rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=71709, q=103)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295004435-4294993933), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.1  R  running task    25816 24611   7140 0x0000400c
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:5956 [inline]
 sched_show_task.cold+0x2e2/0x343 kernel/sched/core.c:5931
 print_other_cpu_stall kernel/rcu/tree_stall.h:430 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:558 [inline]
 rcu_pending kernel/rcu/tree.c:3225 [inline]
 rcu_sched_clock_irq.cold+0xb9b/0xcfa kernel/rcu/tree.c:2296
 update_process_times+0x25/0x60 kernel/time/timer.c:1727
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1320
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x5ca/0xed0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:deref_stack_reg+0x90/0xe0 arch/x86/kernel/unwind_orc.c:356
Code: 45 31 c0 84 c0 75 30 48 b8 00 00 00 00 00 fc ff df 48 c7 04 03 00 00 00 00 44 89 c0 48 8b 4c 24 58 65 48 33 0c 25 28 00 00 00 <75> 37 48 83 c4 60 5b 5d 41 5c 41 5d c3 48 8d 74 24 20 48 89 ef e8
RSP: 0018:ffffc900000075a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: 1ffff92000000eb4 RCX: 0000000000000000
RDX: ffffc90000007ff8 RSI: ffffc900000075c0 RDI: ffffc90000007ff0
RBP: ffffffff87e016ef R08: 0000000000000001 R09: ffffffff8b6cc096
R10: 000000000015724b R11: 000000000007001f R12: ffffc90000007748
R13: dffffc0000000000 R14: ffffc90000007750 R15: ffffc90000007700
 unwind_next_frame+0xbe6/0x1df0 arch/x86/kernel/unwind_orc.c:527
 arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:49
 set_track mm/kasan/common.c:57 [inline]
 __kasan_kmalloc mm/kasan/common.c:495 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc_node mm/slab.c:3263 [inline]
 kmem_cache_alloc_node_trace+0x14b/0x790 mm/slab.c:3593
 __do_kmalloc_node mm/slab.c:3615 [inline]
 __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3630
 __kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:142
 __alloc_skb+0xef/0x5a0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1083 [inline]
 mrp_pdu_init net/802/mrp.c:300 [inline]
 mrp_pdu_append_vecattr_event+0x74e/0xf90 net/802/mrp.c:399
 mrp_attr_event+0x173/0x220 net/802/mrp.c:494
 mrp_mad_event+0x47/0x60 net/802/mrp.c:574
 mrp_join_timer+0x33/0x80 net/802/mrp.c:591
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1405
 expire_timers kernel/time/timer.c:1450 [inline]
 __run_timers kernel/time/timer.c:1774 [inline]
 __run_timers kernel/time/timer.c:1741 [inline]
 run_timer_softirq+0x623/0x1600 kernel/time/timer.c:1787
 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x192/0x1d0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0x19e/0x600 arch/x86/kernel/apic/apic.c:1140
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199
Code: c0 70 c0 94 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d ae 25 c3 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 ab 6f 7d f9 65 8b 05 ec 83 30 78 85 c0 74 02 5d
RSP: 0018:ffffc90001b272b0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff132980e RBX: ffff88804fc8c340 RCX: 1ffffffff18603d8
RDX: dffffc0000000000 RSI: ffff88804fc8cc30 RDI: ffff88804fc8cc04
RBP: ffff8880ae637980 R08: 0000000000000001 R09: fffffbfff185df33
R10: ffffffff8c2ef997 R11: fffffbfff185df32 R12: ffff8880ae637980
R13: ffff888050b78600 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3106 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3206
 context_switch kernel/sched/core.c:3370 [inline]
 __schedule+0x93f/0x1ff0 kernel/sched/core.c:4083
 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4341
 retint_kernel+0x1b/0x2b
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:151 [inline]
RIP: 0010:qlist_free_all+0xfc/0x140 mm/kasan/quarantine.c:167
Code: 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 4c 8b 70 18 e9 40 ff ff ff e8 53 9b c7 ff 48 83 3d 4b a6 e3 07 00 74 36 4c 89 ff 57 9d <0f> 1f 44 00 00 4d 85 e4 75 9e 49 c7 45 08 00 00 00 00 49 c7 45 00
RSP: 0018:ffffc90001b274c8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffff8880371e2200 RCX: 1ffffffff18603d8
RDX: 0000000000000000 RSI: ffff88804fc8cc30 RDI: 0000000000000282
RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff185df33
R10: ffffffff8c2ef997 R11: fffffbfff185df32 R12: ffff8880371da240
R13: ffffc90001b27500 R14: ffff8880aa1eb000 R15: 0000000000000282
 quarantine_reduce+0x135/0x170 mm/kasan/quarantine.c:260
 __kasan_kmalloc.constprop.0+0x97/0xd0 mm/kasan/common.c:476
 __kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:142
 __alloc_skb+0xef/0x5a0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1083 [inline]
 nlmsg_new include/net/netlink.h:888 [inline]
 genlmsg_new include/net/genetlink.h:396 [inline]
 ovs_dp_cmd_alloc_info net/openvswitch/datapath.c:1544 [inline]
 ovs_dp_cmd_del+0x2b/0x270 net/openvswitch/datapath.c:1767
 genl_family_rcv_msg_doit net/netlink/genetlink.c:673 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:718 [inline]
 genl_rcv_msg+0x627/0xdf0 net/netlink/genetlink.c:735
 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:746
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362
 ___sys_sendmsg+0x100/0x170 net/socket.c:2416
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45ca29
Code: 0d b7 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb13f387c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000500d80 RCX: 000000000045ca29
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000009fd R14: 00000000004ccd59 R15: 00007fb13f3886d4
rcu: rcu_preempt kthread starved for 10502 jiffies! g71709 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    28848    10      2 0x80004000
Call Trace:
NMI backtrace for cpu 0
CPU: 0 PID: 24611 Comm: syz-executor.1 Not tainted 5.7.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:debug_lockdep_rcu_enabled+0x7/0x90 kernel/rcu/update.c:275
Code: c0 03 38 d0 7c 04 84 d2 75 0f 8b 93 c4 08 00 00 31 c0 5b 85 d2 0f 94 c0 c3 e8 75 60 51 00 eb ea 0f 1f 00 48 c7 c0 74 99 89 8a <48> ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 c1 e9 03 83 c0
RSP: 0018:ffffc90000007708 EFLAGS: 00000246
RAX: ffffffff8a899974 RBX: 0000000000000001 RCX: ffffffff817e26b0
RDX: 0000000000000100 RSI: ffffffff817e27b7 RDI: 0000000000000004
RBP: 000000000045ca29 R08: ffff88804fc8c340 R09: ffffed1015cc7104
R10: ffff8880ae63881b R11: ffffed1015cc7103 R12: ffffc90000007800
R13: 0000000000000000 R14: ffff88804fc8c340 R15: ffff8880306a2b9f
FS:  00007fb13f388700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d621000 CR3: 000000009e734000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_read_unlock include/linux/rcupdate.h:651 [inline]
 is_bpf_text_address+0x81/0x160 kernel/bpf/core.c:706
 kernel_text_address+0x6e/0xe0 kernel/extable.c:151
 __kernel_text_address+0x9/0x30 kernel/extable.c:105
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:317 [inline]
 unwind_get_return_address+0x5a/0xa0 arch/x86/kernel/unwind_orc.c:312
 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:49
 set_track mm/kasan/common.c:57 [inline]
 __kasan_kmalloc mm/kasan/common.c:495 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc_node mm/slab.c:3263 [inline]
 kmem_cache_alloc_node+0x13c/0x760 mm/slab.c:3575
 __alloc_skb+0xba/0x5a0 net/core/skbuff.c:198
 alloc_skb include/linux/skbuff.h:1083 [inline]
 mrp_pdu_init net/802/mrp.c:300 [inline]
 mrp_pdu_append_vecattr_event+0x74e/0xf90 net/802/mrp.c:399
 mrp_attr_event+0x173/0x220 net/802/mrp.c:494
 mrp_mad_event+0x47/0x60 net/802/mrp.c:574
 mrp_join_timer+0x33/0x80 net/802/mrp.c:591
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1405
 expire_timers kernel/time/timer.c:1450 [inline]
 __run_timers kernel/time/timer.c:1774 [inline]
 __run_timers kernel/time/timer.c:1741 [inline]
 run_timer_softirq+0x623/0x1600 kernel/time/timer.c:1787
 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x192/0x1d0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0x19e/0x600 arch/x86/kernel/apic/apic.c:1140
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199
Code: c0 70 c0 94 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d ae 25 c3 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 ab 6f 7d f9 65 8b 05 ec 83 30 78 85 c0 74 02 5d
RSP: 0018:ffffc90001b272b0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff132980e RBX: ffff88804fc8c340 RCX: 1ffffffff18603d8
RDX: dffffc0000000000 RSI: ffff88804fc8cc30 RDI: ffff88804fc8cc04
RBP: ffff8880ae637980 R08: 0000000000000001 R09: fffffbfff185df33
R10: ffffffff8c2ef997 R11: fffffbfff185df32 R12: ffff8880ae637980
R13: ffff888050b78600 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3106 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3206
 context_switch kernel/sched/core.c:3370 [inline]
 __schedule+0x93f/0x1ff0 kernel/sched/core.c:4083
 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4341
 retint_kernel+0x1b/0x2b
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:151 [inline]
RIP: 0010:qlist_free_all+0xfc/0x140 mm/kasan/quarantine.c:167
Code: 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 4c 8b 70 18 e9 40 ff ff ff e8 53 9b c7 ff 48 83 3d 4b a6 e3 07 00 74 36 4c 89 ff 57 9d <0f> 1f 44 00 00 4d 85 e4 75 9e 49 c7 45 08 00 00 00 00 49 c7 45 00
RSP: 0018:ffffc90001b274c8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffff8880371e2200 RCX: 1ffffffff18603d8
RDX: 0000000000000000 RSI: ffff88804fc8cc30 RDI: 0000000000000282
RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff185df33
R10: ffffffff8c2ef997 R11: fffffbfff185df32 R12: ffff8880371da240
R13: ffffc90001b27500 R14: ffff8880aa1eb000 R15: 0000000000000282
 quarantine_reduce+0x135/0x170 mm/kasan/quarantine.c:260
 __kasan_kmalloc.constprop.0+0x97/0xd0 mm/kasan/common.c:476
 __kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:142
 __alloc_skb+0xef/0x5a0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1083 [inline]
 nlmsg_new include/net/netlink.h:888 [inline]
 genlmsg_new include/net/genetlink.h:396 [inline]
 ovs_dp_cmd_alloc_info net/openvswitch/datapath.c:1544 [inline]
 ovs_dp_cmd_del+0x2b/0x270 net/openvswitch/datapath.c:1767
 genl_family_rcv_msg_doit net/netlink/genetlink.c:673 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:718 [inline]
 genl_rcv_msg+0x627/0xdf0 net/netlink/genetlink.c:735
 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:746
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362
 ___sys_sendmsg+0x100/0x170 net/socket.c:2416
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45ca29
Code: 0d b7 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb13f387c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000500d80 RCX: 000000000045ca29
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000009fd R14: 00000000004ccd59 R15: 00007fb13f3886d4