rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (5 ticks this GP) idle=98f4/1/0x4000000000000000 softirq=13235/13235 fqs=0 rcu: (detected by 0, t=10506 jiffies, g=12425, q=839 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6169 Comm: syz.2.95 Not tainted 6.6.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:234 Code: f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 0f 1f 00 f3 0f 1e fa 48 8b 04 24 65 48 8b 15 70 2e 7e 7e 65 8b RSP: 0018:ffffc900001f0860 EFLAGS: 00000006 RAX: ffffffff81303b6f RBX: 0000005efae61824 RCX: ffff88802ade1e00 RDX: 0000000000010100 RSI: 0000000000000000 RDI: 0000000000000002 RBP: ffffc900001f0900 R08: ffffffff8e4a882f R09: 1ffffffff1c95105 R10: dffffc0000000000 R11: fffffbfff1c95106 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffc900001f08e0 R15: 1ffff9200003e118 FS: 00007f6c1609b6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001840 CR3: 000000002e7a2000 CR4: 00000000003506e0 Call Trace: sched_clock+0x3f/0x60 arch/x86/kernel/tsc.c:284 sched_clock_cpu+0x75/0x430 kernel/sched/clock.c:394 irqtime_account_irq+0x6e/0x1c0 kernel/sched/cputime.c:64 account_hardirq_exit include/linux/vtime.h:159 [inline] __irq_exit_rcu+0x8d/0x190 kernel/softirq.c:658 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x53/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723 RIP: 0010:rcu_read_unlock_special+0x88/0x4c0 kernel/rcu/tree_plugin.h:682 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 39 58 93 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc900001f0b00 EFLAGS: 00000206 RAX: a47b678f2bfebb00 RBX: 1ffff9200003e168 RCX: a47b678f2bfebb00 RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: ffffffff8afc66c0 RBP: ffffc900001f0bf0 R08: ffffffff8e4a882f R09: 1ffffffff1c95105 R10: dffffc0000000000 R11: fffffbfff1c95106 R12: ffffffff8cd35400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:818 [inline] ieee80211_iterate_active_interfaces_atomic+0x15a/0x180 net/mac80211/util.c:804 mac80211_hwsim_beacon+0xbb/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2295 __run_hrtimer kernel/time/hrtimer.c:1755 [inline] __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1836 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+0xc7/0x190 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 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:7009 Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 4b da e5 f6 e8 46 5f 16 f7 fb bf 01 00 00 00 db b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc9000b52ee20 EFLAGS: 00000282 RAX: a47b678f2bfebb00 RBX: 0000000000000000 RCX: a47b678f2bfebb00 RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: 0000000000000001 RBP: ffffc9000b52eec0 R08: ffffffff8e4a882f R09: 1ffffffff1c95105 R10: dffffc0000000000 R11: fffffbfff1c95106 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920016a5dc4 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:get_task_policy mm/mempolicy.c:171 [inline] RIP: 0010:alloc_pages_bulk_array_mempolicy+0x97/0x9e0 mm/mempolicy.c:2362 Code: 8c eb 38 65 48 8b 1d 18 66 2a 7e 48 81 c3 d0 14 00 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 4c 7e 03 00 48 8b 1b <48> 85 db 0f 84 3c 05 00 00 e8 0b 37 ac ff 49 89 df 48 8b 1c 24 4c RSP: 0018:ffffc9000b52ef80 EFLAGS: 00000246 RAX: 1ffff110055bc65a RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffff88802ade1e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: 0000000000000028 R09: 0000000011acd865 R10: dffffc0000000000 R11: fffffbfff1c95106 R12: 00000000ffffffff R13: 0000000000000000 R14: 0000000000002cc2 R15: ffff88814d756e10 vm_area_alloc_pages mm/vmalloc.c:3055 [inline] __vmalloc_area_node mm/vmalloc.c:3158 [inline] __vmalloc_node_range+0x721/0x1320 mm/vmalloc.c:3339 __vmalloc_node mm/vmalloc.c:3404 [inline] vmalloc+0x79/0x90 mm/vmalloc.c:3437 bpf_prog_calc_tag+0xbb/0x670 kernel/bpf/core.c:293 resolve_pseudo_ldimm64+0xd0/0x10c0 kernel/bpf/verifier.c:17657 bpf_check+0x3650/0xe970 kernel/bpf/verifier.c:20411 bpf_prog_load+0x11cb/0x16d0 kernel/bpf/syscall.c:2744 __sys_bpf+0x55a/0x800 kernel/bpf/syscall.c:5467 __do_sys_bpf kernel/bpf/syscall.c:5571 [inline] __se_sys_bpf kernel/bpf/syscall.c:5569 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f6c1518ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6c1609b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f6c153b5fa0 RCX: 00007f6c1518ebe9 RDX: 0000000000000090 RSI: 0000200000000240 RDI: 0000000000000005 RBP: 00007f6c15211e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6c153b6038 R14: 00007f6c153b5fa0 R15: 00007ffd3e0a56b8 rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g12425 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=16501 rcu: rcu_preempt kthread starved for 10506 jiffies! g12425 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27464 pid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 schedule+0xbd/0x170 kernel/sched/core.c:6773 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667 rcu_gp_kthread+0x99/0x380 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 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: 6169 Comm: syz.2.95 Not tainted 6.6.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:hlock_id kernel/locking/lockdep.c:430 [inline] RIP: 0010:__lock_acquire+0xede/0x7c80 kernel/locking/lockdep.c:5125 Code: 18 f7 c3 00 60 00 00 74 11 49 c7 c7 ff ff ff ff c7 44 24 18 00 00 00 00 eb 06 b0 01 89 44 24 18 48 8b 44 24 48 42 0f b6 04 00 <84> c0 0f 85 06 5c 00 00 48 8b 44 24 10 44 8b 20 48 83 7d 10 00 0f RSP: 0018:ffffc900001efea0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000039 RCX: ffffffff81671180 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90da3500 RBP: ffffc900001f00e8 R08: dffffc0000000000 R09: 1ffffffff21b46a0 R10: dffffc0000000000 R11: fffffbfff21b46a1 R12: 0000000000000002 R13: ffff88802ade1e00 R14: ffff88802ade28e0 R15: d8332a6fa9f2d431 FS: 00007f6c1609b6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001840 CR3: 000000002e7a2000 CR4: 00000000003506e0 Call Trace: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 rcu_lock_acquire include/linux/rcupdate.h:334 [inline] rcu_read_lock_sched include/linux/rcupdate.h:878 [inline] pfn_valid include/linux/mmzone.h:2011 [inline] __virt_addr_valid+0x1a9/0x540 arch/x86/mm/physaddr.c:65 kasan_addr_to_slab+0xd/0xd0 mm/kasan/common.c:35 __kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:477 irq_work_queue_on+0xf5/0x220 kernel/irq_work.c:150 rcu_read_unlock_special+0x3a7/0x4c0 kernel/rcu/tree_plugin.h:675 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:818 [inline] __perf_event_output kernel/events/core.c:7983 [inline] perf_event_output_forward+0x2e6/0x3a0 kernel/events/core.c:7992 __perf_event_overflow+0x447/0x630 kernel/events/core.c:9717 perf_swevent_overflow kernel/events/core.c:9793 [inline] perf_swevent_event+0x2f5/0x5c0 kernel/events/core.c:-1 perf_tp_event+0x4f9/0x13a0 kernel/events/core.c:10343 perf_trace_run_bpf_submit+0xf4/0x1c0 kernel/events/core.c:10267 perf_trace_preemptirq_template+0x281/0x340 include/trace/events/preemptirq.h:14 trace_irq_enable+0xbf/0xe0 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723 RIP: 0010:rcu_read_unlock_special+0x88/0x4c0 kernel/rcu/tree_plugin.h:682 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 39 58 93 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc900001f0b00 EFLAGS: 00000206 RAX: a47b678f2bfebb00 RBX: 1ffff9200003e168 RCX: a47b678f2bfebb00 RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: ffffffff8afc66c0 RBP: ffffc900001f0bf0 R08: ffffffff8e4a882f R09: 1ffffffff1c95105 R10: dffffc0000000000 R11: fffffbfff1c95106 R12: ffffffff8cd35400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:818 [inline] ieee80211_iterate_active_interfaces_atomic+0x15a/0x180 net/mac80211/util.c:804 mac80211_hwsim_beacon+0xbb/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2295 __run_hrtimer kernel/time/hrtimer.c:1755 [inline] __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1836 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+0xc7/0x190 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 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:7009 Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 4b da e5 f6 e8 46 5f 16 f7 fb bf 01 00 00 00 db b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc9000b52ee20 EFLAGS: 00000282 RAX: a47b678f2bfebb00 RBX: 0000000000000000 RCX: a47b678f2bfebb00 RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: 0000000000000001 RBP: ffffc9000b52eec0 R08: ffffffff8e4a882f R09: 1ffffffff1c95105 R10: dffffc0000000000 R11: fffffbfff1c95106 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920016a5dc4 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:get_task_policy mm/mempolicy.c:171 [inline] RIP: 0010:alloc_pages_bulk_array_mempolicy+0x97/0x9e0 mm/mempolicy.c:2362 Code: 8c eb 38 65 48 8b 1d 18 66 2a 7e 48 81 c3 d0 14 00 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 4c 7e 03 00 48 8b 1b <48> 85 db 0f 84 3c 05 00 00 e8 0b 37 ac ff 49 89 df 48 8b 1c 24 4c RSP: 0018:ffffc9000b52ef80 EFLAGS: 00000246 RAX: 1ffff110055bc65a RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffff88802ade1e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: 0000000000000028 R09: 0000000011acd865 R10: dffffc0000000000 R11: fffffbfff1c95106 R12: 00000000ffffffff R13: 0000000000000000 R14: 0000000000002cc2 R15: ffff88814d756e10 vm_area_alloc_pages mm/vmalloc.c:3055 [inline] __vmalloc_area_node mm/vmalloc.c:3158 [inline] __vmalloc_node_range+0x721/0x1320 mm/vmalloc.c:3339 __vmalloc_node mm/vmalloc.c:3404 [inline] vmalloc+0x79/0x90 mm/vmalloc.c:3437 bpf_prog_calc_tag+0xbb/0x670 kernel/bpf/core.c:293 resolve_pseudo_ldimm64+0xd0/0x10c0 kernel/bpf/verifier.c:17657 bpf_check+0x3650/0xe970 kernel/bpf/verifier.c:20411 bpf_prog_load+0x11cb/0x16d0 kernel/bpf/syscall.c:2744 __sys_bpf+0x55a/0x800 kernel/bpf/syscall.c:5467 __do_sys_bpf kernel/bpf/syscall.c:5571 [inline] __se_sys_bpf kernel/bpf/syscall.c:5569 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f6c1518ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6c1609b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f6c153b5fa0 RCX: 00007f6c1518ebe9 RDX: 0000000000000090 RSI: 0000200000000240 RDI: 0000000000000005 RBP: 00007f6c15211e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6c153b6038 R14: 00007f6c153b5fa0 R15: 00007ffd3e0a56b8