rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=8689, q=1396 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10477 (4294962469-4294951992), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10477 jiffies! g8689 f0x2 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:28056 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14ef/0x4fb0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:6960
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x1560 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:2285
 kthread+0x726/0x8b0 kernel/kthread.c:463
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6141 Comm: syz.5.29 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:asm_sysvec_apic_timer_interrupt+0x0/0x20 arch/x86/include/asm/idtentry.h:697
Code: b6 a3 78 0a e9 61 06 00 00 90 f3 0f 1e fa 0f 1f 00 fc 6a ff e8 11 05 00 00 48 89 c4 48 89 e7 e8 c6 a2 78 0a e9 41 06 00 00 90 <f3> 0f 1e fa 0f 1f 00 fc 6a ff e8 f1 04 00 00 48 89 c4 48 89 e7 e8
RSP: 0018:ffffc90000007138 EFLAGS: 00000097
RAX: ffffffff8a489790 RBX: ffffc90000007220 RCX: 0000000000000100
RDX: ffff88810c081d40 RSI: 0000000000000002 RDI: 0000000000000003
RBP: ffffc90000007290 R08: 000000001caaaaaa R09: 1ffff92000000e44
R10: dffffc0000000000 R11: fffff52000000e45 R12: 00000000b4daa7fd
R13: 1ffff110224969c7 R14: 0000000000000002 R15: 00000000d62ce906
FS:  00007f0262ffe6c0(0000) GS:ffff88818e328000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e463fff CR3: 000000001ad00000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
RIP: 0010:jhash2+0x17c/0x2f0 include/linux/jhash.h:125
Code: 00 fc ff df e9 28 ff ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 33 ff ff ff e8 f0 9e e1 f7 e9 29 ff ff ff e8 16 ff 79 f7 eb 0b <e8> 0f ff 79 f7 45 89 e5 44 89 e5 44 89 f7 48 c7 c6 d0 87 8f 8f e8
RSP: 0018:ffffc90000007168 EFLAGS: 00000297
 rht_key_get_hash include/linux/rhashtable.h:142 [inline]
 rht_key_hashfn include/linux/rhashtable.h:159 [inline]
 __rhashtable_lookup include/linux/rhashtable.h:628 [inline]
 rhashtable_lookup include/linux/rhashtable.h:670 [inline]
 fdb_find_rcu+0x1a5/0x770 net/bridge/br_fdb.c:216
 br_fdb_update+0x10e/0x690 net/bridge/br_fdb.c:994
 br_handle_frame_finish+0x573/0x1b40 net/bridge/br_input.c:144
 br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
 br_nf_pre_routing_finish_ipv6+0xa3a/0xd70 net/bridge/br_netfilter_ipv6.c:-1
 NF_HOOK include/linux/netfilter.h:318 [inline]
 br_nf_pre_routing_ipv6+0x374/0x6f0 net/bridge/br_netfilter_ipv6.c:184
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
 br_handle_frame+0x989/0x1520 net/bridge/br_input.c:442
 __netif_receive_skb_core+0x98f/0x30a0 net/core/dev.c:6026
 __netif_receive_skb_one_core net/core/dev.c:6137 [inline]
 __netif_receive_skb+0x72/0x370 net/core/dev.c:6252
 process_backlog+0x54e/0x1340 net/core/dev.c:6604
 __napi_poll+0xae/0x320 net/core/dev.c:7668
 napi_poll net/core/dev.c:7731 [inline]
 net_rx_action+0x696/0xe30 net/core/dev.c:7883
 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7190
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 83 f2 17 f6 e8 9e 7a 50 f6 fb bf 01 00 00 00 <e8> e3 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 24 7c 50 f6 bf 01
RSP: 0018:ffffc9000242efc0 EFLAGS: 00000202
RAX: 0000000000000d23 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8dad379b RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff8fced577 R09: 1ffffffff1f9daae
R10: dffffc0000000000 R11: fffffbfff1f9daaf R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
 irqentry_exit+0x597/0x620 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 e1 8c d9 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 cb 4d 30 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 98 e6 32
RSP: 0018:ffffc9000242f0e0 EFLAGS: 00000282
RAX: c5fee7dbaafeda00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000005a44979c RSI: ffffffff8dd3c55e RDI: ffffffff8be73f00
RBP: ffffffff81acd0ed R08: ffffffff81acd0ed R09: ffffffff8e35a3a0
R10: ffffc9000242f1f8 R11: ffffffff81ae5bd0 R12: 0000000000000002
R13: ffffffff8e35a3a0 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
 is_module_text_address+0x39/0x1e0 kernel/module/main.c:3856
 kernel_text_address+0x94/0xe0 kernel/extable.c:119
 __kernel_text_address+0xd/0x30 kernel/extable.c:79
 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385
 arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kfree+0x1be/0x650 mm/slub.c:6878
 vfree+0x353/0x400 mm/vmalloc.c:3471
 bpf_check+0x1a3cb/0x1cdd0 kernel/bpf/verifier.c:25928
 bpf_prog_load+0x1484/0x1ae0 kernel/bpf/syscall.c:3081
 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6218
 __do_sys_bpf kernel/bpf/syscall.c:6331 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6329 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6329
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f026399acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0262ffe028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f0263c15fa0 RCX: 00007f026399acb9
RDX: 0000000000000094 RSI: 00002000000005c0 RDI: 0000000000000005
RBP: 00007f0263a08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0263c16038 R14: 00007f0263c15fa0 R15: 00007ffd3d812648
 </TASK>
sched: DL replenish lagged too much
