Date: Fri, 08 Mar 2024 17:32:01 -0800
From: syzbot <syzbot+e5167d7144a62715044c@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [netfilter?] KASAN: slab-use-after-free Read in ip_skb_dst_mtu

Hello,

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

sbcore: registered new interface driver dln2
[    8.758756][    T1] usbcore: registered new interface driver pn533_usb
[    8.766300][    T1] nfcsim 0.2 initialized
[    8.767501][    T1] usbcore: registered new interface driver port100
[    8.769021][    T1] usbcore: registered new interface driver nfcmrvl
[    8.777559][    T1] Loading iSCSI transport class v2.0-870.
[    8.798614][    T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues
[    8.809823][    T1] ------------[ cut here ]------------
[    8.810772][    T1] refcount_t: decrement hit 0; leaking memory.
[    8.812057][    T1] WARNING: CPU: 0 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0
[    8.813796][    T1] Modules linked in:
[    8.814366][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc7-next-20240308-syzkaller-g8ffc8b1bbd50-dirty #0
[    8.816583][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
[    8.821133][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    8.822500][    T1] Code: b2 00 00 00 e8 a7 e3 ec fc 5b 5d c3 cc cc cc cc e8 9b e3 ec fc c6 05 16 be ea 0a 01 90 48 c7 c7 60 ab 1e 8c e8 17 b9 af fc 90 <0f> 0b 90 90 eb d9 e8 7b e3 ec fc c6 05 f3 bd ea 0a 01 90 48 c7 c7
[    8.825856][    T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[    8.826703][    T1] RAX: f37710c6fdfb4400 RBX: ffff8881472e256c RCX: ffff8880166d8000
[    8.828285][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    8.829591][    T1] RBP: 0000000000000004 R08: ffffffff8157d172 R09: fffffbfff1c39614
[    8.831826][    T1] R10: dffffc0000000000 R11: fffffbfff1c39614 R12: ffffea0000851dc0
[    8.833304][    T1] R13: ffffea0000851dc8 R14: 1ffffd400010a3b9 R15: 0000000000000000
[    8.834541][    T1] FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
[    8.836062][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.837282][    T1] CR2: ffff88823ffff000 CR3: 000000000e132000 CR4: 00000000003506f0
[    8.839016][    T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    8.840940][    T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    8.842607][    T1] Call Trace:
[    8.843365][    T1]  <TASK>
[    8.843855][    T1]  ? __warn+0x163/0x4b0
[    8.844635][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.846182][    T1]  ? report_bug+0x2b3/0x500
[    8.847620][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.848738][    T1]  ? handle_bug+0x3e/0x70
[    8.849656][    T1]  ? exc_invalid_op+0x1a/0x50
[    8.851094][    T1]  ? asm_exc_invalid_op+0x1a/0x20
[    8.852147][    T1]  ? __warn_printk+0x292/0x360
[    8.853031][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.853917][    T1]  ? refcount_warn_saturate+0xf9/0x1d0
[    8.854722][    T1]  __free_pages_ok+0xc42/0xd70
[    8.855417][    T1]  make_alloc_exact+0xa3/0xf0
[    8.856076][    T1]  vring_alloc_queue_split+0x20a/0x600
[    8.856911][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    8.857795][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    8.858505][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    8.859456][    T1]  ? virtio_dev_probe+0x991/0xaf0
[    8.860939][    T1]  ? really_probe+0x29e/0xc50
[    8.862246][    T1]  ? driver_probe_device+0x50/0x430
[    8.863277][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    8.864213][    T1]  ? ret_from_fork+0x4b/0x80
[    8.864929][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    8.865989][    T1]  vring_create_virtqueue+0xca/0x110
[    8.867234][    T1]  ? __pfx_vp_notify+0x10/0x10
[    8.868277][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.869236][    T1]  setup_vq+0xe9/0x2d0
[    8.869960][    T1]  ? __pfx_vp_notify+0x10/0x10
[    8.870658][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.871551][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.872622][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.873697][    T1]  vp_setup_vq+0xbf/0x330
[    8.874450][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    8.875667][    T1]  ? ioread16+0x2f/0x90
[    8.876346][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.877234][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    8.878105][    T1]  vp_find_vqs+0x4c/0x4e0
[    8.879082][    T1]  virtscsi_init+0x8db/0xd00
[    8.880685][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    8.882808][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    8.883806][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    8.885078][    T1]  ? vp_get+0xfd/0x140
[    8.886204][    T1]  virtscsi_probe+0x3ea/0xf60
[    8.887594][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    8.888451][    T1]  ? kernfs_add_one+0x156/0x8b0
[    8.889293][    T1]  ? virtio_no_restricted_mem_acc+0x9/0x10
[    8.890605][    T1]  ? virtio_features_ok+0x10c/0x270
[    8.891781][    T1]  virtio_dev_probe+0x991/0xaf0
[    8.893220][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    8.894284][    T1]  really_probe+0x29e/0xc50
[    8.895013][    T1]  __driver_probe_device+0x1a2/0x3e0
[    8.896119][    T1]  driver_probe_device+0x50/0x430
[    8.897148][    T1]  __driver_attach+0x45f/0x710
[    8.898234][    T1]  ? __pfx___driver_attach+0x10/0x10
[    8.899310][    T1]  bus_for_each_dev+0x239/0x2b0
[    8.900535][    T1]  ? __pfx___driver_attach+0x10/0x10
[    8.902736][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    8.903955][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    8.905323][    T1]  bus_add_driver+0x347/0x620
[    8.906778][    T1]  driver_register+0x23a/0x320
[    8.907994][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.909607][    T1]  virtio_scsi_init+0x65/0xe0
[    8.910777][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.912214][    T1]  do_one_initcall+0x238/0x830
[    8.913543][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.914984][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    8.916819][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    8.917969][    T1]  ? __pfx_parse_args+0x10/0x10
[    8.919098][    T1]  ? do_initcalls+0x1c/0x80
[    8.919909][    T1]  ? rcu_is_watching+0x15/0xb0
[    8.920983][    T1]  do_initcall_level+0x157/0x210
[    8.922112][    T1]  do_initcalls+0x3f/0x80
[    8.923091][    T1]  kernel_init_freeable+0x435/0x5d0
[    8.924601][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    8.926232][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    8.928164][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.929328][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.930562][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.931742][    T1]  kernel_init+0x1d/0x2b0
[    8.932479][    T1]  ret_from_fork+0x4b/0x80
[    8.933443][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.934667][    T1]  ret_from_fork_asm+0x1a/0x30
[    8.936510][    T1]  </TASK>
[    8.937427][    T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[    8.939173][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc7-next-20240308-syzkaller-g8ffc8b1bbd50-dirty #0
[    8.942655][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
[    8.945439][    T1] Call Trace:
[    8.946072][    T1]  <TASK>
[    8.946896][    T1]  dump_stack_lvl+0x241/0x360
[    8.947396][    T1]  ? __pfx_dump_stack_lvl+0x10/0x10
[    8.947396][    T1]  ? __pfx__printk+0x10/0x10
[    8.947396][    T1]  ? _printk+0xd5/0x120
[    8.947396][    T1]  ? vscnprintf+0x5d/0x90
[    8.947396][    T1]  panic+0x349/0x860
[    8.947396][    T1]  ? __warn+0x172/0x4b0
[    8.947396][    T1]  ? __pfx_panic+0x10/0x10
[    8.957077][    T1]  ? show_trace_log_lvl+0x4e6/0x520
[    8.957077][    T1]  ? ret_from_fork_asm+0x1a/0x30
[    8.957077][    T1]  __warn+0x31e/0x4b0
[    8.957077][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.957077][    T1]  report_bug+0x2b3/0x500
[    8.957077][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.957077][    T1]  handle_bug+0x3e/0x70
[    8.967207][    T1]  exc_invalid_op+0x1a/0x50
[    8.967207][    T1]  asm_exc_invalid_op+0x1a/0x20
[    8.967207][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    8.967207][    T1] Code: b2 00 00 00 e8 a7 e3 ec fc 5b 5d c3 cc cc cc cc e8 9b e3 ec fc c6 05 16 be ea 0a 01 90 48 c7 c7 60 ab 1e 8c e8 17 b9 af fc 90 <0f> 0b 90 90 eb d9 e8 7b e3 ec fc c6 05 f3 bd ea 0a 01 90 48 c7 c7
[    8.977080][    T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[    8.977080][    T1] RAX: f37710c6fdfb4400 RBX: ffff8881472e256c RCX: ffff8880166d8000
[    8.977080][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    8.977080][    T1] RBP: 0000000000000004 R08: ffffffff8157d172 R09: fffffbfff1c39614
[    8.977080][    T1] R10: dffffc0000000000 R11: fffffbfff1c39614 R12: ffffea0000851dc0
[    8.977080][    T1] R13: ffffea0000851dc8 R14: 1ffffd400010a3b9 R15: 0000000000000000
[    8.987200][    T1]  ? __warn_printk+0x292/0x360
[    8.987200][    T1]  ? refcount_warn_saturate+0xf9/0x1d0
[    8.987200][    T1]  __free_pages_ok+0xc42/0xd70
[    8.987200][    T1]  make_alloc_exact+0xa3/0xf0
[    8.987200][    T1]  vring_alloc_queue_split+0x20a/0x600
[    8.987200][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    8.987200][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    8.987200][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    8.987200][    T1]  ? virtio_dev_probe+0x991/0xaf0
[    8.997075][    T1]  ? really_probe+0x29e/0xc50
[    8.997075][    T1]  ? driver_probe_device+0x50/0x430
[    8.997075][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    8.997075][    T1]  ? ret_from_fork+0x4b/0x80
[    8.997075][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    8.997075][    T1]  vring_create_virtqueue+0xca/0x110
[    8.997075][    T1]  ? __pfx_vp_notify+0x10/0x10
[    8.997075][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.997075][    T1]  setup_vq+0xe9/0x2d0
[    8.997075][    T1]  ? __pfx_vp_notify+0x10/0x10
[    9.007200][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.007200][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.007200][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.007200][    T1]  vp_setup_vq+0xbf/0x330
[    9.007200][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    9.007200][    T1]  ? ioread16+0x2f/0x90
[    9.007200][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.007200][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    9.007200][    T1]  vp_find_vqs+0x4c/0x4e0
[    9.017081][    T1]  virtscsi_init+0x8db/0xd00
[    9.017081][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    9.017081][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    9.017081][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    9.017081][    T1]  ? vp_get+0xfd/0x140
[    9.017081][    T1]  virtscsi_probe+0x3ea/0xf60
[    9.017081][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    9.027229][    T1]  ? kernfs_add_one+0x156/0x8b0
[    9.027229][    T1]  ? virtio_no_restricted_mem_acc+0x9/0x10
[    9.027229][    T1]  ? virtio_features_ok+0x10c/0x270
[    9.027229][    T1]  virtio_dev_probe+0x991/0xaf0
[    9.027229][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    9.027229][    T1]  really_probe+0x29e/0xc50
[    9.027229][    T1]  __driver_probe_device+0x1a2/0x3e0
[    9.037078][    T1]  driver_probe_device+0x50/0x430
[    9.037078][    T1]  __driver_attach+0x45f/0x710
[    9.037078][    T1]  ? __pfx___driver_attach+0x10/0x10
[    9.037078][    T1]  bus_for_each_dev+0x239/0x2b0
[    9.037078][    T1]  ? __pfx___driver_attach+0x10/0x10
[    9.037078][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    9.037078][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    9.037078][    T1]  bus_add_driver+0x347/0x620
[    9.037078][    T1]  driver_register+0x23a/0x320
[    9.047213][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    9.047213][    T1]  virtio_scsi_init+0x65/0xe0
[    9.047213][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    9.047213][    T1]  do_one_initcall+0x238/0x830
[    9.047213][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    9.047213][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    9.047213][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    9.047213][    T1]  ? __pfx_parse_args+0x10/0x10
[    9.057088][    T1]  ? do_initcalls+0x1c/0x80
[    9.057088][    T1]  ? rcu_is_watching+0x15/0xb0
[    9.057088][    T1]  do_initcall_level+0x157/0x210
[    9.057088][    T1]  do_initcalls+0x3f/0x80
[    9.057088][    T1]  kernel_init_freeable+0x435/0x5d0
[    9.057088][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    9.057088][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    9.057088][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.067209][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.067209][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.067209][    T1]  kernel_init+0x1d/0x2b0
[    9.067209][    T1]  ret_from_fork+0x4b/0x80
[    9.067209][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.067209][    T1]  ret_from_fork_asm+0x1a/0x30
[    9.067209][    T1]  </TASK>
[    9.067209][    T1] Kernel Offset: disabled
[    9.067209][    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-build3507553695=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at 352ab9047
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=352ab9047be19ed1d8367b9113b7bde280c90124 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240228-135607'" "-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=352ab9047be19ed1d8367b9113b7bde280c90124 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240228-135607'" "-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=352ab9047be19ed1d8367b9113b7bde280c90124 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240228-135607'" "-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=\"352ab9047be19ed1d8367b9113b7bde280c90124\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=142c94da180000


Tested on:

commit:         8ffc8b1b Add linux-next specific files for 20240308
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
kernel config:  https://syzkaller.appspot.com/x/.config?x=9f21b6530bb238b3
dashboard link: https://syzkaller.appspot.com/bug?extid=e5167d7144a62715044c
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=148a3de1180000

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