------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: work_struct hint: smc_ib_port_event_work+0x0/0x330 include/linux/workqueue.h:568 WARNING: CPU: 0 PID: 23 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: 23 Comm: kworker/u4:2 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound ib_unregister_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x27b/0x2f0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:175 [inline] fixup_bug arch/x86/kernel/traps.c:170 [inline] do_error_trap+0x12b/0x220 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 00 25 72 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd 00 25 72 88 48 c7 c7 60 1a 72 88 e8 48 06 b1 fd <0f> 0b 83 05 bb f8 f2 06 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89 RSP: 0018:ffffc90000e07b38 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815c4e91 RDI: fffff520001c0f59 RBP: 0000000000000001 R08: ffff8880a903e600 R09: ffffed1015cc45c9 R10: ffffed1015cc45c8 R11: ffff8880ae622e43 R12: ffffffff8997bf00 R13: ffffffff814ac650 R14: ffff88808fb8bd58 R15: ffff8880944ce310 __debug_check_no_obj_freed lib/debugobjects.c:967 [inline] debug_check_no_obj_freed+0x2e1/0x445 lib/debugobjects.c:998 kfree+0xf6/0x2b0 mm/slab.c:3756 smc_ib_remove_dev+0x1e3/0x310 net/smc/smc_ib.c:603 remove_client_context+0xbe/0x110 drivers/infiniband/core/device.c:724 disable_device+0x13b/0x230 drivers/infiniband/core/device.c:1268 __ib_unregister_device+0x91/0x180 drivers/infiniband/core/device.c:1435 ib_unregister_work+0x15/0x30 drivers/infiniband/core/device.c:1545 process_one_work+0x94b/0x1690 kernel/workqueue.c:2266 worker_thread+0x96/0xe20 kernel/workqueue.c:2412 kthread+0x357/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..