rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10482 ticks this GP) idle=b88c/1/0x4000000000000000 softirq=139581/139582 fqs=24
rcu: 	(t=10500 jiffies g=194705 q=785 ncpus=2)
rcu: rcu_preempt kthread starved for 10445 jiffies! g194705 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:27536 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x313/0x1590 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1796 Comm: syz.7.10380 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:127 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:178 [inline]
RIP: 0010:kasan_check_range+0x82/0x290 mm/kasan/generic.c:187
Code: 03 48 bb 01 00 00 00 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 <4c> 01 fb 41 80 3b 00 0f 85 8d 01 00 00 49 ff c3 48 ff c3 75 ee e9
RSP: 0018:ffffc900001efa20 EFLAGS: 00000002
RAX: ffffffff81aeab01 RBX: e0000eeffa29b70d RCX: ffffffff81aeabd1
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88802eb24790
RBP: ffff88802eb24790 R08: ffff88802eb24793 R09: 1ffff11005d648f2
R10: dffffc0000000000 R11: ffffed1005d648f2 R12: 0000000000000001
R13: 0000000000000001 R14: ffffed1005d648f3 R15: 1ffff11005d648f2
FS:  00007f59feeb56c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b35013ff8 CR3: 000000007a34a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
 __perf_event_overflow+0x41/0x630 kernel/events/core.c:9657
 perf_swevent_hrtimer+0x4aa/0x570 kernel/events/core.c:11188
 __run_hrtimer kernel/time/hrtimer.c:1750 [inline]
 __hrtimer_run_queues+0x4eb/0xc40 kernel/time/hrtimer.c:1814
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
 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:get_current arch/x86/include/asm/current.h:41 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x60 kernel/kcov.c:215
Code: 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 2c cd 03 0d 48 89 de 5b e9 93 57 57 00 cc cc cc f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 00 a1 7c 7e 65 8b 15 01 a1 7c 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc900001f0080 EFLAGS: 00000202
RAX: ffffffff8132a2e2 RBX: ffffc900001f0140 RCX: ffff88801eaabc00
RDX: 0000000000000100 RSI: 0000000000000302 RDI: 0000000000000000
RBP: ffffc900001f0110 R08: ffff88801eaabc00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffffff818714e0
R13: 1ffff9200003e094 R14: ffffffff8175b850 R15: ffffc900001f0088
 arch_stack_walk+0x152/0x190 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
 __call_rcu_common kernel/rcu/tree.c:2721 [inline]
 call_rcu+0x153/0x950 kernel/rcu/tree.c:2837
 refdst_drop include/net/dst.h:270 [inline]
 skb_dst_drop include/net/dst.h:282 [inline]
 __dev_queue_xmit+0x983/0x36b0 net/core/dev.c:4419
 dev_queue_xmit include/linux/netdevice.h:3113 [inline]
 neigh_hh_output include/net/neighbour.h:527 [inline]
 neigh_output include/net/neighbour.h:541 [inline]
 ip6_finish_output2+0xe06/0x1630 net/ipv6/ip6_output.c:141
 dst_output include/net/dst.h:467 [inline]
 NF_HOOK include/linux/netfilter.h:304 [inline]
 ndisc_send_skb+0xc26/0x14f0 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 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:184 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x30/0x60 kernel/kcov.c:216
Code: 04 24 65 48 8b 0d 00 a1 7c 7e 65 8b 15 01 a1 7c 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 74 2c <8b> 91 f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48
RSP: 0018:ffffc900044af178 EFLAGS: 00000246
RAX: ffffffff818f466c RBX: 000000000000002c RCX: ffff88801eaabc00
RDX: 0000000000000000 RSI: ffffc900044af220 RDI: 000000000000002c
RBP: ffffc900044af2c0 R08: 0000000000000002 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1d15bf6 R12: 1ffff92000895e40
R13: 000000000000002c R14: ffffc900044af220 R15: ffffc900044af240
 perf_trace_buf_alloc+0x1c/0x290 kernel/trace/trace_event_perf.c:399
 perf_trace_lock_acquire+0x1a0/0x410 include/trace/events/lock.h:24
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x3ef/0x420 kernel/locking/lockdep.c:5725
 rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 rcu_read_lock include/linux/rcupdate.h:786 [inline]
 trace_call_bpf+0xe4/0x6c0 kernel/trace/bpf_trace.c:142
 perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10263
 perf_trace_lock_acquire+0x34f/0x410 include/trace/events/lock.h:24
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x3ef/0x420 kernel/locking/lockdep.c:5725
 rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 rcu_read_lock include/linux/rcupdate.h:786 [inline]
 is_bpf_text_address+0x47/0x2a0 kernel/bpf/core.c:741
 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_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1811 [inline]
 slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 kmem_cache_free+0xf8/0x270 mm/slub.c:3852
 user_path_create+0x42/0x50 fs/namei.c:3953
 bpf_obj_do_pin kernel/bpf/inode.c:445 [inline]
 bpf_obj_pin_user+0x149/0x330 kernel/bpf/inode.c:488
 __sys_bpf+0x7be/0x890 kernel/bpf/syscall.c:5479
 __do_sys_bpf kernel/bpf/syscall.c:5580 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5578 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5578
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f59fdf9aeb9
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:00007f59feeb5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f59fe215fa0 RCX: 00007f59fdf9aeb9
RDX: 0000000000000018 RSI: 0000200000000240 RDI: 0000000000000006
RBP: 00007f59fe008c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f59fe216038 R14: 00007f59fe215fa0 R15: 00007ffdd4e9fef8
 </TASK>
CPU: 0 PID: 1789 Comm: syz.5.10378 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:ip6table_mangle_hook+0x0/0x720 net/ipv6/netfilter/ip6table_mangle.c:69
Code: 68 d1 8b 4c 89 f2 e8 ef 64 ff ff 89 c3 4c 89 f7 e8 e5 62 73 f8 89 d8 eb 0a e8 ec aa 35 f8 b8 f4 ff ff ff 5b 41 5e c3 0f 1f 00 <f3> 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48
RSP: 0018:ffffc90000007728 EFLAGS: 00000246
RAX: 1ffff11005c4c984 RBX: ffff88802e264c20 RCX: ffff8880282a9e00
RDX: ffffc900000077e0 RSI: ffff88806748fb40 RDI: ffff888067b23880
RBP: dffffc0000000000 R08: ffff8880282a9e00 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000100 R12: 0000000000000001
R13: ffff88802e264c18 R14: ffffffff895169d0 R15: ffffc900000077e0
FS:  00007fa9414a86c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34d12ff8 CR3: 00000000460aa000 CR4: 00000000003506f0
DR0: 0010000010000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
 nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
 nf_hook+0x228/0x390 include/linux/netfilter.h:259
 NF_HOOK_COND include/linux/netfilter.h:292 [inline]
 ip6_output+0x272/0x3b0 net/ipv6/ip6_output.c:240
 dst_output include/net/dst.h:467 [inline]
 NF_HOOK include/linux/netfilter.h:304 [inline]
 ndisc_send_skb+0xc26/0x14f0 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 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:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc9000434efe0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1a21d49b9decdd00
RDX: 0000000000000000 RSI: ffffffff8acada80 RDI: ffffffff8b1c81e0
RBP: ffffc9000434f0e8 R08: dffffc0000000000 R09: 1ffffffff2237ea0
R10: dffffc0000000000 R11: fffffbfff2237ea1 R12: 1ffff92000869e08
R13: ffffffff8d131fe0 R14: 0000000000000246 R15: dffffc0000000000
 rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 rcu_read_lock include/linux/rcupdate.h:786 [inline]
 trace_call_bpf+0xe4/0x6c0 kernel/trace/bpf_trace.c:142
 perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10263
 perf_trace_lock_acquire+0x34f/0x410 include/trace/events/lock.h:24
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x3ef/0x420 kernel/locking/lockdep.c:5725
 rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 rcu_read_lock_sched include/linux/rcupdate.h:878 [inline]
 pfn_valid+0xe9/0x420 include/linux/mmzone.h:2011
 page_table_check_set+0x25/0x6e0 mm/page_table_check.c:110
 page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
 set_ptes include/linux/pgtable.h:238 [inline]
 copy_present_pte mm/memory.c:979 [inline]
 copy_pte_range mm/memory.c:1083 [inline]
 copy_pmd_range mm/memory.c:1168 [inline]
 copy_pud_range mm/memory.c:1205 [inline]
 copy_p4d_range mm/memory.c:1229 [inline]
 copy_page_range+0x24e5/0x3670 mm/memory.c:1323
 dup_mmap kernel/fork.c:764 [inline]
 dup_mm kernel/fork.c:1692 [inline]
 copy_mm+0x11cb/0x1d50 kernel/fork.c:1741
 copy_process+0x16f7/0x3d80 kernel/fork.c:2506
 kernel_clone+0x24b/0x8a0 kernel/fork.c:2914
 __do_sys_clone kernel/fork.c:3057 [inline]
 __se_sys_clone kernel/fork.c:3041 [inline]
 __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3041
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa94059aeb9
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:00007fa9414a7fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fa940815fa0 RCX: 00007fa94059aeb9
RDX: 00002000000003c0 RSI: 0000200000000380 RDI: 0000000000200400
RBP: 00007fa940608c1f R08: 00002000000006c0 R09: 00002000000006c0
R10: 0000200000000400 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fa940816038 R14: 00007fa940815fa0 R15: 00007ffdf05aa7a8
 </TASK>