Extracting prog: 1m16.337516828s
Minimizing prog: 2m7.426715098s
Simplifying prog options: 0s
Extracting C: 22.45605718s
Simplifying C: 4m8.619495078s


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(0x3, 0x2d, &(0x7f00000002c0)=ANY=[@ANYBLOB="12011003faff82083910012181250102030109021b00028c4400600904b60800581e62090904"], &(0x7f00000011c0)={0x0, 0x0, 0x0, 0x0})

program crashed: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
single: successfully extracted reproducer
found reproducer with 1 syscalls
minimizing guilty program
testing program (duration=37.038418315s, {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(0x3, 0x2d, 0x0, &(0x7f00000011c0)={0x0, 0x0, 0x0, 0x0})

program did not crash
testing program (duration=37.038418315s, {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(0x3, 0x2d, &(0x7f00000002c0)=ANY=[@ANYBLOB], &(0x7f00000011c0)={0x0, 0x0, 0x0, 0x0})

program did not crash
testing program (duration=37.038418315s, {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(0x3, 0x2d, &(0x7f00000002c0)=ANY=[@ANYBLOB="12011003faff82083910012181250102030109021b00028c4400600904b60800581e62090904"], 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=37.038418315s, {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: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
simplifying C reproducer
testing compiled C program (duration=37.038418315s, {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
program crashed: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
testing compiled C program (duration=37.038418315s, {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}}): syz_usb_connect
program crashed: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
testing compiled C program (duration=37.038418315s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
program crashed: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
testing compiled C program (duration=37.038418315s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
program crashed: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
testing compiled C program (duration=37.038418315s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
program crashed: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
testing compiled C program (duration=37.038418315s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
program crashed: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
testing compiled C program (duration=37.038418315s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
program crashed: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
testing program (duration=37.038418315s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x3, 0x2d, &(0x7f00000002c0)=ANY=[@ANYBLOB="12011003faff82083910012181250102030109021b00028c4400600904b60800581e62090904"], &(0x7f00000011c0)={0x0, 0x0, 0x0, 0x0})

program crashed: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
validation run: crashed=true
testing program (duration=37.038418315s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x3, 0x2d, &(0x7f00000002c0)=ANY=[@ANYBLOB="12011003faff82083910012181250102030109021b00028c4400600904b60800581e62090904"], &(0x7f00000011c0)={0x0, 0x0, 0x0, 0x0})

program crashed: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
validation run: crashed=true
testing program (duration=37.038418315s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x3, 0x2d, &(0x7f00000002c0)=ANY=[@ANYBLOB="12011003faff82083910012181250102030109021b00028c4400600904b60800581e62090904"], &(0x7f00000011c0)={0x0, 0x0, 0x0, 0x0})

program crashed: KASAN: slab-out-of-bounds Read in usbatm_usb_disconnect
validation run: crashed=true
reproducing took 9m46.929813148s
repro crashed as (corrupted=false):
usb 5-1: [ueagle-atm] loading firmware ueagle-atm/eagleI.fw
usb 5-1: USB disconnect, device number 2
==================================================================
BUG: KASAN: slab-out-of-bounds in __mutex_lock_common kernel/locking/mutex.c:625 [inline]
BUG: KASAN: slab-out-of-bounds in __mutex_lock+0x15ca/0x1bd0 kernel/locking/mutex.c:821
Read of size 8 at addr ffff888021fa86e0 by task kworker/0:2/1360

CPU: 0 UID: 0 PID: 1360 Comm: kworker/0:2 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: usb_hub_wq hub_event
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 __mutex_lock_common kernel/locking/mutex.c:625 [inline]
 __mutex_lock+0x15ca/0x1bd0 kernel/locking/mutex.c:821
 usbatm_usb_disconnect+0x70/0x7e0 drivers/usb/atm/usbatm.c:1221
 uea_disconnect+0x279/0x2b0 drivers/usb/atm/ueagle-atm.c:2605
 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:618 [inline]
 device_remove+0x12a/0x180 drivers/base/dd.c:610
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
 bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
 device_del+0x376/0x9b0 drivers/base/core.c:3961
 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+0x1c4f/0x4a60 drivers/usb/core/hub.c:5953
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 9:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5362 [inline]
 __kmalloc_noprof+0x322/0x820 mm/slub.c:5387
 _kmalloc_noprof include/linux/slab.h:973 [inline]
 _kzalloc_noprof include/linux/slab.h:1290 [inline]
 ext4_find_extent+0x21b/0xa30 fs/ext4/extents.c:918
 ext4_ext_map_blocks+0x215/0x59a0 fs/ext4/extents.c:4286
 ext4_map_query_blocks+0x113/0x930 fs/ext4/inode.c:568
 ext4_map_blocks+0x3b4/0xd30 fs/ext4/inode.c:786
 ext4_getblk+0x5f8/0x740 fs/ext4/inode.c:992
 ext4_bread_batch+0x86/0x510 fs/ext4/inode.c:1076
 __ext4_find_entry+0x4b8/0x11e0 fs/ext4/namei.c:1601
 ext4_lookup_entry fs/ext4/namei.c:1703 [inline]
 ext4_lookup+0x53d/0x730 fs/ext4/namei.c:1769
 __lookup_slow+0x155/0x320 fs/namei.c:1919
 lookup_slow+0x50/0x70 fs/namei.c:1936
 walk_component fs/namei.c:2282 [inline]
 link_path_walk+0x1377/0x1cc0 fs/namei.c:2656
 path_openat+0x1c9/0x4280 fs/namei.c:4859
 do_file_open_root+0x2f6/0x5a0 fs/namei.c:4916
 file_open_root+0x1c6/0x3f0 fs/open.c:1355
 kernel_read_file_from_path_initns+0x189/0x260 fs/kernel_read_file.c:163
 fw_get_filesystem_firmware drivers/base/firmware_loader/main.c:549 [inline]
 _request_firmware+0x733/0x13c0 drivers/base/firmware_loader/main.c:873
 request_firmware_work_func+0xee/0x440 drivers/base/firmware_loader/main.c:1162
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 9:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2705 [inline]
 slab_free mm/slub.c:6405 [inline]
 kfree+0x22b/0x6c0 mm/slub.c:6720
 ext4_free_ext_path+0xe4/0x120 fs/ext4/extents.c:127
 ext4_ext_map_blocks+0x6a4/0x59a0 fs/ext4/extents.c:4536
 ext4_map_query_blocks+0x113/0x930 fs/ext4/inode.c:568
 ext4_map_blocks+0x3b4/0xd30 fs/ext4/inode.c:786
 ext4_getblk+0x5f8/0x740 fs/ext4/inode.c:992
 ext4_bread_batch+0x86/0x510 fs/ext4/inode.c:1076
 __ext4_find_entry+0x4b8/0x11e0 fs/ext4/namei.c:1601
 ext4_lookup_entry fs/ext4/namei.c:1703 [inline]
 ext4_lookup+0x53d/0x730 fs/ext4/namei.c:1769
 __lookup_slow+0x155/0x320 fs/namei.c:1919
 lookup_slow+0x50/0x70 fs/namei.c:1936
 walk_component fs/namei.c:2282 [inline]
 link_path_walk+0x1377/0x1cc0 fs/namei.c:2656
 path_openat+0x1c9/0x4280 fs/namei.c:4859
 do_file_open_root+0x2f6/0x5a0 fs/namei.c:4916
 file_open_root+0x1c6/0x3f0 fs/open.c:1355
 kernel_read_file_from_path_initns+0x189/0x260 fs/kernel_read_file.c:163
 fw_get_filesystem_firmware drivers/base/firmware_loader/main.c:549 [inline]
 _request_firmware+0x733/0x13c0 drivers/base/firmware_loader/main.c:873
 request_firmware_work_func+0xee/0x440 drivers/base/firmware_loader/main.c:1162
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888021fa8680
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes to the right of
 allocated 96-byte region [ffff888021fa8680, ffff888021fa86e0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21fa8
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801bc42280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800200020 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 3860334426, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3294 [inline]
 allocate_slab mm/slub.c:3408 [inline]
 new_slab+0xa2/0x650 mm/slub.c:3454
 refill_objects+0xe3/0x410 mm/slub.c:7338
 refill_sheaf mm/slub.c:2832 [inline]
 __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4703
 alloc_from_pcs mm/slub.c:4801 [inline]
 slab_alloc_node mm/slub.c:4933 [inline]
 __kmalloc_cache_noprof+0x479/0x6c0 mm/slub.c:5511
 _kmalloc_noprof include/linux/slab.h:969 [inline]
 _kzalloc_noprof include/linux/slab.h:1290 [inline]
 lookup_or_create_module_kobject kernel/params.c:759 [inline]
 lookup_or_create_module_kobject+0x76/0x1a0 kernel/params.c:749
 module_add_driver+0x23a/0x420 drivers/base/module.c:46
 bus_add_driver+0x34a/0x5b0 drivers/base/bus.c:767
 driver_register+0x1e2/0x360 drivers/base/driver.c:174
 do_one_initcall+0x11d/0x700 init/main.c:1347
 do_initcall_level init/main.c:1409 [inline]
 do_initcalls init/main.c:1425 [inline]
 do_basic_setup init/main.c:1445 [inline]
 kernel_init_freeable+0x6ea/0x7b0 init/main.c:1658
 kernel_init+0x1f/0x1e0 init/main.c:1548
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888021fa8580: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888021fa8600: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
>ffff888021fa8680: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                                       ^
 ffff888021fa8700: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
 ffff888021fa8780: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
==================================================================

final repro crashed as (corrupted=false):
usb 5-1: [ueagle-atm] loading firmware ueagle-atm/eagleI.fw
usb 5-1: USB disconnect, device number 2
==================================================================
BUG: KASAN: slab-out-of-bounds in __mutex_lock_common kernel/locking/mutex.c:625 [inline]
BUG: KASAN: slab-out-of-bounds in __mutex_lock+0x15ca/0x1bd0 kernel/locking/mutex.c:821
Read of size 8 at addr ffff888021fa86e0 by task kworker/0:2/1360

CPU: 0 UID: 0 PID: 1360 Comm: kworker/0:2 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: usb_hub_wq hub_event
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 __mutex_lock_common kernel/locking/mutex.c:625 [inline]
 __mutex_lock+0x15ca/0x1bd0 kernel/locking/mutex.c:821
 usbatm_usb_disconnect+0x70/0x7e0 drivers/usb/atm/usbatm.c:1221
 uea_disconnect+0x279/0x2b0 drivers/usb/atm/ueagle-atm.c:2605
 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:618 [inline]
 device_remove+0x12a/0x180 drivers/base/dd.c:610
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
 bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
 device_del+0x376/0x9b0 drivers/base/core.c:3961
 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+0x1c4f/0x4a60 drivers/usb/core/hub.c:5953
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 9:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5362 [inline]
 __kmalloc_noprof+0x322/0x820 mm/slub.c:5387
 _kmalloc_noprof include/linux/slab.h:973 [inline]
 _kzalloc_noprof include/linux/slab.h:1290 [inline]
 ext4_find_extent+0x21b/0xa30 fs/ext4/extents.c:918
 ext4_ext_map_blocks+0x215/0x59a0 fs/ext4/extents.c:4286
 ext4_map_query_blocks+0x113/0x930 fs/ext4/inode.c:568
 ext4_map_blocks+0x3b4/0xd30 fs/ext4/inode.c:786
 ext4_getblk+0x5f8/0x740 fs/ext4/inode.c:992
 ext4_bread_batch+0x86/0x510 fs/ext4/inode.c:1076
 __ext4_find_entry+0x4b8/0x11e0 fs/ext4/namei.c:1601
 ext4_lookup_entry fs/ext4/namei.c:1703 [inline]
 ext4_lookup+0x53d/0x730 fs/ext4/namei.c:1769
 __lookup_slow+0x155/0x320 fs/namei.c:1919
 lookup_slow+0x50/0x70 fs/namei.c:1936
 walk_component fs/namei.c:2282 [inline]
 link_path_walk+0x1377/0x1cc0 fs/namei.c:2656
 path_openat+0x1c9/0x4280 fs/namei.c:4859
 do_file_open_root+0x2f6/0x5a0 fs/namei.c:4916
 file_open_root+0x1c6/0x3f0 fs/open.c:1355
 kernel_read_file_from_path_initns+0x189/0x260 fs/kernel_read_file.c:163
 fw_get_filesystem_firmware drivers/base/firmware_loader/main.c:549 [inline]
 _request_firmware+0x733/0x13c0 drivers/base/firmware_loader/main.c:873
 request_firmware_work_func+0xee/0x440 drivers/base/firmware_loader/main.c:1162
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 9:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2705 [inline]
 slab_free mm/slub.c:6405 [inline]
 kfree+0x22b/0x6c0 mm/slub.c:6720
 ext4_free_ext_path+0xe4/0x120 fs/ext4/extents.c:127
 ext4_ext_map_blocks+0x6a4/0x59a0 fs/ext4/extents.c:4536
 ext4_map_query_blocks+0x113/0x930 fs/ext4/inode.c:568
 ext4_map_blocks+0x3b4/0xd30 fs/ext4/inode.c:786
 ext4_getblk+0x5f8/0x740 fs/ext4/inode.c:992
 ext4_bread_batch+0x86/0x510 fs/ext4/inode.c:1076
 __ext4_find_entry+0x4b8/0x11e0 fs/ext4/namei.c:1601
 ext4_lookup_entry fs/ext4/namei.c:1703 [inline]
 ext4_lookup+0x53d/0x730 fs/ext4/namei.c:1769
 __lookup_slow+0x155/0x320 fs/namei.c:1919
 lookup_slow+0x50/0x70 fs/namei.c:1936
 walk_component fs/namei.c:2282 [inline]
 link_path_walk+0x1377/0x1cc0 fs/namei.c:2656
 path_openat+0x1c9/0x4280 fs/namei.c:4859
 do_file_open_root+0x2f6/0x5a0 fs/namei.c:4916
 file_open_root+0x1c6/0x3f0 fs/open.c:1355
 kernel_read_file_from_path_initns+0x189/0x260 fs/kernel_read_file.c:163
 fw_get_filesystem_firmware drivers/base/firmware_loader/main.c:549 [inline]
 _request_firmware+0x733/0x13c0 drivers/base/firmware_loader/main.c:873
 request_firmware_work_func+0xee/0x440 drivers/base/firmware_loader/main.c:1162
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888021fa8680
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes to the right of
 allocated 96-byte region [ffff888021fa8680, ffff888021fa86e0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21fa8
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801bc42280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800200020 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 3860334426, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3294 [inline]
 allocate_slab mm/slub.c:3408 [inline]
 new_slab+0xa2/0x650 mm/slub.c:3454
 refill_objects+0xe3/0x410 mm/slub.c:7338
 refill_sheaf mm/slub.c:2832 [inline]
 __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4703
 alloc_from_pcs mm/slub.c:4801 [inline]
 slab_alloc_node mm/slub.c:4933 [inline]
 __kmalloc_cache_noprof+0x479/0x6c0 mm/slub.c:5511
 _kmalloc_noprof include/linux/slab.h:969 [inline]
 _kzalloc_noprof include/linux/slab.h:1290 [inline]
 lookup_or_create_module_kobject kernel/params.c:759 [inline]
 lookup_or_create_module_kobject+0x76/0x1a0 kernel/params.c:749
 module_add_driver+0x23a/0x420 drivers/base/module.c:46
 bus_add_driver+0x34a/0x5b0 drivers/base/bus.c:767
 driver_register+0x1e2/0x360 drivers/base/driver.c:174
 do_one_initcall+0x11d/0x700 init/main.c:1347
 do_initcall_level init/main.c:1409 [inline]
 do_initcalls init/main.c:1425 [inline]
 do_basic_setup init/main.c:1445 [inline]
 kernel_init_freeable+0x6ea/0x7b0 init/main.c:1658
 kernel_init+0x1f/0x1e0 init/main.c:1548
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888021fa8580: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888021fa8600: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
>ffff888021fa8680: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                                       ^
 ffff888021fa8700: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
 ffff888021fa8780: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
==================================================================