Extracting prog: 2m14.213516954s
Minimizing prog: 31m36.421681909s
Simplifying prog options: 0s
Extracting C: 35.645158792s
Simplifying C: 7m53.064669874s


extracting reproducer from 2 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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-openat$vnet-pipe-socket$inet_udp-write$binfmt_misc-splice
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
r2 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r3=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r2, 0xab00, r3)
ioctl$NBD_SET_SIZE_BLOCKS(r2, 0xab07, 0x4)
ioctl$NBD_DO_IT(r2, 0xab03)
ioctl$NBD_CLEAR_SOCK(r2, 0xab04)
openat$vnet(0xffffffffffffff9c, &(0x7f0000000180), 0x2, 0x0)
pipe(0x0)
r4 = socket$inet_udp(0x2, 0x2, 0x0)
write$binfmt_misc(0xffffffffffffffff, &(0x7f0000000000), 0xfffffecc)
splice(0xffffffffffffffff, 0x0, r4, 0x0, 0x4ffe6, 0x0)

program crashed: WARNING: refcount bug in bt_tags_iter
single: successfully extracted reproducer
found reproducer with 17 syscalls
minimizing guilty program
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-openat$vnet-pipe-socket$inet_udp-write$binfmt_misc
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
r2 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r3=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r2, 0xab00, r3)
ioctl$NBD_SET_SIZE_BLOCKS(r2, 0xab07, 0x4)
ioctl$NBD_DO_IT(r2, 0xab03)
ioctl$NBD_CLEAR_SOCK(r2, 0xab04)
openat$vnet(0xffffffffffffff9c, &(0x7f0000000180), 0x2, 0x0)
pipe(0x0)
socket$inet_udp(0x2, 0x2, 0x0)
write$binfmt_misc(0xffffffffffffffff, &(0x7f0000000000), 0xfffffecc)

program crashed: lost connection to test machine
suppressed program crash: lost connection to test machine
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-openat$vnet-pipe-socket$inet_udp-splice
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
r2 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r3=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r2, 0xab00, r3)
ioctl$NBD_SET_SIZE_BLOCKS(r2, 0xab07, 0x4)
ioctl$NBD_DO_IT(r2, 0xab03)
ioctl$NBD_CLEAR_SOCK(r2, 0xab04)
openat$vnet(0xffffffffffffff9c, &(0x7f0000000180), 0x2, 0x0)
pipe(0x0)
r4 = socket$inet_udp(0x2, 0x2, 0x0)
splice(0xffffffffffffffff, 0x0, r4, 0x0, 0x4ffe6, 0x0)

program crashed: WARNING: refcount bug in blk_mq_dispatch_rq_list
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-openat$vnet-pipe-splice
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
r2 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r3=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r2, 0xab00, r3)
ioctl$NBD_SET_SIZE_BLOCKS(r2, 0xab07, 0x4)
ioctl$NBD_DO_IT(r2, 0xab03)
ioctl$NBD_CLEAR_SOCK(r2, 0xab04)
openat$vnet(0xffffffffffffff9c, &(0x7f0000000180), 0x2, 0x0)
pipe(0x0)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program crashed: WARNING: refcount bug in blk_done_softirq
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-openat$vnet-splice
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
r2 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r3=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r2, 0xab00, r3)
ioctl$NBD_SET_SIZE_BLOCKS(r2, 0xab07, 0x4)
ioctl$NBD_DO_IT(r2, 0xab03)
ioctl$NBD_CLEAR_SOCK(r2, 0xab04)
openat$vnet(0xffffffffffffff9c, &(0x7f0000000180), 0x2, 0x0)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program crashed: WARNING: refcount bug in blk_mq_dispatch_rq_list
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
r2 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r3=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r2, 0xab00, r3)
ioctl$NBD_SET_SIZE_BLOCKS(r2, 0xab07, 0x4)
ioctl$NBD_DO_IT(r2, 0xab03)
ioctl$NBD_CLEAR_SOCK(r2, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program crashed: WARNING: refcount bug in blk_done_softirq
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-splice
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
r2 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r3=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r2, 0xab00, r3)
ioctl$NBD_SET_SIZE_BLOCKS(r2, 0xab07, 0x4)
ioctl$NBD_DO_IT(r2, 0xab03)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
r2 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r3=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r2, 0xab00, r3)
ioctl$NBD_SET_SIZE_BLOCKS(r2, 0xab07, 0x4)
ioctl$NBD_CLEAR_SOCK(r2, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
r2 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r3=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r2, 0xab00, r3)
ioctl$NBD_DO_IT(r2, 0xab03)
ioctl$NBD_CLEAR_SOCK(r2, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
r2 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040))
ioctl$NBD_SET_SIZE_BLOCKS(r2, 0xab07, 0x4)
ioctl$NBD_DO_IT(r2, 0xab03)
ioctl$NBD_CLEAR_SOCK(r2, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-syz_open_dev$ndb-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
r2 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
ioctl$NBD_SET_SOCK(r2, 0xab00, 0xffffffffffffffff)
ioctl$NBD_SET_SIZE_BLOCKS(r2, 0xab07, 0x4)
ioctl$NBD_DO_IT(r2, 0xab03)
ioctl$NBD_CLEAR_SOCK(r2, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-connect$bt_l2cap-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r1 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r1}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
connect$bt_l2cap(r0, 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(0xffffffffffffffff, 0xab00, r2)
ioctl$NBD_SET_SIZE_BLOCKS(0xffffffffffffffff, 0xab07, 0x4)
ioctl$NBD_DO_IT(0xffffffffffffffff, 0xab03)
ioctl$NBD_CLEAR_SOCK(0xffffffffffffffff, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_init_net_socket$bt_l2cap-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r0 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r0}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0)
r1 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_SET_SIZE_BLOCKS(r1, 0xab07, 0x4)
ioctl$NBD_DO_IT(r1, 0xab03)
ioctl$NBD_CLEAR_SOCK(r1, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program crashed: WARNING: refcount bug in blk_done_softirq
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r0 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r0}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
r1 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_SET_SIZE_BLOCKS(r1, 0xab07, 0x4)
ioctl$NBD_DO_IT(r1, 0xab03)
ioctl$NBD_CLEAR_SOCK(r1, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program crashed: WARNING: refcount bug in blk_mq_dispatch_rq_list
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_create-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r0 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r0}, &(0x7f0000bbdffc))
r1 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_SET_SIZE_BLOCKS(r1, 0xab07, 0x4)
ioctl$NBD_DO_IT(r1, 0xab03)
ioctl$NBD_CLEAR_SOCK(r1, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-gettid-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
gettid()
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r1=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r0, 0xab00, r1)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x4)
ioctl$NBD_DO_IT(r0, 0xab03)
ioctl$NBD_CLEAR_SOCK(r0, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): openat$cgroup_ro-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r1=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r0, 0xab00, r1)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x4)
ioctl$NBD_DO_IT(r0, 0xab03)
ioctl$NBD_CLEAR_SOCK(r0, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
r0 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r0}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
r1 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_SET_SIZE_BLOCKS(r1, 0xab07, 0x4)
ioctl$NBD_DO_IT(r1, 0xab03)
ioctl$NBD_CLEAR_SOCK(r1, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program crashed: WARNING: refcount bug in blk_mq_dispatch_rq_list
testing program (duration=58.686702042s, {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}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
gettid()
timer_create(0x0, 0x0, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r1=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r0, 0xab00, r1)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x4)
ioctl$NBD_DO_IT(r0, 0xab03)
ioctl$NBD_CLEAR_SOCK(r0, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
r0 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r0}, 0x0)
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
r1 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_SET_SIZE_BLOCKS(r1, 0xab07, 0x4)
ioctl$NBD_DO_IT(r1, 0xab03)
ioctl$NBD_CLEAR_SOCK(r1, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
r0 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r0}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, 0x0, 0x0)
r1 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_SET_SIZE_BLOCKS(r1, 0xab07, 0x4)
ioctl$NBD_DO_IT(r1, 0xab03)
ioctl$NBD_CLEAR_SOCK(r1, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
r0 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r0}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
r1 = syz_open_dev$ndb(0x0, 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_SET_SIZE_BLOCKS(r1, 0xab07, 0x4)
ioctl$NBD_DO_IT(r1, 0xab03)
ioctl$NBD_CLEAR_SOCK(r1, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
testing program (duration=58.686702042s, {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}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
detailed listing:
executing program 0:
r0 = gettid()
timer_create(0x0, &(0x7f0000533fa0)={0x0, 0x21, 0x800000000004, @tid=r0}, &(0x7f0000bbdffc))
timer_settime(0x0, 0x0, &(0x7f0000000280)={{0x0, 0x3938700}, {0x0, 0x3938700}}, 0x0)
r1 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x2)
socketpair$nbd(0x1, 0x1, 0x0, 0x0)
ioctl$NBD_SET_SOCK(r1, 0xab00, 0xffffffffffffffff)
ioctl$NBD_SET_SIZE_BLOCKS(r1, 0xab07, 0x4)
ioctl$NBD_DO_IT(r1, 0xab03)
ioctl$NBD_CLEAR_SOCK(r1, 0xab04)
splice(0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x4ffe6, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=58.686702042s, {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}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
program crashed: WARNING: refcount bug in bt_tags_iter
simplifying C reproducer
testing compiled C program (duration=58.686702042s, {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}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
program did not crash
testing compiled C program (duration=58.686702042s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
program did not crash
testing compiled C program (duration=58.686702042s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
program did not crash
testing compiled C program (duration=58.686702042s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
program crashed: WARNING: refcount bug in bt_tags_iter
testing compiled C program (duration=58.686702042s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
program crashed: WARNING: refcount bug in bt_tags_iter
testing compiled C program (duration=58.686702042s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
program crashed: WARNING: refcount bug in blk_done_softirq
testing compiled C program (duration=58.686702042s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
program crashed: WARNING: refcount bug in blk_mq_dispatch_rq_list
testing compiled C program (duration=58.686702042s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-timer_create-timer_settime-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_SET_SIZE_BLOCKS-ioctl$NBD_DO_IT-ioctl$NBD_CLEAR_SOCK-splice
program crashed: WARNING: refcount bug in blk_mq_dispatch_rq_list
reproducing took 42m19.345077508s
repro crashed as (corrupted=false):
Buffer I/O error on dev nbd4, logical block 0, async page read
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 4739 at lib/refcount.c:28 refcount_warn_saturate+0x14e/0x1a0 lib/refcount.c:28
Modules linked in:

CPU: 0 PID: 4739 Comm: kworker/0:2H Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: kblockd blk_mq_run_work_fn

RIP: 0010:refcount_warn_saturate+0x14e/0x1a0 lib/refcount.c:28
Code: 09 01 48 c7 c7 c0 b5 f9 8a e8 2e 42 38 fd 0f 0b eb 8d e8 85 a8 6c fd c6 05 cb 10 e3 09 01 48 c7 c7 20 b6 f9 8a e8 12 42 38 fd <0f> 0b e9 6e ff ff ff e8 66 a8 6c fd c6 05 ad 10 e3 09 01 48 c7 c7
RSP: 0018:ffffc90003f7f788 EFLAGS: 00010246

RAX: 0c35e3aff4926b00 RBX: 0000000000000003 RCX: ffff888078993b80
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: ffffffff8166aa8c R09: ffffed10171c4f24
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88802120a000
R13: dffffc0000000000 R14: ffffc90003f7fa20 R15: ffff88802136fc00
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbcd60abd58 CR3: 000000007443e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 blk_mq_end_request block/blk-mq.c:577 [inline]
 blk_mq_dispatch_rq_list+0xc47/0x1f30 block/blk-mq.c:1408
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:200 [inline]
 blk_mq_do_dispatch_sched+0x755/0xd50 block/blk-mq-sched.c:214
 __blk_mq_sched_dispatch_requests+0x39b/0x490
 blk_mq_sched_dispatch_requests+0xf3/0x1b0 block/blk-mq-sched.c:366
 __blk_mq_run_hw_queue+0x11a/0x1b0 block/blk-mq.c:1511
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

final repro crashed as (corrupted=false):
Buffer I/O error on dev nbd4, logical block 0, async page read
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 4739 at lib/refcount.c:28 refcount_warn_saturate+0x14e/0x1a0 lib/refcount.c:28
Modules linked in:

CPU: 0 PID: 4739 Comm: kworker/0:2H Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: kblockd blk_mq_run_work_fn

RIP: 0010:refcount_warn_saturate+0x14e/0x1a0 lib/refcount.c:28
Code: 09 01 48 c7 c7 c0 b5 f9 8a e8 2e 42 38 fd 0f 0b eb 8d e8 85 a8 6c fd c6 05 cb 10 e3 09 01 48 c7 c7 20 b6 f9 8a e8 12 42 38 fd <0f> 0b e9 6e ff ff ff e8 66 a8 6c fd c6 05 ad 10 e3 09 01 48 c7 c7
RSP: 0018:ffffc90003f7f788 EFLAGS: 00010246

RAX: 0c35e3aff4926b00 RBX: 0000000000000003 RCX: ffff888078993b80
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: ffffffff8166aa8c R09: ffffed10171c4f24
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88802120a000
R13: dffffc0000000000 R14: ffffc90003f7fa20 R15: ffff88802136fc00
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbcd60abd58 CR3: 000000007443e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 blk_mq_end_request block/blk-mq.c:577 [inline]
 blk_mq_dispatch_rq_list+0xc47/0x1f30 block/blk-mq.c:1408
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:200 [inline]
 blk_mq_do_dispatch_sched+0x755/0xd50 block/blk-mq-sched.c:214
 __blk_mq_sched_dispatch_requests+0x39b/0x490
 blk_mq_sched_dispatch_requests+0xf3/0x1b0 block/blk-mq-sched.c:366
 __blk_mq_run_hw_queue+0x11a/0x1b0 block/blk-mq.c:1511
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>