rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6340
rcu: 	(detected by 1, t=10502 jiffies, g=11397, q=470 ncpus=2)
task:syz.1.110       state:R  running task     stack:22248 pid:6340  ppid:5780   flags:0x0000400a
Call Trace:
 <IRQ>
 sched_show_task+0x49b/0x5c0 kernel/sched/core.c:9180
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:261 [inline]
 print_other_cpu_stall+0xfb8/0x1340 kernel/rcu/tree_stall.h:637
 check_cpu_stall kernel/rcu/tree_stall.h:809 [inline]
 rcu_pending kernel/rcu/tree.c:3950 [inline]
 rcu_sched_clock_irq+0x890/0x1230 kernel/rcu/tree.c:2295
 update_process_times+0x147/0x1b0 kernel/time/timer.c:2072
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x3a2/0x580 kernel/time/tick-sched.c:1492
 __run_hrtimer kernel/time/hrtimer.c:1754 [inline]
 __hrtimer_run_queues+0x4e8/0xc10 kernel/time/hrtimer.c:1818
 hrtimer_interrupt+0x39d/0x980 kernel/time/hrtimer.c:1880
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:unwind_next_frame+0x1c31/0x2990 arch/x86/kernel/unwind_orc.c:-1
Code: f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 8c a2 a4 00 4d 89 37 49 bf 00 00 00 00 00 fc ff df <48> 8b 44 24 18 42 0f b6 04 38 84 c0 48 8b 5c 24 60 0f 85 a1 0a 00
RSP: 0018:ffffc900001efdd8 EFLAGS: 00000246
RAX: ffffffff813bcb5e RBX: ffffffff8ff25479 RCX: ffff888027d73c00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffffc90018a57010
RBP: ffffc900001efef8 R08: ffff888027d73c00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc90018a56f10
R13: ffffc900001efea8 R14: ffffffff8ff25478 R15: dffffc0000000000
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
 slab_alloc_node mm/slub.c:3495 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
 skb_clone+0x1eb/0x370 net/core/skbuff.c:1915
 packet_rcv+0x5a9/0x1360 net/packet/af_packet.c:2239
 deliver_skb net/core/dev.c:2282 [inline]
 dev_queue_xmit_nit+0x5d5/0xba0 net/core/dev.c:2352
 xmit_one net/core/dev.c:3646 [inline]
 dev_hard_start_xmit+0x150/0x790 net/core/dev.c:3666
 __dev_queue_xmit+0x1be8/0x37e0 net/core/dev.c:4479
 neigh_output include/net/neighbour.h:547 [inline]
 ip6_finish_output2+0xf7a/0x1690 net/ipv6/ip6_output.c:143
 dst_output include/net/dst.h:470 [inline]
 NF_HOOK include/linux/netfilter.h:304 [inline]
 ndisc_send_skb+0xbb9/0x1480 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x36b/0x640 net/ipv6/addrconf.c:4043
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x17/0x60 kernel/kcov.c:212
Code: 48 8b 3d 7c cc e4 0d 48 89 de 5b e9 73 10 58 00 cc cc cc f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 40 27 7c 7e 65 8b 15 41 27 7c 7e <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 24 16 00 00
RSP: 0018:ffffc90018a56b28 EFLAGS: 00000297
RAX: ffffffff81af99c4 RBX: 0000000000000001 RCX: ffff888027d73c00
RDX: 0000000080000002 RSI: 0000000000000001 RDI: 0000000000000008
RBP: 0000000000000001 R08: ffffffff8f6c5aef R09: 1ffffffff1ed8b5d
R10: dffffc0000000000 R11: fffffbfff1ed8b5e R12: ffffe8ffffd56050
R13: dffffc0000000000 R14: ffffc90018a56c00 R15: ffffc90018a56c20
 perf_swevent_get_recursion_context+0x34/0x150 kernel/events/core.c:9977
 perf_trace_buf_alloc+0x59/0x290 kernel/trace/trace_event_perf.c:410
 perf_trace_lock+0x19d/0x3b0 include/trace/events/lock.h:50
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x866/0x8c0 kernel/locking/lockdep.c:5801
 rcu_lock_release include/linux/rcupdate.h:344 [inline]
 rcu_read_unlock include/linux/rcupdate.h:819 [inline]
 trace_call_bpf+0x5dd/0x6c0 kernel/trace/bpf_trace.c:145
 perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10295
 perf_trace_lock+0x303/0x3b0 include/trace/events/lock.h:50
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x866/0x8c0 kernel/locking/lockdep.c:5801
 rcu_lock_release include/linux/rcupdate.h:344 [inline]
 rcu_read_unlock include/linux/rcupdate.h:819 [inline]
 is_bpf_text_address+0x28f/0x2a0 kernel/bpf/core.c:744
 kernel_text_address+0xa0/0xd0 kernel/extable.c:125
 __kernel_text_address+0xd/0x30 kernel/extable.c:79
 unwind_get_return_address+0x5d/0xc0 arch/x86/kernel/unwind_orc.c:369
 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
 kmalloc include/linux/slab.h:600 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 sctp_add_bind_addr+0x8c/0x360 net/sctp/bind_addr.c:150
 sctp_copy_local_addr_list+0x31b/0x4e0 net/sctp/protocol.c:165
 sctp_bind_addr_copy+0xb3/0x3c0 net/sctp/bind_addr.c:56
 sctp_connect_new_asoc+0x2f9/0x6a0 net/sctp/socket.c:1095
 sctp_sendmsg_new_asoc net/sctp/socket.c:1691 [inline]
 sctp_sendmsg+0x1519/0x27b0 net/sctp/socket.c:2011
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x61b/0x980 net/socket.c:2595
 ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2687 [inline]
 __se_sys_sendmsg+0x1d0/0x2c0 net/socket.c:2685
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2861d9e559
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:00007f2862baa028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f2862025fa0 RCX: 00007f2861d9e559
RDX: 0000000000000041 RSI: 0000200000001240 RDI: 000000000000000c
RBP: 00007f2861e35ad8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2862026038 R14: 00007f2862025fa0 R15: 00007ffde66a0608
 </TASK>
rcu: rcu_preempt kthread starved for 10621 jiffies! g11397 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:26664 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6701
 schedule+0xbd/0x170 kernel/sched/core.c:6775
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 6340 Comm: syz.1.110 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:unwind_next_frame+0x1c31/0x2990 arch/x86/kernel/unwind_orc.c:-1
Code: f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 8c a2 a4 00 4d 89 37 49 bf 00 00 00 00 00 fc ff df <48> 8b 44 24 18 42 0f b6 04 38 84 c0 48 8b 5c 24 60 0f 85 a1 0a 00
RSP: 0018:ffffc900001efdd8 EFLAGS: 00000246
RAX: ffffffff813bcb5e RBX: ffffffff8ff25479 RCX: ffff888027d73c00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffffc90018a57010
RBP: ffffc900001efef8 R08: ffff888027d73c00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc90018a56f10
R13: ffffc900001efea8 R14: ffffffff8ff25478 R15: dffffc0000000000
FS:  00007f2862baa6c0(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000031ed4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
 slab_alloc_node mm/slub.c:3495 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
 skb_clone+0x1eb/0x370 net/core/skbuff.c:1915
 packet_rcv+0x5a9/0x1360 net/packet/af_packet.c:2239
 deliver_skb net/core/dev.c:2282 [inline]
 dev_queue_xmit_nit+0x5d5/0xba0 net/core/dev.c:2352
 xmit_one net/core/dev.c:3646 [inline]
 dev_hard_start_xmit+0x150/0x790 net/core/dev.c:3666
 __dev_queue_xmit+0x1be8/0x37e0 net/core/dev.c:4479
 neigh_output include/net/neighbour.h:547 [inline]
 ip6_finish_output2+0xf7a/0x1690 net/ipv6/ip6_output.c:143
 dst_output include/net/dst.h:470 [inline]
 NF_HOOK include/linux/netfilter.h:304 [inline]
 ndisc_send_skb+0xbb9/0x1480 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x36b/0x640 net/ipv6/addrconf.c:4043
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x17/0x60 kernel/kcov.c:212
Code: 48 8b 3d 7c cc e4 0d 48 89 de 5b e9 73 10 58 00 cc cc cc f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 40 27 7c 7e 65 8b 15 41 27 7c 7e <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 24 16 00 00
RSP: 0018:ffffc90018a56b28 EFLAGS: 00000297
RAX: ffffffff81af99c4 RBX: 0000000000000001 RCX: ffff888027d73c00
RDX: 0000000080000002 RSI: 0000000000000001 RDI: 0000000000000008
RBP: 0000000000000001 R08: ffffffff8f6c5aef R09: 1ffffffff1ed8b5d
R10: dffffc0000000000 R11: fffffbfff1ed8b5e R12: ffffe8ffffd56050
R13: dffffc0000000000 R14: ffffc90018a56c00 R15: ffffc90018a56c20
 perf_swevent_get_recursion_context+0x34/0x150 kernel/events/core.c:9977
 perf_trace_buf_alloc+0x59/0x290 kernel/trace/trace_event_perf.c:410
 perf_trace_lock+0x19d/0x3b0 include/trace/events/lock.h:50
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x866/0x8c0 kernel/locking/lockdep.c:5801
 rcu_lock_release include/linux/rcupdate.h:344 [inline]
 rcu_read_unlock include/linux/rcupdate.h:819 [inline]
 trace_call_bpf+0x5dd/0x6c0 kernel/trace/bpf_trace.c:145
 perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10295
 perf_trace_lock+0x303/0x3b0 include/trace/events/lock.h:50
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x866/0x8c0 kernel/locking/lockdep.c:5801
 rcu_lock_release include/linux/rcupdate.h:344 [inline]
 rcu_read_unlock include/linux/rcupdate.h:819 [inline]
 is_bpf_text_address+0x28f/0x2a0 kernel/bpf/core.c:744
 kernel_text_address+0xa0/0xd0 kernel/extable.c:125
 __kernel_text_address+0xd/0x30 kernel/extable.c:79
 unwind_get_return_address+0x5d/0xc0 arch/x86/kernel/unwind_orc.c:369
 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
 kmalloc include/linux/slab.h:600 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 sctp_add_bind_addr+0x8c/0x360 net/sctp/bind_addr.c:150
 sctp_copy_local_addr_list+0x31b/0x4e0 net/sctp/protocol.c:165
 sctp_bind_addr_copy+0xb3/0x3c0 net/sctp/bind_addr.c:56
 sctp_connect_new_asoc+0x2f9/0x6a0 net/sctp/socket.c:1095
 sctp_sendmsg_new_asoc net/sctp/socket.c:1691 [inline]
 sctp_sendmsg+0x1519/0x27b0 net/sctp/socket.c:2011
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x61b/0x980 net/socket.c:2595
 ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2687 [inline]
 __se_sys_sendmsg+0x1d0/0x2c0 net/socket.c:2685
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2861d9e559
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:00007f2862baa028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f2862025fa0 RCX: 00007f2861d9e559
RDX: 0000000000000041 RSI: 0000200000001240 RDI: 000000000000000c
RBP: 00007f2861e35ad8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2862026038 R14: 00007f2862025fa0 R15: 00007ffde66a0608
 </TASK>