Extracting prog: 3m12.681565757s
Minimizing prog: 6m42.553078449s
Simplifying prog options: 4m33.556851293s
Extracting C: 1m6.552176172s
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:false 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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x2d, &(0x7f00000009c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b0001f6000000090400000190f19c000905f3ed8295091f8fee2efe39472f1ea3227d052d7556c97a470fa22bee95e09780953cc585369ad5511fb3243191c3"], 0x0)

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:none SandboxArg:0 Leak:false NetInjection:false 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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x2d, &(0x7f00000009c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b0001f6000000090400000190f19c000905f3ed8295091f8fee2efe39472f1ea3227d052d7556c97a470fa22bee95e09780953cc585369ad5511fb3243191c3"], 0x0)

program crashed: BUG: corrupted list in em28xx_close_extension
single: successfully extracted reproducer
found reproducer with 1 syscalls
minimizing guilty program
testing program (duration=1m56.342672362s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x2d, 0x0, 0x0)

program did not crash
testing program (duration=1m56.342672362s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x2d, &(0x7f00000009c0)=ANY=[@ANYBLOB], 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=1m56.342672362s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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}}): syz_usb_connect
program did not crash
simplifying guilty program options
testing program (duration=1m56.342672362s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x2d, &(0x7f00000009c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b0001f6000000090400000190f19c000905f3ed8295091f8fee2efe39472f1ea3227d052d7556c97a470fa22bee95e09780953cc585369ad5511fb3243191c3"], 0x0)

program crashed: BUG: corrupted list in em28xx_close_extension
extracting C reproducer
testing compiled C program (duration=1m56.342672362s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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}}): syz_usb_connect
program crashed: KASAN: use-after-free Read in em28xx_close_extension
a never seen crash title: KASAN: use-after-free Read in em28xx_close_extension, ignore
testing program (duration=1m56.342672362s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x2d, &(0x7f00000009c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b0001f6000000090400000190f19c000905f3ed8295091f8fee2efe39472f1ea3227d052d7556c97a470fa22bee95e09780953cc585369ad5511fb3243191c3"], 0x0)

program crashed: KASAN: use-after-free Read in em28xx_init_extension
a never seen crash title: KASAN: use-after-free Read in em28xx_init_extension, ignore
testing program (duration=1m56.342672362s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x2d, &(0x7f00000009c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b0001f6000000090400000190f19c000905f3ed8295091f8fee2efe39472f1ea3227d052d7556c97a470fa22bee95e09780953cc585369ad5511fb3243191c3"], 0x0)

program crashed: BUG: corrupted list in em28xx_close_extension
validation run: crashed=true
testing program (duration=1m56.342672362s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x2d, &(0x7f00000009c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b0001f6000000090400000190f19c000905f3ed8295091f8fee2efe39472f1ea3227d052d7556c97a470fa22bee95e09780953cc585369ad5511fb3243191c3"], 0x0)

program crashed: KASAN: slab-out-of-bounds Read in em28xx_close_extension
validation run: crashed=true
testing program (duration=1m56.342672362s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x2d, &(0x7f00000009c0)=ANY=[@ANYBLOB="9f01000083667d1040206502d14e0102030109021b0001f6000000090400000190f19c000905f3ed8295091f8fee2efe39472f1ea3227d052d7556c97a470fa22bee95e09780953cc585369ad5511fb3243191c3"], 0x0)

program crashed: BUG: corrupted list in em28xx_close_extension
validation run: crashed=true
reproducing took 20m15.860705s
repro crashed as (corrupted=false):
em28xx 3-1:246.0: Disconnecting em28xx #3
em28xx 3-1:246.0: Disconnecting em28xx
 non-slab/vmalloc memory
list_del corruption. prev->next should be ffff888130010250, but was ffff888114cd8250. (prev=ffff888130018250)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:62!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 3001 Comm: kworker/0:2 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 cb af 87 e8 37 63 50 fe 90 <0f> 0b 4c 89 e7 e8 6c 2a 26 ff 48 89 ea 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc900017f7670 EFLAGS: 00010286
RAX: 000000000000006d RBX: ffff888130010250 RCX: 0000000000000000
RDX: 000000000000006d RSI: ffffffff81919c79 RDI: fffff520002feebf
RBP: ffff888130018250 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff888117dc4250
R13: ffff888130010000 R14: ffffffff8a772928 R15: ffffed1026002445
FS:  0000000000000000(0000) GS:ffff8882686ce000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc19f88ff0 CR3: 0000000115cfc000 CR4: 00000000003506f0
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:573 [inline]
 device_remove+0x12a/0x180 drivers/base/dd.c:565
 __device_release_driver drivers/base/dd.c:1284 [inline]
 device_release_driver_internal+0x42e/0x600 drivers/base/dd.c:1307
 bus_remove_device+0x22f/0x440 drivers/base/bus.c:616
 device_del+0x376/0x9b0 drivers/base/core.c:3878
 usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1478
 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+0x6c3/0xcb0 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 cb af 87 e8 37 63 50 fe 90 <0f> 0b 4c 89 e7 e8 6c 2a 26 ff 48 89 ea 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc900017f7670 EFLAGS: 00010286
RAX: 000000000000006d RBX: ffff888130010250 RCX: 0000000000000000
RDX: 000000000000006d RSI: ffffffff81919c79 RDI: fffff520002feebf
RBP: ffff888130018250 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff888117dc4250
R13: ffff888130010000 R14: ffffffff8a772928 R15: ffffed1026002445
FS:  0000000000000000(0000) GS:ffff8882686ce000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc19f88ff0 CR3: 0000000115cfc000 CR4: 00000000003506f0

final repro crashed as (corrupted=false):
em28xx 3-1:246.0: Disconnecting em28xx #3
em28xx 3-1:246.0: Disconnecting em28xx
 non-slab/vmalloc memory
list_del corruption. prev->next should be ffff888130010250, but was ffff888114cd8250. (prev=ffff888130018250)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:62!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 3001 Comm: kworker/0:2 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 cb af 87 e8 37 63 50 fe 90 <0f> 0b 4c 89 e7 e8 6c 2a 26 ff 48 89 ea 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc900017f7670 EFLAGS: 00010286
RAX: 000000000000006d RBX: ffff888130010250 RCX: 0000000000000000
RDX: 000000000000006d RSI: ffffffff81919c79 RDI: fffff520002feebf
RBP: ffff888130018250 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff888117dc4250
R13: ffff888130010000 R14: ffffffff8a772928 R15: ffffed1026002445
FS:  0000000000000000(0000) GS:ffff8882686ce000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc19f88ff0 CR3: 0000000115cfc000 CR4: 00000000003506f0
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:573 [inline]
 device_remove+0x12a/0x180 drivers/base/dd.c:565
 __device_release_driver drivers/base/dd.c:1284 [inline]
 device_release_driver_internal+0x42e/0x600 drivers/base/dd.c:1307
 bus_remove_device+0x22f/0x440 drivers/base/bus.c:616
 device_del+0x376/0x9b0 drivers/base/core.c:3878
 usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1478
 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+0x6c3/0xcb0 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 cb af 87 e8 37 63 50 fe 90 <0f> 0b 4c 89 e7 e8 6c 2a 26 ff 48 89 ea 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc900017f7670 EFLAGS: 00010286
RAX: 000000000000006d RBX: ffff888130010250 RCX: 0000000000000000
RDX: 000000000000006d RSI: ffffffff81919c79 RDI: fffff520002feebf
RBP: ffff888130018250 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff888117dc4250
R13: ffff888130010000 R14: ffffffff8a772928 R15: ffffed1026002445
FS:  0000000000000000(0000) GS:ffff8882686ce000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc19f88ff0 CR3: 0000000115cfc000 CR4: 00000000003506f0