Extracting prog: 1m42.822716021s
Minimizing prog: 11m39.160268832s
Simplifying prog options: 0s
Extracting C: 1m1.728543285s
Simplifying C: 24m21.495014963s


extracting reproducer from 67 programs
first checking the prog from the crash report
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
detailed listing:
executing program 0:
r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)
r2 = ioctl$KVM_CREATE_GUEST_MEMFD(r1, 0xc040aed4, &(0x7f00000001c0)={0x200001fe0000})
ioctl$KVM_SET_USER_MEMORY_REGION2(r1, 0x40a0ae49, &(0x7f0000000180)={0x4, 0x4, 0x6000, 0x2000, &(0x7f0000ffc000/0x2000)=nil, 0x0, r2}) (fail_nth: 6)

program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
single: successfully extracted reproducer
found reproducer with 4 syscalls
minimizing guilty program
testing program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD
detailed listing:
executing program 0:
r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)
ioctl$KVM_CREATE_GUEST_MEMFD(r1, 0xc040aed4, &(0x7f00000001c0)={0x200001fe0000})

program did not crash
testing program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_SET_USER_MEMORY_REGION2
detailed listing:
executing program 0:
r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)
ioctl$KVM_SET_USER_MEMORY_REGION2(r1, 0x40a0ae49, &(0x7f0000000180)={0x4, 0x4, 0x6000, 0x2000, &(0x7f0000ffc000/0x2000)=nil}) (fail_nth: 6)

program did not crash
testing program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$kvm-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
r0 = ioctl$KVM_CREATE_GUEST_MEMFD(0xffffffffffffffff, 0xc040aed4, &(0x7f00000001c0)={0x200001fe0000})
ioctl$KVM_SET_USER_MEMORY_REGION2(0xffffffffffffffff, 0x40a0ae49, &(0x7f0000000180)={0x4, 0x4, 0x6000, 0x2000, &(0x7f0000ffc000/0x2000)=nil, 0x0, r0}) (fail_nth: 6)

program did not crash
testing program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
detailed listing:
executing program 0:
r0 = ioctl$KVM_CREATE_VM(0xffffffffffffffff, 0xae01, 0x0)
r1 = ioctl$KVM_CREATE_GUEST_MEMFD(r0, 0xc040aed4, &(0x7f00000001c0)={0x200001fe0000})
ioctl$KVM_SET_USER_MEMORY_REGION2(r0, 0x40a0ae49, &(0x7f0000000180)={0x4, 0x4, 0x6000, 0x2000, &(0x7f0000ffc000/0x2000)=nil, 0x0, r1}) (fail_nth: 6)

program did not crash
testing program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
detailed listing:
executing program 0:
r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)
r2 = ioctl$KVM_CREATE_GUEST_MEMFD(r1, 0xc040aed4, &(0x7f00000001c0)={0x200001fe0000})
ioctl$KVM_SET_USER_MEMORY_REGION2(r1, 0x40a0ae49, &(0x7f0000000180)={0x4, 0x4, 0x6000, 0x2000, &(0x7f0000ffc000/0x2000)=nil, 0x0, r2})

program did not crash
testing program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
detailed listing:
executing program 0:
r0 = openat$kvm(0xffffffffffffff9c, 0x0, 0x0, 0x0)
r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)
r2 = ioctl$KVM_CREATE_GUEST_MEMFD(r1, 0xc040aed4, &(0x7f00000001c0)={0x200001fe0000})
ioctl$KVM_SET_USER_MEMORY_REGION2(r1, 0x40a0ae49, &(0x7f0000000180)={0x4, 0x4, 0x6000, 0x2000, &(0x7f0000ffc000/0x2000)=nil, 0x0, r2}) (fail_nth: 6)

program did not crash
testing program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
detailed listing:
executing program 0:
r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)
r2 = ioctl$KVM_CREATE_GUEST_MEMFD(r1, 0xc040aed4, 0x0)
ioctl$KVM_SET_USER_MEMORY_REGION2(r1, 0x40a0ae49, &(0x7f0000000180)={0x4, 0x4, 0x6000, 0x2000, &(0x7f0000ffc000/0x2000)=nil, 0x0, r2}) (fail_nth: 6)

program did not crash
testing program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
detailed listing:
executing program 0:
r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)
ioctl$KVM_CREATE_GUEST_MEMFD(r1, 0xc040aed4, &(0x7f00000001c0)={0x200001fe0000})
ioctl$KVM_SET_USER_MEMORY_REGION2(r1, 0x40a0ae49, 0x0) (fail_nth: 6)

program did not crash
extracting C reproducer
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
simplifying C reproducer
testing compiled C program (duration=47.077835104s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program did not crash
testing compiled C program (duration=47.077835104s, {Threaded:true 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program did not crash
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program did not crash
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:true UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program did not crash
testing compiled C program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
testing program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
detailed listing:
executing program 0:
r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)
r2 = ioctl$KVM_CREATE_GUEST_MEMFD(r1, 0xc040aed4, &(0x7f00000001c0)={0x200001fe0000})
ioctl$KVM_SET_USER_MEMORY_REGION2(r1, 0x40a0ae49, &(0x7f0000000180)={0x4, 0x4, 0x6000, 0x2000, &(0x7f0000ffc000/0x2000)=nil, 0x0, r2}) (fail_nth: 6)

program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
validation run: crashed=true
testing program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
detailed listing:
executing program 0:
r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)
r2 = ioctl$KVM_CREATE_GUEST_MEMFD(r1, 0xc040aed4, &(0x7f00000001c0)={0x200001fe0000})
ioctl$KVM_SET_USER_MEMORY_REGION2(r1, 0x40a0ae49, &(0x7f0000000180)={0x4, 0x4, 0x6000, 0x2000, &(0x7f0000ffc000/0x2000)=nil, 0x0, r2}) (fail_nth: 6)

program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
validation run: crashed=true
testing program (duration=47.077835104s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true 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}}): openat$kvm-ioctl$KVM_CREATE_VM-ioctl$KVM_CREATE_GUEST_MEMFD-ioctl$KVM_SET_USER_MEMORY_REGION2
detailed listing:
executing program 0:
r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)
r2 = ioctl$KVM_CREATE_GUEST_MEMFD(r1, 0xc040aed4, &(0x7f00000001c0)={0x200001fe0000})
ioctl$KVM_SET_USER_MEMORY_REGION2(r1, 0x40a0ae49, &(0x7f0000000180)={0x4, 0x4, 0x6000, 0x2000, &(0x7f0000ffc000/0x2000)=nil, 0x0, r2}) (fail_nth: 6)

program crashed: KASAN: slab-use-after-free Write in kvm_gmem_release
validation run: crashed=true
reproducing took 43m3.610063095s
repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: slab-use-after-free in kvm_gmem_release+0x176/0x440 virt/kvm/guest_memfd.c:353
Write of size 8 at addr ffff888076c3a908 by task syz.0.17/5987

CPU: 1 UID: 0 PID: 5987 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 kvm_gmem_release+0x176/0x440 virt/kvm/guest_memfd.c:353
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe89eb8efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc05374288 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fe89ede7da0 RCX: 00007fe89eb8efc9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fe89ede7da0 R08: 0000000000000000 R09: 000000040537457f
R10: 00007fe89ede7cb0 R11: 0000000000000246 R12: 000000000001915f
R13: 00007ffc05374380 R14: ffffffffffffffff R15: 00007ffc053743a0
 </TASK>

Allocated by task 5988:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __kmalloc_cache_noprof+0x3e2/0x700 mm/slub.c:5758
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 kvm_set_memory_region+0x747/0xb90 virt/kvm/kvm_main.c:2104
 kvm_vm_ioctl_set_memory_region+0x6f/0xd0 virt/kvm/kvm_main.c:2154
 kvm_vm_ioctl+0x957/0xc60 virt/kvm/kvm_main.c:5201
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5988:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2533 [inline]
 slab_free mm/slub.c:6622 [inline]
 kfree+0x19a/0x6d0 mm/slub.c:6829
 kvm_set_memory_region+0x9c4/0xb90 virt/kvm/kvm_main.c:2130
 kvm_vm_ioctl_set_memory_region+0x6f/0xd0 virt/kvm/kvm_main.c:2154
 kvm_vm_ioctl+0x957/0xc60 virt/kvm/kvm_main.c:5201
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888076c3a800
 which belongs to the cache kmalloc-cg-512 of size 512
The buggy address is located 264 bytes inside of
 freed 512-byte region [ffff888076c3a800, ffff888076c3aa00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76c38
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888078e60a01
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813fe30140 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000100010 00000000f5000000 ffff888078e60a01
head: 00fff00000000040 ffff88813fe30140 dead000000000122 0000000000000000
head: 0000000000000000 0000000000100010 00000000f5000000 ffff888078e60a01
head: 00fff00000000002 ffffea0001db0e01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 50, tgid 50 (kworker/u8:3), ts 101888316348, free_ts 97186106390
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3920
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5214
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2418
 alloc_slab_page mm/slub.c:3049 [inline]
 allocate_slab+0x96/0x3a0 mm/slub.c:3222
 new_slab mm/slub.c:3276 [inline]
 ___slab_alloc+0xe94/0x18a0 mm/slub.c:4646
 __slab_alloc+0x65/0x100 mm/slub.c:4765
 __slab_alloc_node mm/slub.c:4841 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 __kmalloc_cache_noprof+0x41e/0x700 mm/slub.c:5753
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 ipv6_add_addr+0x530/0x1090 net/ipv6/addrconf.c:1120
 addrconf_add_linklocal+0x28c/0x6c0 net/ipv6/addrconf.c:3311
 addrconf_addr_gen+0x490/0x580 net/ipv6/addrconf.c:3442
 addrconf_init_auto_addrs+0x62d/0xa30 net/ipv6/addrconf.c:-1
 addrconf_notify+0xacc/0x1010 net/ipv6/addrconf.c:3740
 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
 netif_state_change+0x284/0x3a0 net/core/dev.c:1583
 linkwatch_do_dev+0x124/0x180 net/core/link_watch.c:186
page last free pid 5928 tgid 5928 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2948
 vfree+0x25a/0x400 mm/vmalloc.c:3467
 kcov_put kernel/kcov.c:439 [inline]
 kcov_close+0x28/0x50 kernel/kcov.c:535
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x2300 kernel/exit.c:966
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888076c3a800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888076c3a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888076c3a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff888076c3a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888076c3aa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

final repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: slab-use-after-free in kvm_gmem_release+0x176/0x440 virt/kvm/guest_memfd.c:353
Write of size 8 at addr ffff888076c3a908 by task syz.0.17/5987

CPU: 1 UID: 0 PID: 5987 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 kvm_gmem_release+0x176/0x440 virt/kvm/guest_memfd.c:353
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe89eb8efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc05374288 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fe89ede7da0 RCX: 00007fe89eb8efc9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fe89ede7da0 R08: 0000000000000000 R09: 000000040537457f
R10: 00007fe89ede7cb0 R11: 0000000000000246 R12: 000000000001915f
R13: 00007ffc05374380 R14: ffffffffffffffff R15: 00007ffc053743a0
 </TASK>

Allocated by task 5988:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __kmalloc_cache_noprof+0x3e2/0x700 mm/slub.c:5758
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 kvm_set_memory_region+0x747/0xb90 virt/kvm/kvm_main.c:2104
 kvm_vm_ioctl_set_memory_region+0x6f/0xd0 virt/kvm/kvm_main.c:2154
 kvm_vm_ioctl+0x957/0xc60 virt/kvm/kvm_main.c:5201
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5988:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2533 [inline]
 slab_free mm/slub.c:6622 [inline]
 kfree+0x19a/0x6d0 mm/slub.c:6829
 kvm_set_memory_region+0x9c4/0xb90 virt/kvm/kvm_main.c:2130
 kvm_vm_ioctl_set_memory_region+0x6f/0xd0 virt/kvm/kvm_main.c:2154
 kvm_vm_ioctl+0x957/0xc60 virt/kvm/kvm_main.c:5201
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888076c3a800
 which belongs to the cache kmalloc-cg-512 of size 512
The buggy address is located 264 bytes inside of
 freed 512-byte region [ffff888076c3a800, ffff888076c3aa00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76c38
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888078e60a01
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813fe30140 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000100010 00000000f5000000 ffff888078e60a01
head: 00fff00000000040 ffff88813fe30140 dead000000000122 0000000000000000
head: 0000000000000000 0000000000100010 00000000f5000000 ffff888078e60a01
head: 00fff00000000002 ffffea0001db0e01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 50, tgid 50 (kworker/u8:3), ts 101888316348, free_ts 97186106390
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3920
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5214
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2418
 alloc_slab_page mm/slub.c:3049 [inline]
 allocate_slab+0x96/0x3a0 mm/slub.c:3222
 new_slab mm/slub.c:3276 [inline]
 ___slab_alloc+0xe94/0x18a0 mm/slub.c:4646
 __slab_alloc+0x65/0x100 mm/slub.c:4765
 __slab_alloc_node mm/slub.c:4841 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 __kmalloc_cache_noprof+0x41e/0x700 mm/slub.c:5753
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 ipv6_add_addr+0x530/0x1090 net/ipv6/addrconf.c:1120
 addrconf_add_linklocal+0x28c/0x6c0 net/ipv6/addrconf.c:3311
 addrconf_addr_gen+0x490/0x580 net/ipv6/addrconf.c:3442
 addrconf_init_auto_addrs+0x62d/0xa30 net/ipv6/addrconf.c:-1
 addrconf_notify+0xacc/0x1010 net/ipv6/addrconf.c:3740
 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
 netif_state_change+0x284/0x3a0 net/core/dev.c:1583
 linkwatch_do_dev+0x124/0x180 net/core/link_watch.c:186
page last free pid 5928 tgid 5928 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2948
 vfree+0x25a/0x400 mm/vmalloc.c:3467
 kcov_put kernel/kcov.c:439 [inline]
 kcov_close+0x28/0x50 kernel/kcov.c:535
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x2300 kernel/exit.c:966
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888076c3a800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888076c3a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888076c3a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff888076c3a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888076c3aa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================