INFO: rcu detected stall in br_multicast_group

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in br_multicast_group_expired bridge	1				4	2488d	2523d	0/29	auto-closed as invalid on 2019/05/20 09:57
linux-4.14	INFO: rcu detected stall in br_multicast_group_expired	1				1	1996d	1996d	0/1	auto-closed as invalid on 2020/07/25 13:48

rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10500 ticks this GP) idle=0da/1/0x4000000000000000 softirq=113333/113333 fqs=38 (t=10501 jiffies g=175197 q=1059) rcu: rcu_preempt kthread starved for 10422 jiffies! g175197 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:28880 pid: 11 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 schedule_timeout+0x148/0x250 kernel/time/timer.c:1878 rcu_gp_fqs_loop kernel/rcu/tree.c:1940 [inline] rcu_gp_kthread+0xbbe/0x1d70 kernel/rcu/tree.c:2113 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 NMI backtrace for cpu 1 CPU: 1 PID: 1231 Comm: syz-executor.5 Not tainted 5.11.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold+0x472/0xec3 kernel/rcu/tree.c:2580 update_process_times+0x16d/0x200 kernel/time/timer.c:1782 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:__sanitizer_cov_trace_cmp8+0xc/0x70 kernel/kcov.c:263 Code: 4c 38 f0 48 c7 44 38 e0 04 00 00 00 48 89 74 38 e8 4e 89 54 c8 20 48 89 10 c3 0f 1f 40 00 49 89 f8 bf 03 00 00 00 4c 8b 14 24 <48> 89 f1 65 48 8b 34 25 00 f0 01 00 e8 b3 f1 ff ff 84 c0 74 48 48 RSP: 0018:ffffc90000d90960 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffff888148444000 RCX: 0000000000000100 RDX: ffff8880b40b9bc0 RSI: ffff8881c8444000 RDI: 0000000000000003 RBP: ffff8881c8444000 R08: ffff888148444000 R09: ffffffff8ebda87f R10: ffffffff8132a946 R11: 0000000000000001 R12: 0000000000000000 R13: ffffffff81b4c7b2 R14: ffff888148444000 R15: 0000000000000246 __phys_addr+0x26/0x110 arch/x86/mm/physaddr.c:20 ____kasan_slab_free+0x19/0x110 include/linux/mm.h:874 kasan_slab_free include/linux/kasan.h:188 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3158 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:684 [inline] consume_skb net/core/skbuff.c:839 [inline] consume_skb+0xcf/0x160 net/core/skbuff.c:833 netlink_broadcast_filtered+0x35c/0xdc0 net/netlink/af_netlink.c:1514 netlink_broadcast net/netlink/af_netlink.c:1536 [inline] nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0x90/0x250 net/netlink/af_netlink.c:2537 br_mdb_notify+0x948/0x1210 net/bridge/br_mdb.c:608 br_multicast_host_leave net/bridge/br_multicast.c:1223 [inline] br_multicast_host_leave+0x1dd/0x230 net/bridge/br_multicast.c:1214 br_multicast_group_expired+0x12f/0x1a0 net/bridge/br_multicast.c:542 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744 __do_softirq+0x2a5/0x9f7 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 </IRQ> __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:5326 Code: 55 53 65 48 8b 1c 25 00 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 c2 46 60 f8 e8 3d 29 8b f8 fb bf 01 00 00 00 <e8> 02 d1 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 50 2e 60 RSP: 0018:ffffc90002817e38 EFLAGS: 00000206 RAX: 000000000000052d RBX: ffff8880b40b9bc0 RCX: 1ffffffff19de3b9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffffed1016817378 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff81784498 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 irqentry_exit_cond_resched kernel/entry/common.c:393 [inline] irqentry_exit_cond_resched kernel/entry/common.c:385 [inline] irqentry_exit+0x7a/0xa0 kernel/entry/common.c:423 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:__sanitizer_cov_trace_pc+0x43/0x60 kernel/kcov.c:203 Code: f0 01 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 cc 14 00 00 85 c0 74 2b 8b 82 a8 14 00 00 83 f8 02 75 20 48 8b 8a b0 14 00 00 <8b> 92 ac 14 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 07 48 89 34 c1 RSP: 0018:ffffc90002817f08 EFLAGS: 00000246 RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffc900141d1000 RDX: ffff8880b40b9bc0 RSI: ffffffff81c48ff5 RDI: 0000000000000003 RBP: ffff88801c8b2000 R08: 0000000000000000 R09: ffff88801c8b2033 R10: ffffffff81c48fd9 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000004 R14: 0000000000042000 R15: 0000000000000006 fdput include/linux/file.h:46 [inline] __do_sys_fcntl fs/fcntl.c:466 [inline] __se_sys_fcntl fs/fcntl.c:448 [inline] __x64_sys_fcntl+0x145/0x1e0 fs/fcntl.c:448 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6a22ad7c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000042000 RSI: 0000000000000004 RDI: 0000000000000006 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffd7b72455f R14: 00007f6a22ad89c0 R15: 000000000119bf8c