WARNING: refcount bug in route4

Title	Replies (including bot)	Last reply
WARNING: refcount bug in route4_destroy	0 (1)	2020/03/24 07:40

------------[ cut here ]------------ refcount_t: saturated; leaking memory. WARNING: CPU: 1 PID: 26742 at lib/refcount.c:19 refcount_warn_saturate+0xf4/0x1e0 lib/refcount.c:19 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 26742 Comm: kworker/u4:3 Not tainted 5.6.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net 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:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [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:refcount_warn_saturate+0xf4/0x1e0 lib/refcount.c:19 Code: 1d 24 4d d2 06 31 ff 89 de e8 e8 47 e3 fd 84 db 75 ab e8 af 46 e3 fd 48 c7 c7 00 a9 51 88 c6 05 04 4d d2 06 01 e8 94 57 b5 fd <0f> 0b eb 8f e8 93 46 e3 fd 0f b6 1d ee 4c d2 06 31 ff 89 de e8 b3 RSP: 0018:ffffc90004667628 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815c06c1 RDI: fffff520008cceb7 RBP: 0000000000000000 R08: ffff88808f87a100 R09: fffffbfff180e578 R10: fffffbfff180e577 R11: ffffffff8c072bbf R12: ffff88809fca7004 R13: 00000000ffff8801 R14: dffffc0000000000 R15: ffff88809fca7000 refcount_add_not_zero include/linux/refcount.h:165 [inline] refcount_inc_not_zero include/linux/refcount.h:211 [inline] maybe_get_net include/net/net_namespace.h:252 [inline] tcf_exts_get_net include/net/pkt_cls.h:227 [inline] route4_destroy+0x534/0x800 net/sched/cls_route.c:298 tcf_proto_destroy+0x6e/0x310 net/sched/cls_api.c:296 tcf_proto_put+0x8c/0xc0 net/sched/cls_api.c:308 tcf_chain_flush+0x266/0x390 net/sched/cls_api.c:600 tcf_block_flush_all_chains net/sched/cls_api.c:1052 [inline] __tcf_block_put+0x1a4/0x540 net/sched/cls_api.c:1214 tcf_block_put_ext net/sched/cls_api.c:1414 [inline] tcf_block_put+0xb3/0x100 net/sched/cls_api.c:1429 hfsc_destroy_qdisc+0xe0/0x280 net/sched/sch_hfsc.c:1501 qdisc_destroy+0x118/0x690 net/sched/sch_generic.c:958 qdisc_put+0xcd/0xe0 net/sched/sch_generic.c:985 dev_shutdown+0x2b5/0x486 net/sched/sch_generic.c:1311 rollback_registered_many+0x603/0xe70 net/core/dev.c:8803 unregister_netdevice_many.part.0+0x16/0x1e0 net/core/dev.c:9966 unregister_netdevice_many net/core/dev.c:9965 [inline] default_device_exit_batch+0x311/0x3d0 net/core/dev.c:10442 ops_exit_list.isra.0+0x103/0x150 net/core/net_namespace.c:175 cleanup_net+0x511/0xa50 net/core/net_namespace.c:589 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..