Extracting prog: 2m14.890827305s
Minimizing prog: 39m33.612825459s
Simplifying prog options: 6m38.712912889s
Extracting C: 1m29.414438477s
Simplifying C: 0s
extracting reproducer from 30 programs
first checking the prog from the crash report
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs: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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-ioctl$BLKSECTGET-getpgrp-syz_pidfd_open-fremovexattr-bpf$MAP_UPDATE_CONST_STR-io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ-io_uring_register$IORING_REGISTER_ZCRX_CTRL-ioctl$XFS_IOC_FD_TO_HANDLE-ioctl$XFS_IOC_SWAPEXT-lremovexattr
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
ioctl$BLKSECTGET(r0, 0x1267, &(0x7f00000002c0))
r1 = getpgrp(0x0)
r2 = syz_pidfd_open(r1, 0x0)
fremovexattr(r2, &(0x7f0000000280)=@known='trusted.overlay.nlink\x00')
bpf$MAP_UPDATE_CONST_STR(0x2, &(0x7f0000000080)={{}, &(0x7f0000000000), &(0x7f0000000040)='%ps \x00'}, 0x20)
r3 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r3, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
io_uring_register$IORING_REGISTER_ZCRX_CTRL(r3, 0x24, &(0x7f0000000400), 0x0)
ioctl$XFS_IOC_FD_TO_HANDLE(0xffffffffffffffff, 0xc038586a, 0x0)
ioctl$XFS_IOC_SWAPEXT(r2, 0xc0c0586d, 0x0)
lremovexattr(0x0, 0x0)
program crashed: WARNING: refcount bug in zcrx_unregister_user
single: successfully extracted reproducer
found reproducer with 13 syscalls
minimizing guilty program
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-ioctl$BLKSECTGET-getpgrp-syz_pidfd_open-fremovexattr-bpf$MAP_UPDATE_CONST_STR-io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ-io_uring_register$IORING_REGISTER_ZCRX_CTRL-ioctl$XFS_IOC_FD_TO_HANDLE-ioctl$XFS_IOC_SWAPEXT
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
ioctl$BLKSECTGET(r0, 0x1267, &(0x7f00000002c0))
r1 = getpgrp(0x0)
r2 = syz_pidfd_open(r1, 0x0)
fremovexattr(r2, &(0x7f0000000280)=@known='trusted.overlay.nlink\x00')
bpf$MAP_UPDATE_CONST_STR(0x2, &(0x7f0000000080)={{}, &(0x7f0000000000), &(0x7f0000000040)='%ps \x00'}, 0x20)
r3 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r3, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
io_uring_register$IORING_REGISTER_ZCRX_CTRL(r3, 0x24, &(0x7f0000000400), 0x0)
ioctl$XFS_IOC_FD_TO_HANDLE(0xffffffffffffffff, 0xc038586a, 0x0)
ioctl$XFS_IOC_SWAPEXT(r2, 0xc0c0586d, 0x0)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-ioctl$BLKSECTGET-getpgrp-syz_pidfd_open-fremovexattr-bpf$MAP_UPDATE_CONST_STR-io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ-io_uring_register$IORING_REGISTER_ZCRX_CTRL-ioctl$XFS_IOC_FD_TO_HANDLE
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
ioctl$BLKSECTGET(r0, 0x1267, &(0x7f00000002c0))
r1 = getpgrp(0x0)
r2 = syz_pidfd_open(r1, 0x0)
fremovexattr(r2, &(0x7f0000000280)=@known='trusted.overlay.nlink\x00')
bpf$MAP_UPDATE_CONST_STR(0x2, &(0x7f0000000080)={{}, &(0x7f0000000000), &(0x7f0000000040)='%ps \x00'}, 0x20)
r3 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r3, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
io_uring_register$IORING_REGISTER_ZCRX_CTRL(r3, 0x24, &(0x7f0000000400), 0x0)
ioctl$XFS_IOC_FD_TO_HANDLE(0xffffffffffffffff, 0xc038586a, 0x0)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-ioctl$BLKSECTGET-getpgrp-syz_pidfd_open-fremovexattr-bpf$MAP_UPDATE_CONST_STR-io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ-io_uring_register$IORING_REGISTER_ZCRX_CTRL
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
ioctl$BLKSECTGET(r0, 0x1267, &(0x7f00000002c0))
r1 = getpgrp(0x0)
r2 = syz_pidfd_open(r1, 0x0)
fremovexattr(r2, &(0x7f0000000280)=@known='trusted.overlay.nlink\x00')
bpf$MAP_UPDATE_CONST_STR(0x2, &(0x7f0000000080)={{}, &(0x7f0000000000), &(0x7f0000000040)='%ps \x00'}, 0x20)
r3 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r3, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
io_uring_register$IORING_REGISTER_ZCRX_CTRL(r3, 0x24, &(0x7f0000000400), 0x0)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-ioctl$BLKSECTGET-getpgrp-syz_pidfd_open-fremovexattr-bpf$MAP_UPDATE_CONST_STR-io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
ioctl$BLKSECTGET(r0, 0x1267, &(0x7f00000002c0))
r1 = getpgrp(0x0)
r2 = syz_pidfd_open(r1, 0x0)
fremovexattr(r2, &(0x7f0000000280)=@known='trusted.overlay.nlink\x00')
bpf$MAP_UPDATE_CONST_STR(0x2, &(0x7f0000000080)={{}, &(0x7f0000000000), &(0x7f0000000040)='%ps \x00'}, 0x20)
r3 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r3, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-ioctl$BLKSECTGET-getpgrp-syz_pidfd_open-fremovexattr-bpf$MAP_UPDATE_CONST_STR-io_uring_setup
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
ioctl$BLKSECTGET(r0, 0x1267, &(0x7f00000002c0))
r1 = getpgrp(0x0)
r2 = syz_pidfd_open(r1, 0x0)
fremovexattr(r2, &(0x7f0000000280)=@known='trusted.overlay.nlink\x00')
bpf$MAP_UPDATE_CONST_STR(0x2, &(0x7f0000000080)={{}, &(0x7f0000000000), &(0x7f0000000040)='%ps \x00'}, 0x20)
io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
program did not crash
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-ioctl$BLKSECTGET-getpgrp-syz_pidfd_open-fremovexattr-bpf$MAP_UPDATE_CONST_STR-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
ioctl$BLKSECTGET(r0, 0x1267, &(0x7f00000002c0))
r1 = getpgrp(0x0)
r2 = syz_pidfd_open(r1, 0x0)
fremovexattr(r2, &(0x7f0000000280)=@known='trusted.overlay.nlink\x00')
bpf$MAP_UPDATE_CONST_STR(0x2, &(0x7f0000000080)={{}, &(0x7f0000000000), &(0x7f0000000040)='%ps \x00'}, 0x20)
io_uring_register$IORING_REGISTER_ZCRX_IFQ(0xffffffffffffffff, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program did not crash
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-ioctl$BLKSECTGET-getpgrp-syz_pidfd_open-fremovexattr-io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
ioctl$BLKSECTGET(r0, 0x1267, &(0x7f00000002c0))
r1 = getpgrp(0x0)
r2 = syz_pidfd_open(r1, 0x0)
fremovexattr(r2, &(0x7f0000000280)=@known='trusted.overlay.nlink\x00')
r3 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r3, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-ioctl$BLKSECTGET-getpgrp-syz_pidfd_open-io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
ioctl$BLKSECTGET(r0, 0x1267, &(0x7f00000002c0))
r1 = getpgrp(0x0)
syz_pidfd_open(r1, 0x0)
r2 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r2, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-ioctl$BLKSECTGET-getpgrp-io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
ioctl$BLKSECTGET(r0, 0x1267, &(0x7f00000002c0))
getpgrp(0x0)
r1 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r1, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-ioctl$BLKSECTGET-io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
ioctl$BLKSECTGET(r0, 0x1267, &(0x7f00000002c0))
r1 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r1, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-fcntl$setlease-io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
fcntl$setlease(r0, 0x400, 0x0)
r1 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r1, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): open-io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
open(&(0x7f00009e1000)='./file0\x00', 0x60840, 0x0)
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, 0x0)
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={&(0x7f0000001000)='\x00'/3930, 0xf5a}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program did not crash
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, 0x0, 0x1)
program did not crash
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, 0x0, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program did not crash
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={0x0}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={0x0}, 0x0, {}, 0x0, 0x1000}, 0x1)
program did not crash
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={0x0}, &(0x7f0000000300)={0x0, 0x0, 0x1}, {}, 0x0, 0x1000}, 0x1)
program did not crash
testing program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={0x0}, &(0x7f0000000300)={&(0x7f0000002000), 0x0, 0x1}, {}, 0x0, 0x1000}, 0x1)
program did not crash
extracting C reproducer
testing compiled C program (duration=45.456389187s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
program did not crash
simplifying guilty program options
testing program (duration=45.456389187s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={0x0}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
extracting C reproducer
testing compiled C program (duration=45.456389187s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
program did not crash
testing program (duration=45.456389187s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={0x0}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
extracting C reproducer
testing compiled C program (duration=45.456389187s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
program did not crash
testing program (duration=45.456389187s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={0x0}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
validation run: crashed=true
testing program (duration=45.456389187s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={0x0}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
validation run: crashed=true
testing program (duration=45.456389187s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): io_uring_setup-io_uring_register$IORING_REGISTER_ZCRX_IFQ
detailed listing:
executing program 0:
r0 = io_uring_setup(0x1, &(0x7f0000000080)={0x0, 0x0, 0x3800, 0x0, 0x0, 0x0, 0x0})
io_uring_register$IORING_REGISTER_ZCRX_IFQ(r0, 0x20, &(0x7f0000000100)={0x1, 0x0, 0x8, 0x0, &(0x7f0000000200)={0x0}, &(0x7f0000000300)={&(0x7f0000002000)='\x00'/4096, 0x1000, 0x1}, {}, 0x0, 0x1000}, 0x1)
program crashed: WARNING: refcount bug in zcrx_unregister_user
validation run: crashed=true
reproducing took 55m30.807237967s
repro crashed as (corrupted=false):
------------[ cut here ]------------
refcount_t: decrement hit 0; leaking memory.
WARNING: lib/refcount.c:31 at refcount_warn_saturate+0x70/0x110 lib/refcount.c:31, CPU#0: syz.0.17/5888
Modules linked in:
CPU: 0 UID: 0 PID: 5888 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:refcount_warn_saturate+0x70/0x110 lib/refcount.c:31
Code: c6 c0 fe 36 8f e8 90 e5 ee fc 83 fb 01 7e 22 83 fb 02 74 39 83 fb 03 74 47 83 fb 04 75 68 e8 f7 df ee fc 48 8d 3d b0 16 8b 0b <67> 48 0f b9 3a eb 66 85 db 74 3e 83 fb 01 75 4c e8 db df ee fc 48
RSP: 0018:ffffc9000330f8c8 EFLAGS: 00010293
RAX: ffffffff84d8a429 RBX: 0000000000000004 RCX: ffff8880314dbe80
RDX: 0000000000000000 RSI: ffffffff8f36fec0 RDI: ffffffff9063bae0
RBP: ffffc9000330fa10 R08: ffff8880314dbe80 R09: 0000000000000005
R10: 0000000000000004 R11: 0000000000000000 R12: ffff888031abe700
R13: dffffc0000000000 R14: ffff888031abe744 R15: 0000000000000001
FS: 000055555c229500(0000) GS:ffff888124f12000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002020 CR3: 000000007082e000 CR4: 00000000003526f0
Call Trace:
__refcount_dec include/linux/refcount.h:461 [inline]
refcount_dec include/linux/refcount.h:476 [inline]
ref_tracker_free+0x706/0x830 lib/ref_tracker.c:303
netdev_tracker_free include/linux/netdevice.h:4545 [inline]
netdev_put include/linux/netdevice.h:4562 [inline]
io_close_queue io_uring/zcrx.c:582 [inline]
zcrx_unregister_user+0x2d8/0x430 io_uring/zcrx.c:681
zcrx_unregister io_uring/zcrx.c:688 [inline]
io_register_zcrx+0x875/0xc00 io_uring/zcrx.c:1021
__io_uring_register io_uring/register.c:942 [inline]
__do_sys_io_uring_register io_uring/register.c:1040 [inline]
__se_sys_io_uring_register+0xc23/0x1ab0 io_uring/register.c:1017
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x510 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f649a59e0d9
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:00007ffd676b9338 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 00007f649a825fa0 RCX: 00007f649a59e0d9
RDX: 0000200000000100 RSI: 0000000000000020 RDI: 0000000000000003
RBP: 00007f649a635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f649a825fac R14: 00007f649a825fa0 R15: 00007f649a825fa0
----------------
Code disassembly (best guess), 5 bytes skipped:
0: e8 90 e5 ee fc call 0xfceee595
5: 83 fb 01 cmp $0x1,%ebx
8: 7e 22 jle 0x2c
a: 83 fb 02 cmp $0x2,%ebx
d: 74 39 je 0x48
f: 83 fb 03 cmp $0x3,%ebx
12: 74 47 je 0x5b
14: 83 fb 04 cmp $0x4,%ebx
17: 75 68 jne 0x81
19: e8 f7 df ee fc call 0xfceee015
1e: 48 8d 3d b0 16 8b 0b lea 0xb8b16b0(%rip),%rdi # 0xb8b16d5
* 25: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2a: eb 66 jmp 0x92
2c: 85 db test %ebx,%ebx
2e: 74 3e je 0x6e
30: 83 fb 01 cmp $0x1,%ebx
33: 75 4c jne 0x81
35: e8 db df ee fc call 0xfceee015
3a: 48 rex.W
final repro crashed as (corrupted=false):
------------[ cut here ]------------
refcount_t: decrement hit 0; leaking memory.
WARNING: lib/refcount.c:31 at refcount_warn_saturate+0x70/0x110 lib/refcount.c:31, CPU#0: syz.0.17/5888
Modules linked in:
CPU: 0 UID: 0 PID: 5888 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:refcount_warn_saturate+0x70/0x110 lib/refcount.c:31
Code: c6 c0 fe 36 8f e8 90 e5 ee fc 83 fb 01 7e 22 83 fb 02 74 39 83 fb 03 74 47 83 fb 04 75 68 e8 f7 df ee fc 48 8d 3d b0 16 8b 0b <67> 48 0f b9 3a eb 66 85 db 74 3e 83 fb 01 75 4c e8 db df ee fc 48
RSP: 0018:ffffc9000330f8c8 EFLAGS: 00010293
RAX: ffffffff84d8a429 RBX: 0000000000000004 RCX: ffff8880314dbe80
RDX: 0000000000000000 RSI: ffffffff8f36fec0 RDI: ffffffff9063bae0
RBP: ffffc9000330fa10 R08: ffff8880314dbe80 R09: 0000000000000005
R10: 0000000000000004 R11: 0000000000000000 R12: ffff888031abe700
R13: dffffc0000000000 R14: ffff888031abe744 R15: 0000000000000001
FS: 000055555c229500(0000) GS:ffff888124f12000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002020 CR3: 000000007082e000 CR4: 00000000003526f0
Call Trace:
__refcount_dec include/linux/refcount.h:461 [inline]
refcount_dec include/linux/refcount.h:476 [inline]
ref_tracker_free+0x706/0x830 lib/ref_tracker.c:303
netdev_tracker_free include/linux/netdevice.h:4545 [inline]
netdev_put include/linux/netdevice.h:4562 [inline]
io_close_queue io_uring/zcrx.c:582 [inline]
zcrx_unregister_user+0x2d8/0x430 io_uring/zcrx.c:681
zcrx_unregister io_uring/zcrx.c:688 [inline]
io_register_zcrx+0x875/0xc00 io_uring/zcrx.c:1021
__io_uring_register io_uring/register.c:942 [inline]
__do_sys_io_uring_register io_uring/register.c:1040 [inline]
__se_sys_io_uring_register+0xc23/0x1ab0 io_uring/register.c:1017
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x510 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f649a59e0d9
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:00007ffd676b9338 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 00007f649a825fa0 RCX: 00007f649a59e0d9
RDX: 0000200000000100 RSI: 0000000000000020 RDI: 0000000000000003
RBP: 00007f649a635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f649a825fac R14: 00007f649a825fa0 R15: 00007f649a825fa0
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Code disassembly (best guess), 5 bytes skipped:
0: e8 90 e5 ee fc call 0xfceee595
5: 83 fb 01 cmp $0x1,%ebx
8: 7e 22 jle 0x2c
a: 83 fb 02 cmp $0x2,%ebx
d: 74 39 je 0x48
f: 83 fb 03 cmp $0x3,%ebx
12: 74 47 je 0x5b
14: 83 fb 04 cmp $0x4,%ebx
17: 75 68 jne 0x81
19: e8 f7 df ee fc call 0xfceee015
1e: 48 8d 3d b0 16 8b 0b lea 0xb8b16b0(%rip),%rdi # 0xb8b16d5
* 25: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2a: eb 66 jmp 0x92
2c: 85 db test %ebx,%ebx
2e: 74 3e je 0x6e
30: 83 fb 01 cmp $0x1,%ebx
33: 75 4c jne 0x81
35: e8 db df ee fc call 0xfceee015
3a: 48 rex.W