Extracting prog: 2m11.253091129s Minimizing prog: 13m24.094700363s Simplifying prog options: 0s Extracting C: 1m25.598529744s Simplifying C: 11m26.059021432s extracting reproducer from 70 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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY detailed listing: executing program 0: mmap(&(0x7f0000000000/0xe7e000)=nil, 0xe7e000, 0xfffffffffffffffe, 0x4031, 0xffffffffffffffff, 0x0) r0 = userfaultfd(0x80001) ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f0000000000)={0xaa, 0x1c}) ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000140)={{&(0x7f00000e2000/0xc00000)=nil, 0xc00000}, 0x4}) ioctl$UFFDIO_COPY(r0, 0xc028aa03, &(0x7f0000000080)={&(0x7f00009e5000/0x1000)=nil, &(0x7f0000839000/0x4000)=nil, 0x1000, 0x3, 0x6040000}) program crashed: possible deadlock in mfill_get_vma single: successfully extracted reproducer found reproducer with 5 syscalls minimizing guilty program testing program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER detailed listing: executing program 0: mmap(&(0x7f0000000000/0xe7e000)=nil, 0xe7e000, 0xfffffffffffffffe, 0x4031, 0xffffffffffffffff, 0x0) r0 = userfaultfd(0x80001) ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f0000000000)={0xaa, 0x1c}) ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000140)={{&(0x7f00000e2000/0xc00000)=nil, 0xc00000}, 0x4}) program did not crash testing program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_COPY detailed listing: executing program 0: mmap(&(0x7f0000000000/0xe7e000)=nil, 0xe7e000, 0xfffffffffffffffe, 0x4031, 0xffffffffffffffff, 0x0) r0 = userfaultfd(0x80001) ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f0000000000)={0xaa, 0x1c}) ioctl$UFFDIO_COPY(r0, 0xc028aa03, &(0x7f0000000080)={&(0x7f00009e5000/0x1000)=nil, &(0x7f0000839000/0x4000)=nil, 0x1000, 0x3, 0x6040000}) program did not crash testing program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY detailed listing: executing program 0: mmap(&(0x7f0000000000/0xe7e000)=nil, 0xe7e000, 0xfffffffffffffffe, 0x4031, 0xffffffffffffffff, 0x0) r0 = userfaultfd(0x80001) ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000140)={{&(0x7f00000e2000/0xc00000)=nil, 0xc00000}, 0x4}) ioctl$UFFDIO_COPY(r0, 0xc028aa03, &(0x7f0000000080)={&(0x7f00009e5000/0x1000)=nil, &(0x7f0000839000/0x4000)=nil, 0x1000, 0x3, 0x6040000}) program crashed: lost connection to test machine suppressed program crash: lost connection to test machine testing program (duration=45.398044671s, {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}}): mmap-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY detailed listing: executing program 0: mmap(&(0x7f0000000000/0xe7e000)=nil, 0xe7e000, 0xfffffffffffffffe, 0x4031, 0xffffffffffffffff, 0x0) ioctl$UFFDIO_API(0xffffffffffffffff, 0xc018aa3f, &(0x7f0000000000)={0xaa, 0x1c}) ioctl$UFFDIO_REGISTER(0xffffffffffffffff, 0xc020aa00, &(0x7f0000000140)={{&(0x7f00000e2000/0xc00000)=nil, 0xc00000}, 0x4}) ioctl$UFFDIO_COPY(0xffffffffffffffff, 0xc028aa03, &(0x7f0000000080)={&(0x7f00009e5000/0x1000)=nil, &(0x7f0000839000/0x4000)=nil, 0x1000, 0x3, 0x6040000}) program did not crash testing program (duration=45.398044671s, {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}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY detailed listing: executing program 0: r0 = userfaultfd(0x80001) ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f0000000000)={0xaa, 0x1c}) ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000140)={{&(0x7f00000e2000/0xc00000)=nil, 0xc00000}, 0x4}) ioctl$UFFDIO_COPY(r0, 0xc028aa03, &(0x7f0000000080)={&(0x7f00009e5000/0x1000)=nil, &(0x7f0000839000/0x4000)=nil, 0x1000, 0x3, 0x6040000}) program did not crash testing program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY detailed listing: executing program 0: mmap(&(0x7f0000000000/0xe7e000)=nil, 0xe7e000, 0xfffffffffffffffe, 0x4031, 0xffffffffffffffff, 0x0) r0 = userfaultfd(0x80001) ioctl$UFFDIO_API(r0, 0xc018aa3f, 0x0) ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000140)={{&(0x7f00000e2000/0xc00000)=nil, 0xc00000}, 0x4}) ioctl$UFFDIO_COPY(r0, 0xc028aa03, &(0x7f0000000080)={&(0x7f00009e5000/0x1000)=nil, &(0x7f0000839000/0x4000)=nil, 0x1000, 0x3, 0x6040000}) program did not crash testing program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY detailed listing: executing program 0: mmap(&(0x7f0000000000/0xe7e000)=nil, 0xe7e000, 0xfffffffffffffffe, 0x4031, 0xffffffffffffffff, 0x0) r0 = userfaultfd(0x80001) ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f0000000000)={0xaa, 0x1c}) ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, 0x0) ioctl$UFFDIO_COPY(r0, 0xc028aa03, &(0x7f0000000080)={&(0x7f00009e5000/0x1000)=nil, &(0x7f0000839000/0x4000)=nil, 0x1000, 0x3, 0x6040000}) program did not crash testing program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY detailed listing: executing program 0: mmap(&(0x7f0000000000/0xe7e000)=nil, 0xe7e000, 0xfffffffffffffffe, 0x4031, 0xffffffffffffffff, 0x0) r0 = userfaultfd(0x80001) ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f0000000000)={0xaa, 0x1c}) ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000140)={{&(0x7f00000e2000/0xc00000)=nil, 0xc00000}, 0x4}) ioctl$UFFDIO_COPY(r0, 0xc028aa03, 0x0) program did not crash extracting C reproducer testing compiled C program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY program crashed: possible deadlock in mfill_get_vma simplifying C reproducer testing compiled C program (duration=45.398044671s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY program crashed: possible deadlock in mfill_get_vma testing compiled C program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY program crashed: possible deadlock in mfill_get_vma testing compiled C program (duration=45.398044671s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY program crashed: possible deadlock in mfill_get_vma testing compiled C program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY program crashed: possible deadlock in mfill_get_vma testing compiled C program (duration=45.398044671s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY program crashed: possible deadlock in mfill_get_vma testing compiled C program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY program crashed: possible deadlock in mfill_get_vma testing compiled C program (duration=45.398044671s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY program crashed: possible deadlock in mfill_get_vma testing program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY detailed listing: executing program 0: mmap(&(0x7f0000000000/0xe7e000)=nil, 0xe7e000, 0xfffffffffffffffe, 0x4031, 0xffffffffffffffff, 0x0) r0 = userfaultfd(0x80001) ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f0000000000)={0xaa, 0x1c}) ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000140)={{&(0x7f00000e2000/0xc00000)=nil, 0xc00000}, 0x4}) ioctl$UFFDIO_COPY(r0, 0xc028aa03, &(0x7f0000000080)={&(0x7f00009e5000/0x1000)=nil, &(0x7f0000839000/0x4000)=nil, 0x1000, 0x3, 0x6040000}) program crashed: possible deadlock in mfill_get_vma validation run: crashed=true testing program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY detailed listing: executing program 0: mmap(&(0x7f0000000000/0xe7e000)=nil, 0xe7e000, 0xfffffffffffffffe, 0x4031, 0xffffffffffffffff, 0x0) r0 = userfaultfd(0x80001) ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f0000000000)={0xaa, 0x1c}) ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000140)={{&(0x7f00000e2000/0xc00000)=nil, 0xc00000}, 0x4}) ioctl$UFFDIO_COPY(r0, 0xc028aa03, &(0x7f0000000080)={&(0x7f00009e5000/0x1000)=nil, &(0x7f0000839000/0x4000)=nil, 0x1000, 0x3, 0x6040000}) program crashed: possible deadlock in mfill_get_vma validation run: crashed=true testing program (duration=45.398044671s, {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}}): mmap-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-ioctl$UFFDIO_COPY detailed listing: executing program 0: mmap(&(0x7f0000000000/0xe7e000)=nil, 0xe7e000, 0xfffffffffffffffe, 0x4031, 0xffffffffffffffff, 0x0) r0 = userfaultfd(0x80001) ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f0000000000)={0xaa, 0x1c}) ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000140)={{&(0x7f00000e2000/0xc00000)=nil, 0xc00000}, 0x4}) ioctl$UFFDIO_COPY(r0, 0xc028aa03, &(0x7f0000000080)={&(0x7f00009e5000/0x1000)=nil, &(0x7f0000839000/0x4000)=nil, 0x1000, 0x3, 0x6040000}) program crashed: possible deadlock in mfill_get_vma validation run: crashed=true reproducing took 34m32.328859395s repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.17/6067 is trying to acquire lock: ffff888036701000 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault+0xaf/0x130 mm/memory.c:7249 but task is already holding lock: ffff88802c65ccf8 (&ctx->map_changing_lock){.+.+}-{4:4}, at: mfill_get_vma+0x162/0x660 mm/userfaultfd.c:226 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ctx->map_changing_lock){.+.+}-{4:4}: down_read+0x47/0x2e0 kernel/locking/rwsem.c:1537 mfill_get_vma+0x162/0x660 mm/userfaultfd.c:226 mfill_atomic mm/userfaultfd.c:900 [inline] mfill_atomic_copy+0x1c5/0x1330 mm/userfaultfd.c:950 userfaultfd_copy fs/userfaultfd.c:1642 [inline] userfaultfd_ioctl+0x2b8a/0x4b00 fs/userfaultfd.c:2059 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (vm_lock){++++}-{0:0}: __vma_start_exclude_readers+0x28a/0x940 mm/mmap_lock.c:125 __vma_start_write+0xdc/0x290 mm/mmap_lock.c:148 vma_start_write include/linux/mmap_lock.h:303 [inline] mprotect_fixup+0x5ee/0xa80 mm/mprotect.c:768 setup_arg_pages+0x565/0xac0 fs/exec.c:670 load_elf_binary+0xc5e/0x2980 fs/binfmt_elf.c:1029 search_binary_handler fs/exec.c:1664 [inline] exec_binprm fs/exec.c:1696 [inline] bprm_execve+0x949/0x1470 fs/exec.c:1748 kernel_execve+0x844/0x930 fs/exec.c:1892 try_to_run_init_process+0x13/0x60 init/main.c:1512 kernel_init+0xad/0x1d0 init/main.c:1640 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #0 (&mm->mmap_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 __might_fault+0xcb/0x130 mm/memory.c:7249 userfaultfd_copy fs/userfaultfd.c:1648 [inline] userfaultfd_ioctl+0x2bcd/0x4b00 fs/userfaultfd.c:2059 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &mm->mmap_lock --> vm_lock --> &ctx->map_changing_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&ctx->map_changing_lock); lock(vm_lock); lock(&ctx->map_changing_lock); rlock(&mm->mmap_lock); *** DEADLOCK *** 2 locks held by syz.0.17/6067: #0: ffff88802b844948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310 #1: ffff88802c65ccf8 (&ctx->map_changing_lock){.+.+}-{4:4}, at: mfill_get_vma+0x162/0x660 mm/userfaultfd.c:226 stack backtrace: CPU: 0 UID: 0 PID: 6067 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 __might_fault+0xcb/0x130 mm/memory.c:7249 userfaultfd_copy fs/userfaultfd.c:1648 [inline] userfaultfd_ioctl+0x2bcd/0x4b00 fs/userfaultfd.c:2059 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9d6259c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeea0f7338 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9d62815fa0 RCX: 00007f9d6259c799 RDX: 0000200000000080 RSI: 00000000c028aa03 RDI: 0000000000000003 RBP: 00007f9d62632c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9d62815fac R14: 00007f9d62815fa0 R15: 00007f9d62815fa0 final repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.17/6067 is trying to acquire lock: ffff888036701000 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault+0xaf/0x130 mm/memory.c:7249 but task is already holding lock: ffff88802c65ccf8 (&ctx->map_changing_lock){.+.+}-{4:4}, at: mfill_get_vma+0x162/0x660 mm/userfaultfd.c:226 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ctx->map_changing_lock){.+.+}-{4:4}: down_read+0x47/0x2e0 kernel/locking/rwsem.c:1537 mfill_get_vma+0x162/0x660 mm/userfaultfd.c:226 mfill_atomic mm/userfaultfd.c:900 [inline] mfill_atomic_copy+0x1c5/0x1330 mm/userfaultfd.c:950 userfaultfd_copy fs/userfaultfd.c:1642 [inline] userfaultfd_ioctl+0x2b8a/0x4b00 fs/userfaultfd.c:2059 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (vm_lock){++++}-{0:0}: __vma_start_exclude_readers+0x28a/0x940 mm/mmap_lock.c:125 __vma_start_write+0xdc/0x290 mm/mmap_lock.c:148 vma_start_write include/linux/mmap_lock.h:303 [inline] mprotect_fixup+0x5ee/0xa80 mm/mprotect.c:768 setup_arg_pages+0x565/0xac0 fs/exec.c:670 load_elf_binary+0xc5e/0x2980 fs/binfmt_elf.c:1029 search_binary_handler fs/exec.c:1664 [inline] exec_binprm fs/exec.c:1696 [inline] bprm_execve+0x949/0x1470 fs/exec.c:1748 kernel_execve+0x844/0x930 fs/exec.c:1892 try_to_run_init_process+0x13/0x60 init/main.c:1512 kernel_init+0xad/0x1d0 init/main.c:1640 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #0 (&mm->mmap_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 __might_fault+0xcb/0x130 mm/memory.c:7249 userfaultfd_copy fs/userfaultfd.c:1648 [inline] userfaultfd_ioctl+0x2bcd/0x4b00 fs/userfaultfd.c:2059 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &mm->mmap_lock --> vm_lock --> &ctx->map_changing_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&ctx->map_changing_lock); lock(vm_lock); lock(&ctx->map_changing_lock); rlock(&mm->mmap_lock); *** DEADLOCK *** 2 locks held by syz.0.17/6067: #0: ffff88802b844948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310 #1: ffff88802c65ccf8 (&ctx->map_changing_lock){.+.+}-{4:4}, at: mfill_get_vma+0x162/0x660 mm/userfaultfd.c:226 stack backtrace: CPU: 0 UID: 0 PID: 6067 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 __might_fault+0xcb/0x130 mm/memory.c:7249 userfaultfd_copy fs/userfaultfd.c:1648 [inline] userfaultfd_ioctl+0x2bcd/0x4b00 fs/userfaultfd.c:2059 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9d6259c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeea0f7338 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9d62815fa0 RCX: 00007f9d6259c799 RDX: 0000200000000080 RSI: 00000000c028aa03 RDI: 0000000000000003 RBP: 00007f9d62632c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9d62815fac R14: 00007f9d62815fa0 R15: 00007f9d62815fa0