Extracting prog: 3m29.898268128s
Minimizing prog: 15m34.694296646s
Simplifying prog options: 12m11.474994618s
Extracting C: 2m16.044636748s
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:5 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

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:5 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program crashed: WARNING in hci_conn_timeout
single: successfully extracted reproducer
found reproducer with 3 syscalls
minimizing guilty program
testing program (duration=1m27.95225168s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)

program did not crash
testing program (duration=1m27.95225168s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program did not crash
testing program (duration=1m27.95225168s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program did not crash
testing program (duration=1m27.95225168s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, 0x0, 0x0)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program did not crash
testing program (duration=1m27.95225168s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(0x0, 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program did not crash
testing program (duration=1m27.95225168s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program did not crash
testing program (duration=1m27.95225168s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(0x0, 0xa)

program did not crash
testing program (duration=1m27.95225168s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB], 0xa)

program did not crash
extracting C reproducer
testing compiled C program (duration=1m27.95225168s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
program crashed: WARNING in corrupted
a never seen crash title: WARNING in corrupted, ignore
simplifying guilty program options
testing program (duration=1m27.95225168s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program crashed: WARNING in hci_conn_timeout
extracting C reproducer
testing compiled C program (duration=1m27.95225168s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
program crashed: WARNING in corrupted
a never seen crash title: WARNING in corrupted, ignore
testing program (duration=1m27.95225168s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program crashed: WARNING in hci_conn_timeout
extracting C reproducer
testing compiled C program (duration=1m27.95225168s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:namespace 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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
program did not crash
testing program (duration=1m27.95225168s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program crashed: WARNING in hci_conn_timeout
extracting C reproducer
testing compiled C program (duration=1m27.95225168s, {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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
program did not crash
testing program (duration=1m27.95225168s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program crashed: WARNING in hci_conn_timeout
validation run: crashed=true
testing program (duration=1m27.95225168s, {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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program did not crash
validation run: crashed=false
testing program (duration=1m27.95225168s, {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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program crashed: WARNING in hci_conn_timeout
validation run: crashed=true
testing program (duration=1m27.95225168s, {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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program did not crash
validation run: crashed=false
testing program (duration=1m27.95225168s, {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}}): bpf$MAP_CREATE-syz_emit_vhci-syz_emit_vhci
detailed listing:
executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x5, 0x3, 0x3800, 0x7, 0x11}, 0x48)
syz_emit_vhci(&(0x7f0000000540)=ANY=[@ANYBLOB="043e1f0a"], 0x22)
syz_emit_vhci(&(0x7f0000000000)=ANY=[@ANYBLOB="040e079c0814"], 0xa)

program crashed: WARNING in hci_conn_timeout
validation run: crashed=true
reproducing took 40m17.663084878s
repro crashed as (corrupted=false):
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
kobject: kobject_add_internal failed for hci0:0 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci0: failed to register connection device
------------[ cut here ]------------
refcnt < 0
WARNING: net/bluetooth/hci_conn.c:641 at hci_conn_timeout+0xff/0x2c0 net/bluetooth/hci_conn.c:641, CPU#0: kworker/u9:0/52
Modules linked in:
CPU: 0 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: hci0 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0xff/0x2c0 net/bluetooth/hci_conn.c:641
Code: 48 89 df e8 33 f5 09 00 eb 07 e8 3c 0f f0 f6 b0 13 0f b6 f0 48 89 df 5b 41 5c 41 5e 41 5f 5d e9 d7 9f fe ff e8 22 0f f0 f6 90 <0f> 0b 90 eb 8c 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 31 ff ff ff
RSP: 0000:ffffc90000bd7ab0 EFLAGS: 00010293
RAX: ffffffff8ad7bb6e RBX: ffff888078194000 RCX: ffff88801b151f40
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff888078194013 R09: 1ffff1100f032802
R10: dffffc0000000000 R11: ffffed100f032803 R12: dffffc0000000000
R13: ffffffff818f9aba R14: ffff888078194a50 R15: ffff888078194010
FS:  0000000000000000(0000) GS:ffff888124cd2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f7143200 CR3: 000000000eb48000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

final repro crashed as (corrupted=false):
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
kobject: kobject_add_internal failed for hci0:0 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci0: failed to register connection device
------------[ cut here ]------------
refcnt < 0
WARNING: net/bluetooth/hci_conn.c:641 at hci_conn_timeout+0xff/0x2c0 net/bluetooth/hci_conn.c:641, CPU#0: kworker/u9:0/52
Modules linked in:
CPU: 0 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: hci0 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0xff/0x2c0 net/bluetooth/hci_conn.c:641
Code: 48 89 df e8 33 f5 09 00 eb 07 e8 3c 0f f0 f6 b0 13 0f b6 f0 48 89 df 5b 41 5c 41 5e 41 5f 5d e9 d7 9f fe ff e8 22 0f f0 f6 90 <0f> 0b 90 eb 8c 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 31 ff ff ff
RSP: 0000:ffffc90000bd7ab0 EFLAGS: 00010293
RAX: ffffffff8ad7bb6e RBX: ffff888078194000 RCX: ffff88801b151f40
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff888078194013 R09: 1ffff1100f032802
R10: dffffc0000000000 R11: ffffed100f032803 R12: dffffc0000000000
R13: ffffffff818f9aba R14: ffff888078194a50 R15: ffff888078194010
FS:  0000000000000000(0000) GS:ffff888124cd2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f7143200 CR3: 000000000eb48000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>