bisecting fixing commit since 7d2a07b769330c34b4deabeed939325c77a7ec2f
building syzkaller on 8f58a0efbf867526a0adee8d9a5cb38e2ebf1ee4
testing commit 7d2a07b769330c34b4deabeed939325c77a7ec2f
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 24c222f351a243a31e027f40fb3fa1e4805d4da029d4e70e91a645c64f1fe075
run #0: crashed: INFO: task hung in usb_register_dev
run #1: crashed: INFO: task hung in sisusb_open
run #2: crashed: INFO: task hung in usb_register_dev
run #3: crashed: INFO: task hung in sisusb_open
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
reproducer seems to be flaky
testing current HEAD 9be9ed2612b5aedb52a2c240edb1630b6b743cb6
testing commit 9be9ed2612b5aedb52a2c240edb1630b6b743cb6
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 49cd8d27869e718840bd3e4865a66b63488d0bdd859a86b7b716b71980ad7edc
run #0: crashed: INFO: task hung in usb_register_dev
run #1: crashed: INFO: task hung in usb_register_dev
run #2: crashed: INFO: task hung in sisusb_open
run #3: crashed: INFO: task hung in usb_register_dev
run #4: crashed: WARNING: ODEBUG bug in netdev_run_todo
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
Reproducer flagged being flaky
revisions tested: 2, total time: 36m10.168962975s (build: 12m6.024287341s, test: 23m19.936673853s)
the crash still happens on HEAD
commit msg: Merge tag 'platform-drivers-x86-v5.18-4' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86
crash: WARNING: ODEBUG bug in netdev_run_todo
bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): Released all slaves
------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 include/linux/find.h:144
WARNING: CPU: 1 PID: 52 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505
Modules linked in:
CPU: 1 PID: 52 Comm: kworker/u4:2 Not tainted 5.18.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505
Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd 40 c0 42 89 4c 89 ee 48 c7 c7 40 b4 42 89 e8 0c 6b b3 04 <0f> 0b 83 05 a5 b5 2e 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffffc900013af8b0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8942afe0 RDI: fffff52000275f08
RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880b9f34147
R10: ffffed10173e6828 R11: 0000000000000001 R12: ffffffff88ed7ae0
R13: ffffffff8942b920 R14: ffffffff815cef00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb319832880 CR3: 00000000735b6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:992 [inline]
 debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1023
 slab_free_hook mm/slub.c:1703 [inline]
 slab_free_freelist_hook+0xeb/0x1c0 mm/slub.c:1754
 slab_free mm/slub.c:3510 [inline]
 kfree+0xd6/0x4d0 mm/slub.c:4552
 device_release+0x93/0x200 drivers/base/core.c:2229
 kobject_cleanup lib/kobject.c:673 [inline]
 kobject_release lib/kobject.c:704 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x139/0x410 lib/kobject.c:721
 netdev_run_todo+0x63e/0xe90 net/core/dev.c:10274
 default_device_exit_batch+0x3a4/0x4f0 net/core/dev.c:11242
 cleanup_net+0x423/0x980 net/core/net_namespace.c:594
 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289
 worker_thread+0x598/0xec0 kernel/workqueue.c:2436
 kthread+0x299/0x340 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>