DriverDev-Devel Archive on
 help / color / Atom feed
* WARNING: ODEBUG bug in prism2sta_disconnect_usb
@ 2020-03-23 12:40 syzbot
  0 siblings, 0 replies; only message in thread
From: syzbot @ 2020-03-23 12:40 UTC (permalink / raw)
  To: andreyknvl, devel, gregkh, linux-kernel, linux-usb, osdevtc,


syzbot found the following crash on:

HEAD commit:    e17994d1 usb: core: kcov: collect coverage from usb comple..
git tree: usb-fuzzer
console output:
kernel config:
dashboard link:
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:

------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: work_struct hint: hfa384x_usb_defer+0x0/0x430 include/linux/list.h:71
WARNING: CPU: 0 PID: 95 at lib/debugobjects.c:485 debug_print_object+0x160/0x250 lib/debugobjects.c:485
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 95 Comm: kworker/0:2 Not tainted 5.6.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xef/0x16e lib/dump_stack.c:118
 panic+0x2aa/0x6e1 kernel/panic.c:221
 __warn.cold+0x2f/0x30 kernel/panic.c:582
 report_bug+0x27b/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [inline]
 do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:267
 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:debug_print_object+0x160/0x250 lib/debugobjects.c:485
Code: dd 20 37 fc 85 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd 20 37 fc 85 48 c7 c7 60 2b fc 85 e8 98 0b 29 ff <0f> 0b 83 05 0b 3a fb 05 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89
RSP: 0018:ffff8881d58c76b0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff812972fd RDI: ffffed103ab18ec8
RBP: 0000000000000001 R08: ffff8881d58b8000 R09: fffffbfff1266e8f
R10: fffffbfff1266e8e R11: ffffffff89337477 R12: ffffffff870d8b00
R13: ffffffff8119f700 R14: ffff8881d963cd20 R15: ffff8881d35b8e38
 __debug_check_no_obj_freed lib/debugobjects.c:967 [inline]
 debug_check_no_obj_freed+0x2e1/0x445 lib/debugobjects.c:998
 slab_free_hook mm/slub.c:1441 [inline]
 slab_free_freelist_hook mm/slub.c:1477 [inline]
 slab_free mm/slub.c:3024 [inline]
 kfree+0x18a/0x300 mm/slub.c:3976
 prism2sta_disconnect_usb+0x76e/0xc30 drivers/staging/wlan-ng/prism2usb.c:209
 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:436
 __device_release_driver drivers/base/dd.c:1137 [inline]
 device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1168
 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533
 device_del+0x481/0xd30 drivers/base/core.c:2677
 usb_disable_device+0x23d/0x790 drivers/usb/core/message.c:1237
 usb_disconnect+0x293/0x900 drivers/usb/core/hub.c:2211
 hub_port_connect drivers/usb/core/hub.c:5046 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5335 [inline]
 port_event drivers/usb/core/hub.c:5481 [inline]
 hub_event+0x1a1d/0x4300 drivers/usb/core/hub.c:5563
 process_one_work+0x94b/0x1620 kernel/workqueue.c:2264
 process_scheduled_works kernel/workqueue.c:2326 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2412
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..

This bug is generated by a bot. It may contain errors.
See for more information about syzbot.
syzbot engineers can be reached at

syzbot will keep track of this bug report. See: for how to communicate with syzbot.
devel mailing list

^ permalink raw reply	[flat|nested] only message in thread

only message in thread, back to index

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-23 12:40 WARNING: ODEBUG bug in prism2sta_disconnect_usb syzbot

DriverDev-Devel Archive on

Archives are clonable:
	git clone --mirror driverdev-devel/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 driverdev-devel driverdev-devel/ \
	public-inbox-index driverdev-devel

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone