19-Sep-2026 10:10:06: building syzkaller on b13552fed1cdc2826f57a5741df12ca67130314a...
19-Sep-2026 10:15:09: fetching kernel...
19-Sep-2026 10:15:14: checked out kernel commit 3f2425f5b5bbbdd991ca9cdfd5502e68d8895998 ("Add linux-next specific files for 20260918", 2026-09-18 14:39:06 +0100 +0100)
19-Sep-2026 10:15:14: cleaning kernel...
19-Sep-2026 10:25:11: building kernel...
19-Sep-2026 10:39:28: kernel built successfully with compiler Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
19-Sep-2026 10:39:28: testing patch...
19-Sep-2026 10:50:01: aggregating test results failed: WARNING in __change_page_attr_set_clr
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
kfence: initialized - using 2097152 bytes for 255 objects at 0xffff88823be00000-0xffff88823c000000
Console: colour VGA+ 80x25
printk: console [ttyS0] enabled
printk: console [ttyS0] enabled
printk: legacy bootconsole [earlyser0] disabled
printk: legacy bootconsole [earlyser0] disabled
Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
... MAX_LOCKDEP_SUBCLASSES: 8
... MAX_LOCK_DEPTH: 48
... MAX_LOCKDEP_KEYS: 8192
... CLASSHASH_SIZE: 4096
... MAX_LOCKDEP_ENTRIES: 1048576
... MAX_LOCKDEP_CHAINS: 1048576
... CHAINHASH_SIZE: 524288
memory used by lock dependency info: 106625 kB
memory used for stack traces: 8320 kB
per task-struct memory footprint: 1920 bytes
mempolicy: Enabling automatic NUMA balancing. Configure with numa_balancing= or the kernel.numa_balancing sysctl
ACPI: Core revision 20260408
APIC: Switch to symmetric I/O mode setup
x2apic enabled
APIC: Switched APIC routing to: physical x2apic
..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1
clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x1fb63109b96, max_idle_ns: 440795265316 ns
Calibrating delay loop (skipped) preset value.. 4399.99 BogoMIPS (lpj=21999980)
Last level iTLB entries: 4KB 64, 2MB 8, 4MB 8
Last level dTLB entries: 4KB 64, 2MB 32, 4MB 32, 1GB 4
mitigations: Enabled attack vectors: user_kernel, user_user, guest_host, guest_guest, SMT mitigations: auto
Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl
Spectre V2 : Mitigation: IBRS
RETBleed: Mitigation: IBRS
ITS: Mitigation: Aligned branch/return thunks
Spectre V2 : User space: Mitigation: STIBP via prctl
MDS: Mitigation: Clear CPU buffers
TAA: Mitigation: Clear CPU buffers
MMIO Stale Data: Vulnerable: Clear CPU buffers attempted, no microcode
Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
Spectre V2 : Spectre v2 / SpectreRSB: Filling RSB on context switch and VMEXIT
Spectre V2 : Enabling IBPB for BPF
Spectre V2 : mitigation: Enabling conditional Indirect Branch Prediction Barrier
active return thunk: its_return_thunk
Spectre V2 : Spectre BHI mitigation: SW BHB clearing on syscall and VM exit
x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256
x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
------------[ cut here ]------------
CPA detected W^X violation: 8000000000000023 -> 0000000000000023 range: 0xffffffffa0000000 - 0xffffffffa0000fff PFN 1b200
WARNING: arch/x86/mm/pat/set_memory.c:725 at verify_rwx arch/x86/mm/pat/set_memory.c:722 [inline], CPU#0: swapper/0/0
WARNING: arch/x86/mm/pat/set_memory.c:725 at __change_page_attr arch/x86/mm/pat/set_memory.c:1892 [inline], CPU#0: swapper/0/0
WARNING: arch/x86/mm/pat/set_memory.c:725 at __change_page_attr_set_clr+0x1d69/0x2820 arch/x86/mm/pat/set_memory.c:2064, CPU#0: swapper/0/0
Modules linked in:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:verify_rwx arch/x86/mm/pat/set_memory.c:722 [inline]
RIP: 0010:__change_page_attr arch/x86/mm/pat/set_memory.c:1892 [inline]
RIP: 0010:__change_page_attr_set_clr+0x1d79/0x2820 arch/x86/mm/pat/set_memory.c:2064
Code: 00 00 e8 8a 2e 4e 00 48 8b 4c 24 30 4c 8d 81 ff 0f 00 00 48 8d 3d 27 24 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 58 2e 4e 00 4c 89 f8 48 c1 e8 03
RSP: 0000:ffffffff8ea07820 EFLAGS: 00010293
RAX: ffffffff817aa2e6 RBX: 800000001b200023 RCX: ffffffffa0000000
RDX: 0000000000000023 RSI: 8000000000000023 RDI: ffffffff907cc720
RBP: ffffffff8ea07ad0 R08: ffffffffa0000fff R09: 000000000001b200
R10: dffffc0000000000 R11: fffffbfff1d40ef4 R12: 8000000000000000
R13: 0000000000000002 R14: 0000000000000023 R15: 8000000000000002
FS: 0000000000000000(0000) GS:ffff888124cba000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823ffff000 CR3: 000000000eb48000 CR4: 00000000003506f0
Call Trace:
change_page_attr_set_clr+0x398/0x11d0 arch/x86/mm/pat/set_memory.c:2152
change_page_attr_clear arch/x86/mm/pat/set_memory.c:2190 [inline]
set_memory_x+0xd6/0x110 arch/x86/mm/pat/set_memory.c:2351
its_alloc arch/x86/kernel/alternative.c:236 [inline]
its_allocate_thunk arch/x86/kernel/alternative.c:258 [inline]
emit_its_trampoline arch/x86/kernel/alternative.c:834 [inline]
patch_retpoline arch/x86/kernel/alternative.c:945 [inline]
apply_retpolines+0x8e9/0x15a0 arch/x86/kernel/alternative.c:1010
alternative_instructions+0x3a/0x100 arch/x86/kernel/alternative.c:2289
arch_cpu_finalize_init+0xb2/0x1f0 arch/x86/kernel/cpu/common.c:2641
start_kernel+0x315/0x3e0 init/main.c:1160
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x157
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: e8 8a 2e 4e 00 call 0x4e2e91
7: 48 8b 4c 24 30 mov 0x30(%rsp),%rcx
c: 4c 8d 81 ff 0f 00 00 lea 0xfff(%rcx),%r8
13: 48 8d 3d 27 24 02 0f lea 0xf022427(%rip),%rdi # 0xf022441
1a: 48 8b b4 24 a0 00 00 mov 0xa0(%rsp),%rsi
21: 00
22: 4c 89 f2 mov %r14,%rdx
25: 4c 8b 4c 24 50 mov 0x50(%rsp),%r9
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: e9 8d 00 00 00 jmp 0xc1
34: e8 58 2e 4e 00 call 0x4e2e91
39: 4c 89 f8 mov %r15,%rax
3c: 48 c1 e8 03 shr $0x3,%rax
failed to run ["ssh" "-p" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "root@10.128.1.169" "pwd"]: exit status 255
ssh: connect to host 10.128.1.169 port 22: Connection timed out
Pseudo-terminal will not be allocated because stdin is not a terminal.
Warning: Permanently added '[us-central1-ssh-serialport.googleapis.com]:9600' (ECDSA) to the list of known hosts.
SeaBIOS (version 1.8.2-google)
Total RAM Size = 0x0000000200000000 = 8192 MiB
CPUs found: 2 Max CPUs supported: 2
SeaBIOS (version 1.8.2-google)
Machine UUID e758ef56-42d4-f37a-8983-cd929e7d1704
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f25d0: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Sending Seabios boot VM event.
Booting from Hard Disk 0...
[ 0.000000][ T0] Linux version syzkaller (syzkaller@syzkaller) (Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8) #0 SMP PREEMPT_DYNAMIC now
[ 0.000000][ T0] Command line: BOOT_IMAGE=/boot/bzImage root=/dev/sda1 console=ttyS0
[ 0.000000][ T0] KERNEL supported cpus:
[ 0.000000][ T0] Intel GenuineIntel
[ 0.000000][ T0] AMD AuthenticAMD
[ 0.000000][ T0] x86/CPU: Model not found in latest microcode list
[ 0.000000][ T0] BIOS-provided physical RAM map:
[ 0.000000][ T0] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] System RAM
[ 0.000000][ T0] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] device reserved
[ 0.000000][ T0] BIOS-e820: [gap 0x00000000000a0000-0x00000000000effff]
[ 0.000000][ T0] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] device reserved
[ 0.000000][ T0] BIOS-e820: [mem 0x0000000000100000-0x00000000bfffcfff] System RAM
[ 0.000000][ T0] BIOS-e820: [mem 0x00000000bfffd000-0x00000000bfffffff] device reserved
[ 0.000000][ T0] BIOS-e820: [gap 0x00000000c0000000-0x00000000fffbbfff]
[ 0.000000][ T0] BIOS-e820: [mem 0x00000000fffbc000-0x00000000ffffffff] device reserved
[ 0.000000][ T0] BIOS-e820: [mem 0x0000000100000000-0x000000023fffffff] System RAM
[ 0.000000][ T0] printk: legacy bootconsole [earlyser0] enabled
[ 0.000000][ T0] ERROR: earlyprintk= earlyser already used
[ 0.000000][ T0] ERROR: earlyprintk= earlyser already used
[ 0.000000][ T0] Hash pointers mode set to never.
[ 0.000000][ T0] Malformed early option 'vsyscall'
[ 0.000000][ T0] nopcid: PCID feature disabled
[ 0.000000][ T0] NX (Execute Disable) protection: active
[ 0.000000][ T0] APIC: Static calls initialized
[ 0.000000][ T0] DMI: SMBIOS 2.4 present.
[ 0.000000][ T0] DMI: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 0.000000][ T0] DMI: Memory slots populated: 1/1
[ 0.000000][ T0] Hypervisor detected: KVM
[ 0.000000][ T0] last_pfn = 0xbfffd max_arch_pfn = 0x400000000
[ 0.000000][ T0] kvm-clock: Using msrs 4b564d01 and 4b564d00
[ 0.000008][ T0] kvm-clock: using sched offset of 19486143162 cycles
[ 0.009453][ T0] clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns
[ 0.035547][ T0] tsc: Detected 2199.998 MHz processor
[ 0.049609][ T0] last_pfn = 0x240000 max_arch_pfn = 0x400000000
[ 0.058561][ T0] MTRR map: 4 entries (3 fixed + 1 variable; max 19), built from 8 variable MTRRs
[ 0.074302][ T0] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WP UC- WT
[ 0.085670][ T0] last_pfn = 0xbfffd max_arch_pfn = 0x400000000
[ 0.103869][ T0] found SMP MP-table at [mem 0x000f2890-0x000f289f]
[ 0.116914][ T0] Using GB pages for direct mapping
[ 0.133591][ T0] ACPI: Early table checksum verification disabled
[ 0.147954][ T0] ACPI: RSDP 0x00000000000F2610 000014 (v00 Google)
[ 0.159839][ T0] ACPI: RSDT 0x00000000BFFFFFB0 000038 (v01 Google GOOGRSDT 00000001 GOOG 00000001)
[ 0.182440][ T0] ACPI: FACP 0x00000000BFFFF370 0000F4 (v02 Google GOOGFACP 00000001 GOOG 00000001)
[ 0.200687][ T0] ACPI: DSDT 0x00000000BFFFD900 001A64 (v01 Google GOOGDSDT 00000001 GOOG 00000001)
[ 0.218496][ T0] ACPI: FACS 0x00000000BFFFD8C0 000040
[ 0.228843][ T0] ACPI: FACS 0x00000000BFFFD8C0 000040
[ 0.237733][ T0] ACPI: SRAT 0x00000000BFFFFEA0 0000C8 (v03 Google GOOGSRAT 00000001 GOOG 00000001)
[ 0.254261][ T0] ACPI: APIC 0x00000000BFFFFDF0 000076 (v05 Google GOOGAPIC 00000001 GOOG 00000001)
[ 0.270243][ T0] ACPI: SSDT 0x00000000BFFFF470 000980 (v01 Google GOOGSSDT 00000001 GOOG 00000001)
[ 0.288979][ T0] ACPI: WAET 0x00000000BFFFFE70 000028 (v01 Google GOOGWAET 00000001 GOOG 00000001)
[ 0.315093][ T0] ACPI: Reserving FACP table memory at [mem 0xbffff370-0xbffff463]
[ 0.327425][ T0] ACPI: Reserving DSDT table memory at [mem 0xbfffd900-0xbffff363]
[ 0.340014][ T0] ACPI: Reserving FACS table memory at [mem 0xbfffd8c0-0xbfffd8ff]
[ 0.367679][ T0] ACPI: Reserving FACS table memory at [mem 0xbfffd8c0-0xbfffd8ff]
[ 0.386685][ T0] ACPI: Reserving SRAT table memory at [mem 0xbffffea0-0xbfffff67]
[ 0.411367][ T0] ACPI: Reserving APIC table memory at [mem 0xbffffdf0-0xbffffe65]
[ 0.426187][ T0] ACPI: Reserving SSDT table memory at [mem 0xbffff470-0xbffffdef]
[ 0.446348][ T0] ACPI: Reserving WAET table memory at [mem 0xbffffe70-0xbffffe97]
[ 0.466722][ T0] ACPI: SRAT: Node 0 PXM 0 [mem 0x00000000-0x0009ffff]
[ 0.489032][ T0] ACPI: SRAT: Node 0 PXM 0 [mem 0x00100000-0xbfffffff]
[ 0.504795][ T0] ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0x23fffffff]
[ 0.520701][ T0] NUMA: Node 0 [mem 0x00001000-0x0009ffff] + [mem 0x00100000-0xbfffffff] -> [mem 0x00001000-0xbfffffff]
[ 0.542624][ T0] NUMA: Node 0 [mem 0x00001000-0xbfffffff] + [mem 0x100000000-0x23fffffff] -> [mem 0x00001000-0x23fffffff]
[ 0.560583][ T0] Faking node 0 at [mem 0x0000000000001000-0x0000000140000fff] (5120MB)
[ 0.574850][ T0] Faking node 1 at [mem 0x0000000140001000-0x000000023fffffff] (4095MB)
[ 0.588637][ T0] NODE_DATA(0) allocated [mem 0x13fffb100-0x140000fff]
[ 0.598304][ T0] NODE_DATA(1) allocated [mem 0x23fff7100-0x23fffcfff]
[ 1.088646][ T0] KernelAddressSanitizer initialized (generic)
[ 1.102657][ T0] ACPI: PM-Timer IO Port: 0xb008
[ 1.113123][ T0] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[ 1.125229][ T0] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[ 1.141761][ T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
[ 1.153814][ T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[ 1.167649][ T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
[ 1.182883][ T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
[ 1.195235][ T0] ACPI: Using ACPI (MADT) for SMP configuration information
[ 1.207506][ T0] CPU topo: Max. logical packages: 1
[ 1.218094][ T0] CPU topo: Max. logical nodes: 1
[ 1.225376][ T0] CPU topo: Num. nodes per package: 1
[ 1.235316][ T0] CPU topo: Max. logical dies: 1
[ 1.243317][ T0] CPU topo: Max. dies per package: 1
[ 1.252472][ T0] CPU topo: Max. threads per core: 2
[ 1.260126][ T0] CPU topo: Num. cores per package: 1
[ 1.267494][ T0] CPU topo: Num. threads per package: 2
[ 1.274053][ T0] CPU topo: Allowing 2 present CPUs plus 0 hotplug CPUs
[ 1.282780][ T0] PM: hibernation: Registered nosave memory: [mem 0x00000000-0x00000fff]
[ 1.293411][ T0] PM: hibernation: Registered nosave memory: [mem 0x0009f000-0x000fffff]
[ 1.303743][ T0] PM: hibernation: Registered nosave memory: [mem 0xbfffd000-0xffffffff]
[ 1.314782][ T0] [gap 0xc0000000-0xfffbbfff] available for PCI devices
[ 1.323873][ T0] Booting paravirtualized kernel on KVM
[ 1.332471][ T0] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 1.487652][ T0] Zone ranges:
[ 1.493540][ T0] DMA [mem 0x0000000000001000-0x0000000000ffffff]
[ 1.509195][ T0] DMA32 [mem 0x0000000001000000-0x00000000ffffffff]
[ 1.521099][ T0] Normal [mem 0x0000000100000000-0x000000023fffffff]
[ 1.536274][ T0] Device empty
[ 1.541003][ T0] Movable zone start for each node
[ 1.550855][ T0] Early memory node ranges
[ 1.556956][ T0] node 0: [mem 0x0000000000001000-0x000000000009efff]
[ 1.569599][ T0] node 0: [mem 0x0000000000100000-0x00000000bfffcfff]
[ 1.585999][ T0] node 0: [mem 0x0000000100000000-0x0000000140000fff]
[ 1.606261][ T0] node 1: [mem 0x0000000140001000-0x000000023fffffff]
[ 1.617128][ T0] Initmem setup node 0 [mem 0x0000000000001000-0x0000000140000fff]
[ 1.631439][ T0] Initmem setup node 1 [mem 0x0000000140001000-0x000000023fffffff]
[ 1.693895][ T0] On node 0, zone DMA: 1 pages in unavailable ranges
[ 1.704087][ T0] On node 0, zone DMA: 97 pages in unavailable ranges
[ 1.828567][ T0] On node 0, zone Normal: 3 pages in unavailable ranges
[ 1.939902][ T0] setup_percpu: NR_CPUS:8 nr_cpumask_bits:2 nr_cpu_ids:2 nr_node_ids:2
[ 1.950253][ T0] percpu: Embedded 72 pages/cpu s254728 r8192 d31992 u1048576
[ 1.960469][ T0] kvm-guest: PV spinlocks enabled
[ 1.968785][ T0] PV qspinlock hash table entries: 256 (order: 0, 4096 bytes, linear)
[ 1.979436][ T0] Kernel command line: earlyprintk=serial net.ifnames=0 sysctl.kernel.hung_task_all_cpu_backtrace=1 ima_policy=tcb nf-conntrack-ftp.ports=20000 nf-conntrack-tftp.ports=20000 nf-conntrack-sip.ports=20000 nf-conntrack-irc.ports=20000 nf-conntrack-sane.ports=20000 binder.debug_mask=0 rcupdate.rcu_expedited=1 rcupdate.rcu_cpu_stall_cputime=1 no_hash_pointers page_owner=on sysctl.vm.nr_hugepages=4 sysctl.vm.nr_overcommit_hugepages=4 secretmem.enable=1 sysctl.max_rcu_stall_to_panic=1 msr.allow_writes=off coredump_filter=0xffff root=/dev/sda console=ttyS0 vsyscall=native numa=fake=2 kvm-intel.nested=1 spec_store_bypass_disable=prctl nopcid vivid.n_devs=64 vivid.multiplanar=1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2 netrom.nr_ndevs=32 rose.rose_ndevs=32 smp.csd_lock_timeout=100000 watchdog_thresh=55 workqueue.watchdog_thresh=140 sysctl.net.core.netdev_unregister_timeout_secs=140 dummy_hcd.num=32 max_loop=32 nbds_max=32 \
[ 2.091296][ T0] Kernel command line: comedi.comedi_num_legacy_minors=4 panic_on_warn=1 BOOT_IMAGE=/boot/bzImage root=/dev/sda1 console=ttyS0
[ 2.115995][ T0] Unknown kernel command line parameters "nbds_max=32", will be passed to user space.
[ 2.133452][ T0] random: crng init done
[ 2.138451][ T0] printk: log buffer data + meta data: 262144 + 917504 = 1179648 bytes
[ 2.149203][ T0] software IO TLB: area num 2.
[ 2.191732][ T0] Fallback order for Node 0: 0 1
[ 2.191758][ T0] Fallback order for Node 1: 1 0
[ 2.191772][ T0] Built 2 zonelists, mobility grouping on. Total pages: 2097051
[ 2.212203][ T0] Policy zone: Normal
[ 2.217088][ T0] mem auto-init: stack:all(zero), heap alloc:on, heap free:off
[ 2.225924][ T0] stackdepot: allocating hash table via alloc_large_system_hash
[ 2.236603][ T0] stackdepot hash table entries: 1048576 (order: 12, 16777216 bytes, linear)
[ 2.251794][ T0] stackdepot: allocating space for 8192 stack pools via memblock
[ 3.254423][ T0] **********************************************************
[ 3.268052][ T0] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **
[ 3.278854][ T0] ** **
[ 3.292309][ T0] ** This system shows unhashed kernel memory addresses **
[ 3.304215][ T0] ** via the console, logs, and other interfaces. This **
[ 3.312556][ T0] ** might reduce the security of your system. **
[ 3.326843][ T0] ** **
[ 3.336571][ T0] ** If you see this message and you are not debugging **
[ 3.348780][ T0] ** the kernel, report this immediately to your system **
[ 3.360454][ T0] ** administrator! **
[ 3.373012][ T0] ** serialport: Connected to syzkaller.us-central1-c.ci-upstream-linux-next-kasan-gce-root-test-job-parallel-2 port 1 (session ID: 89a03908320a7a7ca910667d9826c6c9ee74b7b9662bb208cf2978fba1995237, active connections: 1).
**
[ 3.387063][ T0] ** Use hash_pointers=always to force this mode off **
[ 3.398561][ T0] ** **
[ 3.411074][ T0] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **
[ 3.424084][ T0] **********************************************************
[ 3.442667][ T0] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=2
[ 3.580518][ T0] allocated 167772160 bytes of page_ext
[ 3.587138][ T0] Node 0, zone DMA: page owner found early allocated 0 pages
[ 3.612492][ T0] Node 0, zone DMA32: page owner found early allocated 21251 pages
[ 3.631604][ T0] Node 0, zone Normal: page owner found early allocated 0 pages
[ 3.657724][ T0] Node 1, zone Normal: page owner found early allocated 19847 pages
[ 3.668825][ T0] Kernel/User page tables isolation: enabled
[ 3.677344][ T0] Dynamic Preempt: full
[ 3.684751][ T0] Running RCU self tests
[ 3.690076][ T0] Running RCU synchronous self tests
[ 3.697555][ T0] rcu: Preemptible hierarchical RCU implementation.
[ 3.705835][ T0] rcu: RCU lockdep checking is enabled.
[ 3.711974][ T0] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2.
[ 3.721833][ T0] rcu: RCU callback double-/use-after-free debug is enabled.
[ 3.729946][ T0] rcu: RCU debug extended QS entry/exit.
[ 3.739679][ T0] All grace periods are expedited (rcu_expedited).
[ 3.748696][ T0] Trampoline variant of Tasks RCU enabled.
[ 3.757545][ T0] Tracing variant of Tasks RCU enabled.
[ 3.764829][ T0] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[ 3.777307][ T0] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
[ 3.786792][ T0] Running RCU synchronous self tests
[ 3.793702][ T0] RCU Tasks: Setting shift to 1 and lim to 1 rcu_task_cb_adjust=1 rcu_task_cpu_ids=2.
[ 4.089063][ T0] NR_IRQS: 4352, nr_irqs: 440, preallocated irqs: 16
[ 4.113281][ T0] rcu: srcu_init: Setting srcu_struct sizes based on contention.
[ 4.130706][ T0] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 4.167486][ T0] kfence: initialized - using 2097152 bytes for 255 objects at 0xffff88823be00000-0xffff88823c000000
[ 4.194530][ T0] Console: colour VGA+ 80x25
[ 4.205681][ T0] printk: console [ttyS0] enabled
[ 4.205681][ T0] printk: console [ttyS0] enabled
[ 4.222934][ T0] printk: legacy bootconsole [earlyser0] disabled
[ 4.222934][ T0] printk: legacy bootconsole [earlyser0] disabled
[ 4.244151][ T0] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
[ 4.257386][ T0] ... MAX_LOCKDEP_SUBCLASSES: 8
[ 4.264092][ T0] ... MAX_LOCK_DEPTH: 48
[ 4.274091][ T0] ... MAX_LOCKDEP_KEYS: 8192
[ 4.282595][ T0] ... CLASSHASH_SIZE: 4096
[ 4.290922][ T0] ... MAX_LOCKDEP_ENTRIES: 1048576
[ 4.297925][ T0] ... MAX_LOCKDEP_CHAINS: 1048576
[ 4.307054][ T0] ... CHAINHASH_SIZE: 524288
[ 4.315666][ T0] memory used by lock dependency info: 106625 kB
[ 4.324342][ T0] memory used for stack traces: 8320 kB
[ 4.331569][ T0] per task-struct memory footprint: 1920 bytes
[ 4.348074][ T0] mempolicy: Enabling automatic NUMA balancing. Configure with numa_balancing= or the kernel.numa_balancing sysctl
[ 4.372656][ T0] ACPI: Core revision 20260408
[ 4.387852][ T0] APIC: Switch to symmetric I/O mode setup
[ 4.406067][ T0] x2apic enabled
[ 4.436577][ T0] APIC: Switched APIC routing to: physical x2apic
[ 4.475900][ T0] ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1
[ 4.488117][ T0] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x1fb63109b96, max_idle_ns: 440795265316 ns
[ 4.504790][ T0] Calibrating delay loop (skipped) preset value.. 4399.99 BogoMIPS (lpj=21999980)
[ 4.516016][ T0] Last level iTLB entries: 4KB 64, 2MB 8, 4MB 8
[ 4.524792][ T0] Last level dTLB entries: 4KB 64, 2MB 32, 4MB 32, 1GB 4
[ 4.534880][ T0] mitigations: Enabled attack vectors: user_kernel, user_user, guest_host, guest_guest, SMT mitigations: auto
[ 4.544792][ T0] Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl
[ 4.554799][ T0] Spectre V2 : Mitigation: IBRS
[ 4.564795][ T0] RETBleed: Mitigation: IBRS
[ 4.574787][ T0] ITS: Mitigation: Aligned branch/return thunks
[ 4.584792][ T0] Spectre V2 : User space: Mitigation: STIBP via prctl
[ 4.593057][ T0] MDS: Mitigation: Clear CPU buffers
[ 4.594791][ T0] TAA: Mitigation: Clear CPU buffers
[ 4.604928][ T0] MMIO Stale Data: Vulnerable: Clear CPU buffers attempted, no microcode
[ 4.614791][ T0] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
[ 4.624798][ T0] Spectre V2 : Spectre v2 / SpectreRSB: Filling RSB on context switch and VMEXIT
[ 4.634823][ T0] Spectre V2 : Enabling IBPB for BPF
[ 4.644887][ T0] Spectre V2 : mitigation: Enabling conditional Indirect Branch Prediction Barrier
[ 4.654849][ T0] active return thunk: its_return_thunk
[ 4.664790][ T0] Spectre V2 : Spectre BHI mitigation: SW BHB clearing on syscall and VM exit
[ 4.674893][ T0] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
[ 4.684798][ T0] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
[ 4.694796][ T0] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
[ 4.704795][ T0] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256
[ 4.714792][ T0] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
[ 4.727670][ T0] ------------[ cut here ]------------
[ 4.734798][ T0] CPA detected W^X violation: 8000000000000023 -> 0000000000000023 range: 0xffffffffa0000000 - 0xffffffffa0000fff PFN 1b200
[ 4.744793][ T0] WARNING: arch/x86/mm/pat/set_memory.c:725 at __change_page_attr_set_clr+0x1d69/0x2820, CPU#0: swapper/0/0
[ 4.754805][ T0] Modules linked in:
[ 4.764799][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
[ 4.774797][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 4.784794][ T0] RIP: 0010:__change_page_attr_set_clr+0x1d79/0x2820
[ 4.794795][ T0] Code: 00 00 e8 8a 2e 4e 00 48 8b 4c 24 30 4c 8d 81 ff 0f 00 00 48 8d 3d 27 24 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 58 2e 4e 00 4c 89 f8 48 c1 e8 03
[ 4.805045][ T0] RSP: 0000:ffffffff8ea07820 EFLAGS: 00010293
[ 4.814798][ T0] RAX: ffffffff817aa2e6 RBX: 800000001b200023 RCX: ffffffffa0000000
[ 4.824795][ T0] RDX: 0000000000000023 RSI: 8000000000000023 RDI: ffffffff907cc720
[ 4.834792][ T0] RBP: ffffffff8ea07ad0 R08: ffffffffa0000fff R09: 000000000001b200
[ 4.844790][ T0] R10: dffffc0000000000 R11: fffffbfff1d40ef4 R12: 8000000000000000
[ 4.854792][ T0] R13: 0000000000000002 R14: 0000000000000023 R15: 8000000000000002
[ 4.864793][ T0] FS: 0000000000000000(0000) GS:ffff888124cba000(0000) knlGS:0000000000000000
[ 4.874791][ T0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4.884792][ T0] CR2: ffff88823ffff000 CR3: 000000000eb48000 CR4: 00000000003506f0
[ 4.894796][ T0] Call Trace:
[ 4.904794][ T0]
[ 4.908508][ T0] ? __pfx___mutex_unlock_slowpath+0x10/0x10
[ 4.914812][ T0] ? __purge_vmap_area_lazy+0x8ec/0xab0
[ 4.924810][ T0] ? __pfx___change_page_attr_set_clr+0x10/0x10
[ 4.934797][ T0] ? __might_resched+0x71/0x4c0
[ 4.940686][ T0] ? down_read+0x2b9/0x320
[ 4.944800][ T0] change_page_attr_set_clr+0x398/0x11d0
[ 4.954805][ T0] ? __pfx_change_page_attr_set_clr+0x10/0x10
[ 4.964911][ T0] ? trace_kmalloc+0x2a/0xf0
[ 4.971621][ T0] set_memory_x+0xd6/0x110
[ 4.974799][ T0] ? __pfx_set_memory_x+0x10/0x10
[ 4.981098][ T0] apply_retpolines+0x8e9/0x15a0
[ 4.984806][ T0] ? events_sysfs_show+0xdd/0xf0
[ 4.994793][ T0] ? __pfx_apply_retpolines+0x10/0x10
[ 5.000501][ T0] ? events_sysfs_show+0xdd/0xf0
[ 5.004799][ T0] ? events_sysfs_show+0xec/0xf0
[ 5.014805][ T0] ? events_sysfs_show+0xe3/0xf0
[ 5.021377][ T0] ? unregister_die_notifier+0x43/0x50
[ 5.024796][ T0] ? __pfx_int3_selftest+0x10/0x10
[ 5.034828][ T0] alternative_instructions+0x3a/0x100
[ 5.044804][ T0] arch_cpu_finalize_init+0xb2/0x1f0
[ 5.054819][ T0] start_kernel+0x315/0x3e0
[ 5.064808][ T0] x86_64_start_reservations+0x24/0x30
[ 5.074805][ T0] x86_64_start_kernel+0x137/0x1b0
[ 5.084811][ T0] common_startup_64+0x13e/0x157
[ 5.091636][ T0]
[ 5.094804][ T0] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 5.103963][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
[ 5.104772][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 5.104772][ T0] Call Trace:
[ 5.104772][ T0]
[ 5.104772][ T0] vpanic+0x26f/0x710
[ 5.104772][ T0] panic+0xc5/0xd0
[ 5.104772][ T0] ? __pfx_panic+0x10/0x10
[ 5.104772][ T0] ? common_startup_64+0x13e/0x157
[ 5.104772][ T0] __warn+0x315/0x4c0
[ 5.104772][ T0] ? __change_page_attr_set_clr+0x1d69/0x2820
[ 5.104772][ T0] ? __change_page_attr_set_clr+0x1d69/0x2820
[ 5.104772][ T0] __report_bug+0x276/0x570
[ 5.104772][ T0] ? __change_page_attr_set_clr+0x1d69/0x2820
[ 5.104772][ T0] ? __pfx___report_bug+0x10/0x10
[ 5.104772][ T0] report_bug_entry+0x19b/0x290
[ 5.104772][ T0] ? __change_page_attr_set_clr+0x1d79/0x2820
[ 5.104772][ T0] ? __change_page_attr_set_clr+0x1d7e/0x2820
[ 5.104772][ T0] handle_bug+0xce/0x200
[ 5.104772][ T0] exc_invalid_op+0x1a/0x50
[ 5.104772][ T0] asm_exc_invalid_op+0x1a/0x20
[ 5.104772][ T0] RIP: 0010:__change_page_attr_set_clr+0x1d79/0x2820
[ 5.104772][ T0] Code: 00 00 e8 8a 2e 4e 00 48 8b 4c 24 30 4c 8d 81 ff 0f 00 00 48 8d 3d 27 24 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 58 2e 4e 00 4c 89 f8 48 c1 e8 03
[ 5.104772][ T0] RSP: 0000:ffffffff8ea07820 EFLAGS: 00010293
[ 5.104772][ T0] RAX: ffffffff817aa2e6 RBX: 800000001b200023 RCX: ffffffffa0000000
[ 5.104772][ T0] RDX: 0000000000000023 RSI: 8000000000000023 RDI: ffffffff907cc720
[ 5.104772][ T0] RBP: ffffffff8ea07ad0 R08: ffffffffa0000fff R09: 000000000001b200
[ 5.104772][ T0] R10: dffffc0000000000 R11: fffffbfff1d40ef4 R12: 8000000000000000
[ 5.104772][ T0] R13: 0000000000000002 R14: 0000000000000023 R15: 8000000000000002
[ 5.104772][ T0] ? __change_page_attr_set_clr+0x1d56/0x2820
[ 5.104772][ T0] ? __pfx___mutex_unlock_slowpath+0x10/0x10
[ 5.104772][ T0] ? __purge_vmap_area_lazy+0x8ec/0xab0
[ 5.104772][ T0] ? __pfx___change_page_attr_set_clr+0x10/0x10
[ 5.104772][ T0] ? __might_resched+0x71/0x4c0
[ 5.104772][ T0] ? down_read+0x2b9/0x320
[ 5.104772][ T0] change_page_attr_set_clr+0x398/0x11d0
[ 5.104772][ T0] ? __pfx_change_page_attr_set_clr+0x10/0x10
[ 5.104772][ T0] ? trace_kmalloc+0x2a/0xf0
[ 5.104772][ T0] set_memory_x+0xd6/0x110
[ 5.104772][ T0] ? __pfx_set_memory_x+0x10/0x10
[ 5.104772][ T0] apply_retpolines+0x8e9/0x15a0
[ 5.104772][ T0] ? events_sysfs_show+0xdd/0xf0
[ 5.104772][ T0] ? __pfx_apply_retpolines+0x10/0x10
[ 5.104772][ T0] ? events_sysfs_show+0xdd/0xf0
[ 5.104772][ T0] ? events_sysfs_show+0xec/0xf0
[ 5.104772][ T0] ? events_sysfs_show+0xe3/0xf0
[ 5.104772][ T0] ? unregister_die_notifier+0x43/0x50
[ 5.104772][ T0] ? __pfx_int3_selftest+0x10/0x10
[ 5.104772][ T0] alternative_instructions+0x3a/0x100
[ 5.104772][ T0] arch_cpu_finalize_init+0xb2/0x1f0
[ 5.104772][ T0] start_kernel+0x315/0x3e0
[ 5.104772][ T0] x86_64_start_reservations+0x24/0x30
[ 5.104772][ T0] x86_64_start_kernel+0x137/0x1b0
[ 5.104772][ T0] common_startup_64+0x13e/0x157
[ 5.104772][ T0]
[ 5.104772][ T0] Rebooting in 86400 seconds..