Message-ID: <6882ce2a.a00a0220.2f88df.0038.GAE@google.com>
Date: Thu, 24 Jul 2025 17:22:02 -0700
From: syzbot <syzbot+0fc08dad8f34563208d5@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [hams?] KASAN: slab-use-after-free Read in rose_new_lci

Hello,

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

ed kernel key: 9ece6e4dbdc04b5c1cbbfaba00b7dca934806a52'
[   32.312810][    T1] zswap: loaded using pool 842/zsmalloc
[   32.324717][    T1] Demotion targets for Node 0: null
[   32.330575][    T1] Demotion targets for Node 1: null
[   32.335881][    T1] debug_vm_pgtable: [debug_vm_pgtable         ]: Validating architecture page table helpers
[   35.693466][    T1] Key type .fscrypt registered
[   35.699267][    T1] Key type fscrypt-provisioning registered
[   35.711339][    T1] kAFS: Red Hat AFS client v0.1 registering.
[   35.748666][    T1] Btrfs loaded, assert=on, ref-verify=on, zoned=yes, fsverity=yes
[   35.758902][    T1] Key type big_key registered
[   35.764107][    T1] Key type encrypted registered
[   35.769924][    T1] AppArmor: AppArmor sha256 policy hashing enabled
[   35.777609][    T1] ima: No TPM chip found, activating TPM-bypass!
[   35.784293][    T1] Loading compiled-in module X.509 certificates
[   35.824583][    T1] Loaded X.509 cert 'Build time autogenerated kernel key: 9ece6e4dbdc04b5c1cbbfaba00b7dca934806a52'
[   35.836683][    T1] ima: Allocated hash algorithm: sha256
[   35.843653][    T1] ima: No architecture policies found
[   35.850844][    T1] evm: Initialising EVM extended attributes:
[   35.857287][    T1] evm: security.selinux (disabled)
[   35.862772][    T1] evm: security.SMACK64 (disabled)
[   35.868535][    T1] evm: security.SMACK64EXEC (disabled)
[   35.874405][    T1] evm: security.SMACK64TRANSMUTE (disabled)
[   35.880994][    T1] evm: security.SMACK64MMAP (disabled)
[   35.887534][    T1] evm: security.apparmor
[   35.892048][    T1] evm: security.ima
[   35.896126][    T1] evm: security.capability
[   35.901126][    T1] evm: HMAC attrs: 0x1
[   35.908402][    T1] PM:   Magic number: 1:51:204
[   35.914541][    T1] video4linux video84: hash matches
[   35.920228][    T1] usb usb53-port3: hash matches
[   35.925732][    T1] tty ttyt2: hash matches
[   35.931143][    T1] netconsole: network logging started
[   35.940096][    T1] gtp: GTP module loaded (pdp ctx size 128 bytes)
[   35.955263][    T1] rdma_rxe: loaded
[   35.961839][    T1] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[   35.976051][    T1] Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[   35.985947][    T1] Loaded X.509 cert 'wens: 61c038651aabdcf94bd0ac7ff06c7248db18c600'
[   35.996554][    T1] clk: Disabling unused clocks
[   35.998201][   T43] faux_driver regulatory: Direct firmware load for regulatory.db failed with error -2
[   36.002101][    T1] ALSA device list:
[   36.016187][   T43] faux_driver regulatory: Falling back to sysfs fallback for: regulatory.db
[   36.016507][    T1]   #0: Dummy 1
[   36.029888][    T1]   #1: Loopback 1
[   36.033903][    T1]   #2: Virtual MIDI Card 1
[   36.043176][    T1] check access for rdinit=/init failed: -2, ignoring
[   36.050421][    T1] md: Waiting for all devices to be available before autodetect
[   36.059471][    T1] md: If you don't use raid, use raid=noautodetect
[   36.066354][    T1] md: Autodetecting RAID arrays.
[   36.071715][    T1] md: autorun ...
[   36.075839][    T1] md: ... autorun DONE.
[   36.248389][    T1] EXT4-fs (sda1): orphan cleanup on readonly fs
[   36.258318][    T1] EXT4-fs (sda1): mounted filesystem 4f91c6db-4997-4bb4-91b8-7e83a20c1bf1 ro with ordered data mode. Quota mode: none.
[   36.271871][    T1] VFS: Mounted root (ext4 filesystem) readonly on device 8:1.
[   36.301101][    T1] devtmpfs: mounted
[   36.394643][    T1] Freeing unused kernel image (initmem) memory: 26452K
[   36.408071][    T1] Write protecting the kernel read-only data: 215040k
[   36.433709][    T1] Freeing unused kernel image (text/rodata gap) memory: 1720K
[   36.448517][    T1] Freeing unused kernel image (rodata/data gap) memory: 1368K
[   36.661640][    T1] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[   36.670344][    T1] x86/mm: Checking user space page tables
[   36.853655][    T1] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[   36.868256][    T1] Failed to set sysctl parameter 'max_rcu_stall_to_panic=1': parameter not found
[   36.879031][    T1] Run /sbin/init as init process
[   37.400517][ T5182] mount (5182) used greatest stack depth: 24104 bytes left
[   37.482883][ T5183] EXT4-fs (sda1): re-mounted 4f91c6db-4997-4bb4-91b8-7e83a20c1bf1 r/w.
mount: mounting devtmpfs on /dev failed: Device or resource busy
mount: mounting smackfs on /sys/fs/smackfs failed: No such file or directory
mount: mounting selinuxfs on /sys/fs/selinux failed: No such file or directory
[   37.672016][ T5188] modprobe (5188) used greatest stack depth: 22264 bytes left
[   37.685646][ T5187] mount (5187) used greatest stack depth: 21768 bytes left
Starting syslogd: OK
Starting acpid: OK
Starting klogd: OK
Running sysctl: [   38.681051][ T5213] logger (5213) used greatest stack depth: 21704 bytes left
OK
Populating /dev using udev: [   39.012692][ T5217] udevd[5217]: starting version 3.2.14
[   39.312287][ T5218] udevd[5218]: starting eudev-3.2.14
[   39.322002][ T5217] udevd (5217) used greatest stack depth: 18824 bytes left
[   49.239305][ T5307] ------------[ cut here ]------------
[   49.246128][ T5307] AppArmor WARN apparmor_unix_stream_connect: ((({ typeof(*(new_ctx->label)) *__UNIQUE_ID_rcu2213 = (typeof(*(new_ctx->label)) *)({ do { __attribute__((__noreturn__)) extern void __compiletime_assert_2214(void) __attribute__((__error__("Unsupported access size for {READ,WRITE}_ONCE()."))); if (!((sizeof((new_ctx->label)) == sizeof(char) || sizeof((new_ctx->label)) == sizeof(short) || sizeof((new_ctx->label)) == sizeof(int) || sizeof((new_ctx->label)) == sizeof(long)) || sizeof((new_ctx->label)) == sizeof(long long))) __compiletime_assert_2214(); } while (0); (*(const volatile typeof( _Generic(((new_ctx->label)), char: (char)0, unsigned char: (unsigned char)0, signed char: (signed char)0, unsigned short: (unsigned short)0, signed short: (signed short)0, unsigned int: (unsigned int)0, signed int: (signed int)0, unsigned long: (unsigned long)0, signed long: (signed long)0, unsigned long long: (unsigned long long)0, signed long long: (signed long long)0, default: ((new_ctx->label)))) *)&((new_ctx->label))); }); ; 
[   49.247187][ T5307] WARNING: security/apparmor/lsm.c:1211 at apparmor_unix_stream_connect+0x5fa/0x650, CPU#1: udevadm/5307
[   49.364397][ T5307] Modules linked in:
[   49.369110][ T5307] CPU: 1 UID: 0 PID: 5307 Comm: udevadm Not tainted 6.16.0-rc7-next-20250724-syzkaller-g9ee814bd78e3-dirty #0 PREEMPT(full) 
[   49.383192][ T5307] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
[   49.393762][ T5307] RIP: 0010:apparmor_unix_stream_connect+0x5fa/0x650
[   49.400918][ T5307] Code: 00 3b fd 48 89 ef e8 35 4d 00 00 e9 09 fe ff ff e8 bb 00 3b fd 90 48 c7 c7 80 33 fd 8b 48 c7 c6 31 52 c7 8d e8 f7 7f fe fc 90 <0f> 0b 90 90 e9 27 fe ff ff e8 98 00 3b fd be 02 00 00 00 eb 0a e8
[   49.421322][ T5307] RSP: 0018:ffffc90002ea7c38 EFLAGS: 00010246
[   49.428021][ T5307] RAX: e44b99ab8cef2000 RBX: 1ffff11006365f58 RCX: ffff888025c38000
[   49.436750][ T5307] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
[   49.445413][ T5307] RBP: ffff88801ba8f8f8 R08: ffff8880b8724253 R09: 1ffff110170e484a
[   49.453784][ T5307] R10: dffffc0000000000 R11: ffffed10170e484b R12: ffff888031b2fac0
[   49.462663][ T5307] R13: 1ffff1100bcfff70 R14: 0000000000000000 R15: 000000000000002f
[   49.471487][ T5307] FS:  00007f12d413d880(0000) GS:ffff8881258a2000(0000) knlGS:0000000000000000
[   49.480684][ T5307] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   49.487634][ T5307] CR2: 00007f12d3a7ae00 CR3: 000000005dcd8000 CR4: 00000000003526f0
[   49.496204][ T5307] Call Trace:
[   49.499687][ T5307]  <TASK>
[   49.502867][ T5307]  security_unix_stream_connect+0xcb/0x2c0
[   49.509574][ T5307]  unix_stream_connect+0xc57/0x1030
[   49.515768][ T5307]  __sys_connect+0x316/0x440
[   49.521045][ T5307]  ? count_memcg_event_mm+0x21/0x260
[   49.527164][ T5307]  ? __pfx___sys_connect+0x10/0x10
[   49.534369][ T5307]  __x64_sys_connect+0x7a/0x90
[   49.539881][ T5307]  do_syscall_64+0xfa/0x3b0
[   49.544628][ T5307]  ? lockdep_hardirqs_on+0x9c/0x150
[   49.550014][ T5307]  ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   49.556349][ T5307]  ? clear_bhb_loop+0x60/0xb0
[   49.561387][ T5307]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   49.568532][ T5307] RIP: 0033:0x7f12d3aa7407
[   49.573201][ T5307] Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[   49.594955][ T5307] RSP: 002b:00007ffe1593fa80 EFLAGS: 00000202 ORIG_RAX: 000000000000002a
[   49.603833][ T5307] RAX: ffffffffffffffda RBX: 00007f12d413d880 RCX: 00007f12d3aa7407
[   49.612506][ T5307] RDX: 0000000000000013 RSI: 000055ce2bac2948 RDI: 0000000000000003
[   49.621046][ T5307] RBP: 000000000000001e R08: 0000000000000000 R09: 0000000000000000
[   49.629405][ T5307] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe1593fae0
[   49.638437][ T5307] R13: 0000000000000000 R14: 0000000000000007 R15: 0000000000000000
[   49.647498][ T5307]  </TASK>
[   49.650564][ T5307] Kernel panic - not syncing: kernel: panic_on_warn set ...
[   49.657982][ T5307] CPU: 1 UID: 0 PID: 5307 Comm: udevadm Not tainted 6.16.0-rc7-next-20250724-syzkaller-g9ee814bd78e3-dirty #0 PREEMPT(full) 
[   49.670964][ T5307] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
[   49.681493][ T5307] Call Trace:
[   49.685026][ T5307]  <TASK>
[   49.688100][ T5307]  dump_stack_lvl+0x99/0x250
[   49.692927][ T5307]  ? __asan_memcpy+0x40/0x70
[   49.697931][ T5307]  ? __pfx_dump_stack_lvl+0x10/0x10
[   49.703453][ T5307]  ? __pfx__printk+0x10/0x10
[   49.708160][ T5307]  vpanic+0x281/0x750
[   49.712205][ T5307]  ? __pfx__printk+0x10/0x10
[   49.717124][ T5307]  ? __pfx_vpanic+0x10/0x10
[   49.721690][ T5307]  ? is_bpf_text_address+0x292/0x2b0
[   49.727130][ T5307]  ? is_bpf_text_address+0x26/0x2b0
[   49.732566][ T5307]  panic+0xb9/0xc0
[   49.736352][ T5307]  ? __pfx_panic+0x10/0x10
[   49.740901][ T5307]  __warn+0x334/0x4c0
[   49.745033][ T5307]  ? apparmor_unix_stream_connect+0x5fa/0x650
[   49.751314][ T5307]  ? apparmor_unix_stream_connect+0x5fa/0x650
[   49.757676][ T5307]  report_bug+0x2be/0x4f0
[   49.762126][ T5307]  ? apparmor_unix_stream_connect+0x5fa/0x650
[   49.768310][ T5307]  ? apparmor_unix_stream_connect+0x5fa/0x650
[   49.774745][ T5307]  ? apparmor_unix_stream_connect+0x5fc/0x650
[   49.781261][ T5307]  handle_bug+0x84/0x160
[   49.785905][ T5307]  exc_invalid_op+0x1a/0x50
[   49.790709][ T5307]  asm_exc_invalid_op+0x1a/0x20
[   49.796020][ T5307] RIP: 0010:apparmor_unix_stream_connect+0x5fa/0x650
[   49.803687][ T5307] Code: 00 3b fd 48 89 ef e8 35 4d 00 00 e9 09 fe ff ff e8 bb 00 3b fd 90 48 c7 c7 80 33 fd 8b 48 c7 c6 31 52 c7 8d e8 f7 7f fe fc 90 <0f> 0b 90 90 e9 27 fe ff ff e8 98 00 3b fd be 02 00 00 00 eb 0a e8
[   49.824919][ T5307] RSP: 0018:ffffc90002ea7c38 EFLAGS: 00010246
[   49.831283][ T5307] RAX: e44b99ab8cef2000 RBX: 1ffff11006365f58 RCX: ffff888025c38000
[   49.839564][ T5307] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
[   49.848147][ T5307] RBP: ffff88801ba8f8f8 R08: ffff8880b8724253 R09: 1ffff110170e484a
[   49.856684][ T5307] R10: dffffc0000000000 R11: ffffed10170e484b R12: ffff888031b2fac0
[   49.865820][ T5307] R13: 1ffff1100bcfff70 R14: 0000000000000000 R15: 000000000000002f
[   49.875259][ T5307]  ? apparmor_unix_stream_connect+0x5f9/0x650
[   49.881502][ T5307]  security_unix_stream_connect+0xcb/0x2c0
[   49.887795][ T5307]  unix_stream_connect+0xc57/0x1030
[   49.893751][ T5307]  __sys_connect+0x316/0x440
[   49.898486][ T5307]  ? count_memcg_event_mm+0x21/0x260
[   49.904618][ T5307]  ? __pfx___sys_connect+0x10/0x10
[   49.909963][ T5307]  __x64_sys_connect+0x7a/0x90
[   49.915011][ T5307]  do_syscall_64+0xfa/0x3b0
[   49.919636][ T5307]  ? lockdep_hardirqs_on+0x9c/0x150
[   49.924973][ T5307]  ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   49.931380][ T5307]  ? clear_bhb_loop+0x60/0xb0
[   49.936332][ T5307]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   49.942236][ T5307] RIP: 0033:0x7f12d3aa7407
[   49.946844][ T5307] Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[   49.967773][ T5307] RSP: 002b:00007ffe1593fa80 EFLAGS: 00000202 ORIG_RAX: 000000000000002a
[   49.976926][ T5307] RAX: ffffffffffffffda RBX: 00007f12d413d880 RCX: 00007f12d3aa7407
[   49.985528][ T5307] RDX: 0000000000000013 RSI: 000055ce2bac2948 RDI: 0000000000000003
[   49.993550][ T5307] RBP: 000000000000001e R08: 0000000000000000 R09: 0000000000000000
[   50.001699][ T5307] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe1593fae0
[   50.011078][ T5307] R13: 0000000000000000 R14: 0000000000000007 R15: 0000000000000000
[   50.019984][ T5307]  </TASK>
[   50.023826][ T5307] Kernel Offset: disabled
[   50.028304][ T5307] Rebooting in 86400 seconds..


syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build2871270070=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
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'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 85deaf45cc
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=85deaf45cc57320362fabb5ef83eb8cf413f4274 -X github.com/google/syzkaller/prog.gitRevisionDate=20250722-150712"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -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 -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"85deaf45cc57320362fabb5ef83eb8cf413f4274\"
/usr/bin/ld: /tmp/ccMQNojd.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=11d894f0580000


Tested on:

commit:         9ee814bd Add linux-next specific files for 20250724
git tree:       linux-next
kernel config:  https://syzkaller.appspot.com/x/.config?x=83210eaba5794b83
dashboard link: https://syzkaller.appspot.com/bug?extid=0fc08dad8f34563208d5
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11c610a2580000

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