Extracting prog: 7m37.427350877s
Minimizing prog: 1h33m4.216257571s
Simplifying prog options: 0s
Extracting C: 2m51.826724321s
Simplifying C: 49m59.394388848s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
r3 = socket$nl_route(0x10, 0x3, 0x0)
r4 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r4, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r5=>0x0})
sendmsg$nl_route_sched(r3, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r5}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 1m40s
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
r3 = socket$nl_route(0x10, 0x3, 0x0)
r4 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r4, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r5=>0x0})
sendmsg$nl_route_sched(r3, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r5}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
r3 = socket$nl_route(0x10, 0x3, 0x0)
r4 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r4, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r5=>0x0})
sendmsg$nl_route_sched(r3, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r5}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program crashed: unregister_netdevice: waiting for DEV to become free
single: successfully extracted reproducer
found reproducer with 9 syscalls
minimizing guilty program
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
socket$nl_route(0x10, 0x3, 0x0)
r3 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r3, 0x8933, &(0x7f0000000000)={'vcan0\x00'})

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
r3 = socket$nl_route(0x10, 0x3, 0x0)
socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
sendmsg$nl_route_sched(r3, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
r3 = socket$nl_route(0x10, 0x3, 0x0)
r4 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r4, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r5=>0x0})
sendmsg$nl_route_sched(r3, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r5}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
r3 = socket$nl_route(0x10, 0x3, 0x0)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(0xffffffffffffffff, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r4=>0x0})
sendmsg$nl_route_sched(r3, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r4}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
r3 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r3, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r4=>0x0})
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r4}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00'})
socket$can_j1939(0x1d, 0x2, 0x7)
r1 = socket$nl_route(0x10, 0x3, 0x0)
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r2, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r3=>0x0})
sendmsg$nl_route_sched(r1, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r3}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
bind$can_j1939(0xffffffffffffffff, &(0x7f0000000080)={0x1d, r1}, 0x18)
r2 = socket$nl_route(0x10, 0x3, 0x0)
r3 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r3, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r4=>0x0})
sendmsg$nl_route_sched(r2, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r4}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
socket$can_j1939(0x1d, 0x2, 0x7)
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r0, &(0x7f0000000080), 0x18)
r1 = socket$nl_route(0x10, 0x3, 0x0)
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r2, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r3=>0x0})
sendmsg$nl_route_sched(r1, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r3}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
ioctl$ifreq_SIOCGIFINDEX_vcan(0xffffffffffffffff, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r0=>0x0})
r1 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r1, &(0x7f0000000080)={0x1d, r0}, 0x18)
r2 = socket$nl_route(0x10, 0x3, 0x0)
r3 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r3, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r4=>0x0})
sendmsg$nl_route_sched(r2, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r4}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, 0x0)
r1 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r1, &(0x7f0000000080), 0x18)
r2 = socket$nl_route(0x10, 0x3, 0x0)
r3 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r3, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r4=>0x0})
sendmsg$nl_route_sched(r2, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r4}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00'})
r1 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r1, 0x0, 0x0)
r2 = socket$nl_route(0x10, 0x3, 0x0)
r3 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r3, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r4=>0x0})
sendmsg$nl_route_sched(r2, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74, r4}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
r3 = socket$nl_route(0x10, 0x3, 0x0)
r4 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r4, 0x8933, 0x0)
sendmsg$nl_route_sched(r3, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000f00)=@newtfilter={0x24, 0x11, 0x1, 0x0, 0x0, {0x0, 0x0, 0x74}}, 0x24}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
r3 = socket$nl_route(0x10, 0x3, 0x0)
r4 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r4, 0x8933, &(0x7f0000000000)={'vcan0\x00'})
sendmsg$nl_route_sched(r3, 0x0, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
r3 = socket$nl_route(0x10, 0x3, 0x0)
r4 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r4, 0x8933, &(0x7f0000000000)={'vcan0\x00'})
sendmsg$nl_route_sched(r3, &(0x7f0000000140)={0x0, 0x0, 0x0, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$can_j1939(0x1d, 0x2, 0x7)
ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000000)={'vcan0\x00', <r1=>0x0})
r2 = socket$can_j1939(0x1d, 0x2, 0x7)
bind$can_j1939(r2, &(0x7f0000000080)={0x1d, r1}, 0x18)
r3 = socket$nl_route(0x10, 0x3, 0x0)
r4 = socket$can_j1939(0x1d, 0x2, 0x7)
unshare(0x24020400)
ioctl$ifreq_SIOCGIFINDEX_vcan(r4, 0x8933, &(0x7f0000000000)={'vcan0\x00'})
sendmsg$nl_route_sched(r3, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000240)={0x0}, 0x1, 0xf0ffffffffffff}, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
simplifying C reproducer
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program did not crash
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:false HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:true UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$can_j1939-ioctl$ifreq_SIOCGIFINDEX_vcan-socket$can_j1939-bind$can_j1939-socket$nl_route-socket$can_j1939-unshare-ioctl$ifreq_SIOCGIFINDEX_vcan-sendmsg$nl_route_sched
program crashed: unregister_netdevice: waiting for DEV to become free
reproducing took 2h33m32.864745779s
repro crashed as (corrupted=false):
netlink: 4 bytes leftover after parsing attributes in process `syz-executor331'.
unregister_netdevice: waiting for vcan0 to become free. Usage count = 2

final repro crashed as (corrupted=false):
netlink: 4 bytes leftover after parsing attributes in process `syz-executor331'.
unregister_netdevice: waiting for vcan0 to become free. Usage count = 2