Extracting prog: 2m52.973641877s
Minimizing prog: 17m5.031568211s
Simplifying prog options: 3m25.161248692s
Extracting C: 1m43.103033593s
Simplifying C: 0s


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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

program crashed: WARNING: kobject bug in __scsi_remove_device
single: successfully extracted reproducer
found reproducer with 4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)

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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
write(0xffffffffffffffff, &(0x7f0000000b80)='- - -\x00', 0x5)

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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mount-openat-write
detailed listing:
executing program 0:
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, 0x0, &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', 0x0, 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, 0x0, 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, 0x0, 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80), 0x0)

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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

program did not crash
testing program (duration=1m40s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

program did not crash
validation run: crashed=false
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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

program did not crash
validation run: crashed=false
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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

program crashed: WARNING: kobject bug in __scsi_remove_device
validation run: crashed=true
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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

program crashed: WARNING: kobject bug in __scsi_remove_device
validation run: crashed=true
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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000a80)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000ac0)='./sys\x00', &(0x7f0000000b00)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000b40)='./sys/class/scsi_host/host0/scan\x00', 0x1, 0x1ea)
write(r0, &(0x7f0000000b80)='- - -\x00', 0x5)

program crashed: WARNING: kobject bug in __scsi_remove_device
validation run: crashed=true
reproducing took 31m42.977282472s
repro crashed as (corrupted=false):
------------[ cut here ]------------
kobject: '(null)' (ffff888104a68548): is not initialized, yet kobject_put() is being called.
WARNING: CPU: 1 PID: 403 at lib/kobject.c:736 kobject_put+0x8e/0x2a0 lib/kobject.c:734
Modules linked in:
CPU: 1 UID: 0 PID: 403 Comm: syz.4.19 Not tainted syzkaller #0 bcd0852b9269e5a174a9e289c8567167f3c3d1d7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:kobject_put+0x8e/0x2a0 lib/kobject.c:734
Code: 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 84 a5 43 fc 48 8b 33 48 c7 c7 a0 b2 9b 86 48 89 da e8 e2 2e 65 fb <0f> 0b eb 0f e8 e9 2f ea fb e9 9c 01 00 00 e8 df 2f ea fb 4c 8d 7b
RSP: 0018:ffffc90000e2f1f8 EFLAGS: 00010246
RAX: a8ee9fe739029500 RBX: ffff888104a68548 RCX: ffff88811629cf00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90000e2f220 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0f9f334 R12: 00000000fffffff4
R13: ffff888104a68584 R14: 1ffff1102094d0b0 R15: 0000000000000000
FS:  00007f8ed24436c0(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558e1d94e8 CR3: 0000000116c9c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 put_device+0x23/0x40 drivers/base/core.c:3800
 __scsi_remove_device+0xc4/0x3c0 drivers/scsi/scsi_sysfs.c:1501
 scsi_alloc_sdev+0x970/0xcc0 drivers/scsi/scsi_scan.c:379
 scsi_probe_and_add_lun+0x1e9/0x3e60 drivers/scsi/scsi_scan.c:1207
 __scsi_scan_target+0x1f1/0xc20 drivers/scsi/scsi_scan.c:1754
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x73/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x141/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x319/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8ed159e559
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:00007f8ed2443028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8ed1825fa0 RCX: 00007f8ed159e559
RDX: 0000000000000005 RSI: 0000200000000b80 RDI: 0000000000000003
RBP: 00007f8ed1635ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8ed1826038 R14: 00007f8ed1825fa0 R15: 00007ffda81cae88
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 403 at lib/refcount.c:28 refcount_warn_saturate+0x119/0x1c0 lib/refcount.c:28
Modules linked in:
CPU: 1 UID: 0 PID: 403 Comm: syz.4.19 Tainted: G        W          syzkaller #0 bcd0852b9269e5a174a9e289c8567167f3c3d1d7
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:refcount_warn_saturate+0x119/0x1c0 lib/refcount.c:28
Code: 05 01 48 c7 c7 80 36 52 86 e8 03 8f 52 fe 0f 0b eb da e8 0a 90 d7 fe c6 05 8e 62 b4 05 01 48 c7 c7 e0 36 52 86 e8 e7 8e 52 fe <0f> 0b eb be e8 ee 8f d7 fe c6 05 6f 62 b4 05 01 48 c7 c7 20 36 52
RSP: 0018:ffffc90000e2f1d8 EFLAGS: 00010246
RAX: a8ee9fe739029500 RBX: 0000000000000003 RCX: ffff88811629cf00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90000e2f1e8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001c5da0 R12: 0000000000000000
R13: ffff888104a68584 R14: ffff888104a68580 R15: ffff888104a68580
FS:  00007f8ed24436c0(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558e1d94e8 CR3: 0000000116c9c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 kobject_put+0x25a/0x2a0 lib/kobject.c:737
 put_device+0x23/0x40 drivers/base/core.c:3800
 __scsi_remove_device+0xc4/0x3c0 drivers/scsi/scsi_sysfs.c:1501
 scsi_alloc_sdev+0x970/0xcc0 drivers/scsi/scsi_scan.c:379
 scsi_probe_and_add_lun+0x1e9/0x3e60 drivers/scsi/scsi_scan.c:1207
 __scsi_scan_target+0x1f1/0xc20 drivers/scsi/scsi_scan.c:1754
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x73/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x141/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x319/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8ed159e559
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:00007f8ed2443028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8ed1825fa0 RCX: 00007f8ed159e559
RDX: 0000000000000005 RSI: 0000200000000b80 RDI: 0000000000000003
RBP: 00007f8ed1635ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8ed1826038 R14: 00007f8ed1825fa0 R15: 00007ffda81cae88
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
kobject: '(null)' (ffff888104a681d0): is not initialized, yet kobject_put() is being called.
WARNING: CPU: 0 PID: 403 at lib/kobject.c:736 kobject_put+0x8e/0x2a0 lib/kobject.c:734
Modules linked in:
CPU: 0 UID: 0 PID: 403 Comm: syz.4.19 Tainted: G        W          syzkaller #0 bcd0852b9269e5a174a9e289c8567167f3c3d1d7
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:kobject_put+0x8e/0x2a0 lib/kobject.c:734
Code: 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 84 a5 43 fc 48 8b 33 48 c7 c7 a0 b2 9b 86 48 89 da e8 e2 2e 65 fb <0f> 0b eb 0f e8 e9 2f ea fb e9 9c 01 00 00 e8 df 2f ea fb 4c 8d 7b
RSP: 0018:ffffc90000e2f1f8 EFLAGS: 00010246
RAX: a8ee9fe739029500 RBX: ffff888104a681d0 RCX: ffff88811629cf00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90000e2f220 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001c5da4 R12: ffffffff86635690
R13: ffff888104a6820c R14: 1ffff1102094d041 R15: 0000000000000000
FS:  00007f8ed24436c0(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f14055f0300 CR3: 0000000116c9c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 put_device+0x23/0x40 drivers/base/core.c:3800
 __scsi_remove_device+0x32d/0x3c0 drivers/scsi/scsi_sysfs.c:1527
 scsi_alloc_sdev+0x970/0xcc0 drivers/scsi/scsi_scan.c:379
 scsi_probe_and_add_lun+0x1e9/0x3e60 drivers/scsi/scsi_scan.c:1207
 __scsi_scan_target+0x1f1/0xc20 drivers/scsi/scsi_scan.c:1754
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x73/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x141/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x319/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8ed159e559
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:00007f8ed2443028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8ed1825fa0 RCX: 00007f8ed159e559
RDX: 0000000000000005 RSI: 0000200000000b80 RDI: 0000000000000003
RBP: 00007f8ed1635ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8ed1826038 R14: 00007f8ed1825fa0 R15: 00007ffda81cae88
 </TASK>
---[ end trace 0000000000000000 ]---
scsi_alloc_sdev: Allocation failure during SCSI scanning, some SCSI devices might not be configured
------------[ cut here ]------------
kernel BUG at drivers/scsi/scsi_scan.c:594!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 403 Comm: syz.4.19 Tainted: G        W          syzkaller #0 bcd0852b9269e5a174a9e289c8567167f3c3d1d7
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:scsi_target_reap+0x172/0x180 drivers/scsi/scsi_scan.c:594
Code: 81 fe e9 ef fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 46 ff ff ff 4c 89 ef e8 e8 41 81 fe e9 39 ff ff ff e8 8e cc 27 fe <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 dd cb 6b 2c 90 90 90
RSP: 0018:ffffc90000e2f7a8 EFLAGS: 00010293
RAX: ffffffff83618032 RBX: ffff8881237cc800 RCX: ffff88811629cf00
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005
RBP: ffffc90000e2f7d0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001c5ee0 R12: ffff8881237cc800
R13: ffff8881237ccbc4 R14: 1ffff110246f9978 R15: 0000000000000005
FS:  00007f8ed24436c0(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558e1d94e8 CR3: 0000000116c9c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 __scsi_scan_target+0x62c/0xc20 drivers/scsi/scsi_scan.c:1771
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x73/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x141/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x319/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8ed159e559
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:00007f8ed2443028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8ed1825fa0 RCX: 00007f8ed159e559
RDX: 0000000000000005 RSI: 0000200000000b80 RDI: 0000000000000003
RBP: 00007f8ed1635ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8ed1826038 R14: 00007f8ed1825fa0 R15: 00007ffda81cae88
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:scsi_target_reap+0x172/0x180 drivers/scsi/scsi_scan.c:594
Code: 81 fe e9 ef fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 46 ff ff ff 4c 89 ef e8 e8 41 81 fe e9 39 ff ff ff e8 8e cc 27 fe <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 dd cb 6b 2c 90 90 90
RSP: 0018:ffffc90000e2f7a8 EFLAGS: 00010293
RAX: ffffffff83618032 RBX: ffff8881237cc800 RCX: ffff88811629cf00
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005
RBP: ffffc90000e2f7d0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001c5ee0 R12: ffff8881237cc800
R13: ffff8881237ccbc4 R14: 1ffff110246f9978 R15: 0000000000000005
FS:  00007f8ed24436c0(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1405270220 CR3: 0000000116c9c000 CR4: 00000000003526b0

final repro crashed as (corrupted=false):
------------[ cut here ]------------
kobject: '(null)' (ffff888104a68548): is not initialized, yet kobject_put() is being called.
WARNING: CPU: 1 PID: 403 at lib/kobject.c:736 kobject_put+0x8e/0x2a0 lib/kobject.c:734
Modules linked in:
CPU: 1 UID: 0 PID: 403 Comm: syz.4.19 Not tainted syzkaller #0 bcd0852b9269e5a174a9e289c8567167f3c3d1d7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:kobject_put+0x8e/0x2a0 lib/kobject.c:734
Code: 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 84 a5 43 fc 48 8b 33 48 c7 c7 a0 b2 9b 86 48 89 da e8 e2 2e 65 fb <0f> 0b eb 0f e8 e9 2f ea fb e9 9c 01 00 00 e8 df 2f ea fb 4c 8d 7b
RSP: 0018:ffffc90000e2f1f8 EFLAGS: 00010246
RAX: a8ee9fe739029500 RBX: ffff888104a68548 RCX: ffff88811629cf00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90000e2f220 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0f9f334 R12: 00000000fffffff4
R13: ffff888104a68584 R14: 1ffff1102094d0b0 R15: 0000000000000000
FS:  00007f8ed24436c0(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558e1d94e8 CR3: 0000000116c9c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 put_device+0x23/0x40 drivers/base/core.c:3800
 __scsi_remove_device+0xc4/0x3c0 drivers/scsi/scsi_sysfs.c:1501
 scsi_alloc_sdev+0x970/0xcc0 drivers/scsi/scsi_scan.c:379
 scsi_probe_and_add_lun+0x1e9/0x3e60 drivers/scsi/scsi_scan.c:1207
 __scsi_scan_target+0x1f1/0xc20 drivers/scsi/scsi_scan.c:1754
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x73/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x141/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x319/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8ed159e559
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:00007f8ed2443028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8ed1825fa0 RCX: 00007f8ed159e559
RDX: 0000000000000005 RSI: 0000200000000b80 RDI: 0000000000000003
RBP: 00007f8ed1635ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8ed1826038 R14: 00007f8ed1825fa0 R15: 00007ffda81cae88
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 403 at lib/refcount.c:28 refcount_warn_saturate+0x119/0x1c0 lib/refcount.c:28
Modules linked in:
CPU: 1 UID: 0 PID: 403 Comm: syz.4.19 Tainted: G        W          syzkaller #0 bcd0852b9269e5a174a9e289c8567167f3c3d1d7
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:refcount_warn_saturate+0x119/0x1c0 lib/refcount.c:28
Code: 05 01 48 c7 c7 80 36 52 86 e8 03 8f 52 fe 0f 0b eb da e8 0a 90 d7 fe c6 05 8e 62 b4 05 01 48 c7 c7 e0 36 52 86 e8 e7 8e 52 fe <0f> 0b eb be e8 ee 8f d7 fe c6 05 6f 62 b4 05 01 48 c7 c7 20 36 52
RSP: 0018:ffffc90000e2f1d8 EFLAGS: 00010246
RAX: a8ee9fe739029500 RBX: 0000000000000003 RCX: ffff88811629cf00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90000e2f1e8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001c5da0 R12: 0000000000000000
R13: ffff888104a68584 R14: ffff888104a68580 R15: ffff888104a68580
FS:  00007f8ed24436c0(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558e1d94e8 CR3: 0000000116c9c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 kobject_put+0x25a/0x2a0 lib/kobject.c:737
 put_device+0x23/0x40 drivers/base/core.c:3800
 __scsi_remove_device+0xc4/0x3c0 drivers/scsi/scsi_sysfs.c:1501
 scsi_alloc_sdev+0x970/0xcc0 drivers/scsi/scsi_scan.c:379
 scsi_probe_and_add_lun+0x1e9/0x3e60 drivers/scsi/scsi_scan.c:1207
 __scsi_scan_target+0x1f1/0xc20 drivers/scsi/scsi_scan.c:1754
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x73/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x141/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x319/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8ed159e559
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:00007f8ed2443028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8ed1825fa0 RCX: 00007f8ed159e559
RDX: 0000000000000005 RSI: 0000200000000b80 RDI: 0000000000000003
RBP: 00007f8ed1635ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8ed1826038 R14: 00007f8ed1825fa0 R15: 00007ffda81cae88
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
kobject: '(null)' (ffff888104a681d0): is not initialized, yet kobject_put() is being called.
WARNING: CPU: 0 PID: 403 at lib/kobject.c:736 kobject_put+0x8e/0x2a0 lib/kobject.c:734
Modules linked in:
CPU: 0 UID: 0 PID: 403 Comm: syz.4.19 Tainted: G        W          syzkaller #0 bcd0852b9269e5a174a9e289c8567167f3c3d1d7
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:kobject_put+0x8e/0x2a0 lib/kobject.c:734
Code: 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 84 a5 43 fc 48 8b 33 48 c7 c7 a0 b2 9b 86 48 89 da e8 e2 2e 65 fb <0f> 0b eb 0f e8 e9 2f ea fb e9 9c 01 00 00 e8 df 2f ea fb 4c 8d 7b
RSP: 0018:ffffc90000e2f1f8 EFLAGS: 00010246
RAX: a8ee9fe739029500 RBX: ffff888104a681d0 RCX: ffff88811629cf00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90000e2f220 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001c5da4 R12: ffffffff86635690
R13: ffff888104a6820c R14: 1ffff1102094d041 R15: 0000000000000000
FS:  00007f8ed24436c0(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f14055f0300 CR3: 0000000116c9c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 put_device+0x23/0x40 drivers/base/core.c:3800
 __scsi_remove_device+0x32d/0x3c0 drivers/scsi/scsi_sysfs.c:1527
 scsi_alloc_sdev+0x970/0xcc0 drivers/scsi/scsi_scan.c:379
 scsi_probe_and_add_lun+0x1e9/0x3e60 drivers/scsi/scsi_scan.c:1207
 __scsi_scan_target+0x1f1/0xc20 drivers/scsi/scsi_scan.c:1754
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x73/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x141/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x319/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8ed159e559
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:00007f8ed2443028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8ed1825fa0 RCX: 00007f8ed159e559
RDX: 0000000000000005 RSI: 0000200000000b80 RDI: 0000000000000003
RBP: 00007f8ed1635ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8ed1826038 R14: 00007f8ed1825fa0 R15: 00007ffda81cae88
 </TASK>
---[ end trace 0000000000000000 ]---
scsi_alloc_sdev: Allocation failure during SCSI scanning, some SCSI devices might not be configured
------------[ cut here ]------------
kernel BUG at drivers/scsi/scsi_scan.c:594!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 403 Comm: syz.4.19 Tainted: G        W          syzkaller #0 bcd0852b9269e5a174a9e289c8567167f3c3d1d7
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:scsi_target_reap+0x172/0x180 drivers/scsi/scsi_scan.c:594
Code: 81 fe e9 ef fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 46 ff ff ff 4c 89 ef e8 e8 41 81 fe e9 39 ff ff ff e8 8e cc 27 fe <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 dd cb 6b 2c 90 90 90
RSP: 0018:ffffc90000e2f7a8 EFLAGS: 00010293
RAX: ffffffff83618032 RBX: ffff8881237cc800 RCX: ffff88811629cf00
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005
RBP: ffffc90000e2f7d0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001c5ee0 R12: ffff8881237cc800
R13: ffff8881237ccbc4 R14: 1ffff110246f9978 R15: 0000000000000005
FS:  00007f8ed24436c0(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558e1d94e8 CR3: 0000000116c9c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 __scsi_scan_target+0x62c/0xc20 drivers/scsi/scsi_scan.c:1771
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x73/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x141/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x319/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8ed159e559
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:00007f8ed2443028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8ed1825fa0 RCX: 00007f8ed159e559
RDX: 0000000000000005 RSI: 0000200000000b80 RDI: 0000000000000003
RBP: 00007f8ed1635ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8ed1826038 R14: 00007f8ed1825fa0 R15: 00007ffda81cae88
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:scsi_target_reap+0x172/0x180 drivers/scsi/scsi_scan.c:594
Code: 81 fe e9 ef fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 46 ff ff ff 4c 89 ef e8 e8 41 81 fe e9 39 ff ff ff e8 8e cc 27 fe <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 dd cb 6b 2c 90 90 90
RSP: 0018:ffffc90000e2f7a8 EFLAGS: 00010293
RAX: ffffffff83618032 RBX: ffff8881237cc800 RCX: ffff88811629cf00
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005
RBP: ffffc90000e2f7d0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001c5ee0 R12: ffff8881237cc800
R13: ffff8881237ccbc4 R14: 1ffff110246f9978 R15: 0000000000000005
FS:  00007f8ed24436c0(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1405270220 CR3: 0000000116c9c000 CR4: 00000000003526b0