Re: [syzbot] [nilfs?] UBSAN: array-index-out-of-bounds in nilfs_add_link

From: syzbot
Date: Mon Apr 15 2024 - 11:00:22 EST

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In reply to: Ryusuke Konishi: "Re: [syzbot] [nilfs?] UBSAN: array-index-out-of-bounds in nilfs_add_link"
Next in thread: Ryusuke Konishi: "[PATCH] nilfs2: Fix OOB in nilfs_set_de_type"
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Hello,

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

[ 8.046646][ T1] usbcore: registered new interface driver pn533_usb
[ 8.053398][ T1] nfcsim 0.2 initialized
[ 8.054384][ T1] usbcore: registered new interface driver port100
[ 8.056070][ T1] usbcore: registered new interface driver nfcmrvl
[ 8.063127][ T1] Loading iSCSI transport class v2.0-870.
[ 8.083033][ T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues
[ 8.093514][ T1] ------------[ cut here ]------------
[ 8.097392][ T1] refcount_t: decrement hit 0; leaking memory.
[ 8.098749][ T1] WARNING: CPU: 1 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0
[ 8.100089][ T1] Modules linked in:
[ 8.100981][ T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc4-syzkaller-dirty #0
[ 8.102964][ T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
[ 8.104809][ T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[ 8.105854][ T1] Code: b2 00 00 00 e8 87 70 f0 fc 5b 5d c3 cc cc cc cc e8 7b 70 f0 fc c6 05 ac bf ed 0a 01 90 48 c7 c7 80 66 1e 8c e8 e7 0a b3 fc 90 <0f> 0b 90 90 eb d9 e8 5b 70 f0 fc c6 05 89 bf ed 0a 01 90 48 c7 c7
[ 8.109304][ T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[ 8.110372][ T1] RAX: a5557a779647f700 RBX: ffff8881432f33fc RCX: ffff888016ac0000
[ 8.111482][ T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 8.112881][ T1] RBP: 0000000000000004 R08: ffffffff81587fc2 R09: fffffbfff1c39b48
[ 8.114169][ T1] R10: dffffc0000000000 R11: fffffbfff1c39b48 R12: ffffea000503cdc0
[ 8.115576][ T1] R13: ffffea000503cdc8 R14: 1ffffd4000a079b9 R15: 0000000000000000
[ 8.116934][ T1] FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
[ 8.118632][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 8.120448][ T1] CR2: 0000000000000000 CR3: 000000000e134000 CR4: 00000000003506f0
[ 8.121952][ T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 8.125239][ T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 8.128444][ T1] Call Trace:
[ 8.128999][ T1] <TASK>
[ 8.129476][ T1] ? __warn+0x163/0x4e0
[ 8.130277][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 8.131293][ T1] ? report_bug+0x2b3/0x500
[ 8.132024][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 8.133864][ T1] ? handle_bug+0x3e/0x70
[ 8.134800][ T1] ? exc_invalid_op+0x1a/0x50
[ 8.135746][ T1] ? asm_exc_invalid_op+0x1a/0x20
[ 8.136660][ T1] ? __warn_printk+0x292/0x360
[ 8.138782][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 8.139747][ T1] ? refcount_warn_saturate+0xf9/0x1d0
[ 8.141576][ T1] __free_pages_ok+0xc54/0xd80
[ 8.142662][ T1] make_alloc_exact+0xa3/0xf0
[ 8.143619][ T1] vring_alloc_queue_split+0x20a/0x600
[ 8.144668][ T1] ? __pfx_vring_alloc_queue_split+0x10/0x10
[ 8.145585][ T1] ? vp_find_vqs+0x4c/0x4e0
[ 8.146361][ T1] ? virtscsi_probe+0x3ea/0xf60
[ 8.147253][ T1] ? virtio_dev_probe+0x991/0xaf0
[ 8.148035][ T1] ? really_probe+0x2b8/0xad0
[ 8.148878][ T1] ? driver_probe_device+0x50/0x430
[ 8.149903][ T1] vring_create_virtqueue_split+0xc6/0x310
[ 8.150905][ T1] ? ret_from_fork+0x4b/0x80
[ 8.152921][ T1] ? __pfx_vring_create_virtqueue_split+0x10/0x10
[ 8.154006][ T1] vring_create_virtqueue+0xca/0x110
[ 8.155477][ T1] ? __pfx_vp_notify+0x10/0x10
[ 8.156849][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 8.158255][ T1] setup_vq+0xe9/0x2d0
[ 8.158966][ T1] ? __pfx_vp_notify+0x10/0x10
[ 8.160058][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 8.161161][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 8.162896][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 8.163930][ T1] vp_setup_vq+0xbf/0x330
[ 8.164941][ T1] ? __pfx_vp_config_changed+0x10/0x10
[ 8.166253][ T1] ? ioread16+0x2f/0x90
[ 8.167168][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 8.168459][ T1] vp_find_vqs_msix+0x8b2/0xc80
[ 8.169516][ T1] vp_find_vqs+0x4c/0x4e0
[ 8.170429][ T1] virtscsi_init+0x8db/0xd00
[ 8.171852][ T1] ? __pfx_virtscsi_init+0x10/0x10
[ 8.172801][ T1] ? __pfx_default_calc_sets+0x10/0x10
[ 8.176106][ T1] ? scsi_host_alloc+0xa57/0xea0
[ 8.177026][ T1] ? vp_get+0xfd/0x140
[ 8.177595][ T1] virtscsi_probe+0x3ea/0xf60
[ 8.178351][ T1] ? __pfx_virtscsi_probe+0x10/0x10
[ 8.179274][ T1] ? vp_get_shm_region+0x51d/0x8b0
[ 8.180369][ T1] ? __pfx_vp_set_status+0x10/0x10
[ 8.181850][ T1] ? vp_set_status+0x1a/0x40
[ 8.182628][ T1] ? virtio_no_restricted_mem_acc+0x9/0x10
[ 8.183880][ T1] ? virtio_features_ok+0x10c/0x270
[ 8.184839][ T1] virtio_dev_probe+0x991/0xaf0
[ 8.185666][ T1] ? __pfx_virtio_dev_probe+0x10/0x10
[ 8.186643][ T1] really_probe+0x2b8/0xad0
[ 8.187658][ T1] __driver_probe_device+0x1a2/0x390
[ 8.188847][ T1] driver_probe_device+0x50/0x430
[ 8.189648][ T1] __driver_attach+0x45f/0x710
[ 8.190566][ T1] ? __pfx___driver_attach+0x10/0x10
[ 8.191463][ T1] bus_for_each_dev+0x239/0x2b0
[ 8.192162][ T1] ? __pfx___driver_attach+0x10/0x10
[ 8.193282][ T1] ? __pfx_bus_for_each_dev+0x10/0x10
[ 8.194135][ T1] ? do_raw_spin_unlock+0x13c/0x8b0
[ 8.195052][ T1] bus_add_driver+0x347/0x620
[ 8.195904][ T1] driver_register+0x23a/0x320
[ 8.196676][ T1] virtio_scsi_init+0x69/0xe0
[ 8.197688][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 8.198566][ T1] do_one_initcall+0x248/0x880
[ 8.199453][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 8.200558][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[ 8.201915][ T1] ? __pfx_do_one_initcall+0x10/0x10
[ 8.202821][ T1] ? __pfx_parse_args+0x10/0x10
[ 8.203915][ T1] ? do_initcalls+0x1c/0x80
[ 8.204956][ T1] ? rcu_is_watching+0x15/0xb0
[ 8.205785][ T1] do_initcall_level+0x157/0x210
[ 8.206580][ T1] do_initcalls+0x3f/0x80
[ 8.207402][ T1] kernel_init_freeable+0x435/0x5d0
[ 8.208171][ T1] ? __pfx_kernel_init_freeable+0x10/0x10
[ 8.209120][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[ 8.210016][ T1] ? __pfx_kernel_init+0x10/0x10
[ 8.211607][ T1] ? __pfx_kernel_init+0x10/0x10
[ 8.212570][ T1] ? __pfx_kernel_init+0x10/0x10
[ 8.213608][ T1] kernel_init+0x1d/0x2b0
[ 8.214363][ T1] ret_from_fork+0x4b/0x80
[ 8.215262][ T1] ? __pfx_kernel_init+0x10/0x10
[ 8.216195][ T1] ret_from_fork_asm+0x1a/0x30
[ 8.216904][ T1] </TASK>
[ 8.217906][ T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 8.219113][ T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc4-syzkaller-dirty #0
[ 8.220551][ T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
[ 8.222223][ T1] Call Trace:
[ 8.222793][ T1] <TASK>
[ 8.223243][ T1] dump_stack_lvl+0x241/0x360
[ 8.224079][ T1] ? __pfx_dump_stack_lvl+0x10/0x10
[ 8.224927][ T1] ? __pfx__printk+0x10/0x10
[ 8.225243][ T1] ? _printk+0xd5/0x120
[ 8.225243][ T1] ? vscnprintf+0x5d/0x90
[ 8.225243][ T1] panic+0x349/0x860
[ 8.225243][ T1] ? __warn+0x172/0x4e0
[ 8.225243][ T1] ? __pfx_panic+0x10/0x10
[ 8.225243][ T1] ? show_trace_log_lvl+0x4e6/0x520
[ 8.225243][ T1] ? ret_from_fork_asm+0x1a/0x30
[ 8.225243][ T1] __warn+0x346/0x4e0
[ 8.225243][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 8.225243][ T1] report_bug+0x2b3/0x500
[ 8.225243][ T1] ? refcount_warn_saturate+0xfa/0x1d0
[ 8.225243][ T1] handle_bug+0x3e/0x70
[ 8.225243][ T1] exc_invalid_op+0x1a/0x50
[ 8.225243][ T1] asm_exc_invalid_op+0x1a/0x20
[ 8.225243][ T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0
[ 8.225243][ T1] Code: b2 00 00 00 e8 87 70 f0 fc 5b 5d c3 cc cc cc cc e8 7b 70 f0 fc c6 05 ac bf ed 0a 01 90 48 c7 c7 80 66 1e 8c e8 e7 0a b3 fc 90 <0f> 0b 90 90 eb d9 e8 5b 70 f0 fc c6 05 89 bf ed 0a 01 90 48 c7 c7
[ 8.225243][ T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246
[ 8.225243][ T1] RAX: a5557a779647f700 RBX: ffff8881432f33fc RCX: ffff888016ac0000
[ 8.225243][ T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 8.225243][ T1] RBP: 0000000000000004 R08: ffffffff81587fc2 R09: fffffbfff1c39b48
[ 8.225243][ T1] R10: dffffc0000000000 R11: fffffbfff1c39b48 R12: ffffea000503cdc0
[ 8.225243][ T1] R13: ffffea000503cdc8 R14: 1ffffd4000a079b9 R15: 0000000000000000
[ 8.225243][ T1] ? __warn_printk+0x292/0x360
[ 8.225243][ T1] ? refcount_warn_saturate+0xf9/0x1d0
[ 8.225243][ T1] __free_pages_ok+0xc54/0xd80
[ 8.225243][ T1] make_alloc_exact+0xa3/0xf0
[ 8.225243][ T1] vring_alloc_queue_split+0x20a/0x600
[ 8.225243][ T1] ? __pfx_vring_alloc_queue_split+0x10/0x10
[ 8.225243][ T1] ? vp_find_vqs+0x4c/0x4e0
[ 8.225243][ T1] ? virtscsi_probe+0x3ea/0xf60
[ 8.225243][ T1] ? virtio_dev_probe+0x991/0xaf0
[ 8.225243][ T1] ? really_probe+0x2b8/0xad0
[ 8.225243][ T1] ? driver_probe_device+0x50/0x430
[ 8.225243][ T1] vring_create_virtqueue_split+0xc6/0x310
[ 8.225243][ T1] ? ret_from_fork+0x4b/0x80
[ 8.225243][ T1] ? __pfx_vring_create_virtqueue_split+0x10/0x10
[ 8.225243][ T1] vring_create_virtqueue+0xca/0x110
[ 8.225243][ T1] ? __pfx_vp_notify+0x10/0x10
[ 8.225243][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 8.225243][ T1] setup_vq+0xe9/0x2d0
[ 8.225243][ T1] ? __pfx_vp_notify+0x10/0x10
[ 8.225243][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 8.225243][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 8.225243][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 8.225243][ T1] vp_setup_vq+0xbf/0x330
[ 8.225243][ T1] ? __pfx_vp_config_changed+0x10/0x10
[ 8.225243][ T1] ? ioread16+0x2f/0x90
[ 8.225243][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10
[ 8.274896][ T1] vp_find_vqs_msix+0x8b2/0xc80
[ 8.274896][ T1] vp_find_vqs+0x4c/0x4e0
[ 8.274896][ T1] virtscsi_init+0x8db/0xd00
[ 8.274896][ T1] ? __pfx_virtscsi_init+0x10/0x10
[ 8.274896][ T1] ? __pfx_default_calc_sets+0x10/0x10
[ 8.274896][ T1] ? scsi_host_alloc+0xa57/0xea0
[ 8.274896][ T1] ? vp_get+0xfd/0x140
[ 8.274896][ T1] virtscsi_probe+0x3ea/0xf60
[ 8.274896][ T1] ? __pfx_virtscsi_probe+0x10/0x10
[ 8.274896][ T1] ? vp_get_shm_region+0x51d/0x8b0
[ 8.274896][ T1] ? __pfx_vp_set_status+0x10/0x10
[ 8.274896][ T1] ? vp_set_status+0x1a/0x40
[ 8.274896][ T1] ? virtio_no_restricted_mem_acc+0x9/0x10
[ 8.274896][ T1] ? virtio_features_ok+0x10c/0x270
[ 8.274896][ T1] virtio_dev_probe+0x991/0xaf0
[ 8.274896][ T1] ? __pfx_virtio_dev_probe+0x10/0x10
[ 8.274896][ T1] really_probe+0x2b8/0xad0
[ 8.274896][ T1] __driver_probe_device+0x1a2/0x390
[ 8.274896][ T1] driver_probe_device+0x50/0x430
[ 8.274896][ T1] __driver_attach+0x45f/0x710
[ 8.274896][ T1] ? __pfx___driver_attach+0x10/0x10
[ 8.274896][ T1] bus_for_each_dev+0x239/0x2b0
[ 8.274896][ T1] ? __pfx___driver_attach+0x10/0x10
[ 8.274896][ T1] ? __pfx_bus_for_each_dev+0x10/0x10
[ 8.274896][ T1] ? do_raw_spin_unlock+0x13c/0x8b0
[ 8.274896][ T1] bus_add_driver+0x347/0x620
[ 8.274896][ T1] driver_register+0x23a/0x320
[ 8.274896][ T1] virtio_scsi_init+0x69/0xe0
[ 8.274896][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 8.274896][ T1] do_one_initcall+0x248/0x880
[ 8.274896][ T1] ? __pfx_virtio_scsi_init+0x10/0x10
[ 8.274896][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[ 8.274896][ T1] ? __pfx_do_one_initcall+0x10/0x10
[ 8.274896][ T1] ? __pfx_parse_args+0x10/0x10
[ 8.274896][ T1] ? do_initcalls+0x1c/0x80
[ 8.274896][ T1] ? rcu_is_watching+0x15/0xb0
[ 8.274896][ T1] do_initcall_level+0x157/0x210
[ 8.274896][ T1] do_initcalls+0x3f/0x80
[ 8.274896][ T1] kernel_init_freeable+0x435/0x5d0
[ 8.274896][ T1] ? __pfx_kernel_init_freeable+0x10/0x10
[ 8.274896][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[ 8.274896][ T1] ? __pfx_kernel_init+0x10/0x10
[ 8.274896][ T1] ? __pfx_kernel_init+0x10/0x10
[ 8.274896][ T1] ? __pfx_kernel_init+0x10/0x10
[ 8.274896][ T1] kernel_init+0x1d/0x2b0
[ 8.274896][ T1] ret_from_fork+0x4b/0x80
[ 8.274896][ T1] ? __pfx_kernel_init+0x10/0x10
[ 8.274896][ T1] ret_from_fork_asm+0x1a/0x30
[ 8.274896][ T1] </TASK>
[ 8.274896][ T1] Kernel Offset: disabled
[ 8.274896][ 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-build2608577974=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at c8349e485
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=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-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=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-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=c8349e48534ea6d8f01515335d95de8ebf5da8df -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240412-102842'" "-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=\"c8349e48534ea6d8f01515335d95de8ebf5da8df\"

Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=16ca23d5180000

Tested on:

commit: 0bbac3fa Linux 6.9-rc4
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel config: https://syzkaller.appspot.com/x/.config?x=b6bcb7598d5494cd
dashboard link: https://syzkaller.appspot.com/bug?extid=2e22057de05b9f3b30d8
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=13fe882b180000

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