Date: Sat, 17 Feb 2024 03:23:03 -0800
From: syzbot <syzbot+1683f76f1b20b826de67@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Write in
 hci_conn_drop (2)

Hello,

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

st device registered (name=vmci, major=10, minor=118)
[    7.646156][    T1] Initialized host personality
[    7.647936][    T1] usbcore: registered new interface driver rtsx_usb
[    7.649988][    T1] usbcore: registered new interface driver viperboard
[    7.651838][    T1] usbcore: registered new interface driver dln2
[    7.653834][    T1] usbcore: registered new interface driver pn533_usb
[    7.664347][    T1] nfcsim 0.2 initialized
[    7.665691][    T1] usbcore: registered new interface driver port100
[    7.668533][    T1] usbcore: registered new interface driver nfcmrvl
[    7.675630][    T1] Loading iSCSI transport class v2.0-870.
[    7.698216][    T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues
[    7.709913][    T1] ------------[ cut here ]------------
[    7.711179][    T1] refcount_t: decrement hit 0; leaking memory.
[    7.712836][    T1] WARNING: CPU: 0 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0
[    7.715358][    T1] Modules linked in:
[    7.716481][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc4-next-20240216-syzkaller-07658-gd37e1e4c52bc-dirty #0
[    7.719681][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
[    7.722153][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    7.723825][    T1] Code: b2 00 00 00 e8 b7 94 f0 fc 5b 5d c3 cc cc cc cc e8 ab 94 f0 fc c6 05 c6 16 ce 0a 01 90 48 c7 c7 a0 5a fe 8b e8 67 69 b4 fc 90 <0f> 0b 90 90 eb d9 e8 8b 94 f0 fc c6 05 a3 16 ce 0a 01 90 48 c7 c7
[    7.728144][    T1] RSP: 0000:ffffc90000066e10 EFLAGS: 00010246
[    7.729780][    T1] RAX: ca34bf339345e800 RBX: ffff888020eb0f4c RCX: ffff8880162d8000
[    7.731521][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    7.733264][    T1] RBP: 0000000000000004 R08: ffffffff8157b942 R09: fffffbfff1bf95cc
[    7.735392][    T1] R10: dffffc0000000000 R11: fffffbfff1bf95cc R12: ffffea000502ddc0
[    7.737235][    T1] R13: ffffea000502ddc8 R14: 1ffffd4000a05bb9 R15: 0000000000000000
[    7.738734][    T1] FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
[    7.741305][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    7.742963][    T1] CR2: ffff88823ffff000 CR3: 000000000df32000 CR4: 00000000003506f0
[    7.744872][    T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    7.746542][    T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    7.749418][    T1] Call Trace:
[    7.750267][    T1]  <TASK>
[    7.750946][    T1]  ? __warn+0x163/0x4b0
[    7.751918][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.752945][    T1]  ? report_bug+0x2b3/0x500
[    7.754131][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.755275][    T1]  ? handle_bug+0x3e/0x70
[    7.756610][    T1]  ? exc_invalid_op+0x1a/0x50
[    7.757756][    T1]  ? asm_exc_invalid_op+0x1a/0x20
[    7.759043][    T1]  ? __warn_printk+0x292/0x360
[    7.760038][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.761095][    T1]  __free_pages_ok+0xc42/0xd70
[    7.761887][    T1]  make_alloc_exact+0xc4/0x140
[    7.762733][    T1]  vring_alloc_queue_split+0x20a/0x600
[    7.763909][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    7.765171][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    7.765822][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    7.766497][    T1]  ? virtio_dev_probe+0x991/0xaf0
[    7.767234][    T1]  ? really_probe+0x29e/0xc50
[    7.767992][    T1]  ? driver_probe_device+0x50/0x430
[    7.769193][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    7.770403][    T1]  ? ret_from_fork+0x4b/0x80
[    7.771350][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    7.772638][    T1]  vring_create_virtqueue+0xca/0x110
[    7.773683][    T1]  ? __pfx_vp_notify+0x10/0x10
[    7.774585][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.775665][    T1]  setup_vq+0xe9/0x2d0
[    7.776917][    T1]  ? __pfx_vp_notify+0x10/0x10
[    7.778204][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.779467][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.781403][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.782743][    T1]  vp_setup_vq+0xbf/0x330
[    7.783647][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    7.784936][    T1]  ? ioread16+0x2f/0x90
[    7.785529][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.786299][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    7.787023][    T1]  vp_find_vqs+0x4c/0x4e0
[    7.788532][    T1]  virtscsi_init+0x8db/0xd00
[    7.790004][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    7.790970][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    7.792125][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    7.793057][    T1]  ? vp_get+0xfd/0x140
[    7.793938][    T1]  virtscsi_probe+0x3ea/0xf60
[    7.794992][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    7.795946][    T1]  ? kernfs_add_one+0x156/0x8b0
[    7.796940][    T1]  ? virtio_no_restricted_mem_acc+0x9/0x10
[    7.798029][    T1]  ? virtio_features_ok+0x10c/0x270
[    7.799045][    T1]  virtio_dev_probe+0x991/0xaf0
[    7.800155][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    7.801103][    T1]  really_probe+0x29e/0xc50
[    7.802608][    T1]  __driver_probe_device+0x1a2/0x3e0
[    7.803793][    T1]  driver_probe_device+0x50/0x430
[    7.804857][    T1]  __driver_attach+0x45f/0x710
[    7.805550][    T1]  ? __pfx___driver_attach+0x10/0x10
[    7.806333][    T1]  bus_for_each_dev+0x239/0x2b0
[    7.807759][    T1]  ? __pfx___driver_attach+0x10/0x10
[    7.808888][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    7.809993][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    7.811278][    T1]  bus_add_driver+0x347/0x620
[    7.812206][    T1]  driver_register+0x23a/0x320
[    7.813748][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.815079][    T1]  virtio_scsi_init+0x65/0xe0
[    7.816135][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.817203][    T1]  do_one_initcall+0x238/0x830
[    7.818686][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.819999][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    7.821171][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    7.822983][    T1]  ? __pfx_parse_args+0x10/0x10
[    7.823803][    T1]  ? do_initcalls+0x1c/0x80
[    7.825039][    T1]  ? rcu_is_watching+0x15/0xb0
[    7.825767][    T1]  do_initcall_level+0x157/0x210
[    7.827178][    T1]  do_initcalls+0x3f/0x80
[    7.828780][    T1]  kernel_init_freeable+0x435/0x5d0
[    7.829898][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    7.831154][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    7.833103][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.834732][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.835783][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.836738][    T1]  kernel_init+0x1d/0x2b0
[    7.837904][    T1]  ret_from_fork+0x4b/0x80
[    7.838532][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.839490][    T1]  ret_from_fork_asm+0x1a/0x30
[    7.840865][    T1]  </TASK>
[    7.842221][    T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[    7.844095][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc4-next-20240216-syzkaller-07658-gd37e1e4c52bc-dirty #0
[    7.844711][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
[    7.844711][    T1] Call Trace:
[    7.844711][    T1]  <TASK>
[    7.844711][    T1]  dump_stack_lvl+0x241/0x360
[    7.844711][    T1]  ? __pfx_dump_stack_lvl+0x10/0x10
[    7.844711][    T1]  ? __pfx__printk+0x10/0x10
[    7.844711][    T1]  ? _printk+0xd5/0x120
[    7.844711][    T1]  ? vscnprintf+0x5d/0x90
[    7.844711][    T1]  panic+0x349/0x860
[    7.844711][    T1]  ? __warn+0x172/0x4b0
[    7.844711][    T1]  ? __pfx_panic+0x10/0x10
[    7.844711][    T1]  ? show_trace_log_lvl+0x4e6/0x520
[    7.844711][    T1]  ? ret_from_fork_asm+0x1a/0x30
[    7.844711][    T1]  __warn+0x31e/0x4b0
[    7.844711][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.844711][    T1]  report_bug+0x2b3/0x500
[    7.844711][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.844711][    T1]  handle_bug+0x3e/0x70
[    7.844711][    T1]  exc_invalid_op+0x1a/0x50
[    7.844711][    T1]  asm_exc_invalid_op+0x1a/0x20
[    7.844711][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    7.844711][    T1] Code: b2 00 00 00 e8 b7 94 f0 fc 5b 5d c3 cc cc cc cc e8 ab 94 f0 fc c6 05 c6 16 ce 0a 01 90 48 c7 c7 a0 5a fe 8b e8 67 69 b4 fc 90 <0f> 0b 90 90 eb d9 e8 8b 94 f0 fc c6 05 a3 16 ce 0a 01 90 48 c7 c7
[    7.844711][    T1] RSP: 0000:ffffc90000066e10 EFLAGS: 00010246
[    7.844711][    T1] RAX: ca34bf339345e800 RBX: ffff888020eb0f4c RCX: ffff8880162d8000
[    7.844711][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    7.844711][    T1] RBP: 0000000000000004 R08: ffffffff8157b942 R09: fffffbfff1bf95cc
[    7.844711][    T1] R10: dffffc0000000000 R11: fffffbfff1bf95cc R12: ffffea000502ddc0
[    7.844711][    T1] R13: ffffea000502ddc8 R14: 1ffffd4000a05bb9 R15: 0000000000000000
[    7.844711][    T1]  ? __warn_printk+0x292/0x360
[    7.844711][    T1]  __free_pages_ok+0xc42/0xd70
[    7.844711][    T1]  make_alloc_exact+0xc4/0x140
[    7.844711][    T1]  vring_alloc_queue_split+0x20a/0x600
[    7.844711][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    7.844711][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    7.844711][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    7.844711][    T1]  ? virtio_dev_probe+0x991/0xaf0
[    7.844711][    T1]  ? really_probe+0x29e/0xc50
[    7.844711][    T1]  ? driver_probe_device+0x50/0x430
[    7.844711][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    7.844711][    T1]  ? ret_from_fork+0x4b/0x80
[    7.844711][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    7.844711][    T1]  vring_create_virtqueue+0xca/0x110
[    7.844711][    T1]  ? __pfx_vp_notify+0x10/0x10
[    7.894210][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.894210][    T1]  setup_vq+0xe9/0x2d0
[    7.894210][    T1]  ? __pfx_vp_notify+0x10/0x10
[    7.894210][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.894210][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.894210][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.894210][    T1]  vp_setup_vq+0xbf/0x330
[    7.894210][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    7.894210][    T1]  ? ioread16+0x2f/0x90
[    7.894210][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.894210][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    7.894210][    T1]  vp_find_vqs+0x4c/0x4e0
[    7.894210][    T1]  virtscsi_init+0x8db/0xd00
[    7.894210][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    7.894210][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    7.894210][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    7.894210][    T1]  ? vp_get+0xfd/0x140
[    7.894210][    T1]  virtscsi_probe+0x3ea/0xf60
[    7.894210][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    7.894210][    T1]  ? kernfs_add_one+0x156/0x8b0
[    7.894210][    T1]  ? virtio_no_restricted_mem_acc+0x9/0x10
[    7.894210][    T1]  ? virtio_features_ok+0x10c/0x270
[    7.894210][    T1]  virtio_dev_probe+0x991/0xaf0
[    7.894210][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    7.894210][    T1]  really_probe+0x29e/0xc50
[    7.894210][    T1]  __driver_probe_device+0x1a2/0x3e0
[    7.894210][    T1]  driver_probe_device+0x50/0x430
[    7.894210][    T1]  __driver_attach+0x45f/0x710
[    7.894210][    T1]  ? __pfx___driver_attach+0x10/0x10
[    7.894210][    T1]  bus_for_each_dev+0x239/0x2b0
[    7.894210][    T1]  ? __pfx___driver_attach+0x10/0x10
[    7.894210][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    7.894210][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    7.894210][    T1]  bus_add_driver+0x347/0x620
[    7.894210][    T1]  driver_register+0x23a/0x320
[    7.894210][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.894210][    T1]  virtio_scsi_init+0x65/0xe0
[    7.894210][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.894210][    T1]  do_one_initcall+0x238/0x830
[    7.894210][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.894210][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    7.894210][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    7.894210][    T1]  ? __pfx_parse_args+0x10/0x10
[    7.894210][    T1]  ? do_initcalls+0x1c/0x80
[    7.894210][    T1]  ? rcu_is_watching+0x15/0xb0
[    7.894210][    T1]  do_initcall_level+0x157/0x210
[    7.894210][    T1]  do_initcalls+0x3f/0x80
[    7.894210][    T1]  kernel_init_freeable+0x435/0x5d0
[    7.894210][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    7.894210][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    7.894210][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.894210][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.894210][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.894210][    T1]  kernel_init+0x1d/0x2b0
[    7.894210][    T1]  ret_from_fork+0x4b/0x80
[    7.894210][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.894210][    T1]  ret_from_fork_asm+0x1a/0x30
[    7.894210][    T1]  </TASK>
[    7.894210][    T1] Kernel Offset: disabled
[    7.894210][    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/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/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/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-build2616846364=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at 578f75388
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:32: run command via tools/syz-env for best compatibility, see:
Makefile:33: 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
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=578f753887693e1375d17cf79dc1c575f6032a5d -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240215-140143'" "-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=578f753887693e1375d17cf79dc1c575f6032a5d -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240215-140143'" "-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=578f753887693e1375d17cf79dc1c575f6032a5d -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240215-140143'" "-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=\"578f753887693e1375d17cf79dc1c575f6032a5d\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=10615fc8180000


Tested on:

commit:         d37e1e4c Add linux-next specific files for 20240216
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=4bc446d42a7d56c0
dashboard link: https://syzkaller.appspot.com/bug?extid=1683f76f1b20b826de67
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13dd25d0180000

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