Extracting prog: 1m8.935438542s
Minimizing prog: 5m48.769076167s
Simplifying prog options: 0s
Extracting C: 21.536010522s
Simplifying C: 3m56.717777772s


extracting reproducer from 53 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: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$comedi-ioctl$COMEDI_DEVCONFIG-openat$btrfs_control-socket$inet6-setsockopt$sock_int-ioctl$COMEDI_DEVCONFIG
detailed listing:
executing program 0:
r0 = openat$comedi(0xffffffffffffff9c, &(0x7f0000000080)='/dev/comedi3\x00', 0x400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, 0x0)
openat$btrfs_control(0xffffffffffffff9c, &(0x7f0000000000), 0x8140, 0x0)
r1 = socket$inet6(0xa, 0x2, 0x0)
setsockopt$sock_int(r1, 0x1, 0xe, &(0x7f0000001600)=0x4, 0x4)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, &(0x7f00000000c0)={'c6xdigio\x00', [0x2, 0x7ff, 0x1, 0x0, 0x0, 0xcca, 0x8, 0x7, 0xa, 0xfc, 0x2, 0x1, 0x8, 0x4, 0x9, 0xffffffff, 0x1, 0x1a449, 0x3, 0x40000003, 0x100, 0x2, 0xf27, 0x6, 0xb, 0xa, 0x5, 0x8, 0x4, 0x10000, 0x6]})

program crashed: WARNING in driver_unregister
single: successfully extracted reproducer
found reproducer with 6 syscalls
minimizing guilty program
testing program (duration=31.913502607s, {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$comedi-ioctl$COMEDI_DEVCONFIG-openat$btrfs_control-socket$inet6-setsockopt$sock_int
detailed listing:
executing program 0:
r0 = openat$comedi(0xffffffffffffff9c, &(0x7f0000000080)='/dev/comedi3\x00', 0x400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, 0x0)
openat$btrfs_control(0xffffffffffffff9c, &(0x7f0000000000), 0x8140, 0x0)
r1 = socket$inet6(0xa, 0x2, 0x0)
setsockopt$sock_int(r1, 0x1, 0xe, &(0x7f0000001600)=0x4, 0x4)

program did not crash
testing program (duration=31.913502607s, {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$comedi-ioctl$COMEDI_DEVCONFIG-openat$btrfs_control-socket$inet6-ioctl$COMEDI_DEVCONFIG
detailed listing:
executing program 0:
r0 = openat$comedi(0xffffffffffffff9c, &(0x7f0000000080)='/dev/comedi3\x00', 0x400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, 0x0)
openat$btrfs_control(0xffffffffffffff9c, &(0x7f0000000000), 0x8140, 0x0)
socket$inet6(0xa, 0x2, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, &(0x7f00000000c0)={'c6xdigio\x00', [0x2, 0x7ff, 0x1, 0x0, 0x0, 0xcca, 0x8, 0x7, 0xa, 0xfc, 0x2, 0x1, 0x8, 0x4, 0x9, 0xffffffff, 0x1, 0x1a449, 0x3, 0x40000003, 0x100, 0x2, 0xf27, 0x6, 0xb, 0xa, 0x5, 0x8, 0x4, 0x10000, 0x6]})

program crashed: WARNING in driver_unregister
testing program (duration=31.913502607s, {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$comedi-ioctl$COMEDI_DEVCONFIG-openat$btrfs_control-ioctl$COMEDI_DEVCONFIG
detailed listing:
executing program 0:
r0 = openat$comedi(0xffffffffffffff9c, &(0x7f0000000080)='/dev/comedi3\x00', 0x400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, 0x0)
openat$btrfs_control(0xffffffffffffff9c, &(0x7f0000000000), 0x8140, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, &(0x7f00000000c0)={'c6xdigio\x00', [0x2, 0x7ff, 0x1, 0x0, 0x0, 0xcca, 0x8, 0x7, 0xa, 0xfc, 0x2, 0x1, 0x8, 0x4, 0x9, 0xffffffff, 0x1, 0x1a449, 0x3, 0x40000003, 0x100, 0x2, 0xf27, 0x6, 0xb, 0xa, 0x5, 0x8, 0x4, 0x10000, 0x6]})

program crashed: WARNING in driver_unregister
testing program (duration=31.913502607s, {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$comedi-ioctl$COMEDI_DEVCONFIG-ioctl$COMEDI_DEVCONFIG
detailed listing:
executing program 0:
r0 = openat$comedi(0xffffffffffffff9c, &(0x7f0000000080)='/dev/comedi3\x00', 0x400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, &(0x7f00000000c0)={'c6xdigio\x00', [0x2, 0x7ff, 0x1, 0x0, 0x0, 0xcca, 0x8, 0x7, 0xa, 0xfc, 0x2, 0x1, 0x8, 0x4, 0x9, 0xffffffff, 0x1, 0x1a449, 0x3, 0x40000003, 0x100, 0x2, 0xf27, 0x6, 0xb, 0xa, 0x5, 0x8, 0x4, 0x10000, 0x6]})

program crashed: WARNING in driver_unregister
testing program (duration=31.913502607s, {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$comedi-ioctl$COMEDI_DEVCONFIG
detailed listing:
executing program 0:
r0 = openat$comedi(0xffffffffffffff9c, &(0x7f0000000080)='/dev/comedi3\x00', 0x400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, &(0x7f00000000c0)={'c6xdigio\x00', [0x2, 0x7ff, 0x1, 0x0, 0x0, 0xcca, 0x8, 0x7, 0xa, 0xfc, 0x2, 0x1, 0x8, 0x4, 0x9, 0xffffffff, 0x1, 0x1a449, 0x3, 0x40000003, 0x100, 0x2, 0xf27, 0x6, 0xb, 0xa, 0x5, 0x8, 0x4, 0x10000, 0x6]})

program crashed: WARNING in driver_unregister
testing program (duration=31.913502607s, {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}}): ioctl$COMEDI_DEVCONFIG
detailed listing:
executing program 0:
ioctl$COMEDI_DEVCONFIG(0xffffffffffffffff, 0x40946400, &(0x7f00000000c0)={'c6xdigio\x00', [0x2, 0x7ff, 0x1, 0x0, 0x0, 0xcca, 0x8, 0x7, 0xa, 0xfc, 0x2, 0x1, 0x8, 0x4, 0x9, 0xffffffff, 0x1, 0x1a449, 0x3, 0x40000003, 0x100, 0x2, 0xf27, 0x6, 0xb, 0xa, 0x5, 0x8, 0x4, 0x10000, 0x6]})

program did not crash
testing program (duration=31.913502607s, {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$comedi-ioctl$COMEDI_DEVCONFIG
detailed listing:
executing program 0:
r0 = openat$comedi(0xffffffffffffff9c, 0x0, 0x400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, &(0x7f00000000c0)={'c6xdigio\x00', [0x2, 0x7ff, 0x1, 0x0, 0x0, 0xcca, 0x8, 0x7, 0xa, 0xfc, 0x2, 0x1, 0x8, 0x4, 0x9, 0xffffffff, 0x1, 0x1a449, 0x3, 0x40000003, 0x100, 0x2, 0xf27, 0x6, 0xb, 0xa, 0x5, 0x8, 0x4, 0x10000, 0x6]})

program did not crash
testing program (duration=31.913502607s, {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$comedi-ioctl$COMEDI_DEVCONFIG
detailed listing:
executing program 0:
r0 = openat$comedi(0xffffffffffffff9c, &(0x7f0000000080)='/dev/comedi3\x00', 0x400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=31.913502607s, {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$comedi-ioctl$COMEDI_DEVCONFIG
program crashed: WARNING in driver_unregister
simplifying C reproducer
testing compiled C program (duration=31.913502607s, {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$comedi-ioctl$COMEDI_DEVCONFIG
program crashed: WARNING in driver_unregister
testing compiled C program (duration=31.913502607s, {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}}): openat$comedi-ioctl$COMEDI_DEVCONFIG
program crashed: WARNING in driver_unregister
testing compiled C program (duration=31.913502607s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$comedi-ioctl$COMEDI_DEVCONFIG
program crashed: WARNING in driver_unregister
testing compiled C program (duration=31.913502607s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$comedi-ioctl$COMEDI_DEVCONFIG
program crashed: WARNING in driver_unregister
testing compiled C program (duration=31.913502607s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$comedi-ioctl$COMEDI_DEVCONFIG
program crashed: WARNING in driver_unregister
testing compiled C program (duration=31.913502607s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$comedi-ioctl$COMEDI_DEVCONFIG
program crashed: WARNING in driver_unregister
testing compiled C program (duration=31.913502607s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$comedi-ioctl$COMEDI_DEVCONFIG
program crashed: WARNING in driver_unregister
testing program (duration=31.913502607s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$comedi-ioctl$COMEDI_DEVCONFIG
detailed listing:
executing program 0:
r0 = openat$comedi(0xffffffffffffff9c, &(0x7f0000000080)='/dev/comedi3\x00', 0x400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, &(0x7f00000000c0)={'c6xdigio\x00', [0x2, 0x7ff, 0x1, 0x0, 0x0, 0xcca, 0x8, 0x7, 0xa, 0xfc, 0x2, 0x1, 0x8, 0x4, 0x9, 0xffffffff, 0x1, 0x1a449, 0x3, 0x40000003, 0x100, 0x2, 0xf27, 0x6, 0xb, 0xa, 0x5, 0x8, 0x4, 0x10000, 0x6]})

program crashed: WARNING in driver_unregister
validation run: crashed=true
testing program (duration=31.913502607s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$comedi-ioctl$COMEDI_DEVCONFIG
detailed listing:
executing program 0:
r0 = openat$comedi(0xffffffffffffff9c, &(0x7f0000000080)='/dev/comedi3\x00', 0x400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, &(0x7f00000000c0)={'c6xdigio\x00', [0x2, 0x7ff, 0x1, 0x0, 0x0, 0xcca, 0x8, 0x7, 0xa, 0xfc, 0x2, 0x1, 0x8, 0x4, 0x9, 0xffffffff, 0x1, 0x1a449, 0x3, 0x40000003, 0x100, 0x2, 0xf27, 0x6, 0xb, 0xa, 0x5, 0x8, 0x4, 0x10000, 0x6]})

program crashed: WARNING in driver_unregister
validation run: crashed=true
testing program (duration=31.913502607s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$comedi-ioctl$COMEDI_DEVCONFIG
detailed listing:
executing program 0:
r0 = openat$comedi(0xffffffffffffff9c, &(0x7f0000000080)='/dev/comedi3\x00', 0x400, 0x0)
ioctl$COMEDI_DEVCONFIG(r0, 0x40946400, &(0x7f00000000c0)={'c6xdigio\x00', [0x2, 0x7ff, 0x1, 0x0, 0x0, 0xcca, 0x8, 0x7, 0xa, 0xfc, 0x2, 0x1, 0x8, 0x4, 0x9, 0xffffffff, 0x1, 0x1a449, 0x3, 0x40000003, 0x100, 0x2, 0xf27, 0x6, 0xb, 0xa, 0x5, 0x8, 0x4, 0x10000, 0x6]})

program crashed: WARNING in driver_unregister
validation run: crashed=true
reproducing took 13m1.629892598s
repro crashed as (corrupted=false):
------------[ cut here ]------------
Unexpected driver unregister!
WARNING: CPU: 0 PID: 6094 at drivers/base/driver.c:273 driver_unregister drivers/base/driver.c:273 [inline]
WARNING: CPU: 0 PID: 6094 at drivers/base/driver.c:273 driver_unregister+0x90/0xb0 drivers/base/driver.c:270
Modules linked in:
CPU: 0 UID: 0 PID: 6094 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:driver_unregister drivers/base/driver.c:273 [inline]
RIP: 0010:driver_unregister+0x90/0xb0 drivers/base/driver.c:270
Code: 48 89 ef e8 22 ac 89 fc 48 89 df e8 3a 93 ff ff 5b 5d e9 93 0b e0 fb e8 8e 0b e0 fb 90 48 c7 c7 20 8a 1e 8c e8 e1 3e 9e fb 90 <0f> 0b 90 90 5b 5d e9 75 0b e0 fb e8 20 af 48 fc eb 94 e8 19 af 48
RSP: 0018:ffffc90003de79a0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffff8ff11060 RCX: ffffffff817b1cd8
RDX: ffff88802afc8000 RSI: ffffffff817b1ce5 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8ff10fa0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888022797000
FS:  0000555556317500(0000) GS:ffff8880d6a05000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e763fff CR3: 00000000312a4000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 comedi_device_detach_locked+0x12f/0xa50 drivers/comedi/drivers.c:207
 comedi_device_detach+0x67/0xb0 drivers/comedi/drivers.c:215
 comedi_device_attach+0x43d/0x900 drivers/comedi/drivers.c:1011
 do_devconfig_ioctl+0x1b1/0x710 drivers/comedi/comedi_fops.c:872
 comedi_unlocked_ioctl+0x165d/0x2f00 drivers/comedi/comedi_fops.c:2178
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7391d8f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff77ea0be8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7391fe5fa0 RCX: 00007f7391d8f7c9
RDX: 00002000000000c0 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007f7391e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7391fe5fa0 R14: 00007f7391fe5fa0 R15: 0000000000000003
 </TASK>

final repro crashed as (corrupted=false):
------------[ cut here ]------------
Unexpected driver unregister!
WARNING: CPU: 0 PID: 6094 at drivers/base/driver.c:273 driver_unregister drivers/base/driver.c:273 [inline]
WARNING: CPU: 0 PID: 6094 at drivers/base/driver.c:273 driver_unregister+0x90/0xb0 drivers/base/driver.c:270
Modules linked in:
CPU: 0 UID: 0 PID: 6094 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:driver_unregister drivers/base/driver.c:273 [inline]
RIP: 0010:driver_unregister+0x90/0xb0 drivers/base/driver.c:270
Code: 48 89 ef e8 22 ac 89 fc 48 89 df e8 3a 93 ff ff 5b 5d e9 93 0b e0 fb e8 8e 0b e0 fb 90 48 c7 c7 20 8a 1e 8c e8 e1 3e 9e fb 90 <0f> 0b 90 90 5b 5d e9 75 0b e0 fb e8 20 af 48 fc eb 94 e8 19 af 48
RSP: 0018:ffffc90003de79a0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffff8ff11060 RCX: ffffffff817b1cd8
RDX: ffff88802afc8000 RSI: ffffffff817b1ce5 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8ff10fa0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888022797000
FS:  0000555556317500(0000) GS:ffff8880d6a05000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e763fff CR3: 00000000312a4000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 comedi_device_detach_locked+0x12f/0xa50 drivers/comedi/drivers.c:207
 comedi_device_detach+0x67/0xb0 drivers/comedi/drivers.c:215
 comedi_device_attach+0x43d/0x900 drivers/comedi/drivers.c:1011
 do_devconfig_ioctl+0x1b1/0x710 drivers/comedi/comedi_fops.c:872
 comedi_unlocked_ioctl+0x165d/0x2f00 drivers/comedi/comedi_fops.c:2178
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7391d8f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff77ea0be8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7391fe5fa0 RCX: 00007f7391d8f7c9
RDX: 00002000000000c0 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007f7391e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7391fe5fa0 R14: 00007f7391fe5fa0 R15: 0000000000000003
 </TASK>