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Message-ID: <000000000000580ad90614bda9bd@google.com>
Date: Thu, 28 Mar 2024 12:38:02 -0700
From: syzbot <syzbot+9c0a93c676799fdf466c@...kaller.appspotmail.com>
To: brauner@...nel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fs?] WARNING: ODEBUG bug in bdev_super_lock

Hello,

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


[    9.827096][    T1] ------------[ cut here ]------------
[    9.828078][    T1] refcount_t: decrement hit 0; leaking memory.
[    9.829800][    T1] WARNING: CPU: 1 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0
[    9.831609][    T1] Modules linked in:
[    9.832246][    T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc1-syzkaller-g22650a99821d #0
[    9.833858][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
[    9.835637][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    9.836865][    T1] Code: b2 00 00 00 e8 d7 db e9 fc 5b 5d e9 d0 85 e0 06 e8 cb db e9 fc c6 05 8f 84 e8 0a 01 90 48 c7 c7 60 32 1f 8c e8 07 78 ac fc 90 <0f> 0b 90 90 eb d9 e8 ab db e9 fc c6 05 6c 84 e8 0a 01 90 48 c7 c7
[    9.840203][    T1] RSP: 0018:ffffc90000066e18 EFLAGS: 00010246
[    9.841605][    T1] RAX: 73a55f6856218c00 RBX: ffff88802101cc6c RCX: ffff8880166d0000
[    9.842848][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    9.844053][    T1] RBP: 0000000000000004 R08: ffffffff815800c2 R09: fffffbfff1c396e0
[    9.845853][    T1] R10: dffffc0000000000 R11: fffffbfff1c396e0 R12: ffffea000502cdc0
[    9.847348][    T1] R13: ffffea000502cdc8 R14: 1ffffd4000a059b9 R15: 0000000000000000
[    9.848493][    T1] FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
[    9.850332][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.851729][    T1] CR2: 0000000000000000 CR3: 000000000e132000 CR4: 0000000000350ef0
[    9.853028][    T1] Call Trace:
[    9.853740][    T1]  <TASK>
[    9.854296][    T1]  ? __warn+0x163/0x4e0
[    9.855289][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    9.856339][    T1]  ? report_bug+0x2b3/0x500
[    9.857091][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    9.858009][    T1]  ? handle_bug+0x3e/0x70
[    9.859055][    T1]  ? exc_invalid_op+0x1a/0x50
[    9.859887][    T1]  ? asm_exc_invalid_op+0x1a/0x20
[    9.860670][    T1]  ? __warn_printk+0x292/0x360
[    9.861387][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    9.862309][    T1]  ? refcount_warn_saturate+0xf9/0x1d0
[    9.863096][    T1]  __free_pages_ok+0xc60/0xd90
[    9.863791][    T1]  make_alloc_exact+0xa3/0xf0
[    9.864692][    T1]  vring_alloc_queue_split+0x20a/0x600
[    9.865642][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    9.866530][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    9.867393][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    9.868249][    T1]  ? virtio_dev_probe+0x993/0xaf0
[    9.869255][    T1]  ? really_probe+0x2ba/0xad0
[    9.869940][    T1]  ? driver_probe_device+0x50/0x430
[    9.870721][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    9.871561][    T1]  ? ret_from_fork+0x4d/0x80
[    9.872295][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    9.873627][    T1]  vring_create_virtqueue+0xca/0x110
[    9.874772][    T1]  ? __pfx_vp_notify+0x10/0x10
[    9.875523][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.876526][    T1]  setup_vq+0xe9/0x2d0
[    9.877345][    T1]  ? __pfx_vp_notify+0x10/0x10
[    9.878322][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.879538][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.880573][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.881434][    T1]  vp_setup_vq+0xc1/0x330
[    9.882087][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    9.883422][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.884655][    T1]  ? ioread16+0x2f/0x90
[    9.885417][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.886541][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    9.887569][    T1]  vp_find_vqs+0x4c/0x4e0
[    9.888212][    T1]  virtscsi_init+0x8dd/0xd00
[    9.889003][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    9.889853][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    9.890890][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.891703][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    9.892486][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.893269][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.894149][    T1]  ? vp_get+0xfd/0x140
[    9.894862][    T1]  virtscsi_probe+0x3ea/0xf60
[    9.895725][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    9.896569][    T1]  ? kernfs_add_one+0x156/0x8b0
[    9.897285][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.897970][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.898863][    T1]  ? virtio_features_ok+0x10c/0x270
[    9.899770][    T1]  virtio_dev_probe+0x993/0xaf0
[    9.900613][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    9.901586][    T1]  really_probe+0x2ba/0xad0
[    9.902274][    T1]  __driver_probe_device+0x1a2/0x390
[    9.903055][    T1]  driver_probe_device+0x50/0x430
[    9.903839][    T1]  __driver_attach+0x45f/0x710
[    9.904538][    T1]  ? __pfx___driver_attach+0x10/0x10
[    9.905334][    T1]  bus_for_each_dev+0x23b/0x2b0
[    9.906039][    T1]  ? __pfx___driver_attach+0x10/0x10
[    9.906776][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    9.907541][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    9.908385][    T1]  bus_add_driver+0x347/0x620
[    9.909339][    T1]  driver_register+0x23a/0x320
[    9.910264][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    9.911222][    T1]  virtio_scsi_init+0x65/0xe0
[    9.911916][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    9.912708][    T1]  do_one_initcall+0x24a/0x880
[    9.913383][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    9.914212][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    9.914975][    T1]  ? lockdep_hardirqs_on_prepare+0x43d/0x780
[    9.915956][    T1]  ? __pfx_parse_args+0x10/0x10
[    9.916686][    T1]  ? do_initcalls+0x1c/0x80
[    9.917333][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.918045][    T1]  ? rcu_is_watching+0x15/0xb0
[    9.918900][    T1]  do_initcall_level+0x157/0x210
[    9.919645][    T1]  do_initcalls+0x3f/0x80
[    9.920262][    T1]  kernel_init_freeable+0x435/0x5d0
[    9.921097][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    9.921899][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    9.922815][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.923507][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.924275][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.924987][    T1]  kernel_init+0x1d/0x2b0
[    9.925673][    T1]  ret_from_fork+0x4d/0x80
[    9.926323][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.927030][    T1]  ret_from_fork_asm+0x1a/0x30
[    9.927820][    T1]  </TASK>
[    9.928310][    T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[    9.928873][    T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc1-syzkaller-g22650a99821d #0
[    9.928873][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
[    9.928873][    T1] Call Trace:
[    9.928873][    T1]  <TASK>
[    9.928873][    T1]  dump_stack_lvl+0x241/0x360
[    9.928873][    T1]  ? __pfx_dump_stack_lvl+0x10/0x10
[    9.928873][    T1]  ? __pfx__printk+0x10/0x10
[    9.928873][    T1]  ? _printk+0xd5/0x120
[    9.928873][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.928873][    T1]  ? vscnprintf+0x5d/0x90
[    9.928873][    T1]  panic+0x349/0x860
[    9.928873][    T1]  ? __warn+0x172/0x4e0
[    9.928873][    T1]  ? __pfx_panic+0x10/0x10
[    9.928873][    T1]  ? show_trace_log_lvl+0x4e6/0x520
[    9.928873][    T1]  ? ret_from_fork_asm+0x1a/0x30
[    9.928873][    T1]  __warn+0x346/0x4e0
[    9.928873][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    9.928873][    T1]  report_bug+0x2b3/0x500
[    9.928873][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    9.928873][    T1]  handle_bug+0x3e/0x70
[    9.928873][    T1]  exc_invalid_op+0x1a/0x50
[    9.928873][    T1]  asm_exc_invalid_op+0x1a/0x20
[    9.928873][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    9.928873][    T1] Code: b2 00 00 00 e8 d7 db e9 fc 5b 5d e9 d0 85 e0 06 e8 cb db e9 fc c6 05 8f 84 e8 0a 01 90 48 c7 c7 60 32 1f 8c e8 07 78 ac fc 90 <0f> 0b 90 90 eb d9 e8 ab db e9 fc c6 05 6c 84 e8 0a 01 90 48 c7 c7
[    9.928873][    T1] RSP: 0018:ffffc90000066e18 EFLAGS: 00010246
[    9.928873][    T1] RAX: 73a55f6856218c00 RBX: ffff88802101cc6c RCX: ffff8880166d0000
[    9.928873][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    9.928873][    T1] RBP: 0000000000000004 R08: ffffffff815800c2 R09: fffffbfff1c396e0
[    9.928873][    T1] R10: dffffc0000000000 R11: fffffbfff1c396e0 R12: ffffea000502cdc0
[    9.928873][    T1] R13: ffffea000502cdc8 R14: 1ffffd4000a059b9 R15: 0000000000000000
[    9.928873][    T1]  ? __warn_printk+0x292/0x360
[    9.928873][    T1]  ? refcount_warn_saturate+0xf9/0x1d0
[    9.928873][    T1]  __free_pages_ok+0xc60/0xd90
[    9.928873][    T1]  make_alloc_exact+0xa3/0xf0
[    9.928873][    T1]  vring_alloc_queue_split+0x20a/0x600
[    9.928873][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    9.928873][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    9.928873][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    9.928873][    T1]  ? virtio_dev_probe+0x993/0xaf0
[    9.928873][    T1]  ? really_probe+0x2ba/0xad0
[    9.928873][    T1]  ? driver_probe_device+0x50/0x430
[    9.928873][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    9.928873][    T1]  ? ret_from_fork+0x4d/0x80
[    9.928873][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    9.928873][    T1]  vring_create_virtqueue+0xca/0x110
[    9.928873][    T1]  ? __pfx_vp_notify+0x10/0x10
[    9.928873][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.928873][    T1]  setup_vq+0xe9/0x2d0
[    9.928873][    T1]  ? __pfx_vp_notify+0x10/0x10
[    9.928873][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.928873][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.928873][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.928873][    T1]  vp_setup_vq+0xc1/0x330
[    9.928873][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    9.928873][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.928873][    T1]  ? ioread16+0x2f/0x90
[    9.928873][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    9.928873][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    9.928873][    T1]  vp_find_vqs+0x4c/0x4e0
[    9.928873][    T1]  virtscsi_init+0x8dd/0xd00
[    9.928873][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    9.928873][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    9.928873][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.928873][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    9.928873][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.928873][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.928873][    T1]  ? vp_get+0xfd/0x140
[    9.928873][    T1]  virtscsi_probe+0x3ea/0xf60
[    9.928873][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    9.928873][    T1]  ? kernfs_add_one+0x156/0x8b0
[    9.928873][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.928873][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.928873][    T1]  ? virtio_features_ok+0x10c/0x270
[    9.928873][    T1]  virtio_dev_probe+0x993/0xaf0
[    9.928873][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    9.928873][    T1]  really_probe+0x2ba/0xad0
[    9.928873][    T1]  __driver_probe_device+0x1a2/0x390
[    9.928873][    T1]  driver_probe_device+0x50/0x430
[    9.928873][    T1]  __driver_attach+0x45f/0x710
[    9.928873][    T1]  ? __pfx___driver_attach+0x10/0x10
[    9.928873][    T1]  bus_for_each_dev+0x23b/0x2b0
[    9.928873][    T1]  ? __pfx___driver_attach+0x10/0x10
[    9.928873][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    9.928873][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    9.928873][    T1]  bus_add_driver+0x347/0x620
[    9.928873][    T1]  driver_register+0x23a/0x320
[    9.928873][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    9.928873][    T1]  virtio_scsi_init+0x65/0xe0
[    9.928873][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    9.928873][    T1]  do_one_initcall+0x24a/0x880
[    9.928873][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    9.928873][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    9.928873][    T1]  ? lockdep_hardirqs_on_prepare+0x43d/0x780
[    9.928873][    T1]  ? __pfx_parse_args+0x10/0x10
[    9.928873][    T1]  ? do_initcalls+0x1c/0x80
[    9.928873][    T1]  ? srso_return_thunk+0x5/0x5f
[    9.928873][    T1]  ? rcu_is_watching+0x15/0xb0
[    9.928873][    T1]  do_initcall_level+0x157/0x210
[    9.928873][    T1]  do_initcalls+0x3f/0x80
[    9.928873][    T1]  kernel_init_freeable+0x435/0x5d0
[    9.928873][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    9.928873][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    9.928873][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.928873][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.928873][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.928873][    T1]  kernel_init+0x1d/0x2b0
[    9.928873][    T1]  ret_from_fork+0x4d/0x80
[    9.928873][    T1]  ? __pfx_kernel_init+0x10/0x10
[    9.928873][    T1]  ret_from_fork_asm+0x1a/0x30
[    9.928873][    T1]  </TASK>
[    9.928873][    T1] Kernel Offset: disabled
[    9.928873][    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-build4004819836=/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=13bf0c95180000


Tested on:

commit:         22650a99 fs,block: yield devices early
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.fixes
kernel config:  https://syzkaller.appspot.com/x/.config?x=151a91b67a261267
dashboard link: https://syzkaller.appspot.com/bug?extid=9c0a93c676799fdf466c
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.

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