Extracting prog: 1m52.947769773s
Minimizing prog: 3m31.145679802s
Simplifying prog options: 3m18.008353168s
Extracting C: 1m2.841528836s
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:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x5, 0x2d, &(0x7f00000005c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b000100000000090400000190f19c000905f3ede8e9384088477da5163aeacac5aef6b35899848f884763144ec6a2aeada635e54cdc8fb569daf4797849ac735823c41a718ab016b0c1ec7613250780", @ANYRESHEX=0x0, @ANYRESDEC=0x0, @ANYRESHEX, @ANYRES32, @ANYRES8=0x0], 0x0)

program crashed: BUG: corrupted list in em28xx_init_extension
single: successfully extracted reproducer
found reproducer with 1 syscalls
minimizing guilty program
testing program (duration=45.460082958s, {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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x5, 0x2d, 0x0, 0x0)

program did not crash
testing program (duration=45.460082958s, {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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x5, 0x2d, &(0x7f00000005c0)=ANY=[], 0x0)

program did not crash
testing program (duration=45.460082958s, {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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x5, 0x2d, &(0x7f00000005c0)=ANY=[@ANYBLOB, @ANYRESHEX=0x0, @ANYRESDEC=0x0, @ANYRESHEX, @ANYRES32, @ANYRES8=0x0], 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=45.460082958s, {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}}): syz_usb_connect
program crashed: BUG: corrupted list in em28xx_close_extension
a never seen crash title: BUG: corrupted list in em28xx_close_extension, ignore
simplifying guilty program options
testing program (duration=45.460082958s, {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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x5, 0x2d, &(0x7f00000005c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b000100000000090400000190f19c000905f3ede8e9384088477da5163aeacac5aef6b35899848f884763144ec6a2aeada635e54cdc8fb569daf4797849ac735823c41a718ab016b0c1ec7613250780", @ANYRESHEX=0x0, @ANYRESDEC=0x0, @ANYRESHEX, @ANYRES32, @ANYRES8=0x0], 0x0)

program crashed: BUG: corrupted list in em28xx_close_extension
a never seen crash title: BUG: corrupted list in em28xx_close_extension, ignore
testing program (duration=45.460082958s, {Threaded:true 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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x5, 0x2d, &(0x7f00000005c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b000100000000090400000190f19c000905f3ede8e9384088477da5163aeacac5aef6b35899848f884763144ec6a2aeada635e54cdc8fb569daf4797849ac735823c41a718ab016b0c1ec7613250780", @ANYRESHEX=0x0, @ANYRESDEC=0x0, @ANYRESHEX, @ANYRES32, @ANYRES8=0x0], 0x0)

program did not crash
testing program (duration=45.460082958s, {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: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_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x5, 0x2d, &(0x7f00000005c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b000100000000090400000190f19c000905f3ede8e9384088477da5163aeacac5aef6b35899848f884763144ec6a2aeada635e54cdc8fb569daf4797849ac735823c41a718ab016b0c1ec7613250780", @ANYRESHEX=0x0, @ANYRESDEC=0x0, @ANYRESHEX, @ANYRES32, @ANYRES8=0x0], 0x0)

program crashed: KASAN: slab-use-after-free Read in em28xx_init_extension
a never seen crash title: KASAN: slab-use-after-free Read in em28xx_init_extension, ignore
testing program (duration=45.460082958s, {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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x5, 0x2d, &(0x7f00000005c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b000100000000090400000190f19c000905f3ede8e9384088477da5163aeacac5aef6b35899848f884763144ec6a2aeada635e54cdc8fb569daf4797849ac735823c41a718ab016b0c1ec7613250780", @ANYRESHEX=0x0, @ANYRESDEC=0x0, @ANYRESHEX, @ANYRES32, @ANYRES8=0x0], 0x0)

program crashed: BUG: corrupted list in em28xx_close_extension
validation run: crashed=true
testing program (duration=45.460082958s, {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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x5, 0x2d, &(0x7f00000005c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b000100000000090400000190f19c000905f3ede8e9384088477da5163aeacac5aef6b35899848f884763144ec6a2aeada635e54cdc8fb569daf4797849ac735823c41a718ab016b0c1ec7613250780", @ANYRESHEX=0x0, @ANYRESDEC=0x0, @ANYRESHEX, @ANYRES32, @ANYRES8=0x0], 0x0)

program crashed: BUG: corrupted list in em28xx_init_extension
validation run: crashed=true
testing program (duration=45.460082958s, {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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x5, 0x2d, &(0x7f00000005c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b000100000000090400000190f19c000905f3ede8e9384088477da5163aeacac5aef6b35899848f884763144ec6a2aeada635e54cdc8fb569daf4797849ac735823c41a718ab016b0c1ec7613250780", @ANYRESHEX=0x0, @ANYRESDEC=0x0, @ANYRESHEX, @ANYRES32, @ANYRES8=0x0], 0x0)

program crashed: BUG: corrupted list in em28xx_close_extension
validation run: crashed=true
reproducing took 13m22.245365441s
repro crashed as (corrupted=false):
list_del corruption. prev->next should be ffff88805b6fc250, but was ffffffff895a79da. (prev=ffff888072fd0250)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:62!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5909 Comm: kworker/0:5 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:__list_del_entry_valid_or_report+0x14a/0x1d0 lib/list_debug.c:62
Code: 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 8b 55 00 48 89 e9 48 89 de 48 c7 c7 40 17 1b 8c e8 c7 59 23 fc 90 <0f> 0b 4c 89 e7 e8 cc 75 51 fd 48 89 ea 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90004d075f8 EFLAGS: 00010282
RAX: 000000000000006d RBX: ffff88805b6fc250 RCX: 0000000000000000
RDX: 000000000000006d RSI: ffffffff81e7cae9 RDI: fffff520009a0eb0
RBP: ffff888072fd0250 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: ffff8880566c0250
R13: ffff88805b6fc000 R14: ffffffff9007e9a8 R15: ffffed100b6dfc6f
FS:  0000000000000000(0000) GS:ffff88812433f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd749585dc0 CR3: 0000000059b4c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del include/linux/list.h:237 [inline]
 em28xx_close_extension+0x10b/0x2b0 drivers/media/usb/em28xx/em28xx-core.c:1137
 em28xx_usb_disconnect.cold+0x13d/0x253 drivers/media/usb/em28xx/em28xx-cards.c:4197
 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:633 [inline]
 device_remove+0x12a/0x180 drivers/base/dd.c:625
 __device_release_driver drivers/base/dd.c:1344 [inline]
 device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1367
 bus_remove_device+0x2bc/0x560 drivers/base/bus.c:657
 device_del+0x376/0x9b0 drivers/base/core.c:3880
 usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1476
 usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2345
 hub_port_connect drivers/usb/core/hub.c:5407 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x1d0c/0x4af0 drivers/usb/core/hub.c:5953
 process_one_work+0xa23/0x19a0 kernel/workqueue.c:3276
 process_scheduled_works kernel/workqueue.c:3359 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3440
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x14a/0x1d0 lib/list_debug.c:62
Code: 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 8b 55 00 48 89 e9 48 89 de 48 c7 c7 40 17 1b 8c e8 c7 59 23 fc 90 <0f> 0b 4c 89 e7 e8 cc 75 51 fd 48 89 ea 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90004d075f8 EFLAGS: 00010282

RAX: 000000000000006d RBX: ffff88805b6fc250 RCX: 0000000000000000
RDX: 000000000000006d RSI: ffffffff81e7cae9 RDI: fffff520009a0eb0
RBP: ffff888072fd0250 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: ffff8880566c0250
R13: ffff88805b6fc000 R14: ffffffff9007e9a8 R15: ffffed100b6dfc6f
FS:  0000000000000000(0000) GS:ffff88812433f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560fcf48c0c8 CR3: 000000002bc1b000 CR4: 00000000003526f0

final repro crashed as (corrupted=false):
list_del corruption. prev->next should be ffff88805b6fc250, but was ffffffff895a79da. (prev=ffff888072fd0250)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:62!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5909 Comm: kworker/0:5 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:__list_del_entry_valid_or_report+0x14a/0x1d0 lib/list_debug.c:62
Code: 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 8b 55 00 48 89 e9 48 89 de 48 c7 c7 40 17 1b 8c e8 c7 59 23 fc 90 <0f> 0b 4c 89 e7 e8 cc 75 51 fd 48 89 ea 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90004d075f8 EFLAGS: 00010282
RAX: 000000000000006d RBX: ffff88805b6fc250 RCX: 0000000000000000
RDX: 000000000000006d RSI: ffffffff81e7cae9 RDI: fffff520009a0eb0
RBP: ffff888072fd0250 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: ffff8880566c0250
R13: ffff88805b6fc000 R14: ffffffff9007e9a8 R15: ffffed100b6dfc6f
FS:  0000000000000000(0000) GS:ffff88812433f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd749585dc0 CR3: 0000000059b4c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del include/linux/list.h:237 [inline]
 em28xx_close_extension+0x10b/0x2b0 drivers/media/usb/em28xx/em28xx-core.c:1137
 em28xx_usb_disconnect.cold+0x13d/0x253 drivers/media/usb/em28xx/em28xx-cards.c:4197
 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:633 [inline]
 device_remove+0x12a/0x180 drivers/base/dd.c:625
 __device_release_driver drivers/base/dd.c:1344 [inline]
 device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1367
 bus_remove_device+0x2bc/0x560 drivers/base/bus.c:657
 device_del+0x376/0x9b0 drivers/base/core.c:3880
 usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1476
 usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2345
 hub_port_connect drivers/usb/core/hub.c:5407 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x1d0c/0x4af0 drivers/usb/core/hub.c:5953
 process_one_work+0xa23/0x19a0 kernel/workqueue.c:3276
 process_scheduled_works kernel/workqueue.c:3359 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3440
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x14a/0x1d0 lib/list_debug.c:62
Code: 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 8b 55 00 48 89 e9 48 89 de 48 c7 c7 40 17 1b 8c e8 c7 59 23 fc 90 <0f> 0b 4c 89 e7 e8 cc 75 51 fd 48 89 ea 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90004d075f8 EFLAGS: 00010282

RAX: 000000000000006d RBX: ffff88805b6fc250 RCX: 0000000000000000
RDX: 000000000000006d RSI: ffffffff81e7cae9 RDI: fffff520009a0eb0
RBP: ffff888072fd0250 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: ffff8880566c0250
R13: ffff88805b6fc000 R14: ffffffff9007e9a8 R15: ffffed100b6dfc6f
FS:  0000000000000000(0000) GS:ffff88812433f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560fcf48c0c8 CR3: 000000002bc1b000 CR4: 00000000003526f0