Hello, syzbot found the following issue on: HEAD commit: 4676be28 usb: xhci-mtk: use first-fit for LS/FS git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=123857c3d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=5308902274df0f54 dashboard link: https://syzkaller.appspot.com/bug?extid=3e04448a4d634f32306d Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3e04448a4d634f32306d@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: work_struct hint: service_interrupt_work+0x0/0x110 arch/x86/include/asm/bitops.h:207 WARNING: CPU: 1 PID: 7231 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Modules linked in: CPU: 1 PID: 7231 Comm: syz-executor.0 Not tainted 5.13.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 80 f2 1f 86 4c 89 ee 48 c7 c7 80 e6 1f 86 e8 44 01 8a 03 <0f> 0b 83 05 95 43 ce 06 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffc90012c3fcd8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff88811438d1c0 RSI: ffffffff812a5f73 RDI: fffff52002587f8d RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffff814b963b R11: 0000000000000000 R12: ffffffff86068800 R13: ffffffff861fecc0 R14: ffffffff811a26a0 R15: dffffc0000000000 FS: 0000000003408400(0000) GS:ffff8881f6b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055a7dd6ea998 CR3: 000000014d27d000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:987 [inline] debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1018 slab_free_hook mm/slub.c:1556 [inline] slab_free_freelist_hook+0x13b/0x1b0 mm/slub.c:1606 slab_free mm/slub.c:3166 [inline] kfree+0xdb/0x3b0 mm/slub.c:4225 wdm_release+0x288/0x370 drivers/usb/class/cdc-wdm.c:752 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x218/0x220 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x41940b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffd5a6f57a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffed RBX: 0000000000000007 RCX: 000000000041940b RDX: 0000000000570d98 RSI: 000000000b35c238 RDI: 0000000000000006 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2d32b6e4 R10: 00007ffd5a6f5890 R11: 0000000000000293 R12: 0000000000259050 R13: 00000000000003e8 R14: 000000000056bf60 R15: 00000000002587eb --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
