Hello, syzbot found the following crash on: HEAD commit: 61a09258 Merge tag 'for-linus' of git://git.kernel.org/pub.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10a6d70de00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7aef917d2e37d731 dashboard link: https://syzkaller.appspot.com/bug?extid=c3b8c2a85d37162cc6ab compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) 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: Reported-by: syzbot+c3b8c2a85d37162cc6ab@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: work_struct hint: smc_ib_port_event_work+0x0/0x340 net/smc/smc_ib.c:523 WARNING: CPU: 0 PID: 298 at lib/debugobjects.c:488 debug_print_object lib/debugobjects.c:485 [inline] WARNING: CPU: 0 PID: 298 at lib/debugobjects.c:488 __debug_check_no_obj_freed lib/debugobjects.c:967 [inline] WARNING: CPU: 0 PID: 298 at lib/debugobjects.c:488 debug_check_no_obj_freed+0x45c/0x640 lib/debugobjects.c:998 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 298 Comm: kworker/u4:5 Not tainted 5.6.0-rc4-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+0x1e9/0x30e lib/dump_stack.c:118 panic+0x264/0x7a0 kernel/panic.c:221 __warn+0x209/0x210 kernel/panic.c:582 report_bug+0x1ac/0x2d0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0xca/0x1c0 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 lib/debugobjects.c:485 [inline] RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:967 [inline] RIP: 0010:debug_check_no_obj_freed+0x45c/0x640 lib/debugobjects.c:998 Code: 74 08 4c 89 f7 e8 64 26 18 fe 4d 8b 06 48 c7 c7 13 08 d1 88 48 c7 c6 cf f8 ce 88 48 89 da 89 e9 4d 89 f9 31 c0 e8 14 c0 ae fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df ff 05 56 28 b1 05 48 8b 5c 24 RSP: 0018:ffffc90001e07b78 EFLAGS: 00010046 RAX: 4ee5a22e59a59c00 RBX: ffffffff88d4e56a RCX: ffff8880a8a14440 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff815e16e6 R09: ffffed1015d04592 R10: ffffed1015d04592 R11: 0000000000000000 R12: ffff88809325f864 R13: ffffffff8b558e00 R14: ffffffff890d13a0 R15: ffffffff87bf6590 kfree+0xfc/0x220 mm/slab.c:3756 remove_client_context+0xb3/0x1e0 drivers/infiniband/core/device.c:724 disable_device+0xec/0x2e0 drivers/infiniband/core/device.c:1268 __ib_unregister_device+0x6c/0x160 drivers/infiniband/core/device.c:1435 ib_unregister_work+0x15/0x30 drivers/infiniband/core/device.c:1545 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2264 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2410 kthread+0x317/0x340 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 https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
