Extracting prog: 1m54.14727727s
Minimizing prog: 8m44.942154337s
Simplifying prog options: 0s
Extracting C: 56.732141279s
Simplifying C: 6m8.502661169s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./mysys\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='./mysys\x00', &(0x7f0000000200)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./mysys/bus/pci/devices/0000:00:02.0/resource0\x00', 0x2, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, r0, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program crashed: Internal error in futex_cmpxchg_value_locked
single: successfully extracted reproducer
found reproducer with 5 syscalls
minimizing guilty program
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./mysys\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='./mysys\x00', &(0x7f0000000200)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./mysys/bus/pci/devices/0000:00:02.0/resource0\x00', 0x2, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, r0, 0x0)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-futex
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./mysys\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='./mysys\x00', &(0x7f0000000200)='sysfs\x00', 0x0, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000000300)='./mysys/bus/pci/devices/0000:00:02.0/resource0\x00', 0x2, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-mmap-futex
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./mysys\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='./mysys\x00', &(0x7f0000000200)='sysfs\x00', 0x0, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, 0xffffffffffffffff, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-openat-mmap-futex
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./mysys\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./mysys/bus/pci/devices/0000:00:02.0/resource0\x00', 0x2, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, r0, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mount-openat-mmap-futex
detailed listing:
executing program 0:
mount(0x0, &(0x7f0000000100)='./mysys\x00', &(0x7f0000000200)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./mysys/bus/pci/devices/0000:00:02.0/resource0\x00', 0x2, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, r0, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
mount(0x0, &(0x7f0000000100)='./mysys\x00', &(0x7f0000000200)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./mysys/bus/pci/devices/0000:00:02.0/resource0\x00', 0x2, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, r0, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./mysys\x00', 0x1ff)
mount(0x0, 0x0, &(0x7f0000000200)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./mysys/bus/pci/devices/0000:00:02.0/resource0\x00', 0x2, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, r0, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./mysys\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='./mysys\x00', 0x0, 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./mysys/bus/pci/devices/0000:00:02.0/resource0\x00', 0x2, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, r0, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./mysys\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='./mysys\x00', &(0x7f0000000200)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, 0x0, 0x2, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, r0, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program did not crash
extracting C reproducer
testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
program crashed: Internal error in futex_cmpxchg_value_locked
simplifying C reproducer
testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
program crashed: Internal error in futex_cmpxchg_value_locked
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
program crashed: Internal error in futex_cmpxchg_value_locked
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
program crashed: Internal error in futex_cmpxchg_value_locked
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
program crashed: Internal error in futex_cmpxchg_value_locked
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
program crashed: Internal error in futex_cmpxchg_value_locked
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
program crashed: Internal error in futex_cmpxchg_value_locked
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
program crashed: Internal error in futex_cmpxchg_value_locked
testing program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./mysys\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='./mysys\x00', &(0x7f0000000200)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./mysys/bus/pci/devices/0000:00:02.0/resource0\x00', 0x2, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, r0, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program crashed: Internal error in futex_cmpxchg_value_locked
validation run: crashed=true
testing program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./mysys\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='./mysys\x00', &(0x7f0000000200)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./mysys/bus/pci/devices/0000:00:02.0/resource0\x00', 0x2, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, r0, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program crashed: Internal error in futex_cmpxchg_value_locked
validation run: crashed=true
testing program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-mmap-futex
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./mysys\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='./mysys\x00', &(0x7f0000000200)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./mysys/bus/pci/devices/0000:00:02.0/resource0\x00', 0x2, 0x0)
mmap(0x0, 0x1000, 0x3, 0x11, r0, 0x0)
futex(0x0, 0x86, 0x2, 0x0, 0x0, 0xfffffffc)

program crashed: Internal error in futex_cmpxchg_value_locked
validation run: crashed=true
reproducing took 21m10.860149344s
repro crashed as (corrupted=false):
Internal error: synchronous external abort: 0000000096000010 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 4925 Comm: syz.0.17 Tainted: G   M                syzkaller #0 PREEMPT 
Tainted: [M]=MACHINE_CHECK
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
pstate: 83000005 (Nzcv daif -PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __llsc_futex_cmpxchg arch/arm64/include/asm/futex.h:64 [inline]
pc : __futex_cmpxchg arch/arm64/include/asm/futex.h:247 [inline]
pc : futex_atomic_cmpxchg_inatomic arch/arm64/include/asm/futex.h:295 [inline]
pc : futex_cmpxchg_value_locked+0x114/0x394 kernel/futex/futex.h:295
lr : access_ok arch/arm64/include/asm/uaccess.h:45 [inline]
lr : futex_atomic_cmpxchg_inatomic arch/arm64/include/asm/futex.h:290 [inline]
lr : futex_cmpxchg_value_locked+0xc8/0x394 kernel/futex/futex.h:295
sp : ffff800094f17750
x29: ffff800094f17770 x28: 1fffe00019474005 x27: ffff0000ca3a002c
x26: 1fffe000194742e5 x25: dfff800000000000 x24: 0000000000000000
x23: 0000000000000000 x22: 000000008f0101ff x21: 000000000f0101ff
x20: 000ffffffffffffd x19: ffff0000ca3a172c x18: 0000000000000000
x17: ffff800080590828 x16: ffff8000805904c4 x15: ffff8000805942dc
x14: 0000000000637b1a x13: 0000000000000009 x12: 0000000000000009
x11: 00000000eab51ce5 x10: 0000000000000080 x9 : 00000000fffffff5
x8 : 0000000000000000 x7 : ffff80008036e6f8 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800080595138
x2 : 0000000000000000 x1 : ffff0000ca3a0000 x0 : 0000000000000000
Call trace:
 __llsc_futex_cmpxchg arch/arm64/include/asm/futex.h:64 [inline] (P)
 __futex_cmpxchg arch/arm64/include/asm/futex.h:247 [inline] (P)
 futex_atomic_cmpxchg_inatomic arch/arm64/include/asm/futex.h:295 [inline] (P)
 futex_cmpxchg_value_locked+0x114/0x394 kernel/futex/futex.h:295 (P)
 lock_pi_update_atomic+0x58/0xd4 kernel/futex/pi.c:549
 futex_lock_pi_atomic+0x28c/0x898 kernel/futex/pi.c:666
 futex_lock_pi+0x248/0x6d8 kernel/futex/pi.c:1018
 do_futex+0x2f8/0x378 kernel/futex/syscalls.c:-1
 __do_sys_futex kernel/futex/syscalls.c:210 [inline]
 __se_sys_futex kernel/futex/syscalls.c:191 [inline]
 __arm64_sys_futex+0x2e4/0x418 kernel/futex/syscalls.c:191
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606
Code: 2a1f03e0 12800149 d500409f f9800111 (885f7d14) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	2a1f03e0 	mov	w0, wzr
   4:	12800149 	mov	w9, #0xfffffff5            	// #-11
   8:	d500409f 	msr	pan, #0x0
   c:	f9800111 	prfm	pstl1strm, [x8]
* 10:	885f7d14 	ldxr	w20, [x8] <-- trapping instruction

final repro crashed as (corrupted=false):
Internal error: synchronous external abort: 0000000096000010 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 4925 Comm: syz.0.17 Tainted: G   M                syzkaller #0 PREEMPT 
Tainted: [M]=MACHINE_CHECK
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
pstate: 83000005 (Nzcv daif -PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __llsc_futex_cmpxchg arch/arm64/include/asm/futex.h:64 [inline]
pc : __futex_cmpxchg arch/arm64/include/asm/futex.h:247 [inline]
pc : futex_atomic_cmpxchg_inatomic arch/arm64/include/asm/futex.h:295 [inline]
pc : futex_cmpxchg_value_locked+0x114/0x394 kernel/futex/futex.h:295
lr : access_ok arch/arm64/include/asm/uaccess.h:45 [inline]
lr : futex_atomic_cmpxchg_inatomic arch/arm64/include/asm/futex.h:290 [inline]
lr : futex_cmpxchg_value_locked+0xc8/0x394 kernel/futex/futex.h:295
sp : ffff800094f17750
x29: ffff800094f17770 x28: 1fffe00019474005 x27: ffff0000ca3a002c
x26: 1fffe000194742e5 x25: dfff800000000000 x24: 0000000000000000
x23: 0000000000000000 x22: 000000008f0101ff x21: 000000000f0101ff
x20: 000ffffffffffffd x19: ffff0000ca3a172c x18: 0000000000000000
x17: ffff800080590828 x16: ffff8000805904c4 x15: ffff8000805942dc
x14: 0000000000637b1a x13: 0000000000000009 x12: 0000000000000009
x11: 00000000eab51ce5 x10: 0000000000000080 x9 : 00000000fffffff5
x8 : 0000000000000000 x7 : ffff80008036e6f8 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800080595138
x2 : 0000000000000000 x1 : ffff0000ca3a0000 x0 : 0000000000000000
Call trace:
 __llsc_futex_cmpxchg arch/arm64/include/asm/futex.h:64 [inline] (P)
 __futex_cmpxchg arch/arm64/include/asm/futex.h:247 [inline] (P)
 futex_atomic_cmpxchg_inatomic arch/arm64/include/asm/futex.h:295 [inline] (P)
 futex_cmpxchg_value_locked+0x114/0x394 kernel/futex/futex.h:295 (P)
 lock_pi_update_atomic+0x58/0xd4 kernel/futex/pi.c:549
 futex_lock_pi_atomic+0x28c/0x898 kernel/futex/pi.c:666
 futex_lock_pi+0x248/0x6d8 kernel/futex/pi.c:1018
 do_futex+0x2f8/0x378 kernel/futex/syscalls.c:-1
 __do_sys_futex kernel/futex/syscalls.c:210 [inline]
 __se_sys_futex kernel/futex/syscalls.c:191 [inline]
 __arm64_sys_futex+0x2e4/0x418 kernel/futex/syscalls.c:191
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606
Code: 2a1f03e0 12800149 d500409f f9800111 (885f7d14) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	2a1f03e0 	mov	w0, wzr
   4:	12800149 	mov	w9, #0xfffffff5            	// #-11
   8:	d500409f 	msr	pan, #0x0
   c:	f9800111 	prfm	pstl1strm, [x8]
* 10:	885f7d14 	ldxr	w20, [x8] <-- trapping instruction