Extracting prog: 7m18.228780136s
Minimizing prog: 8m35.943409172s
Simplifying prog options: 17m11.912451663s
Extracting C: 5m7.435299503s
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: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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {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: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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program crashed: WARNING in kernfs_get
single: successfully extracted reproducer
found reproducer with 1 syscalls
minimizing guilty program
testing program (duration=8m29.726495367s, {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: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(0x0, 0x0, 0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=8m29.726495367s, {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: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: no output from test machine
a never seen crash title: no output from test machine, ignore
simplifying guilty program options
testing program (duration=8m29.726495367s, {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: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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program did not crash
testing program (duration=8m29.726495367s, {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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program did not crash
testing program (duration=8m29.726495367s, {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: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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program did not crash
validation run: crashed=false
testing program (duration=8m29.726495367s, {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: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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program did not crash
validation run: crashed=false
testing program (duration=8m29.726495367s, {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: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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program did not crash
validation run: crashed=false
testing program (duration=8m29.726495367s, {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: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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program did not crash
validation run: crashed=false
testing program (duration=8m29.726495367s, {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: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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program crashed: WARNING in kernfs_get
validation run: crashed=true
testing program (duration=8m29.726495367s, {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: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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program did not crash
validation run: crashed=false
testing program (duration=8m29.726495367s, {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: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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program crashed: WARNING in kernfs_get
validation run: crashed=true
testing program (duration=8m29.726495367s, {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: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(0x0, 0x24, &(0x7f0000000040)={{0x12, 0x1, 0x200, 0xa, 0x86, 0xf3, 0x40, 0x1110, 0x9024, 0xdb24, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x12, 0x1, 0x0, 0xe9, 0x50, 0x9, [{{0x9, 0x4, 0x62, 0x4, 0x0, 0x6f, 0x6f, 0x49, 0x5}}]}}]}}, 0x0)

program crashed: WARNING in kernfs_get
validation run: crashed=true
reproducing took 1h32m8.867980893s
repro crashed as (corrupted=false):
usb 8-1: Falling back to sysfs fallback for: ueagle-atm/eagleII.fw
------------[ cut here ]------------
!atomic_read(&kn->count)
WARNING: fs/kernfs/dir.c:537 at kernfs_get.part.0+0x6e/0x80 fs/kernfs/dir.c:537, CPU#0: kworker/0:28/6559
Modules linked in:
CPU: 0 UID: 0 PID: 6559 Comm: kworker/0:28 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events request_firmware_work_func
RIP: 0010:kernfs_get.part.0+0x6e/0x80 fs/kernfs/dir.c:537
Code: 28 43 50 ff 85 ed 74 1c e8 6f 48 50 ff be 04 00 00 00 48 89 df e8 02 af bc ff f0 ff 03 5b 5d e9 58 54 da 08 e8 53 48 50 ff 90 <0f> 0b 90 eb d9 48 89 df e8 15 a9 bc ff eb c0 0f 1f 00 90 90 90 90
RSP: 0018:ffffc90004f77798 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802feb7960 RCX: ffffffff82b85728
RDX: ffff88802a988000 RSI: ffffffff82b8574d RDI: ffff88802a988000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000000
R13: ffff8880222a93b0 R14: 0000000000000000 R15: ffff8880222a93a8
FS:  0000000000000000(0000) GS:ffff8880d6347000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30663fff CR3: 000000002aa9b000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 kernfs_get+0x1f/0x30 fs/kernfs/dir.c:536
 sysfs_get include/linux/sysfs.h:802 [inline]
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x359/0x930 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x16a/0x1e0 lib/kobject.c:426
 class_dir_create_and_add drivers/base/core.c:3232 [inline]
 get_device_parent+0x382/0x4c0 drivers/base/core.c:3283
 device_add+0x1ad/0x1950 drivers/base/core.c:3613
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:86 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:162 [inline]
 firmware_fallback_sysfs+0x2e2/0xc20 drivers/base/firmware_loader/fallback.c:238
 _request_firmware+0xfd7/0x13c0 drivers/base/firmware_loader/main.c:898
 request_firmware_work_func+0xea/0x250 drivers/base/firmware_loader/main.c:1150
 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
 process_scheduled_works kernel/workqueue.c:3358 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
 kthread+0x370/0x450 kernel/kthread.c:467
 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>

final repro crashed as (corrupted=false):
usb 8-1: Falling back to sysfs fallback for: ueagle-atm/eagleII.fw
------------[ cut here ]------------
!atomic_read(&kn->count)
WARNING: fs/kernfs/dir.c:537 at kernfs_get.part.0+0x6e/0x80 fs/kernfs/dir.c:537, CPU#0: kworker/0:28/6559
Modules linked in:
CPU: 0 UID: 0 PID: 6559 Comm: kworker/0:28 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events request_firmware_work_func
RIP: 0010:kernfs_get.part.0+0x6e/0x80 fs/kernfs/dir.c:537
Code: 28 43 50 ff 85 ed 74 1c e8 6f 48 50 ff be 04 00 00 00 48 89 df e8 02 af bc ff f0 ff 03 5b 5d e9 58 54 da 08 e8 53 48 50 ff 90 <0f> 0b 90 eb d9 48 89 df e8 15 a9 bc ff eb c0 0f 1f 00 90 90 90 90
RSP: 0018:ffffc90004f77798 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802feb7960 RCX: ffffffff82b85728
RDX: ffff88802a988000 RSI: ffffffff82b8574d RDI: ffff88802a988000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000000
R13: ffff8880222a93b0 R14: 0000000000000000 R15: ffff8880222a93a8
FS:  0000000000000000(0000) GS:ffff8880d6347000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30663fff CR3: 000000002aa9b000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 kernfs_get+0x1f/0x30 fs/kernfs/dir.c:536
 sysfs_get include/linux/sysfs.h:802 [inline]
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x359/0x930 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x16a/0x1e0 lib/kobject.c:426
 class_dir_create_and_add drivers/base/core.c:3232 [inline]
 get_device_parent+0x382/0x4c0 drivers/base/core.c:3283
 device_add+0x1ad/0x1950 drivers/base/core.c:3613
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:86 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:162 [inline]
 firmware_fallback_sysfs+0x2e2/0xc20 drivers/base/firmware_loader/fallback.c:238
 _request_firmware+0xfd7/0x13c0 drivers/base/firmware_loader/main.c:898
 request_firmware_work_func+0xea/0x250 drivers/base/firmware_loader/main.c:1150
 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
 process_scheduled_works kernel/workqueue.c:3358 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
 kthread+0x370/0x450 kernel/kthread.c:467
 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>