Date: Wed, 29 May 2024 04:48:01 -0700
From: syzbot <syzbot+74ebe2104433e9dc610d@...kaller.appspotmail.com>
To: chao@...nel.org, jaegeuk@...nel.org, 
	linux-f2fs-devel@...ts.sourceforge.net, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [f2fs?] KASAN: slab-use-after-free Read in sanity_check_extent_cache

Hello,

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

42][    T1] usbcore: registered new interface driver dln2
[    7.576709][    T1] usbcore: registered new interface driver pn533_usb
[    7.583988][    T1] nfcsim 0.2 initialized
[    7.586139][    T1] usbcore: registered new interface driver port100
[    7.587701][    T1] usbcore: registered new interface driver nfcmrvl
[    7.594256][    T1] Loading iSCSI transport class v2.0-870.
[    7.612218][    T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues
[    7.621827][    T1] ------------[ cut here ]------------
[    7.622778][    T1] refcount_t: decrement hit 0; leaking memory.
[    7.626782][    T1] WARNING: CPU: 0 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0
[    7.628293][    T1] Modules linked in:
[    7.628860][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc1-syzkaller-00060-g889914b5c209 #0
[    7.630401][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[    7.632495][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    7.634119][    T1] Code: b2 00 00 00 e8 67 52 f2 fc 5b 5d c3 cc cc cc cc e8 5b 52 f2 fc c6 05 51 cc ce 0a 01 90 48 c7 c7 a0 54 fe 8b e8 b7 d0 b4 fc 90 <0f> 0b 90 90 eb d9 e8 3b 52 f2 fc c6 05 2e cc ce 0a 01 90 48 c7 c7
[    7.638094][    T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[    7.639044][    T1] RAX: 343580cc97689700 RBX: ffff8881401bf06c RCX: ffff8880166c8000
[    7.640552][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    7.642175][    T1] RBP: 0000000000000004 R08: ffffffff8157ffe2 R09: fffffbfff1bf96e0
[    7.643575][    T1] R10: dffffc0000000000 R11: fffffbfff1bf96e0 R12: ffffea000501cdc0
[    7.645089][    T1] R13: ffffea000501cdc8 R14: 1ffffd4000a039b9 R15: 0000000000000000
[    7.646458][    T1] FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
[    7.647850][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    7.648816][    T1] CR2: ffff88823ffff000 CR3: 000000000df32000 CR4: 00000000003506f0
[    7.650069][    T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    7.651660][    T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    7.653255][    T1] Call Trace:
[    7.653955][    T1]  <TASK>
[    7.655231][    T1]  ? __warn+0x163/0x4e0
[    7.656060][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.657004][    T1]  ? report_bug+0x2b3/0x500
[    7.657697][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.658659][    T1]  ? handle_bug+0x3e/0x70
[    7.659735][    T1]  ? exc_invalid_op+0x1a/0x50
[    7.660993][    T1]  ? asm_exc_invalid_op+0x1a/0x20
[    7.661819][    T1]  ? __warn_printk+0x292/0x360
[    7.662573][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.663589][    T1]  ? refcount_warn_saturate+0xf9/0x1d0
[    7.664642][    T1]  __free_pages_ok+0xc54/0xd80
[    7.665381][    T1]  make_alloc_exact+0xa3/0xf0
[    7.666771][    T1]  vring_alloc_queue_split+0x20a/0x600
[    7.667714][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    7.668766][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    7.669540][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    7.670758][    T1]  ? virtio_dev_probe+0x991/0xaf0
[    7.671577][    T1]  ? really_probe+0x2b8/0xad0
[    7.672570][    T1]  ? driver_probe_device+0x50/0x430
[    7.673427][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    7.674713][    T1]  ? ret_from_fork+0x4b/0x80
[    7.675577][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    7.676513][    T1]  vring_create_virtqueue+0xca/0x110
[    7.677483][    T1]  ? __pfx_vp_notify+0x10/0x10
[    7.678536][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.679645][    T1]  setup_vq+0xe9/0x2d0
[    7.680389][    T1]  ? __pfx_vp_notify+0x10/0x10
[    7.681211][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.682323][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.683391][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.684728][    T1]  vp_setup_vq+0xbf/0x330
[    7.685412][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    7.686599][    T1]  ? ioread16+0x2f/0x90
[    7.687219][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.688543][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    7.689396][    T1]  vp_find_vqs+0x4c/0x4e0
[    7.690066][    T1]  virtscsi_init+0x8db/0xd00
[    7.690768][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    7.691800][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    7.692645][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    7.693496][    T1]  ? vp_get+0xfd/0x140
[    7.694109][    T1]  virtscsi_probe+0x3ea/0xf60
[    7.695276][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    7.696256][    T1]  ? kernfs_add_one+0x156/0x8b0
[    7.697276][    T1]  ? virtio_no_restricted_mem_acc+0x9/0x10
[    7.698400][    T1]  ? virtio_features_ok+0x10c/0x270
[    7.699300][    T1]  virtio_dev_probe+0x991/0xaf0
[    7.700143][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    7.700985][    T1]  really_probe+0x2b8/0xad0
[    7.702196][    T1]  __driver_probe_device+0x1a2/0x390
[    7.703259][    T1]  driver_probe_device+0x50/0x430
[    7.704075][    T1]  __driver_attach+0x45f/0x710
[    7.704819][    T1]  ? __pfx___driver_attach+0x10/0x10
[    7.705601][    T1]  bus_for_each_dev+0x239/0x2b0
[    7.706514][    T1]  ? __pfx___driver_attach+0x10/0x10
[    7.707442][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    7.708680][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    7.710058][    T1]  bus_add_driver+0x347/0x620
[    7.711073][    T1]  driver_register+0x23a/0x320
[    7.712178][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.713450][    T1]  virtio_scsi_init+0x65/0xe0
[    7.714571][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.715692][    T1]  do_one_initcall+0x248/0x880
[    7.716533][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.717409][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    7.718599][    T1]  ? lockdep_hardirqs_on_prepare+0x43d/0x780
[    7.719639][    T1]  ? __pfx_parse_args+0x10/0x10
[    7.720523][    T1]  ? do_initcalls+0x1c/0x80
[    7.721261][    T1]  ? rcu_is_watching+0x15/0xb0
[    7.722428][    T1]  do_initcall_level+0x157/0x210
[    7.723278][    T1]  do_initcalls+0x3f/0x80
[    7.723962][    T1]  kernel_init_freeable+0x435/0x5d0
[    7.725035][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    7.726103][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    7.727205][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.728033][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.729046][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.729731][    T1]  kernel_init+0x1d/0x2b0
[    7.730411][    T1]  ret_from_fork+0x4b/0x80
[    7.731117][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.731836][    T1]  ret_from_fork_asm+0x1a/0x30
[    7.732580][    T1]  </TASK>
[    7.733103][    T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[    7.734198][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc1-syzkaller-00060-g889914b5c209 #0
[    7.734971][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[    7.734971][    T1] Call Trace:
[    7.734971][    T1]  <TASK>
[    7.734971][    T1]  dump_stack_lvl+0x241/0x360
[    7.734971][    T1]  ? __pfx_dump_stack_lvl+0x10/0x10
[    7.734971][    T1]  ? __pfx__printk+0x10/0x10
[    7.734971][    T1]  ? _printk+0xd5/0x120
[    7.734971][    T1]  ? vscnprintf+0x5d/0x90
[    7.734971][    T1]  panic+0x349/0x860
[    7.734971][    T1]  ? __warn+0x172/0x4e0
[    7.734971][    T1]  ? __pfx_panic+0x10/0x10
[    7.734971][    T1]  ? show_trace_log_lvl+0x4e6/0x520
[    7.734971][    T1]  ? ret_from_fork_asm+0x1a/0x30
[    7.734971][    T1]  __warn+0x346/0x4e0
[    7.734971][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.734971][    T1]  report_bug+0x2b3/0x500
[    7.734971][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.734971][    T1]  handle_bug+0x3e/0x70
[    7.734971][    T1]  exc_invalid_op+0x1a/0x50
[    7.734971][    T1]  asm_exc_invalid_op+0x1a/0x20
[    7.734971][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    7.734971][    T1] Code: b2 00 00 00 e8 67 52 f2 fc 5b 5d c3 cc cc cc cc e8 5b 52 f2 fc c6 05 51 cc ce 0a 01 90 48 c7 c7 a0 54 fe 8b e8 b7 d0 b4 fc 90 <0f> 0b 90 90 eb d9 e8 3b 52 f2 fc c6 05 2e cc ce 0a 01 90 48 c7 c7
[    7.734971][    T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[    7.734971][    T1] RAX: 343580cc97689700 RBX: ffff8881401bf06c RCX: ffff8880166c8000
[    7.734971][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    7.734971][    T1] RBP: 0000000000000004 R08: ffffffff8157ffe2 R09: fffffbfff1bf96e0
[    7.734971][    T1] R10: dffffc0000000000 R11: fffffbfff1bf96e0 R12: ffffea000501cdc0
[    7.734971][    T1] R13: ffffea000501cdc8 R14: 1ffffd4000a039b9 R15: 0000000000000000
[    7.734971][    T1]  ? __warn_printk+0x292/0x360
[    7.734971][    T1]  ? refcount_warn_saturate+0xf9/0x1d0
[    7.734971][    T1]  __free_pages_ok+0xc54/0xd80
[    7.734971][    T1]  make_alloc_exact+0xa3/0xf0
[    7.734971][    T1]  vring_alloc_queue_split+0x20a/0x600
[    7.734971][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    7.734971][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    7.734971][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    7.734971][    T1]  ? virtio_dev_probe+0x991/0xaf0
[    7.734971][    T1]  ? really_probe+0x2b8/0xad0
[    7.734971][    T1]  ? driver_probe_device+0x50/0x430
[    7.734971][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    7.734971][    T1]  ? ret_from_fork+0x4b/0x80
[    7.734971][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    7.734971][    T1]  vring_create_virtqueue+0xca/0x110
[    7.734971][    T1]  ? __pfx_vp_notify+0x10/0x10
[    7.734971][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.734971][    T1]  setup_vq+0xe9/0x2d0
[    7.734971][    T1]  ? __pfx_vp_notify+0x10/0x10
[    7.734971][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.784590][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.784590][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.784590][    T1]  vp_setup_vq+0xbf/0x330
[    7.784590][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    7.784590][    T1]  ? ioread16+0x2f/0x90
[    7.784590][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.784590][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    7.784590][    T1]  vp_find_vqs+0x4c/0x4e0
[    7.784590][    T1]  virtscsi_init+0x8db/0xd00
[    7.784590][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    7.784590][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    7.784590][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    7.784590][    T1]  ? vp_get+0xfd/0x140
[    7.784590][    T1]  virtscsi_probe+0x3ea/0xf60
[    7.784590][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    7.784590][    T1]  ? kernfs_add_one+0x156/0x8b0
[    7.784590][    T1]  ? virtio_no_restricted_mem_acc+0x9/0x10
[    7.784590][    T1]  ? virtio_features_ok+0x10c/0x270
[    7.784590][    T1]  virtio_dev_probe+0x991/0xaf0
[    7.784590][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    7.784590][    T1]  really_probe+0x2b8/0xad0
[    7.784590][    T1]  __driver_probe_device+0x1a2/0x390
[    7.784590][    T1]  driver_probe_device+0x50/0x430
[    7.784590][    T1]  __driver_attach+0x45f/0x710
[    7.784590][    T1]  ? __pfx___driver_attach+0x10/0x10
[    7.784590][    T1]  bus_for_each_dev+0x239/0x2b0
[    7.784590][    T1]  ? __pfx___driver_attach+0x10/0x10
[    7.784590][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    7.784590][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    7.784590][    T1]  bus_add_driver+0x347/0x620
[    7.784590][    T1]  driver_register+0x23a/0x320
[    7.784590][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.784590][    T1]  virtio_scsi_init+0x65/0xe0
[    7.784590][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.784590][    T1]  do_one_initcall+0x248/0x880
[    7.784590][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.784590][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    7.784590][    T1]  ? lockdep_hardirqs_on_prepare+0x43d/0x780
[    7.784590][    T1]  ? __pfx_parse_args+0x10/0x10
[    7.784590][    T1]  ? do_initcalls+0x1c/0x80
[    7.784590][    T1]  ? rcu_is_watching+0x15/0xb0
[    7.784590][    T1]  do_initcall_level+0x157/0x210
[    7.784590][    T1]  do_initcalls+0x3f/0x80
[    7.784590][    T1]  kernel_init_freeable+0x435/0x5d0
[    7.784590][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    7.784590][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    7.784590][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.784590][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.784590][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.784590][    T1]  kernel_init+0x1d/0x2b0
[    7.784590][    T1]  ret_from_fork+0x4b/0x80
[    7.784590][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.784590][    T1]  ret_from_fork_asm+0x1a/0x30
[    7.834581][    T1]  </TASK>
[    7.834581][    T1] Kernel Offset: disabled
[    7.834581][    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-build686088701=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at 610f2a54d
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=610f2a54d02f8cf4f2454c03bf679b602e6e59b6 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240503-155746'" "-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=610f2a54d02f8cf4f2454c03bf679b602e6e59b6 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240503-155746'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=610f2a54d02f8cf4f2454c03bf679b602e6e59b6 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240503-155746'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -std=c++11 -I. -Ivendor -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=\"610f2a54d02f8cf4f2454c03bf679b602e6e59b6\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=1233c3ec980000


Tested on:

commit:         889914b5 f2fs: fix to cover read extent cache access w..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git wip
kernel config:  https://syzkaller.appspot.com/x/.config?x=1ace29459a0a1915
dashboard link: https://syzkaller.appspot.com/bug?extid=74ebe2104433e9dc610d
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.

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