Extracting prog: 3m14.288995197s
Minimizing prog: 19m31.900297845s
Simplifying prog options: 2m58.465635749s
Extracting C: 1m32.614061139s
Simplifying C: 9m4.861202512s


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:4 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}}): syz_init_net_socket$nfc_llcp-syz_init_net_socket$nfc_llcp-openat$nci-syz_init_net_socket$nl_generic-socket$netlink-writev-socket$inet6_icmp_raw-socket$inet6_udp-bind$nfc_llcp
detailed listing:
executing program 0:
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1) (async)
r0 = syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1)
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)
syz_init_net_socket$nl_generic(0x10, 0x3, 0x10)
r1 = socket$netlink(0x10, 0x3, 0x0)
writev(r1, 0x0, 0x0)
socket$inet6_icmp_raw(0xa, 0x3, 0x3a)
socket$inet6_udp(0xa, 0x2, 0x0)
bind$nfc_llcp(r0, 0x0, 0x0)

program did not crash
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:4 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}}): syz_init_net_socket$nfc_llcp-syz_init_net_socket$nfc_llcp-openat$nci-syz_init_net_socket$nl_generic-socket$netlink-writev-socket$inet6_icmp_raw-socket$inet6_udp-bind$nfc_llcp
detailed listing:
executing program 0:
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1) (async)
r0 = syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1)
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)
syz_init_net_socket$nl_generic(0x10, 0x3, 0x10)
r1 = socket$netlink(0x10, 0x3, 0x0)
writev(r1, 0x0, 0x0)
socket$inet6_icmp_raw(0xa, 0x3, 0x3a)
socket$inet6_udp(0xa, 0x2, 0x0)
bind$nfc_llcp(r0, 0x0, 0x0)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
single: successfully extracted reproducer
found reproducer with 9 syscalls
minimizing guilty program
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): syz_init_net_socket$nfc_llcp-syz_init_net_socket$nfc_llcp-openat$nci-syz_init_net_socket$nl_generic-socket$netlink-writev-socket$inet6_icmp_raw-socket$inet6_udp
detailed listing:
executing program 0:
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1) (async)
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1)
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)
syz_init_net_socket$nl_generic(0x10, 0x3, 0x10)
r0 = socket$netlink(0x10, 0x3, 0x0)
writev(r0, 0x0, 0x0)
socket$inet6_icmp_raw(0xa, 0x3, 0x3a)
socket$inet6_udp(0xa, 0x2, 0x0)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): syz_init_net_socket$nfc_llcp-syz_init_net_socket$nfc_llcp-openat$nci-syz_init_net_socket$nl_generic-socket$netlink-writev-socket$inet6_icmp_raw
detailed listing:
executing program 0:
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1) (async)
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1)
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)
syz_init_net_socket$nl_generic(0x10, 0x3, 0x10)
r0 = socket$netlink(0x10, 0x3, 0x0)
writev(r0, 0x0, 0x0)
socket$inet6_icmp_raw(0xa, 0x3, 0x3a)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): syz_init_net_socket$nfc_llcp-syz_init_net_socket$nfc_llcp-openat$nci-syz_init_net_socket$nl_generic-socket$netlink-writev
detailed listing:
executing program 0:
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1) (async)
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1)
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)
syz_init_net_socket$nl_generic(0x10, 0x3, 0x10)
r0 = socket$netlink(0x10, 0x3, 0x0)
writev(r0, 0x0, 0x0)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): syz_init_net_socket$nfc_llcp-syz_init_net_socket$nfc_llcp-openat$nci-syz_init_net_socket$nl_generic-socket$netlink
detailed listing:
executing program 0:
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1) (async)
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1)
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)
syz_init_net_socket$nl_generic(0x10, 0x3, 0x10)
socket$netlink(0x10, 0x3, 0x0)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): syz_init_net_socket$nfc_llcp-syz_init_net_socket$nfc_llcp-openat$nci-syz_init_net_socket$nl_generic
detailed listing:
executing program 0:
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1) (async)
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1)
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)
syz_init_net_socket$nl_generic(0x10, 0x3, 0x10)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): syz_init_net_socket$nfc_llcp-syz_init_net_socket$nfc_llcp-openat$nci
detailed listing:
executing program 0:
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1) (async)
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1)
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): syz_init_net_socket$nfc_llcp-syz_init_net_socket$nfc_llcp
detailed listing:
executing program 0:
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1) (async)
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1)

program did not crash
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): syz_init_net_socket$nfc_llcp-openat$nci
detailed listing:
executing program 0:
syz_init_net_socket$nfc_llcp(0x27, 0x1, 0x1) (async)
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$nci
detailed listing:
executing program 0:
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$nci
detailed listing:
executing program 0:
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0)

program did not crash
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$nci
detailed listing:
executing program 0:
openat$nci(0xffffffffffffff9c, 0x0, 0x2, 0x0) (rerun: 64)

program did not crash
extracting C reproducer
testing compiled C program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$nci
program did not crash
simplifying guilty program options
testing program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nci
detailed listing:
executing program 0:
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
extracting C reproducer
testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$nci
program crashed: BUG: MAX_LOCKDEP_KEYS too low!
simplifying C reproducer
testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nci
program did not crash
testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nci
program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nci
program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nci
program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nci
program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing compiled C program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nci
program crashed: BUG: MAX_LOCKDEP_KEYS too low!
testing program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nci
detailed listing:
executing program 0:
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
validation run: crashed=true
testing program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nci
detailed listing:
executing program 0:
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
validation run: crashed=true
testing program (duration=1m40s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nci
detailed listing:
executing program 0:
openat$nci(0xffffffffffffff9c, &(0x7f0000000080), 0x2, 0x0) (rerun: 64)

program crashed: BUG: MAX_LOCKDEP_KEYS too low!
validation run: crashed=true
reproducing took 41m22.146970739s
repro crashed as (corrupted=false):
BUG: MAX_LOCKDEP_KEYS too low!
turning off the locking correctness validator.
CPU: 3 UID: 0 PID: 21004 Comm: syz.1.94 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 register_lock_class+0x5e6/0x7b0 kernel/locking/lockdep.c:1376
 __lock_acquire+0x25d/0x1f40 kernel/locking/lockdep.c:5162
 lock_acquire kernel/locking/lockdep.c:5942 [inline]
 lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
 touch_wq_lockdep_map+0xad/0x1c0 kernel/workqueue.c:4111
 __flush_workqueue+0x131/0x1200 kernel/workqueue.c:4153
 drain_workqueue+0x175/0x3b0 kernel/workqueue.c:4317
 destroy_workqueue+0xc3/0xa30 kernel/workqueue.c:6155
 nci_unregister_device+0xb5/0x330 net/nfc/nci/core.c:1333
 virtual_ncidev_close+0x4b/0xa0 drivers/nfc/virtual_ncidev.c:168
 __fput+0x400/0xb60 fs/file_table.c:512
 fput_close_sync+0x118/0x250 fs/file_table.c:618
 filp_close_sync+0x75/0xa0 fs/open.c:1573
 close_files fs/file.c:572 [inline]
 put_files_struct fs/file.c:584 [inline]
 put_files_struct+0x1f7/0x390 fs/file.c:581
 switch_files_struct fs/file.c:598 [inline]
 exit_files+0x85/0xb0 fs/file.c:604
 do_exit+0x8c5/0x2a40 kernel/exit.c:984
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1130
 __do_sys_exit_group kernel/exit.c:1141 [inline]
 __se_sys_exit_group kernel/exit.c:1139 [inline]
 __ia32_sys_exit_group+0x3e/0x50 kernel/exit.c:1139
 ia32_sys_call+0x1a39/0x1a40 arch/x86/include/generated/asm/syscalls_32.h:253
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f92fec
Code: Unable to access opcode bytes at 0xf7f92fc2.
RSP: 002b:00000000fff0d0dc EFLAGS: 00000282 ORIG_RAX: 00000000000000fc
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 00000000ffffff9c RDI: 00000000f71b88d9
RBP: 00000000f741dff4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

final repro crashed as (corrupted=false):
BUG: MAX_LOCKDEP_KEYS too low!
turning off the locking correctness validator.
CPU: 3 UID: 0 PID: 21004 Comm: syz.1.94 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 register_lock_class+0x5e6/0x7b0 kernel/locking/lockdep.c:1376
 __lock_acquire+0x25d/0x1f40 kernel/locking/lockdep.c:5162
 lock_acquire kernel/locking/lockdep.c:5942 [inline]
 lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
 touch_wq_lockdep_map+0xad/0x1c0 kernel/workqueue.c:4111
 __flush_workqueue+0x131/0x1200 kernel/workqueue.c:4153
 drain_workqueue+0x175/0x3b0 kernel/workqueue.c:4317
 destroy_workqueue+0xc3/0xa30 kernel/workqueue.c:6155
 nci_unregister_device+0xb5/0x330 net/nfc/nci/core.c:1333
 virtual_ncidev_close+0x4b/0xa0 drivers/nfc/virtual_ncidev.c:168
 __fput+0x400/0xb60 fs/file_table.c:512
 fput_close_sync+0x118/0x250 fs/file_table.c:618
 filp_close_sync+0x75/0xa0 fs/open.c:1573
 close_files fs/file.c:572 [inline]
 put_files_struct fs/file.c:584 [inline]
 put_files_struct+0x1f7/0x390 fs/file.c:581
 switch_files_struct fs/file.c:598 [inline]
 exit_files+0x85/0xb0 fs/file.c:604
 do_exit+0x8c5/0x2a40 kernel/exit.c:984
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1130
 __do_sys_exit_group kernel/exit.c:1141 [inline]
 __se_sys_exit_group kernel/exit.c:1139 [inline]
 __ia32_sys_exit_group+0x3e/0x50 kernel/exit.c:1139
 ia32_sys_call+0x1a39/0x1a40 arch/x86/include/generated/asm/syscalls_32.h:253
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f92fec
Code: Unable to access opcode bytes at 0xf7f92fc2.
RSP: 002b:00000000fff0d0dc EFLAGS: 00000282 ORIG_RAX: 00000000000000fc
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 00000000ffffff9c RDI: 00000000f71b88d9
RBP: 00000000f741dff4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>