000000000000 CR3: 000000000df32000 CR4: 00000000003506f0
[    8.149092][    T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    8.150505][    T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    8.151931][    T1] Call Trace:
[    8.152557][    T1]  <TASK>
[    8.153004][    T1]  ? __warn+0x163/0x4e0
[    8.154626][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.156204][    T1]  ? report_bug+0x2b3/0x500
[    8.156899][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.158521][    T1]  ? handle_bug+0x3e/0x70
[    8.159414][    T1]  ? exc_invalid_op+0x1a/0x50
[    8.160449][    T1]  ? asm_exc_invalid_op+0x1a/0x20
[    8.161415][    T1]  ? __warn_printk+0x292/0x360
[    8.162726][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.164466][    T1]  ? refcount_warn_saturate+0xf9/0x1d0
[    8.165736][    T1]  __free_pages_ok+0xc54/0xd80
[    8.166494][    T1]  make_alloc_exact+0xa3/0xf0
[    8.167154][    T1]  vring_alloc_queue_split+0x20a/0x600
[    8.168021][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    8.168973][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    8.169799][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    8.170503][    T1]  ? virtio_dev_probe+0x991/0xaf0
[    8.172229][    T1]  ? really_probe+0x2b8/0xad0
[    8.173145][    T1]  ? driver_probe_device+0x50/0x430
[    8.175331][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    8.176580][    T1]  ? ret_from_fork+0x4b/0x80
[    8.177623][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    8.178852][    T1]  vring_create_virtqueue+0xca/0x110
[    8.179950][    T1]  ? __pfx_vp_notify+0x10/0x10
[    8.181275][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.182572][    T1]  setup_vq+0xe9/0x2d0
[    8.184410][    T1]  ? __pfx_vp_notify+0x10/0x10
[    8.185361][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.186662][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.188204][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.190228][    T1]  vp_setup_vq+0xbf/0x330
[    8.191078][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    8.192362][    T1]  ? ioread16+0x2f/0x90
[    8.193064][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.194742][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    8.196215][    T1]  vp_find_vqs+0x4c/0x4e0
[    8.197081][    T1]  virtscsi_init+0x8db/0xd00
[    8.198316][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    8.200122][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    8.200874][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    8.201727][    T1]  ? vp_get+0xfd/0x140
[    8.202349][    T1]  virtscsi_probe+0x3ea/0xf60
[    8.203024][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    8.204543][    T1]  ? kernfs_add_one+0x156/0x8b0
[    8.205433][    T1]  ? virtio_no_restricted_mem_acc+0x9/0x10
[    8.206402][    T1]  ? virtio_features_ok+0x10c/0x270
[    8.207289][    T1]  virtio_dev_probe+0x991/0xaf0
[    8.208213][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    8.209222][    T1]  really_probe+0x2b8/0xad0
[    8.210139][    T1]  __driver_probe_device+0x1a2/0x390
[    8.210945][    T1]  driver_probe_device+0x50/0x430
[    8.211643][    T1]  __driver_attach+0x45f/0x710
[    8.212336][    T1]  ? __pfx___driver_attach+0x10/0x10
[    8.214017][    T1]  bus_for_each_dev+0x239/0x2b0
[    8.215024][    T1]  ? __pfx___driver_attach+0x10/0x10
[    8.216260][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    8.217520][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    8.218492][    T1]  bus_add_driver+0x347/0x620
[    8.219338][    T1]  driver_register+0x23a/0x320
[    8.220395][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.221416][    T1]  virtio_scsi_init+0x65/0xe0
[    8.222076][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.222889][    T1]  do_one_initcall+0x248/0x880
[    8.223972][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.225067][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    8.226207][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    8.227041][    T1]  ? __pfx_parse_args+0x10/0x10
[    8.227810][    T1]  ? do_initcalls+0x1c/0x80
[    8.228630][    T1]  ? rcu_is_watching+0x15/0xb0
[    8.229515][    T1]  do_initcall_level+0x157/0x210
[    8.230699][    T1]  do_initcalls+0x3f/0x80
[    8.231545][    T1]  kernel_init_freeable+0x435/0x5d0
[    8.232482][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    8.233398][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    8.234520][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.236078][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.236866][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.237618][    T1]  kernel_init+0x1d/0x2b0
[    8.238281][    T1]  ret_from_fork+0x4b/0x80
[    8.238919][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.239745][    T1]  ret_from_fork_asm+0x1a/0x30
[    8.240541][    T1]  </TASK>
[    8.241009][    T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[    8.241978][    T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc1-syzkaller #0
[    8.243074][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[    8.244259][    T1] Call Trace:
[    8.244259][    T1]  <TASK>
[    8.244259][    T1]  dump_stack_lvl+0x241/0x360
[    8.244259][    T1]  ? __pfx_dump_stack_lvl+0x10/0x10
[    8.244259][    T1]  ? __pfx__printk+0x10/0x10
[    8.244259][    T1]  ? _printk+0xd5/0x120
[    8.244259][    T1]  ? vscnprintf+0x5d/0x90
[    8.244259][    T1]  panic+0x349/0x860
[    8.244259][    T1]  ? __warn+0x172/0x4e0
[    8.244259][    T1]  ? __pfx_panic+0x10/0x10
[    8.244259][    T1]  ? show_trace_log_lvl+0x4e6/0x520
[    8.244259][    T1]  ? ret_from_fork_asm+0x1a/0x30
[    8.244259][    T1]  __warn+0x346/0x4e0
[    8.253569][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.253569][    T1]  report_bug+0x2b3/0x500
[    8.253569][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.253569][    T1]  handle_bug+0x3e/0x70
[    8.253569][    T1]  exc_invalid_op+0x1a/0x50
[    8.253569][    T1]  asm_exc_invalid_op+0x1a/0x20
[    8.253569][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    8.253569][    T1] Code: b2 00 00 00 e8 57 79 f2 fc 5b 5d c3 cc cc cc cc e8 4b 79 f2 fc c6 05 01 fb ce 0a 01 90 48 c7 c7 e0 54 fe 8b e8 a7 f7 b4 fc 90 <0f> 0b 90 90 eb d9 e8 2b 79 f2 fc c6 05 de fa ce 0a 01 90 48 c7 c7
[    8.253569][    T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[    8.263675][    T1] RAX: b8e9523c774d7100 RBX: ffff8880203d0a8c RCX: ffff8880166c8000
[    8.263675][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    8.263675][    T1] RBP: 0000000000000004 R08: ffffffff8157ffe2 R09: fffffbfff1bf96e0
[    8.263675][    T1] R10: dffffc0000000000 R11: fffffbfff1bf96e0 R12: ffffea000502edc0
[    8.263675][    T1] R13: ffffea000502edc8 R14: 1ffffd4000a05db9 R15: 0000000000000000
[    8.263675][    T1]  ? __warn_printk+0x292/0x360
[    8.263675][    T1]  ? refcount_warn_saturate+0xf9/0x1d0
[    8.263675][    T1]  __free_pages_ok+0xc54/0xd80
[    8.273618][    T1]  make_alloc_exact+0xa3/0xf0
[    8.273618][    T1]  vring_alloc_queue_split+0x20a/0x600
[    8.273618][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    8.273618][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    8.273618][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    8.273618][    T1]  ? virtio_dev_probe+0x991/0xaf0
[    8.273618][    T1]  ? really_probe+0x2b8/0xad0
[    8.273618][    T1]  ? driver_probe_device+0x50/0x430
[    8.273618][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    8.273618][    T1]  ? ret_from_fork+0x4b/0x80
[    8.273618][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    8.283681][    T1]  vring_create_virtqueue+0xca/0x110
[    8.283681][    T1]  ? __pfx_vp_notify+0x10/0x10
[    8.283681][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.283681][    T1]  setup_vq+0xe9/0x2d0
[    8.283681][    T1]  ? __pfx_vp_notify+0x10/0x10
[    8.283681][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.283681][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.283681][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.283681][    T1]  vp_setup_vq+0xbf/0x330
[    8.293704][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    8.293704][    T1]  ? ioread16+0x2f/0x90
[    8.293704][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.293704][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    8.293704][    T1]  vp_find_vqs+0x4c/0x4e0
[    8.293704][    T1]  virtscsi_init+0x8db/0xd00
[    8.293704][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    8.293704][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    8.293704][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    8.293704][    T1]  ? vp_get+0xfd/0x140
[    8.293704][    T1]  virtscsi_probe+0x3ea/0xf60
[    8.303715][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    8.303715][    T1]  ? kernfs_add_one+0x156/0x8b0
[    8.303715][    T1]  ? virtio_no_restricted_mem_acc+0x9/0x10
[    8.303715][    T1]  ? virtio_features_ok+0x10c/0x270
[    8.303715][    T1]  virtio_dev_probe+0x991/0xaf0
[    8.303715][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    8.303715][    T1]  really_probe+0x2b8/0xad0
[    8.303715][    T1]  __driver_probe_device+0x1a2/0x390
[    8.303715][    T1]  driver_probe_device+0x50/0x430
[    8.303715][    T1]  __driver_attach+0x45f/0x710
[    8.303715][    T1]  ? __pfx___driver_attach+0x10/0x10
[    8.313586][    T1]  bus_for_each_dev+0x239/0x2b0
[    8.313586][    T1]  ? __pfx___driver_attach+0x10/0x10
[    8.313586][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    8.313586][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    8.313586][    T1]  bus_add_driver+0x347/0x620
[    8.313586][    T1]  driver_register+0x23a/0x320
[    8.313586][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.313586][    T1]  virtio_scsi_init+0x65/0xe0
[    8.313586][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.313586][    T1]  do_one_initcall+0x248/0x880
[    8.313586][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.323752][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    8.323752][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    8.323752][    T1]  ? __pfx_parse_args+0x10/0x10
[    8.323752][    T1]  ? do_initcalls+0x1c/0x80
[    8.323752][    T1]  ? rcu_is_watching+0x15/0xb0
[    8.323752][    T1]  do_initcall_level+0x157/0x210
[    8.323752][    T1]  do_initcalls+0x3f/0x80
[    8.323752][    T1]  kernel_init_freeable+0x435/0x5d0
[    8.323752][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    8.323752][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    8.323752][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.333607][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.333607][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.333607][    T1]  kernel_init+0x1d/0x2b0
[    8.333607][    T1]  ret_from_fork+0x4b/0x80
[    8.333607][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.333607][    T1]  ret_from_fork_asm+0x1a/0x30
[    8.333607][    T1]  </TASK>
[    8.333607][    T1] Kernel Offset: disabled
[    8.333607][    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-build414264796=/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=15f49684980000


Tested on:

commit:         4cece764 Linux 6.9-rc1
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git origin
kernel config:  https://syzkaller.appspot.com/x/.config?x=e98db3f73f65c232
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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