Extracting prog: 1m12.089325182s
Minimizing prog: 39m33.260437592s
Simplifying prog options: 7m19.570836397s
Extracting C: 2m42.668269252s
Simplifying C: 0s


extracting reproducer from 20 programs
first checking the prog from the crash report
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-socket$nl_route-socket$packet-ioctl$sock_SIOCGIFINDEX-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
r2 = socket$nl_route(0x10, 0x3, 0x0)
r3 = socket$packet(0x11, 0x2, 0x300)
ioctl$sock_SIOCGIFINDEX(r3, 0x8933, &(0x7f0000000080)={'bridge_slave_0\x00', <r4=>0x0})
sendmsg$nl_route(r2, &(0x7f0000000000)={0x0, 0x0, &(0x7f0000000080)={&(0x7f00000000c0)=@bridge_delvlan={0x18, 0x70, 0x1, 0x0, 0x0, {0x7, 0x0, 0x0, r4}}, 0x18}}, 0x0)
r5 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r5, &(0x7f0000000400)={0x0, 0x0, 0x0}, 0x0)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: WARNING in add_mtd_blktrans_dev
single: successfully extracted reproducer
found reproducer with 12 syscalls
minimizing guilty program
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-socket$nl_route-socket$packet-ioctl$sock_SIOCGIFINDEX-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
r1 = socket$nl_route(0x10, 0x3, 0x0)
r2 = socket$packet(0x11, 0x2, 0x300)
ioctl$sock_SIOCGIFINDEX(r2, 0x8933, &(0x7f0000000080)={'bridge_slave_0\x00', <r3=>0x0})
sendmsg$nl_route(r1, &(0x7f0000000000)={0x0, 0x0, &(0x7f0000000080)={&(0x7f00000000c0)=@bridge_delvlan={0x18, 0x70, 0x1, 0x0, 0x0, {0x7, 0x0, 0x0, r3}}, 0x18}}, 0x0)
r4 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r4, &(0x7f0000000400)={0x0, 0x0, 0x0}, 0x0)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-socket$nl_route-socket$packet-ioctl$sock_SIOCGIFINDEX-sendmsg$nl_route-socket$nl_route-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
r2 = socket$nl_route(0x10, 0x3, 0x0)
r3 = socket$packet(0x11, 0x2, 0x300)
ioctl$sock_SIOCGIFINDEX(r3, 0x8933, &(0x7f0000000080)={'bridge_slave_0\x00', <r4=>0x0})
sendmsg$nl_route(r2, &(0x7f0000000000)={0x0, 0x0, &(0x7f0000000080)={&(0x7f00000000c0)=@bridge_delvlan={0x18, 0x70, 0x1, 0x0, 0x0, {0x7, 0x0, 0x0, r4}}, 0x18}}, 0x0)
socket$nl_route(0x10, 0x3, 0x0)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: WARNING in add_mtd_blktrans_dev
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-socket$nl_route-socket$packet-ioctl$sock_SIOCGIFINDEX-sendmsg$nl_route-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
r2 = socket$nl_route(0x10, 0x3, 0x0)
r3 = socket$packet(0x11, 0x2, 0x300)
ioctl$sock_SIOCGIFINDEX(r3, 0x8933, &(0x7f0000000080)={'bridge_slave_0\x00', <r4=>0x0})
sendmsg$nl_route(r2, &(0x7f0000000000)={0x0, 0x0, &(0x7f0000000080)={&(0x7f00000000c0)=@bridge_delvlan={0x18, 0x70, 0x1, 0x0, 0x0, {0x7, 0x0, 0x0, r4}}, 0x18}}, 0x0)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: WARNING in add_mtd_blktrans_dev
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-socket$nl_route-socket$packet-ioctl$sock_SIOCGIFINDEX-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
socket$nl_route(0x10, 0x3, 0x0)
r2 = socket$packet(0x11, 0x2, 0x300)
ioctl$sock_SIOCGIFINDEX(r2, 0x8933, &(0x7f0000000080)={'bridge_slave_0\x00'})
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: WARNING in add_mtd_blktrans_dev
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-socket$nl_route-socket$packet-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
socket$nl_route(0x10, 0x3, 0x0)
socket$packet(0x11, 0x2, 0x300)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: WARNING in add_mtd_blktrans_dev
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-socket$nl_route-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
socket$nl_route(0x10, 0x3, 0x0)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: WARNING in add_mtd_blktrans_dev
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: WARNING in add_mtd_blktrans_dev
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
ioctl$BLKPG(0xffffffffffffffff, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
r0 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r0, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
write(0xffffffffffffffff, &(0x7f0000000000)='270', 0x3)
r0 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r0, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, 0x0, &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', 0x0, 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, 0x0, 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, 0x0, 0x0)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000), 0x0)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(0x0, 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, 0x0)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, 0x0})

program did not crash
extracting C reproducer
testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
program did not crash
simplifying guilty program options
testing program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: WARNING in add_mtd_blktrans_dev
extracting C reproducer
testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
program did not crash
testing program (duration=30s, {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}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program did not crash
testing program (duration=30s, {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}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: kernel BUG in put_mtd_device
a never seen crash title: kernel BUG in put_mtd_device, ignore
testing program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: WARNING in add_mtd_blktrans_dev
validation run: crashed=true
testing program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: WARNING in add_mtd_blktrans_dev
validation run: crashed=true
testing program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write-syz_open_dev$mtd-ioctl$BLKPG
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/thread-self/fail-nth\x00', 0x2, 0x12c)
write(r0, &(0x7f0000000000)='270', 0x3)
r1 = syz_open_dev$mtd(&(0x7f0000000000), 0x0, 0x2)
ioctl$BLKPG(r1, 0x1269, &(0x7f00000000c0)={0x1, 0x0, 0x0, &(0x7f0000000100)={0x0, 0x10000, 0x1}})

program crashed: WARNING in add_mtd_blktrans_dev
validation run: crashed=true
reproducing took 54m33.381641672s
repro crashed as (corrupted=false):
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4460 at block/genhd.c:554 device_add_disk+0x8d6/0xde0 block/genhd.c:552
Modules linked in:
CPU: 0 PID: 4460 Comm: syz.3.20 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:device_add_disk+0x8d6/0xde0 block/genhd.c:554
Code: 04 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 8f 03 00 00 8b 33 48 c7 c7 40 f6 90 8c e8 b1 3d 37 00 eb 05 e8 ea 04 a6 fd <0f> 0b 41 bd 01 00 00 00 44 89 e8 48 83 c4 50 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900034ff470 EFLAGS: 00010293
RAX: ffffffff83d31e76 RBX: ffff88807d342c00 RCX: ffff888073288000
RDX: 0000000000000000 RSI: 000000000000001f RDI: 0000000000000103
RBP: 000000000000001f R08: ffff88805ca101db R09: 1ffff1100b94203b
R10: dffffc0000000000 R11: ffffed100b94203c R12: ffff8880170a8c00
R13: ffff88807d342d50 R14: dffffc0000000000 R15: ffff8880170a8c00
FS:  0000555563662500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c133aa440 CR3: 000000001f858000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 add_mtd_blktrans_dev+0xfb1/0x13f0 drivers/mtd/mtd_blkdevs.c:387
 mtdblock_add_mtd+0x186/0x240 drivers/mtd/mtdblock.c:333
 blktrans_notify_add+0x95/0xe0 drivers/mtd/mtd_blkdevs.c:464
 add_mtd_device+0xd40/0x1260 drivers/mtd/mtdcore.c:693
 mtd_add_partition+0x25d/0x420 drivers/mtd/mtdpart.c:273
 mtdchar_blkpg_ioctl+0x283/0x2b0 drivers/mtd/mtdchar.c:562
 mtdchar_ioctl+0x14cb/0x1d70 drivers/mtd/mtdchar.c:1010
 mtdchar_unlocked_ioctl+0xad/0xd0 drivers/mtd/mtdchar.c:1033
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5737976199
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:00007ffe2a3fa6c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5737bfdfa0 RCX: 00007f5737976199
RDX: 00002000000000c0 RSI: 0000000000001269 RDI: 0000000000000004
RBP: 00007f5737a0d8e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5737bfdfac R14: 00007f5737bfdfa0 R15: 00007f5737bfdfa0
 </TASK>

final repro crashed as (corrupted=false):
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4460 at block/genhd.c:554 device_add_disk+0x8d6/0xde0 block/genhd.c:552
Modules linked in:
CPU: 0 PID: 4460 Comm: syz.3.20 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:device_add_disk+0x8d6/0xde0 block/genhd.c:554
Code: 04 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 8f 03 00 00 8b 33 48 c7 c7 40 f6 90 8c e8 b1 3d 37 00 eb 05 e8 ea 04 a6 fd <0f> 0b 41 bd 01 00 00 00 44 89 e8 48 83 c4 50 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900034ff470 EFLAGS: 00010293
RAX: ffffffff83d31e76 RBX: ffff88807d342c00 RCX: ffff888073288000
RDX: 0000000000000000 RSI: 000000000000001f RDI: 0000000000000103
RBP: 000000000000001f R08: ffff88805ca101db R09: 1ffff1100b94203b
R10: dffffc0000000000 R11: ffffed100b94203c R12: ffff8880170a8c00
R13: ffff88807d342d50 R14: dffffc0000000000 R15: ffff8880170a8c00
FS:  0000555563662500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c133aa440 CR3: 000000001f858000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 add_mtd_blktrans_dev+0xfb1/0x13f0 drivers/mtd/mtd_blkdevs.c:387
 mtdblock_add_mtd+0x186/0x240 drivers/mtd/mtdblock.c:333
 blktrans_notify_add+0x95/0xe0 drivers/mtd/mtd_blkdevs.c:464
 add_mtd_device+0xd40/0x1260 drivers/mtd/mtdcore.c:693
 mtd_add_partition+0x25d/0x420 drivers/mtd/mtdpart.c:273
 mtdchar_blkpg_ioctl+0x283/0x2b0 drivers/mtd/mtdchar.c:562
 mtdchar_ioctl+0x14cb/0x1d70 drivers/mtd/mtdchar.c:1010
 mtdchar_unlocked_ioctl+0xad/0xd0 drivers/mtd/mtdchar.c:1033
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5737976199
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:00007ffe2a3fa6c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5737bfdfa0 RCX: 00007f5737976199
RDX: 00002000000000c0 RSI: 0000000000001269 RDI: 0000000000000004
RBP: 00007f5737a0d8e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5737bfdfac R14: 00007f5737bfdfa0 R15: 00007f5737bfdfa0
 </TASK>