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Date: Fri, 15 Mar 2024 06:34:03 -0700
From: syzbot <syzbot+f3bc6f8108108010a03d@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com, tiwai@...e.com
Subject: Re: [syzbot] [sound?] possible deadlock in snd_timer_close_locked

Hello,

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

: registered new interface driver port100
[    7.829002][    T1] usbcore: registered new interface driver nfcmrvl
[    7.837538][    T1] Loading iSCSI transport class v2.0-870.
[    7.856507][    T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues
[    7.866977][    T1] ------------[ cut here ]------------
[    7.868232][    T1] refcount_t: decrement hit 0; leaking memory.
[    7.869519][    T1] WARNING: CPU: 0 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0
[    7.870990][    T1] Modules linked in:
[    7.871688][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-syzkaller-09791-ge5eb28f6d1af-dirty #0
[    7.876326][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
[    7.878700][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    7.879754][    T1] Code: b2 00 00 00 e8 27 5a f7 fc 5b 5d c3 cc cc cc cc e8 1b 5a f7 fc c6 05 f6 81 d3 0a 01 90 48 c7 c7 e0 a7 fd 8b e8 47 2e ba fc 90 <0f> 0b 90 90 eb d9 e8 fb 59 f7 fc c6 05 d3 81 d3 0a 01 90 48 c7 c7
[    7.882789][    T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[    7.884154][    T1] RAX: 427762defa97e000 RBX: ffff888020edeb2c RCX: ffff8880166c8000
[    7.885354][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    7.886832][    T1] RBP: 0000000000000004 R08: ffffffff8157cf32 R09: fffffbfff1bf9650
[    7.888655][    T1] R10: dffffc0000000000 R11: fffffbfff1bf9650 R12: ffffea0000843dc0
[    7.889916][    T1] R13: ffffea0000843dc8 R14: 1ffffd40001087b9 R15: 0000000000000000
[    7.893126][    T1] FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
[    7.895114][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    7.896277][    T1] CR2: ffff88823ffff000 CR3: 000000000df32000 CR4: 00000000003506f0
[    7.897638][    T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    7.900434][    T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    7.902939][    T1] Call Trace:
[    7.904000][    T1]  <TASK>
[    7.904699][    T1]  ? __warn+0x163/0x4b0
[    7.905611][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.906808][    T1]  ? report_bug+0x2b3/0x500
[    7.907725][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.908788][    T1]  ? handle_bug+0x3e/0x70
[    7.909996][    T1]  ? exc_invalid_op+0x1a/0x50
[    7.910753][    T1]  ? asm_exc_invalid_op+0x1a/0x20
[    7.911517][    T1]  ? __warn_printk+0x292/0x360
[    7.912828][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    7.914043][    T1]  ? refcount_warn_saturate+0xf9/0x1d0
[    7.914947][    T1]  __free_pages_ok+0xc36/0xd60
[    7.916124][    T1]  make_alloc_exact+0xa3/0xf0
[    7.917078][    T1]  vring_alloc_queue_split+0x20a/0x600
[    7.918018][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    7.919870][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    7.920839][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    7.921640][    T1]  ? virtio_dev_probe+0x991/0xaf0
[    7.922633][    T1]  ? really_probe+0x29e/0xc50
[    7.923595][    T1]  ? driver_probe_device+0x50/0x430
[    7.925027][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    7.926040][    T1]  ? ret_from_fork+0x4b/0x80
[    7.927657][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    7.929661][    T1]  vring_create_virtqueue+0xca/0x110
[    7.930785][    T1]  ? __pfx_vp_notify+0x10/0x10
[    7.931677][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.932523][    T1]  setup_vq+0xe9/0x2d0
[    7.933148][    T1]  ? __pfx_vp_notify+0x10/0x10
[    7.934298][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.936631][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.938514][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.939708][    T1]  vp_setup_vq+0xbf/0x330
[    7.940480][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    7.941952][    T1]  ? ioread16+0x2f/0x90
[    7.943383][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    7.945869][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    7.946930][    T1]  vp_find_vqs+0x4c/0x4e0
[    7.948366][    T1]  virtscsi_init+0x8db/0xd00
[    7.949444][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    7.950722][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    7.952485][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    7.954177][    T1]  ? vp_get+0xfd/0x140
[    7.955309][    T1]  virtscsi_probe+0x3ea/0xf60
[    7.956670][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    7.958350][    T1]  ? virtqueue_dma_mapping_error+0xd/0x80
[    7.960113][    T1]  ? __pfx_vp_set_status+0x10/0x10
[    7.961499][    T1]  ? vp_set_status+0x1a/0x40
[    7.962431][    T1]  ? virtio_no_restricted_mem_acc+0x9/0x10
[    7.964349][    T1]  ? virtio_features_ok+0x10c/0x270
[    7.965595][    T1]  virtio_dev_probe+0x991/0xaf0
[    7.966818][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    7.967921][    T1]  really_probe+0x29e/0xc50
[    7.968593][    T1]  __driver_probe_device+0x1a2/0x3e0
[    7.969535][    T1]  driver_probe_device+0x50/0x430
[    7.970634][    T1]  __driver_attach+0x45f/0x710
[    7.971732][    T1]  ? __pfx___driver_attach+0x10/0x10
[    7.973000][    T1]  bus_for_each_dev+0x239/0x2b0
[    7.974208][    T1]  ? __pfx___driver_attach+0x10/0x10
[    7.975425][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    7.976355][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    7.977543][    T1]  bus_add_driver+0x347/0x620
[    7.979682][    T1]  driver_register+0x23a/0x320
[    7.981056][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.982342][    T1]  virtio_scsi_init+0x65/0xe0
[    7.983870][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.985269][    T1]  do_one_initcall+0x238/0x830
[    7.986554][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    7.987867][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    7.989039][    T1]  ? lockdep_hardirqs_on_prepare+0x43d/0x780
[    7.990465][    T1]  ? __pfx_parse_args+0x10/0x10
[    7.991527][    T1]  ? do_initcalls+0x1c/0x80
[    7.992292][    T1]  ? rcu_is_watching+0x15/0xb0
[    7.993265][    T1]  do_initcall_level+0x157/0x210
[    7.994180][    T1]  do_initcalls+0x3f/0x80
[    7.994906][    T1]  kernel_init_freeable+0x435/0x5d0
[    7.995937][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    7.996856][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    7.997739][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.999001][    T1]  ? __pfx_kernel_init+0x10/0x10
[    7.999909][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.000823][    T1]  kernel_init+0x1d/0x2b0
[    8.001451][    T1]  ret_from_fork+0x4b/0x80
[    8.002268][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.003408][    T1]  ret_from_fork_asm+0x1a/0x30
[    8.004122][    T1]  </TASK>
[    8.005036][    T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[    8.006846][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-syzkaller-09791-ge5eb28f6d1af-dirty #0
[    8.009117][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
[    8.011687][    T1] Call Trace:
[    8.012892][    T1]  <TASK>
[    8.013386][    T1]  dump_stack_lvl+0x241/0x360
[    8.013386][    T1]  ? __pfx_dump_stack_lvl+0x10/0x10
[    8.013386][    T1]  ? __pfx__printk+0x10/0x10
[    8.013386][    T1]  ? _printk+0xd5/0x120
[    8.013386][    T1]  ? vscnprintf+0x5d/0x90
[    8.013386][    T1]  panic+0x349/0x860
[    8.013386][    T1]  ? __warn+0x172/0x4b0
[    8.013386][    T1]  ? __pfx_panic+0x10/0x10
[    8.013386][    T1]  ? show_trace_log_lvl+0x4e6/0x520
[    8.013386][    T1]  ? ret_from_fork_asm+0x1a/0x30
[    8.013386][    T1]  __warn+0x31e/0x4b0
[    8.013386][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.013386][    T1]  report_bug+0x2b3/0x500
[    8.013386][    T1]  ? refcount_warn_saturate+0xfa/0x1d0
[    8.013386][    T1]  handle_bug+0x3e/0x70
[    8.013386][    T1]  exc_invalid_op+0x1a/0x50
[    8.013386][    T1]  asm_exc_invalid_op+0x1a/0x20
[    8.013386][    T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[    8.013386][    T1] Code: b2 00 00 00 e8 27 5a f7 fc 5b 5d c3 cc cc cc cc e8 1b 5a f7 fc c6 05 f6 81 d3 0a 01 90 48 c7 c7 e0 a7 fd 8b e8 47 2e ba fc 90 <0f> 0b 90 90 eb d9 e8 fb 59 f7 fc c6 05 d3 81 d3 0a 01 90 48 c7 c7
[    8.013386][    T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[    8.013386][    T1] RAX: 427762defa97e000 RBX: ffff888020edeb2c RCX: ffff8880166c8000
[    8.013386][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    8.013386][    T1] RBP: 0000000000000004 R08: ffffffff8157cf32 R09: fffffbfff1bf9650
[    8.013386][    T1] R10: dffffc0000000000 R11: fffffbfff1bf9650 R12: ffffea0000843dc0
[    8.013386][    T1] R13: ffffea0000843dc8 R14: 1ffffd40001087b9 R15: 0000000000000000
[    8.013386][    T1]  ? __warn_printk+0x292/0x360
[    8.013386][    T1]  ? refcount_warn_saturate+0xf9/0x1d0
[    8.013386][    T1]  __free_pages_ok+0xc36/0xd60
[    8.013386][    T1]  make_alloc_exact+0xa3/0xf0
[    8.013386][    T1]  vring_alloc_queue_split+0x20a/0x600
[    8.013386][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[    8.013386][    T1]  ? vp_find_vqs+0x4c/0x4e0
[    8.013386][    T1]  ? virtscsi_probe+0x3ea/0xf60
[    8.013386][    T1]  ? virtio_dev_probe+0x991/0xaf0
[    8.013386][    T1]  ? really_probe+0x29e/0xc50
[    8.013386][    T1]  ? driver_probe_device+0x50/0x430
[    8.013386][    T1]  vring_create_virtqueue_split+0xc6/0x310
[    8.013386][    T1]  ? ret_from_fork+0x4b/0x80
[    8.063354][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[    8.063354][    T1]  vring_create_virtqueue+0xca/0x110
[    8.063354][    T1]  ? __pfx_vp_notify+0x10/0x10
[    8.063354][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.063354][    T1]  setup_vq+0xe9/0x2d0
[    8.063354][    T1]  ? __pfx_vp_notify+0x10/0x10
[    8.063354][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.063354][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.063354][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.063354][    T1]  vp_setup_vq+0xbf/0x330
[    8.063354][    T1]  ? __pfx_vp_config_changed+0x10/0x10
[    8.063354][    T1]  ? ioread16+0x2f/0x90
[    8.063354][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[    8.063354][    T1]  vp_find_vqs_msix+0x8b2/0xc80
[    8.063354][    T1]  vp_find_vqs+0x4c/0x4e0
[    8.063354][    T1]  virtscsi_init+0x8db/0xd00
[    8.063354][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[    8.063354][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[    8.063354][    T1]  ? scsi_host_alloc+0xa57/0xea0
[    8.063354][    T1]  ? vp_get+0xfd/0x140
[    8.063354][    T1]  virtscsi_probe+0x3ea/0xf60
[    8.063354][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[    8.063354][    T1]  ? virtqueue_dma_mapping_error+0xd/0x80
[    8.063354][    T1]  ? __pfx_vp_set_status+0x10/0x10
[    8.063354][    T1]  ? vp_set_status+0x1a/0x40
[    8.063354][    T1]  ? virtio_no_restricted_mem_acc+0x9/0x10
[    8.063354][    T1]  ? virtio_features_ok+0x10c/0x270
[    8.063354][    T1]  virtio_dev_probe+0x991/0xaf0
[    8.063354][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    8.063354][    T1]  really_probe+0x29e/0xc50
[    8.063354][    T1]  __driver_probe_device+0x1a2/0x3e0
[    8.063354][    T1]  driver_probe_device+0x50/0x430
[    8.063354][    T1]  __driver_attach+0x45f/0x710
[    8.063354][    T1]  ? __pfx___driver_attach+0x10/0x10
[    8.063354][    T1]  bus_for_each_dev+0x239/0x2b0
[    8.063354][    T1]  ? __pfx___driver_attach+0x10/0x10
[    8.063354][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    8.063354][    T1]  ? do_raw_spin_unlock+0x13c/0x8b0
[    8.063354][    T1]  bus_add_driver+0x347/0x620
[    8.063354][    T1]  driver_register+0x23a/0x320
[    8.063354][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.063354][    T1]  virtio_scsi_init+0x65/0xe0
[    8.063354][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.063354][    T1]  do_one_initcall+0x238/0x830
[    8.063354][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[    8.063354][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    8.063354][    T1]  ? lockdep_hardirqs_on_prepare+0x43d/0x780
[    8.063354][    T1]  ? __pfx_parse_args+0x10/0x10
[    8.113373][    T1]  ? do_initcalls+0x1c/0x80
[    8.113373][    T1]  ? rcu_is_watching+0x15/0xb0
[    8.113373][    T1]  do_initcall_level+0x157/0x210
[    8.113373][    T1]  do_initcalls+0x3f/0x80
[    8.113373][    T1]  kernel_init_freeable+0x435/0x5d0
[    8.113373][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[    8.113373][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[    8.113373][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.113373][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.113373][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.113373][    T1]  kernel_init+0x1d/0x2b0
[    8.113373][    T1]  ret_from_fork+0x4b/0x80
[    8.113373][    T1]  ? __pfx_kernel_init+0x10/0x10
[    8.113373][    T1]  ret_from_fork_asm+0x1a/0x30
[    8.113373][    T1]  </TASK>
[    8.113373][    T1] Kernel Offset: disabled
[    8.113373][    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-build2569298022=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at d615901c7
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=d615901c739a765329b688494cee2f8e1b5037cb -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240314-145638'" "-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=d615901c739a765329b688494cee2f8e1b5037cb -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240314-145638'" "-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=d615901c739a765329b688494cee2f8e1b5037cb -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240314-145638'" "-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=\"d615901c739a765329b688494cee2f8e1b5037cb\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=161a7959180000


Tested on:

commit:         e5eb28f6 Merge tag 'mm-nonmm-stable-2024-03-14-09-36' ..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
kernel config:  https://syzkaller.appspot.com/x/.config?x=839e3be5d86ffd1d
dashboard link: https://syzkaller.appspot.com/bug?extid=f3bc6f8108108010a03d
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13298231180000


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