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Message-ID: <000000000000abd40e0615516bdb@google.com>
Date: Thu, 04 Apr 2024 20:55:03 -0700
From: syzbot <syzbot+af9492708df9797198d6@...kaller.appspotmail.com>
To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
daniel@...earbox.net, davem@...emloft.net, eadavis@...com, eddyz87@...il.com,
haoluo@...gle.com, hawk@...nel.org, john.fastabend@...il.com,
jolsa@...nel.org, kpsingh@...nel.org, kuba@...nel.org,
linux-kernel@...r.kernel.org, martin.lau@...ux.dev, netdev@...r.kernel.org,
sdf@...gle.com, song@...nel.org, syzkaller-bugs@...glegroups.com,
toke@...nel.org, yonghong.song@...ux.dev
Subject: Re: [syzbot] [bpf?] [net?] general protection fault in dev_map_enqueue
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
erface driver port100
[ 7.311436][ T1] usbcore: registered new interface driver nfcmrvl
[ 7.318515][ T1] Loading iSCSI transport class v2.0-870.
[ 7.335287][ T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues
[ 7.343626][ T1] ------------[ cut here ]------------
[ 7.344498][ T1] refcount_t: decrement hit 0; leaking memory.
[ 7.345816][ T1] WARNING: CPU: 0 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0
[ 7.347895][ T1] Modules linked in:
[ 7.348644][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc1-syzkaller-00245-g1cfa2f10f4e9-dirty #0
[ 7.350284][ T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
[ 7.351743][ T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[ 7.352725][ T1] Code: b2 00 00 00 e8 97 cf e9 fc 5b 5d c3 cc cc cc cc e8 8b cf e9 fc c6 05 6e 74 e8 0a 01 90 48 c7 c7 e0 33 1f 8c e8 c7 6b ac fc 90 <0f> 0b 90 90 eb d9 e8 6b cf e9 fc c6 05 4b 74 e8 0a 01 90 48 c7 c7
[ 7.355628][ T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[ 7.356908][ T1] RAX: 97987c7bd8eab100 RBX: ffff8881472d6f6c RCX: ffff8880166d0000
[ 7.358339][ T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 7.359509][ T1] RBP: 0000000000000004 R08: ffffffff81580062 R09: fffffbfff1c396e0
[ 7.360660][ T1] R10: dffffc0000000000 R11: fffffbfff1c396e0 R12: ffffea0000856dc0
[ 7.361924][ T1] R13: ffffea0000856dc8 R14: 1ffffd400010adb9 R15: 0000000000000000
[ 7.363052][ T1] FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
[ 7.364304][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 7.365198][ T1] CR2: ffff88823ffff000 CR3: 000000000e132000 CR4: 00000000003506f0
[ 7.367259][ T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 7.368495][ T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 7.369779][ T1] Call Trace:
[ 7.370257][ T1] <TASK>
[ 7.370879][ T1] ? __warn+0x163/0x4e0
[ 7.371456][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 7.372221][ T1] ? report_bug+0x2b3/0x500
[ 7.372874][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 7.373951][ T1] ? handle_bug+0x3e/0x70
[ 7.374586][ T1] ? exc_invalid_op+0x1a/0x50
[ 7.375235][ T1] ? asm_exc_invalid_op+0x1a/0x20
[ 7.375940][ T1] ? __warn_printk+0x292/0x360
[ 7.376982][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 7.377792][ T1] ? refcount_warn_saturate+0xf9/0x1d0
[ 7.378630][ T1] __free_pages_ok+0xc60/0xd90
[ 7.379362][ T1] make_alloc_exact+0xa3/0xf0
[ 7.380045][ T1] vring_alloc_queue_split+0x20a/0x600
[ 7.380857][ T1] ? __pfx_vring_alloc_queue_split+0x10/0x10
[ 7.381697][ T1] ? vp_find_vqs+0x4c/0x4e0
[ 7.382711][ T1] ? virtscsi_probe+0x3ea/0xf60
[ 7.383786][ T1] ? virtio_dev_probe+0x991/0xaf0
[ 7.384631][ T1] ? really_probe+0x2b8/0xad0
[ 7.385324][ T1] ? driver_probe_device+0x50/0x430
[ 7.386103][ T1] vring_create_virtqueue_split+0xc6/0x310
[ 7.387313][ T1] ? ret_from_fork+0x4b/0x80
[ 7.388031][ T1] ? __pfx_vring_create_virtqueue_split+0x10/0x10
[ 7.389084][ T1] vring_create_virtqueue+0xca/0x110
[ 7.389967][ T1] ? __pfx_vp_notify+0x10/0x10
[ 7.390812][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.391660][ T1] setup_vq+0xe9/0x2d0
[ 7.392432][ T1] ? __pfx_vp_notify+0x10/0x10
[ 7.393181][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.393942][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.394867][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.395927][ T1] vp_setup_vq+0xbf/0x330
[ 7.397180][ T1] ? __pfx_vp_config_changed+0x10/0x10
[ 7.398233][ T1] ? ioread16+0x2f/0x90
[ 7.398859][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.399621][ T1] vp_find_vqs_msix+0x8b2/0xc80
[ 7.400563][ T1] vp_find_vqs+0x4c/0x4e0
[ 7.401171][ T1] virtscsi_init+0x8db/0xd00
[ 7.401888][ T1] ? __pfx_virtscsi_init+0x10/0x10
[ 7.402696][ T1] ? __pfx_default_calc_sets+0x10/0x10
[ 7.403594][ T1] ? scsi_host_alloc+0xa57/0xea0
[ 7.404281][ T1] ? vp_get+0xfd/0x140
[ 7.404929][ T1] virtscsi_probe+0x3ea/0xf60
[ 7.405637][ T1] ? __pfx_virtscsi_probe+0x10/0x10
[ 7.406398][ T1] ? virtio_pci_modern_probe+0x1ad/0x270
[ 7.407182][ T1] ? __pfx_vp_set_status+0x10/0x10
[ 7.407898][ T1] ? vp_set_status+0x1a/0x40
[ 7.408529][ T1] ? virtio_no_restricted_mem_acc+0x9/0x10
[ 7.409355][ T1] ? virtio_features_ok+0x10c/0x270
[ 7.410072][ T1] virtio_dev_probe+0x991/0xaf0
[ 7.410754][ T1] ? __pfx_virtio_dev_probe+0x10/0x10
[ 7.411546][ T1] really_probe+0x2b8/0xad0
[ 7.412167][ T1] __driver_probe_device+0x1a2/0x390
[ 7.412887][ T1] driver_probe_device+0x50/0x430
[ 7.413590][ T1] __driver_attach+0x45f/0x710
[ 7.414237][ T1] ? __pfx___driver_attach+0x10/0x10
[ 7.414953][ T1] bus_for_each_dev+0x239/0x2b0
[ 7.415674][ T1] ? __pfx___driver_attach+0x10/0x10
[ 7.416541][ T1] ? __pfx_bus_for_each_dev+0x10/0x10
[ 7.417323][ T1] ? do_raw_spin_unlock+0x13c/0x8b0
[ 7.418091][ T1] bus_add_driver+0x347/0x620
[ 7.418770][ T1] driver_register+0x23a/0x320
[ 7.419601][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 7.420387][ T1] virtio_scsi_init+0x65/0xe0
[ 7.421063][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 7.421802][ T1] do_one_initcall+0x248/0x880
[ 7.422452][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 7.423191][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[ 7.424043][ T1] ? __pfx_do_one_initcall+0x10/0x10
[ 7.424842][ T1] ? __pfx_parse_args+0x10/0x10
[ 7.425562][ T1] ? do_initcalls+0x1c/0x80
[ 7.426235][ T1] ? rcu_is_watching+0x15/0xb0
[ 7.426902][ T1] do_initcall_level+0x157/0x210
[ 7.427580][ T1] do_initcalls+0x3f/0x80
[ 7.428174][ T1] kernel_init_freeable+0x435/0x5d0
[ 7.428912][ T1] ? __pfx_kernel_init_freeable+0x10/0x10
[ 7.429687][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[ 7.430608][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.431281][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.432008][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.432791][ T1] kernel_init+0x1d/0x2b0
[ 7.433667][ T1] ret_from_fork+0x4b/0x80
[ 7.434410][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.435247][ T1] ret_from_fork_asm+0x1a/0x30
[ 7.436036][ T1] </TASK>
[ 7.436777][ T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 7.437767][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc1-syzkaller-00245-g1cfa2f10f4e9-dirty #0
[ 7.439106][ T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
[ 7.440461][ T1] Call Trace:
[ 7.440914][ T1] <TASK>
[ 7.441323][ T1] dump_stack_lvl+0x241/0x360
[ 7.441989][ T1] ? __pfx_dump_stack_lvl+0x10/0x10
[ 7.442706][ T1] ? __pfx__printk+0x10/0x10
[ 7.443350][ T1] ? _printk+0xd5/0x120
[ 7.443977][ T1] ? vscnprintf+0x5d/0x90
[ 7.444934][ T1] panic+0x349/0x860
[ 7.445694][ T1] ? __warn+0x172/0x4e0
[ 7.446290][ T1] ? __pfx_panic+0x10/0x10
[ 7.446639][ T1] ? show_trace_log_lvl+0x4e6/0x520
[ 7.446639][ T1] ? ret_from_fork_asm+0x1a/0x30
[ 7.446639][ T1] __warn+0x346/0x4e0
[ 7.446639][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 7.446639][ T1] report_bug+0x2b3/0x500
[ 7.446639][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 7.446639][ T1] handle_bug+0x3e/0x70
[ 7.446639][ T1] exc_invalid_op+0x1a/0x50
[ 7.446639][ T1] asm_exc_invalid_op+0x1a/0x20
[ 7.446639][ T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[ 7.446639][ T1] Code: b2 00 00 00 e8 97 cf e9 fc 5b 5d c3 cc cc cc cc e8 8b cf e9 fc c6 05 6e 74 e8 0a 01 90 48 c7 c7 e0 33 1f 8c e8 c7 6b ac fc 90 <0f> 0b 90 90 eb d9 e8 6b cf e9 fc c6 05 4b 74 e8 0a 01 90 48 c7 c7
[ 7.446639][ T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[ 7.446639][ T1] RAX: 97987c7bd8eab100 RBX: ffff8881472d6f6c RCX: ffff8880166d0000
[ 7.446639][ T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 7.446639][ T1] RBP: 0000000000000004 R08: ffffffff81580062 R09: fffffbfff1c396e0
[ 7.446639][ T1] R10: dffffc0000000000 R11: fffffbfff1c396e0 R12: ffffea0000856dc0
[ 7.446639][ T1] R13: ffffea0000856dc8 R14: 1ffffd400010adb9 R15: 0000000000000000
[ 7.446639][ T1] ? __warn_printk+0x292/0x360
[ 7.446639][ T1] ? refcount_warn_saturate+0xf9/0x1d0
[ 7.446639][ T1] __free_pages_ok+0xc60/0xd90
[ 7.446639][ T1] make_alloc_exact+0xa3/0xf0
[ 7.446639][ T1] vring_alloc_queue_split+0x20a/0x600
[ 7.446639][ T1] ? __pfx_vring_alloc_queue_split+0x10/0x10
[ 7.446639][ T1] ? vp_find_vqs+0x4c/0x4e0
[ 7.446639][ T1] ? virtscsi_probe+0x3ea/0xf60
[ 7.446639][ T1] ? virtio_dev_probe+0x991/0xaf0
[ 7.446639][ T1] ? really_probe+0x2b8/0xad0
[ 7.446639][ T1] ? driver_probe_device+0x50/0x430
[ 7.446639][ T1] vring_create_virtqueue_split+0xc6/0x310
[ 7.446639][ T1] ? ret_from_fork+0x4b/0x80
[ 7.446639][ T1] ? __pfx_vring_create_virtqueue_split+0x10/0x10
[ 7.446639][ T1] vring_create_virtqueue+0xca/0x110
[ 7.446639][ T1] ? __pfx_vp_notify+0x10/0x10
[ 7.446639][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.446639][ T1] setup_vq+0xe9/0x2d0
[ 7.446639][ T1] ? __pfx_vp_notify+0x10/0x10
[ 7.446639][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.446639][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.446639][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.446639][ T1] vp_setup_vq+0xbf/0x330
[ 7.446639][ T1] ? __pfx_vp_config_changed+0x10/0x10
[ 7.446639][ T1] ? ioread16+0x2f/0x90
[ 7.446639][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 7.446639][ T1] vp_find_vqs_msix+0x8b2/0xc80
[ 7.446639][ T1] vp_find_vqs+0x4c/0x4e0
[ 7.446639][ T1] virtscsi_init+0x8db/0xd00
[ 7.446639][ T1] ? __pfx_virtscsi_init+0x10/0x10
[ 7.446639][ T1] ? __pfx_default_calc_sets+0x10/0x10
[ 7.446639][ T1] ? scsi_host_alloc+0xa57/0xea0
[ 7.446639][ T1] ? vp_get+0xfd/0x140
[ 7.446639][ T1] virtscsi_probe+0x3ea/0xf60
[ 7.446639][ T1] ? __pfx_virtscsi_probe+0x10/0x10
[ 7.446639][ T1] ? virtio_pci_modern_probe+0x1ad/0x270
[ 7.446639][ T1] ? __pfx_vp_set_status+0x10/0x10
[ 7.446639][ T1] ? vp_set_status+0x1a/0x40
[ 7.446639][ T1] ? virtio_no_restricted_mem_acc+0x9/0x10
[ 7.446639][ T1] ? virtio_features_ok+0x10c/0x270
[ 7.446639][ T1] virtio_dev_probe+0x991/0xaf0
[ 7.446639][ T1] ? __pfx_virtio_dev_probe+0x10/0x10
[ 7.446639][ T1] really_probe+0x2b8/0xad0
[ 7.446639][ T1] __driver_probe_device+0x1a2/0x390
[ 7.496320][ T1] driver_probe_device+0x50/0x430
[ 7.496320][ T1] __driver_attach+0x45f/0x710
[ 7.496320][ T1] ? __pfx___driver_attach+0x10/0x10
[ 7.496320][ T1] bus_for_each_dev+0x239/0x2b0
[ 7.496320][ T1] ? __pfx___driver_attach+0x10/0x10
[ 7.496320][ T1] ? __pfx_bus_for_each_dev+0x10/0x10
[ 7.496320][ T1] ? do_raw_spin_unlock+0x13c/0x8b0
[ 7.496320][ T1] bus_add_driver+0x347/0x620
[ 7.496320][ T1] driver_register+0x23a/0x320
[ 7.496320][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 7.496320][ T1] virtio_scsi_init+0x65/0xe0
[ 7.496320][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 7.496320][ T1] do_one_initcall+0x248/0x880
[ 7.496320][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 7.496320][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[ 7.496320][ T1] ? __pfx_do_one_initcall+0x10/0x10
[ 7.496320][ T1] ? __pfx_parse_args+0x10/0x10
[ 7.496320][ T1] ? do_initcalls+0x1c/0x80
[ 7.496320][ T1] ? rcu_is_watching+0x15/0xb0
[ 7.496320][ T1] do_initcall_level+0x157/0x210
[ 7.496320][ T1] do_initcalls+0x3f/0x80
[ 7.496320][ T1] kernel_init_freeable+0x435/0x5d0
[ 7.496320][ T1] ? __pfx_kernel_init_freeable+0x10/0x10
[ 7.496320][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[ 7.496320][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.496320][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.496320][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.496320][ T1] kernel_init+0x1d/0x2b0
[ 7.496320][ T1] ret_from_fork+0x4b/0x80
[ 7.496320][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.496320][ T1] ret_from_fork_asm+0x1a/0x30
[ 7.496320][ T1] </TASK>
[ 7.496320][ T1] Kernel Offset: disabled
[ 7.496320][ 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-build2839934155=/tmp/go-build -gno-record-gcc-switches'
git status (err=<nil>)
HEAD detached at 454571b6a
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=454571b6a16598f5a6e015b9fb1a04932bce7ab9 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240326-163935'" "-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=454571b6a16598f5a6e015b9fb1a04932bce7ab9 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240326-163935'" "-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=454571b6a16598f5a6e015b9fb1a04932bce7ab9 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240326-163935'" "-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 -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=\"454571b6a16598f5a6e015b9fb1a04932bce7ab9\"
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=17196223180000
Tested on:
commit: 1cfa2f10 Merge tag 'for-netdev' of https://git.kernel...
git tree: net
kernel config: https://syzkaller.appspot.com/x/.config?x=7b667bc37450fdcd
dashboard link: https://syzkaller.appspot.com/bug?extid=af9492708df9797198d6
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=11cdcca9180000
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