Extracting prog: 1m10.378264416s Minimizing prog: 12m5.293832444s Simplifying prog options: 1m54.151637716s Extracting C: 33.44884058s Simplifying C: 0s 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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program crashed: KASAN: use-after-free Read in check_tty_count single: successfully extracted reproducer found reproducer with 8 syscalls minimizing guilty program testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, 0x0, 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, 0x0, &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', 0x0, 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(0x0, 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, 0x0, &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', 0x0, 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, 0x0, 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, 0x0, 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, 0x0, 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(0x0) program did not crash extracting C reproducer testing compiled C program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir program crashed: KASAN: use-after-free Read in tty_open a never seen crash title: KASAN: use-after-free Read in tty_open, ignore simplifying guilty program options testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program did not crash testing program (duration=32.077117129s, {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: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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program crashed: KASAN: use-after-free Write in release_tty a never seen crash title: KASAN: use-after-free Write in release_tty, ignore testing program (duration=32.077117129s, {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: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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program crashed: KASAN: use-after-free Write in release_tty a never seen crash title: KASAN: use-after-free Write in release_tty, ignore testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program crashed: KASAN: use-after-free Read in check_tty_count validation run: crashed=true testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program crashed: KASAN: use-after-free Read in check_tty_count validation run: crashed=true testing program (duration=32.077117129s, {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}}): mkdirat-mount-mkdir-mount-mkdirat-mkdirat-openat-rmdir detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./dev\x00', 0x13b) mount(0x0, &(0x7f00000000a0)='./dev\x00', &(0x7f00000000c0)='devtmpfs\x00', 0x0, 0x0) mkdir(&(0x7f0000000180)='./config\x00', 0x14) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/usb_gadget/g1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000200)='./config/usb_gadget/g1/functions/acm.usb0\x00', 0x1ff) openat(0xffffffffffffff9c, &(0x7f0000000800)='./dev/ttyGS0\x00', 0x2, 0x0) rmdir(&(0x7f0000000100)='./config/usb_gadget/g1/functions/acm.usb0\x00') program crashed: KASAN: use-after-free Read in check_tty_count validation run: crashed=true reproducing took 17m46.111604662s repro crashed as (corrupted=false): ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] BUG: KASAN: use-after-free in tty_port_kopened include/linux/tty.h:616 [inline] BUG: KASAN: use-after-free in check_tty_count+0x1a8/0x330 drivers/tty/tty_io.c:295 Read of size 8 at addr ffff8881139ad110 by task syz.5.17/391 CPU: 1 PID: 391 Comm: syz.5.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x100/0x140 mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 __kasan_check_read+0x11/0x20 mm/kasan/shadow.c:31 instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] tty_port_kopened include/linux/tty.h:616 [inline] check_tty_count+0x1a8/0x330 drivers/tty/tty_io.c:295 tty_release+0xc9/0x1330 drivers/tty/tty_io.c:1747 __fput+0x2dc/0x730 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9942c520d9 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:00007ffc5e0c5548 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f9942edbda0 RCX: 00007f9942c520d9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f9942edbda0 R08: 00007f9942eda038 R09: 0000000000000000 R10: 000000000003fda0 R11: 0000000000000246 R12: 000000000000a950 R13: 00007f9942ed9fac R14: 000000000000a64a R15: 00007ffc5e0c5650 Allocated by task 392: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x179/0x2e0 mm/slub.c:2979 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:667 [inline] gs_port_alloc drivers/usb/gadget/function/u_serial.c:1162 [inline] gserial_alloc_line_no_console+0x238/0x700 drivers/usb/gadget/function/u_serial.c:1242 gserial_alloc_line+0x15/0x20 drivers/usb/gadget/function/u_serial.c:1276 acm_alloc_instance+0x86/0xe0 drivers/usb/gadget/function/f_acm.c:849 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1354 vfs_mkdir+0x42c/0x600 fs/namei.c:3798 do_mkdirat+0x14c/0x340 fs/namei.c:3820 __do_sys_mkdirat fs/namei.c:3831 [inline] __se_sys_mkdirat fs/namei.c:3829 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3829 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 392: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1600 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kfree+0xc0/0x270 mm/slub.c:4196 gserial_free_port+0x240/0x2d0 drivers/usb/gadget/function/u_serial.c:1206 gserial_free_line+0x9f/0x1b0 drivers/usb/gadget/function/u_serial.c:1223 acm_free_instance+0x39/0x60 drivers/usb/gadget/function/f_acm.c:836 usb_put_function_instance+0x85/0xa0 drivers/usb/gadget/functions.c:77 acm_attr_release+0x15/0x20 drivers/usb/gadget/function/f_acm.c:785 config_item_cleanup fs/configfs/item.c:130 [inline] config_item_release fs/configfs/item.c:139 [inline] kref_put include/linux/kref.h:65 [inline] config_item_put+0x158/0x210 fs/configfs/item.c:151 configfs_rmdir+0x89f/0x960 fs/configfs/dir.c:1580 vfs_rmdir+0x1ab/0x3c0 fs/namei.c:3860 do_rmdir+0x232/0x630 fs/namei.c:3920 __do_sys_rmdir fs/namei.c:3938 [inline] __se_sys_rmdir fs/namei.c:3936 [inline] __x64_sys_rmdir+0x49/0x50 fs/namei.c:3936 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff8881139ad000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 272 bytes inside of 1024-byte region [ffff8881139ad000, ffff8881139ad400) The buggy address belongs to the page: page:ffffea00044e6a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1139a8 head:ffffea00044e6a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea00044e6200 0000000400000004 ffff888100042f00 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 105, ts 4373245269, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x176/0x190 mm/page_alloc.c:2462 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc_track_caller+0x1e4/0x310 mm/slub.c:4541 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xdc/0x520 net/core/skbuff.c:212 alloc_skb include/linux/skbuff.h:1126 [inline] alloc_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline] kobject_uevent_net_broadcast+0x335/0x5a0 lib/kobject_uevent.c:409 kobject_uevent_env+0x52b/0x700 lib/kobject_uevent.c:608 kobject_synth_uevent+0x452/0x940 lib/kobject_uevent.c:208 uevent_store+0x25/0x60 drivers/base/core.c:2320 dev_attr_store+0x5e/0x80 drivers/base/core.c:2018 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x2bd/0x400 fs/kernfs/file.c:296 page_owner free stack trace missing Memory state around the buggy address: ffff8881139ad000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881139ad080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881139ad100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881139ad180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881139ad200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ WARNING: CPU: 1 PID: 391 at drivers/usb/gadget/function/u_serial.c:690 gs_close+0x17d/0x9a0 drivers/usb/gadget/function/u_serial.c:690 Modules linked in: CPU: 1 PID: 391 Comm: syz.5.17 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:gs_close+0x17d/0x9a0 drivers/usb/gadget/function/u_serial.c:690 Code: 7c 56 fe 41 ff cc 42 0f b6 04 2b 84 c0 0f 85 c1 06 00 00 48 8b 44 24 20 44 89 20 48 8b 5c 24 38 e9 bd 02 00 00 e8 83 7c 56 fe <0f> 0b 48 8b 5c 24 38 e9 ac 02 00 00 e8 72 7c 56 fe 49 8d bf 90 02 RSP: 0018:ffffc90000e97c20 EFLAGS: 00010093 RAX: ffffffff830e295d RBX: 1ffff11022735a1a RCX: ffff88812a16e2c0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000e97d40 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520001d2f74 R12: 0000000000000000 R13: dffffc0000000000 R14: 1ffff920001d2f8c R15: ffff8881139ad000 FS: 0000555575829500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2779790d58 CR3: 00000001134d8000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tty_release+0x3c8/0x1330 drivers/tty/tty_io.c:1764 __fput+0x2dc/0x730 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9942c520d9 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:00007ffc5e0c5548 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f9942edbda0 RCX: 00007f9942c520d9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f9942edbda0 R08: 00007f9942eda038 R09: 0000000000000000 R10: 000000000003fda0 R11: 0000000000000246 R12: 000000000000a950 R13: 00007f9942ed9fac R14: 000000000000a64a R15: 00007ffc5e0c5650 ---[ end trace 7c09ebd2ac9d02d7 ]--- final repro crashed as (corrupted=false): ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] BUG: KASAN: use-after-free in tty_port_kopened include/linux/tty.h:616 [inline] BUG: KASAN: use-after-free in check_tty_count+0x1a8/0x330 drivers/tty/tty_io.c:295 Read of size 8 at addr ffff8881139ad110 by task syz.5.17/391 CPU: 1 PID: 391 Comm: syz.5.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x100/0x140 mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 __kasan_check_read+0x11/0x20 mm/kasan/shadow.c:31 instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] tty_port_kopened include/linux/tty.h:616 [inline] check_tty_count+0x1a8/0x330 drivers/tty/tty_io.c:295 tty_release+0xc9/0x1330 drivers/tty/tty_io.c:1747 __fput+0x2dc/0x730 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9942c520d9 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:00007ffc5e0c5548 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f9942edbda0 RCX: 00007f9942c520d9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f9942edbda0 R08: 00007f9942eda038 R09: 0000000000000000 R10: 000000000003fda0 R11: 0000000000000246 R12: 000000000000a950 R13: 00007f9942ed9fac R14: 000000000000a64a R15: 00007ffc5e0c5650 Allocated by task 392: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x179/0x2e0 mm/slub.c:2979 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:667 [inline] gs_port_alloc drivers/usb/gadget/function/u_serial.c:1162 [inline] gserial_alloc_line_no_console+0x238/0x700 drivers/usb/gadget/function/u_serial.c:1242 gserial_alloc_line+0x15/0x20 drivers/usb/gadget/function/u_serial.c:1276 acm_alloc_instance+0x86/0xe0 drivers/usb/gadget/function/f_acm.c:849 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1354 vfs_mkdir+0x42c/0x600 fs/namei.c:3798 do_mkdirat+0x14c/0x340 fs/namei.c:3820 __do_sys_mkdirat fs/namei.c:3831 [inline] __se_sys_mkdirat fs/namei.c:3829 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3829 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 392: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1600 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kfree+0xc0/0x270 mm/slub.c:4196 gserial_free_port+0x240/0x2d0 drivers/usb/gadget/function/u_serial.c:1206 gserial_free_line+0x9f/0x1b0 drivers/usb/gadget/function/u_serial.c:1223 acm_free_instance+0x39/0x60 drivers/usb/gadget/function/f_acm.c:836 usb_put_function_instance+0x85/0xa0 drivers/usb/gadget/functions.c:77 acm_attr_release+0x15/0x20 drivers/usb/gadget/function/f_acm.c:785 config_item_cleanup fs/configfs/item.c:130 [inline] config_item_release fs/configfs/item.c:139 [inline] kref_put include/linux/kref.h:65 [inline] config_item_put+0x158/0x210 fs/configfs/item.c:151 configfs_rmdir+0x89f/0x960 fs/configfs/dir.c:1580 vfs_rmdir+0x1ab/0x3c0 fs/namei.c:3860 do_rmdir+0x232/0x630 fs/namei.c:3920 __do_sys_rmdir fs/namei.c:3938 [inline] __se_sys_rmdir fs/namei.c:3936 [inline] __x64_sys_rmdir+0x49/0x50 fs/namei.c:3936 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff8881139ad000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 272 bytes inside of 1024-byte region [ffff8881139ad000, ffff8881139ad400) The buggy address belongs to the page: page:ffffea00044e6a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1139a8 head:ffffea00044e6a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea00044e6200 0000000400000004 ffff888100042f00 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 105, ts 4373245269, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x176/0x190 mm/page_alloc.c:2462 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc_track_caller+0x1e4/0x310 mm/slub.c:4541 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xdc/0x520 net/core/skbuff.c:212 alloc_skb include/linux/skbuff.h:1126 [inline] alloc_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline] kobject_uevent_net_broadcast+0x335/0x5a0 lib/kobject_uevent.c:409 kobject_uevent_env+0x52b/0x700 lib/kobject_uevent.c:608 kobject_synth_uevent+0x452/0x940 lib/kobject_uevent.c:208 uevent_store+0x25/0x60 drivers/base/core.c:2320 dev_attr_store+0x5e/0x80 drivers/base/core.c:2018 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x2bd/0x400 fs/kernfs/file.c:296 page_owner free stack trace missing Memory state around the buggy address: ffff8881139ad000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881139ad080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881139ad100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881139ad180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881139ad200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ WARNING: CPU: 1 PID: 391 at drivers/usb/gadget/function/u_serial.c:690 gs_close+0x17d/0x9a0 drivers/usb/gadget/function/u_serial.c:690 Modules linked in: CPU: 1 PID: 391 Comm: syz.5.17 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:gs_close+0x17d/0x9a0 drivers/usb/gadget/function/u_serial.c:690 Code: 7c 56 fe 41 ff cc 42 0f b6 04 2b 84 c0 0f 85 c1 06 00 00 48 8b 44 24 20 44 89 20 48 8b 5c 24 38 e9 bd 02 00 00 e8 83 7c 56 fe <0f> 0b 48 8b 5c 24 38 e9 ac 02 00 00 e8 72 7c 56 fe 49 8d bf 90 02 RSP: 0018:ffffc90000e97c20 EFLAGS: 00010093 RAX: ffffffff830e295d RBX: 1ffff11022735a1a RCX: ffff88812a16e2c0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000e97d40 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520001d2f74 R12: 0000000000000000 R13: dffffc0000000000 R14: 1ffff920001d2f8c R15: ffff8881139ad000 FS: 0000555575829500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2779790d58 CR3: 00000001134d8000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tty_release+0x3c8/0x1330 drivers/tty/tty_io.c:1764 __fput+0x2dc/0x730 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9942c520d9 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:00007ffc5e0c5548 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f9942edbda0 RCX: 00007f9942c520d9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f9942edbda0 R08: 00007f9942eda038 R09: 0000000000000000 R10: 000000000003fda0 R11: 0000000000000246 R12: 000000000000a950 R13: 00007f9942ed9fac R14: 000000000000a64a R15: 00007ffc5e0c5650 ---[ end trace 7c09ebd2ac9d02d7 ]---