Re: [syzbot] [xfs?] WARNING in __xfs_healthmon_insert

From: syzbot

Date: Sun Sep 06 2026 - 08:38:11 EST

Hello,

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

**
[ 2.229514][ T0] ** **
[ 2.233723][ T0] ** Use hash_pointers=always to force this mode off **
[ 2.237896][ T0] ** **
[ 2.241110][ T0] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **
[ 2.246058][ T0] **********************************************************
[ 2.253226][ T0] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=2
[ 2.383135][ T0] allocated 167772160 bytes of page_ext
[ 2.388307][ T0] Node 0, zone DMA: page owner found early allocated 0 pages
[ 2.409204][ T0] Node 0, zone DMA32: page owner found early allocated 21251 pages
[ 2.419597][ T0] Node 0, zone Normal: page owner found early allocated 0 pages
[ 2.437217][ T0] Node 1, zone Normal: page owner found early allocated 19847 pages
[ 2.441395][ T0] Kernel/User page tables isolation: enabled
[ 2.447279][ T0] Dynamic Preempt: full
[ 2.451679][ T0] Running RCU self tests
[ 2.453909][ T0] Running RCU synchronous self tests
[ 2.457068][ T0] rcu: Preemptible hierarchical RCU implementation.
[ 2.459974][ T0] rcu: RCU lockdep checking is enabled.
[ 2.462985][ T0] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2.
[ 2.467577][ T0] rcu: RCU callback double-/use-after-free debug is enabled.
[ 2.470329][ T0] rcu: RCU debug extended QS entry/exit.
[ 2.473542][ T0] All grace periods are expedited (rcu_expedited).
[ 2.478396][ T0] Trampoline variant of Tasks RCU enabled.
[ 2.480609][ T0] Tracing variant of Tasks RCU enabled.
[ 2.484890][ T0] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[ 2.491630][ T0] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
[ 2.496883][ T0] Running RCU synchronous self tests
[ 2.500611][ T0] RCU Tasks: Setting shift to 1 and lim to 1 rcu_task_cb_adjust=1 rcu_task_cpu_ids=2.
[ 2.713553][ T0] NR_IRQS: 4352, nr_irqs: 440, preallocated irqs: 16
[ 2.718843][ T0] rcu: srcu_init: Setting srcu_struct sizes based on contention.
[ 2.721660][ T0] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 2.727899][ T0] kfence: initialized - using 2097152 bytes for 255 objects at 0xffff88823be00000-0xffff88823c000000
[ 2.736339][ T0] Console: colour VGA+ 80x25
[ 2.739581][ T0] printk: console [ttyS0] enabled
[ 2.739581][ T0] printk: console [ttyS0] enabled
[ 2.745417][ T0] printk: legacy bootconsole [earlyser0] disabled
[ 2.745417][ T0] printk: legacy bootconsole [earlyser0] disabled
[ 2.755402][ T0] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
[ 2.761508][ T0] ... MAX_LOCKDEP_SUBCLASSES: 8
[ 2.765566][ T0] ... MAX_LOCK_DEPTH: 48
[ 2.769174][ T0] ... MAX_LOCKDEP_KEYS: 8192
[ 2.771511][ T0] ... CLASSHASH_SIZE: 4096
[ 2.776241][ T0] ... MAX_LOCKDEP_ENTRIES: 1048576
[ 2.780925][ T0] ... MAX_LOCKDEP_CHAINS: 1048576
[ 2.785270][ T0] ... CHAINHASH_SIZE: 524288
[ 2.788257][ T0] memory used by lock dependency info: 106625 kB
[ 2.791971][ T0] memory used for stack traces: 8320 kB
[ 2.795131][ T0] per task-struct memory footprint: 1920 bytes
[ 2.801380][ T0] mempolicy: Enabling automatic NUMA balancing. Configure with numa_balancing= or the kernel.numa_balancing sysctl
[ 2.809521][ T0] ACPI: Core revision 20260408
[ 2.815089][ T0] APIC: Switch to symmetric I/O mode setup
[ 2.819588][ T0] x2apic enabled
[ 2.832365][ T0] APIC: Switched APIC routing to: physical x2apic
[ 2.853659][ T0] ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1
[ 2.859580][ T0] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x1fb63109b96, max_idle_ns: 440795265316 ns
[ 2.867348][ T0] Calibrating delay loop (skipped) preset value.. 4399.99 BogoMIPS (lpj=21999980)
[ 2.873587][ T0] Last level iTLB entries: 4KB 64, 2MB 8, 4MB 8
[ 2.877349][ T0] Last level dTLB entries: 4KB 64, 2MB 32, 4MB 32, 1GB 4
[ 2.881761][ T0] mitigations: Enabled attack vectors: user_kernel, user_user, guest_host, guest_guest, SMT mitigations: auto
[ 2.887349][ T0] Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl
[ 2.897352][ T0] Spectre V2 : Mitigation: IBRS
[ 2.899868][ T0] RETBleed: Mitigation: IBRS
[ 2.903522][ T0] ITS: Mitigation: Aligned branch/return thunks
[ 2.907358][ T0] Spectre V2 : User space: Mitigation: STIBP via prctl
[ 2.910650][ T0] MDS: Mitigation: Clear CPU buffers
[ 2.914273][ T0] TAA: Mitigation: Clear CPU buffers
[ 2.917351][ T0] MMIO Stale Data: Vulnerable: Clear CPU buffers attempted, no microcode
[ 2.922442][ T0] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
[ 2.927360][ T0] Spectre V2 : Spectre v2 / SpectreRSB: Filling RSB on context switch and VMEXIT
[ 2.934375][ T0] Spectre V2 : Enabling IBPB for BPF
[ 2.937374][ T0] Spectre V2 : mitigation: Enabling conditional Indirect Branch Prediction Barrier
[ 2.947399][ T0] active return thunk: its_return_thunk
[ 2.957351][ T0] Spectre V2 : Spectre BHI mitigation: SW BHB clearing on syscall and VM exit
[ 2.967425][ T0] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
[ 2.977358][ T0] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
[ 2.987355][ T0] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
[ 2.997353][ T0] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256
[ 3.007352][ T0] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
[ 3.019716][ T0] ------------[ cut here ]------------
[ 3.027355][ T0] CPA detected W^X violation: 8000000000000023 -> 0000000000000023 range: 0xffffffffa0000000 - 0xffffffffa0000fff PFN 140600
[ 3.037350][ T0] WARNING: arch/x86/mm/pat/set_memory.c:725 at __change_page_attr_set_clr+0x1d69/0x2820, CPU#0: swapper/0/0
[ 3.047350][ T0] Modules linked in:
[ 3.052129][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
[ 3.057349][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 3.067364][ T0] RIP: 0010:__change_page_attr_set_clr+0x1d79/0x2820
[ 3.077360][ T0] Code: 00 00 e8 ba 6c 4d 00 48 8b 4c 24 30 4c 8d 81 ff 0f 00 00 48 8d 3d 07 be 02 0f 48 8b b4 24 a0 00 00 00 4c 89 f2 4c 8b 4c 24 50 <67> 48 0f b9 3a e9 8d 00 00 00 e8 88 6c 4d 00 4c 89 f8 48 c1 e8 03
[ 3.087350][ T0] RSP: 0000:ffffffff8ea07820 EFLAGS: 00010293
[ 3.096327][ T0] RAX: ffffffff817a6b66 RBX: 8000000140600023 RCX: ffffffffa0000000
[ 3.097366][ T0] RDX: 0000000000000023 RSI: 8000000000000023 RDI: ffffffff907d2980
[ 3.107078][ T0] RBP: ffffffff8ea07ad0 R08: ffffffffa0000fff R09: 0000000000140600
[ 3.107356][ T0] R10: dffffc0000000000 R11: fffffbfff1d40ef4 R12: 8000000000000000
[ 3.116343][ T0] R13: 0000000000000002 R14: 0000000000000023 R15: 8000000000000002
[ 3.117351][ T0] FS: 0000000000000000(0000) GS:ffff888124cbf000(0000) knlGS:0000000000000000
[ 3.127353][ T0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3.137351][ T0] CR2: ffff88823ffff000 CR3: 000000000eb48000 CR4: 00000000003506f0
[ 3.147353][ T0] Call Trace:
[ 3.155514][ T0] <TASK>
[ 3.157371][ T0] ? __pfx___mutex_unlock_slowpath+0x10/0x10
[ 3.167355][ T0] ? __purge_vmap_area_lazy+0x964/0xb40
[ 3.177369][ T0] ? __pfx___change_page_attr_set_clr+0x10/0x10
[ 3.187351][ T0] ? __might_resched+0x71/0x4c0
[ 3.197359][ T0] ? down_read+0x2b9/0x320
[ 3.207354][ T0] change_page_attr_set_clr+0x398/0x11d0
[ 3.217363][ T0] ? __pfx_change_page_attr_set_clr+0x10/0x10
[ 3.227371][ T0] ? trace_kmalloc+0x2a/0xf0
[ 3.237364][ T0] set_memory_x+0xd6/0x110
[ 3.247357][ T0] ? __pfx_set_memory_x+0x10/0x10
[ 3.255074][ T0] apply_retpolines+0x8e9/0x15a0
[ 3.257361][ T0] ? events_sysfs_show+0xdd/0xf0
[ 3.267354][ T0] ? __pfx_apply_retpolines+0x10/0x10
[ 3.277371][ T0] ? events_sysfs_show+0xdd/0xf0
[ 3.287351][ T0] ? events_sysfs_show+0xec/0xf0
[ 3.294334][ T0] ? events_sysfs_show+0xe3/0xf0
[ 3.297368][ T0] ? unregister_die_notifier+0x43/0x50
[ 3.307357][ T0] ? __pfx_int3_selftest+0x10/0x10
[ 3.317362][ T0] alternative_instructions+0x3a/0x100
[ 3.327363][ T0] arch_cpu_finalize_init+0xb2/0x1f0
[ 3.337361][ T0] start_kernel+0x310/0x3e0
[ 3.347358][ T0] x86_64_start_reservations+0x24/0x30
[ 3.357360][ T0] x86_64_start_kernel+0x137/0x1b0
[ 3.363886][ T0] common_startup_64+0x13e/0x157
[ 3.367365][ T0] </TASK>
[ 3.377357][ T0] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 3.387329][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
[ 3.387329][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 3.387329][ T0] Call Trace:
[ 3.387329][ T0] <TASK>
[ 3.387329][ T0] vpanic+0x56d/0xa70
[ 3.387329][ T0] ? __pfx__printk+0x10/0x10
[ 3.387329][ T0] ? __pfx_vpanic+0x10/0x10
[ 3.387329][ T0] ? is_bpf_text_address+0x292/0x2b0
[ 3.387329][ T0] ? is_bpf_text_address+0x26/0x2b0
[ 3.387329][ T0] panic+0xc5/0xd0
[ 3.387329][ T0] ? __pfx_panic+0x10/0x10
[ 3.387329][ T0] ? common_startup_64+0x13e/0x157
[ 3.387329][ T0] __warn+0x315/0x4c0
[ 3.387329][ T0] ? __change_page_attr_set_clr+0x1d69/0x2820
[ 3.387329][ T0] ? __change_page_attr_set_clr+0x1d69/0x2820
[ 3.387329][ T0] __report_bug+0x276/0x570
[ 3.387329][ T0] ? __change_page_attr_set_clr+0x1d69/0x2820
[ 3.387329][ T0] ? __pfx___report_bug+0x10/0x10
[ 3.387329][ T0] report_bug_entry+0x19b/0x290
[ 3.387329][ T0] ? __change_page_attr_set_clr+0x1d79/0x2820
[ 3.387329][ T0] ? __change_page_attr_set_clr+0x1d7e/0x2820
[ 3.387329][ T0] handle_bug+0xce/0x200
[ 3.387329][ T0] exc_invalid_op+0x1a/0x50
[ 3.387329][ T0] asm_exc_invalid_op+0x1a/0x20
[ 3.387329][ T0] RIP: 0010:__change_page_attr_set_clr+0x1d79/0x2820
[ 3.387329][ T0] Code: 00 00 e8 ba 6c 4d 00 48 8b 4c 24 30 4c 8d 81 ff 0f 00 00 48 8d 3d 07 be 02 0f 48 8b b4 24 a0 00 00 00 4c 89 f2 4c 8b 4c 24 50 <67> 48 0f b9 3a e9 8d 00 00 00 e8 88 6c 4d 00 4c 89 f8 48 c1 e8 03
[ 3.387329][ T0] RSP: 0000:ffffffff8ea07820 EFLAGS: 00010293
[ 3.387329][ T0] RAX: ffffffff817a6b66 RBX: 8000000140600023 RCX: ffffffffa0000000
[ 3.387329][ T0] RDX: 0000000000000023 RSI: 8000000000000023 RDI: ffffffff907d2980
[ 3.387329][ T0] RBP: ffffffff8ea07ad0 R08: ffffffffa0000fff R09: 0000000000140600
[ 3.387329][ T0] R10: dffffc0000000000 R11: fffffbfff1d40ef4 R12: 8000000000000000
[ 3.387329][ T0] R13: 0000000000000002 R14: 0000000000000023 R15: 8000000000000002
[ 3.387329][ T0] ? __change_page_attr_set_clr+0x1d56/0x2820
[ 3.387329][ T0] ? __pfx___mutex_unlock_slowpath+0x10/0x10
[ 3.387329][ T0] ? __purge_vmap_area_lazy+0x964/0xb40
[ 3.387329][ T0] ? __pfx___change_page_attr_set_clr+0x10/0x10
[ 3.387329][ T0] ? __might_resched+0x71/0x4c0
[ 3.387329][ T0] ? down_read+0x2b9/0x320
[ 3.387329][ T0] change_page_attr_set_clr+0x398/0x11d0
[ 3.387329][ T0] ? __pfx_change_page_attr_set_clr+0x10/0x10
[ 3.387329][ T0] ? trace_kmalloc+0x2a/0xf0
[ 3.387329][ T0] set_memory_x+0xd6/0x110
[ 3.387329][ T0] ? __pfx_set_memory_x+0x10/0x10
[ 3.387329][ T0] apply_retpolines+0x8e9/0x15a0
[ 3.387329][ T0] ? events_sysfs_show+0xdd/0xf0
[ 3.387329][ T0] ? __pfx_apply_retpolines+0x10/0x10
[ 3.387329][ T0] ? events_sysfs_show+0xdd/0xf0
[ 3.387329][ T0] ? events_sysfs_show+0xec/0xf0
[ 3.387329][ T0] ? events_sysfs_show+0xe3/0xf0
[ 3.387329][ T0] ? unregister_die_notifier+0x43/0x50
[ 3.387329][ T0] ? __pfx_int3_selftest+0x10/0x10
[ 3.387329][ T0] alternative_instructions+0x3a/0x100
[ 3.387329][ T0] arch_cpu_finalize_init+0xb2/0x1f0
[ 3.387329][ T0] start_kernel+0x310/0x3e0
[ 3.387329][ T0] x86_64_start_reservations+0x24/0x30
[ 3.387329][ T0] x86_64_start_kernel+0x137/0x1b0
[ 3.387329][ T0] common_startup_64+0x13e/0x157
[ 3.387329][ T0] </TASK>
[ 3.387329][ T0] 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-build713299113=/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='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 801f0966669
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}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=801f0966669a37e048adabf9e5f38ce52825ea82 -X github.com/google/syzkaller/prog.gitRevisionDate=20260903-143617" ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=801f0966669a37e048adabf9e5f38ce52825ea82 -X github.com/google/syzkaller/prog.gitRevisionDate=20260903-143617" ./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=801f0966669a37e048adabf9e5f38ce52825ea82 -X github.com/google/syzkaller/prog.gitRevisionDate=20260903-143617" -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=\"801f0966669a37e048adabf9e5f38ce52825ea82\"
/usr/bin/ld: /tmp/ccc7XvCA.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null

Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=12651b49580000

Tested on:

commit: af5f1280 Add linux-next specific files for 20260904
git tree: linux-next
kernel config: https://syzkaller.appspot.com/x/.config?x=bb4a32c282cc2ec7
dashboard link: https://syzkaller.appspot.com/bug?extid=ccdf3469f5f653bff7ac
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=16c732f9580000