Extracting prog: 1m13.969084883s
Minimizing prog: 9m27.593034159s
Simplifying prog options: 0s
Extracting C: 23.75030448s
Simplifying C: 3m33.363027321s


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: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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

program crashed: KASAN: use-after-free Read in device_create
single: successfully extracted reproducer
found reproducer with 6 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: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}}): mkdir-mount-mkdir-rmdir-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)

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: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}}): mkdir-mount-mkdir-rmdir-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

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: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}}): mkdir-mount-mkdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

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: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}}): mkdir-mount-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

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: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}}): mkdir-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

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: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}}): mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

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: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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(0x0, 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

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: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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, 0x0, &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

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: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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', 0x0, 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

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: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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(0x0, 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

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: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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(0x0)
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

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: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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

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: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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)

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: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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
program crashed: KASAN: use-after-free Read in device_create
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: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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
program crashed: KASAN: use-after-free Read in device_create
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: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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
program crashed: KASAN: use-after-free Read in device_create
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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
program crashed: KASAN: use-after-free Read in device_create
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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
program crashed: KASAN: use-after-free Read in device_create
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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
program crashed: KASAN: use-after-free Read in device_create
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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
program crashed: KASAN: use-after-free Read in device_create
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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

program crashed: KASAN: use-after-free Read in device_create
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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

program crashed: KASAN: use-after-free Read in device_create
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}}): mkdir-mount-mkdir-rmdir-mkdirat-mkdirat
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000300)='./config\x00', &(0x7f0000000400)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000500)='./config/usb_gadget/g2\x00', 0x1ff)
rmdir(&(0x7f0000000600)='./config/usb_gadget/g2\x00')
mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/usb_gadget/g1/functions/midi.usb0\x00', 0x1ff)

program crashed: KASAN: use-after-free Read in device_create
validation run: crashed=true
reproducing took 16m28.907029022s
repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: use-after-free in kobject_get+0x113/0x120 lib/kobject.c:631
Read of size 1 at addr ffff888115b4d83c by task syz.2.17/375

CPU: 1 PID: 375 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:348
 kobject_get+0x113/0x120 lib/kobject.c:631
 get_device drivers/base/core.c:3794 [inline]
 device_add+0x2f0/0xec0 drivers/base/core.c:3618
 device_create_groups_vargs drivers/base/core.c:4392 [inline]
 device_create+0x26c/0x300 drivers/base/core.c:4434
 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:36
 create_alsa_device drivers/usb/gadget/function/f_midi.c:1306 [inline]
 f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1347
 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline]
 usb_get_function_instance+0xf3/0x310 drivers/usb/gadget/functions.c:44
 function_make+0x118/0x360 drivers/usb/gadget/configfs.c:652
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdirat fs/namei.c:4153 [inline]
 __se_sys_mkdirat fs/namei.c:4151 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4151
 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efc3279e159
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:00007ffcd1c73f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007efc32a25fa0 RCX: 00007efc3279e159
RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007efc3283506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc32a25fac R14: 00007efc32a25fa0 R15: 00007efc32a25fa0
 </TASK>

Allocated by task 375:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 kmalloc_trace+0x40/0xb0 mm/slab_common.c:1033
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 device_create_groups_vargs drivers/base/core.c:4374 [inline]
 device_create+0x13a/0x300 drivers/base/core.c:4434
 android_device_create drivers/usb/gadget/configfs.c:1784 [inline]
 gadgets_make+0x84a/0xad0 drivers/usb/gadget/configfs.c:1886
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdir fs/namei.c:4158 [inline]
 __se_sys_mkdir fs/namei.c:4156 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4156
 x64_sys_call+0x966/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:84
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 375:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1750 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
 slab_free mm/slub.c:3712 [inline]
 __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
 kfree+0x6f/0xf0 mm/slab_common.c:990
 device_create_release+0x15/0x20 drivers/base/core.c:4359
 device_release+0xa4/0x1d0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:681 [inline]
 kobject_release lib/kobject.c:712 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x19d/0x280 lib/kobject.c:729
 put_device drivers/base/core.c:3806 [inline]
 device_unregister drivers/base/core.c:3930 [inline]
 device_destroy+0xb4/0xf0 drivers/base/core.c:4500
 android_device_destroy drivers/usb/gadget/configfs.c:1816 [inline]
 gadgets_drop+0xa0/0xd0 drivers/usb/gadget/configfs.c:1904
 client_drop_item fs/configfs/dir.c:933 [inline]
 configfs_rmdir+0x89b/0x980 fs/configfs/dir.c:1536
 vfs_rmdir+0x381/0x4f0 fs/namei.c:4198
 do_rmdir+0x261/0x6b0 fs/namei.c:4259
 __do_sys_rmdir fs/namei.c:4278 [inline]
 __se_sys_rmdir fs/namei.c:4276 [inline]
 __x64_sys_rmdir+0x49/0x50 fs/namei.c:4276
 x64_sys_call+0x68e/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:85
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888115b4d800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 60 bytes inside of
 1024-byte region [ffff888115b4d800, ffff888115b4dc00)

The buggy address belongs to the physical page:
page:ffffea000456d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115b48
head:ffffea000456d200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea0004563000 dead000000000002 ffff888100043080
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 113, tgid 113 (udevd), ts 6618575377, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node_track_caller+0xa1/0x1e0 mm/slab_common.c:958
 kmalloc_reserve net/core/skbuff.c:449 [inline]
 __alloc_skb+0x226/0x4a0 net/core/skbuff.c:518
 alloc_skb include/linux/skbuff.h:1322 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1183 [inline]
 netlink_sendmsg+0x635/0xbd0 net/netlink/af_netlink.c:1853
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 ____sys_sendmsg+0x5fb/0x9c0 net/socket.c:2509
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2563
 __sys_sendmsg net/socket.c:2592 [inline]
 __do_sys_sendmsg net/socket.c:2601 [inline]
 __se_sys_sendmsg net/socket.c:2599 [inline]
 __x64_sys_sendmsg+0x20d/0x2e0 net/socket.c:2599
 x64_sys_call+0x171/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888115b4d700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888115b4d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888115b4d800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff888115b4d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888115b4d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 375 at lib/refcount.c:25 refcount_warn_saturate+0x104/0x1a0 lib/refcount.c:25
Modules linked in:
CPU: 1 PID: 375 Comm: syz.2.17 Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:refcount_warn_saturate+0x104/0x1a0 lib/refcount.c:25
Code: 05 01 48 c7 c7 00 15 ca 85 e8 b8 c8 d8 fe 0f 0b eb df e8 ef 42 08 ff c6 05 ff 81 26 05 01 48 c7 c7 40 14 ca 85 e8 9c c8 d8 fe <0f> 0b eb c3 e8 d3 42 08 ff c6 05 e4 81 26 05 01 48 c7 c7 a0 14 ca
RSP: 0018:ffffc900016f7a18 EFLAGS: 00010246
RAX: d3b30f91c800fc00 RBX: 0000000000000002 RCX: ffff88811460e540
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc900016f7a28 R08: ffffc900016f7607 R09: 1ffff920002deec0
R10: dffffc0000000000 R11: fffff520002deec1 R12: 1ffff11022b1830e
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000000000
FS:  000055557e384500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d9c80a7588 CR3: 0000000114bf5000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_add include/linux/refcount.h:-1 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 kref_get include/linux/kref.h:45 [inline]
 kobject_get+0xfb/0x120 lib/kobject.c:635
 get_device drivers/base/core.c:3794 [inline]
 device_add+0x2f0/0xec0 drivers/base/core.c:3618
 device_create_groups_vargs drivers/base/core.c:4392 [inline]
 device_create+0x26c/0x300 drivers/base/core.c:4434
 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:36
 create_alsa_device drivers/usb/gadget/function/f_midi.c:1306 [inline]
 f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1347
 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline]
 usb_get_function_instance+0xf3/0x310 drivers/usb/gadget/functions.c:44
 function_make+0x118/0x360 drivers/usb/gadget/configfs.c:652
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdirat fs/namei.c:4153 [inline]
 __se_sys_mkdirat fs/namei.c:4151 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4151
 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efc3279e159
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:00007ffcd1c73f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007efc32a25fa0 RCX: 00007efc3279e159
RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007efc3283506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc32a25fac R14: 00007efc32a25fa0 R15: 00007efc32a25fa0
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
refcount_t: saturated; leaking memory.
WARNING: CPU: 0 PID: 375 at lib/refcount.c:22 refcount_warn_saturate+0x158/0x1a0 lib/refcount.c:22
Modules linked in:
CPU: 0 PID: 375 Comm: syz.2.17 Tainted: G    B   W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:refcount_warn_saturate+0x158/0x1a0 lib/refcount.c:22
Code: 05 01 48 c7 c7 e0 13 ca 85 e8 64 c8 d8 fe 0f 0b eb 8b e8 9b 42 08 ff c6 05 aa 81 26 05 01 48 c7 c7 e0 13 ca 85 e8 48 c8 d8 fe <0f> 0b e9 6c ff ff ff e8 7c 42 08 ff c6 05 8f 81 26 05 01 48 c7 c7
RSP: 0018:ffffc900016f78d8 EFLAGS: 00010246
RAX: d3b30f91c800fc00 RBX: 0000000000000001 RCX: ffff88811460e540
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc900016f78e8 R08: ffffc900016f74c7 R09: 1ffff920002dee98
R10: dffffc0000000000 R11: fffff520002dee99 R12: dffffc0000000000
R13: ffff8881158c1818 R14: 0000000000000001 R15: 00000000c0000000
FS:  000055557e384500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d9c80c1a00 CR3: 0000000114bf5000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_add include/linux/refcount.h:-1 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 kref_get include/linux/kref.h:45 [inline]
 kobject_get lib/kobject.c:635 [inline]
 kobject_add_internal+0xa81/0xc20 lib/kobject.c:216
 kobject_add_varg lib/kobject.c:366 [inline]
 kobject_add+0x165/0x230 lib/kobject.c:418
 device_add+0x398/0xec0 drivers/base/core.c:3633
 device_create_groups_vargs drivers/base/core.c:4392 [inline]
 device_create+0x26c/0x300 drivers/base/core.c:4434
 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:36
 create_alsa_device drivers/usb/gadget/function/f_midi.c:1306 [inline]
 f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1347
 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline]
 usb_get_function_instance+0xf3/0x310 drivers/usb/gadget/functions.c:44
 function_make+0x118/0x360 drivers/usb/gadget/configfs.c:652
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdirat fs/namei.c:4153 [inline]
 __se_sys_mkdirat fs/namei.c:4151 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4151
 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efc3279e159
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:00007ffcd1c73f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007efc32a25fa0 RCX: 00007efc3279e159
RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007efc3283506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc32a25fac R14: 00007efc32a25fa0 R15: 00007efc32a25fa0
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 375 at lib/refcount.c:28 refcount_warn_saturate+0x120/0x1a0 lib/refcount.c:28
Modules linked in:
CPU: 0 PID: 375 Comm: syz.2.17 Tainted: G    B   W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:refcount_warn_saturate+0x120/0x1a0 lib/refcount.c:28
Code: 05 01 48 c7 c7 40 14 ca 85 e8 9c c8 d8 fe 0f 0b eb c3 e8 d3 42 08 ff c6 05 e4 81 26 05 01 48 c7 c7 a0 14 ca 85 e8 80 c8 d8 fe <0f> 0b eb a7 e8 b7 42 08 ff c6 05 c5 81 26 05 01 48 c7 c7 e0 13 ca
RSP: 0018:ffffc900016f78a0 EFLAGS: 00010246
RAX: d3b30f91c800fc00 RBX: 0000000000000003 RCX: ffff88811460e540
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc900016f78b0 R08: ffffc900016f7487 R09: 1ffff920002dee90
R10: dffffc0000000000 R11: fffff520002dee91 R12: 00000000c0000000
R13: ffff888115b4d83c R14: 0000000000000003 R15: ffff888115b4d838
FS:  000055557e384500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d9c80c1a00 CR3: 0000000114bf5000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 kref_put include/linux/kref.h:64 [inline]
 kobject_put+0x244/0x280 lib/kobject.c:729
 kobject_add_internal+0x9a2/0xc20 lib/kobject.c:234
 kobject_add_varg lib/kobject.c:366 [inline]
 kobject_add+0x165/0x230 lib/kobject.c:418
 device_add+0x398/0xec0 drivers/base/core.c:3633
 device_create_groups_vargs drivers/base/core.c:4392 [inline]
 device_create+0x26c/0x300 drivers/base/core.c:4434
 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:36
 create_alsa_device drivers/usb/gadget/function/f_midi.c:1306 [inline]
 f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1347
 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline]
 usb_get_function_instance+0xf3/0x310 drivers/usb/gadget/functions.c:44
 function_make+0x118/0x360 drivers/usb/gadget/configfs.c:652
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdirat fs/namei.c:4153 [inline]
 __se_sys_mkdirat fs/namei.c:4151 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4151
 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efc3279e159
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:00007ffcd1c73f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007efc32a25fa0 RCX: 00007efc3279e159
RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007efc3283506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc32a25fac R14: 00007efc32a25fa0 R15: 00007efc32a25fa0
 </TASK>
---[ end trace 0000000000000000 ]---
kobject_add_internal failed for f_midi (error: -2 parent: �Y�����w
)

final repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: use-after-free in kobject_get+0x113/0x120 lib/kobject.c:631
Read of size 1 at addr ffff888115b4d83c by task syz.2.17/375

CPU: 1 PID: 375 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:348
 kobject_get+0x113/0x120 lib/kobject.c:631
 get_device drivers/base/core.c:3794 [inline]
 device_add+0x2f0/0xec0 drivers/base/core.c:3618
 device_create_groups_vargs drivers/base/core.c:4392 [inline]
 device_create+0x26c/0x300 drivers/base/core.c:4434
 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:36
 create_alsa_device drivers/usb/gadget/function/f_midi.c:1306 [inline]
 f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1347
 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline]
 usb_get_function_instance+0xf3/0x310 drivers/usb/gadget/functions.c:44
 function_make+0x118/0x360 drivers/usb/gadget/configfs.c:652
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdirat fs/namei.c:4153 [inline]
 __se_sys_mkdirat fs/namei.c:4151 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4151
 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efc3279e159
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:00007ffcd1c73f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007efc32a25fa0 RCX: 00007efc3279e159
RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007efc3283506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc32a25fac R14: 00007efc32a25fa0 R15: 00007efc32a25fa0
 </TASK>

Allocated by task 375:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 kmalloc_trace+0x40/0xb0 mm/slab_common.c:1033
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 device_create_groups_vargs drivers/base/core.c:4374 [inline]
 device_create+0x13a/0x300 drivers/base/core.c:4434
 android_device_create drivers/usb/gadget/configfs.c:1784 [inline]
 gadgets_make+0x84a/0xad0 drivers/usb/gadget/configfs.c:1886
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdir fs/namei.c:4158 [inline]
 __se_sys_mkdir fs/namei.c:4156 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4156
 x64_sys_call+0x966/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:84
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 375:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1750 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
 slab_free mm/slub.c:3712 [inline]
 __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
 kfree+0x6f/0xf0 mm/slab_common.c:990
 device_create_release+0x15/0x20 drivers/base/core.c:4359
 device_release+0xa4/0x1d0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:681 [inline]
 kobject_release lib/kobject.c:712 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x19d/0x280 lib/kobject.c:729
 put_device drivers/base/core.c:3806 [inline]
 device_unregister drivers/base/core.c:3930 [inline]
 device_destroy+0xb4/0xf0 drivers/base/core.c:4500
 android_device_destroy drivers/usb/gadget/configfs.c:1816 [inline]
 gadgets_drop+0xa0/0xd0 drivers/usb/gadget/configfs.c:1904
 client_drop_item fs/configfs/dir.c:933 [inline]
 configfs_rmdir+0x89b/0x980 fs/configfs/dir.c:1536
 vfs_rmdir+0x381/0x4f0 fs/namei.c:4198
 do_rmdir+0x261/0x6b0 fs/namei.c:4259
 __do_sys_rmdir fs/namei.c:4278 [inline]
 __se_sys_rmdir fs/namei.c:4276 [inline]
 __x64_sys_rmdir+0x49/0x50 fs/namei.c:4276
 x64_sys_call+0x68e/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:85
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888115b4d800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 60 bytes inside of
 1024-byte region [ffff888115b4d800, ffff888115b4dc00)

The buggy address belongs to the physical page:
page:ffffea000456d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115b48
head:ffffea000456d200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea0004563000 dead000000000002 ffff888100043080
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 113, tgid 113 (udevd), ts 6618575377, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node_track_caller+0xa1/0x1e0 mm/slab_common.c:958
 kmalloc_reserve net/core/skbuff.c:449 [inline]
 __alloc_skb+0x226/0x4a0 net/core/skbuff.c:518
 alloc_skb include/linux/skbuff.h:1322 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1183 [inline]
 netlink_sendmsg+0x635/0xbd0 net/netlink/af_netlink.c:1853
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 ____sys_sendmsg+0x5fb/0x9c0 net/socket.c:2509
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2563
 __sys_sendmsg net/socket.c:2592 [inline]
 __do_sys_sendmsg net/socket.c:2601 [inline]
 __se_sys_sendmsg net/socket.c:2599 [inline]
 __x64_sys_sendmsg+0x20d/0x2e0 net/socket.c:2599
 x64_sys_call+0x171/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888115b4d700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888115b4d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888115b4d800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff888115b4d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888115b4d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 375 at lib/refcount.c:25 refcount_warn_saturate+0x104/0x1a0 lib/refcount.c:25
Modules linked in:
CPU: 1 PID: 375 Comm: syz.2.17 Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:refcount_warn_saturate+0x104/0x1a0 lib/refcount.c:25
Code: 05 01 48 c7 c7 00 15 ca 85 e8 b8 c8 d8 fe 0f 0b eb df e8 ef 42 08 ff c6 05 ff 81 26 05 01 48 c7 c7 40 14 ca 85 e8 9c c8 d8 fe <0f> 0b eb c3 e8 d3 42 08 ff c6 05 e4 81 26 05 01 48 c7 c7 a0 14 ca
RSP: 0018:ffffc900016f7a18 EFLAGS: 00010246
RAX: d3b30f91c800fc00 RBX: 0000000000000002 RCX: ffff88811460e540
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc900016f7a28 R08: ffffc900016f7607 R09: 1ffff920002deec0
R10: dffffc0000000000 R11: fffff520002deec1 R12: 1ffff11022b1830e
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000000000
FS:  000055557e384500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d9c80a7588 CR3: 0000000114bf5000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_add include/linux/refcount.h:-1 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 kref_get include/linux/kref.h:45 [inline]
 kobject_get+0xfb/0x120 lib/kobject.c:635
 get_device drivers/base/core.c:3794 [inline]
 device_add+0x2f0/0xec0 drivers/base/core.c:3618
 device_create_groups_vargs drivers/base/core.c:4392 [inline]
 device_create+0x26c/0x300 drivers/base/core.c:4434
 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:36
 create_alsa_device drivers/usb/gadget/function/f_midi.c:1306 [inline]
 f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1347
 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline]
 usb_get_function_instance+0xf3/0x310 drivers/usb/gadget/functions.c:44
 function_make+0x118/0x360 drivers/usb/gadget/configfs.c:652
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdirat fs/namei.c:4153 [inline]
 __se_sys_mkdirat fs/namei.c:4151 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4151
 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efc3279e159
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:00007ffcd1c73f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007efc32a25fa0 RCX: 00007efc3279e159
RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007efc3283506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc32a25fac R14: 00007efc32a25fa0 R15: 00007efc32a25fa0
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
refcount_t: saturated; leaking memory.
WARNING: CPU: 0 PID: 375 at lib/refcount.c:22 refcount_warn_saturate+0x158/0x1a0 lib/refcount.c:22
Modules linked in:
CPU: 0 PID: 375 Comm: syz.2.17 Tainted: G    B   W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:refcount_warn_saturate+0x158/0x1a0 lib/refcount.c:22
Code: 05 01 48 c7 c7 e0 13 ca 85 e8 64 c8 d8 fe 0f 0b eb 8b e8 9b 42 08 ff c6 05 aa 81 26 05 01 48 c7 c7 e0 13 ca 85 e8 48 c8 d8 fe <0f> 0b e9 6c ff ff ff e8 7c 42 08 ff c6 05 8f 81 26 05 01 48 c7 c7
RSP: 0018:ffffc900016f78d8 EFLAGS: 00010246
RAX: d3b30f91c800fc00 RBX: 0000000000000001 RCX: ffff88811460e540
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc900016f78e8 R08: ffffc900016f74c7 R09: 1ffff920002dee98
R10: dffffc0000000000 R11: fffff520002dee99 R12: dffffc0000000000
R13: ffff8881158c1818 R14: 0000000000000001 R15: 00000000c0000000
FS:  000055557e384500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d9c80c1a00 CR3: 0000000114bf5000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_add include/linux/refcount.h:-1 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 kref_get include/linux/kref.h:45 [inline]
 kobject_get lib/kobject.c:635 [inline]
 kobject_add_internal+0xa81/0xc20 lib/kobject.c:216
 kobject_add_varg lib/kobject.c:366 [inline]
 kobject_add+0x165/0x230 lib/kobject.c:418
 device_add+0x398/0xec0 drivers/base/core.c:3633
 device_create_groups_vargs drivers/base/core.c:4392 [inline]
 device_create+0x26c/0x300 drivers/base/core.c:4434
 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:36
 create_alsa_device drivers/usb/gadget/function/f_midi.c:1306 [inline]
 f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1347
 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline]
 usb_get_function_instance+0xf3/0x310 drivers/usb/gadget/functions.c:44
 function_make+0x118/0x360 drivers/usb/gadget/configfs.c:652
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdirat fs/namei.c:4153 [inline]
 __se_sys_mkdirat fs/namei.c:4151 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4151
 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efc3279e159
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:00007ffcd1c73f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007efc32a25fa0 RCX: 00007efc3279e159
RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007efc3283506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc32a25fac R14: 00007efc32a25fa0 R15: 00007efc32a25fa0
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 375 at lib/refcount.c:28 refcount_warn_saturate+0x120/0x1a0 lib/refcount.c:28
Modules linked in:
CPU: 0 PID: 375 Comm: syz.2.17 Tainted: G    B   W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:refcount_warn_saturate+0x120/0x1a0 lib/refcount.c:28
Code: 05 01 48 c7 c7 40 14 ca 85 e8 9c c8 d8 fe 0f 0b eb c3 e8 d3 42 08 ff c6 05 e4 81 26 05 01 48 c7 c7 a0 14 ca 85 e8 80 c8 d8 fe <0f> 0b eb a7 e8 b7 42 08 ff c6 05 c5 81 26 05 01 48 c7 c7 e0 13 ca
RSP: 0018:ffffc900016f78a0 EFLAGS: 00010246
RAX: d3b30f91c800fc00 RBX: 0000000000000003 RCX: ffff88811460e540
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc900016f78b0 R08: ffffc900016f7487 R09: 1ffff920002dee90
R10: dffffc0000000000 R11: fffff520002dee91 R12: 00000000c0000000
R13: ffff888115b4d83c R14: 0000000000000003 R15: ffff888115b4d838
FS:  000055557e384500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d9c80c1a00 CR3: 0000000114bf5000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 kref_put include/linux/kref.h:64 [inline]
 kobject_put+0x244/0x280 lib/kobject.c:729
 kobject_add_internal+0x9a2/0xc20 lib/kobject.c:234
 kobject_add_varg lib/kobject.c:366 [inline]
 kobject_add+0x165/0x230 lib/kobject.c:418
 device_add+0x398/0xec0 drivers/base/core.c:3633
 device_create_groups_vargs drivers/base/core.c:4392 [inline]
 device_create+0x26c/0x300 drivers/base/core.c:4434
 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:36
 create_alsa_device drivers/usb/gadget/function/f_midi.c:1306 [inline]
 f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1347
 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline]
 usb_get_function_instance+0xf3/0x310 drivers/usb/gadget/functions.c:44
 function_make+0x118/0x360 drivers/usb/gadget/configfs.c:652
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdirat fs/namei.c:4153 [inline]
 __se_sys_mkdirat fs/namei.c:4151 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4151
 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efc3279e159
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:00007ffcd1c73f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007efc32a25fa0 RCX: 00007efc3279e159
RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007efc3283506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc32a25fac R14: 00007efc32a25fa0 R15: 00007efc32a25fa0
 </TASK>
---[ end trace 0000000000000000 ]---
kobject_add_internal failed for f_midi (error: -2 parent: �Y�����w
)