rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11717/1:b..l P107/1:b..l (detected by 1, t=10503 jiffies, g=25897, q=221) task:syz-executor.2 state:R running task stack:29024 pid:11776 ppid: 8469 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5535 irqentry_exit+0x31/0x80 kernel/entry/common.c:426 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:197 Code: ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 40 00 65 8b 05 59 de 8d 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9 RSP: 0018:ffffc90001587a78 EFLAGS: 00000246 RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffff88807a16c000 RDX: 0000000000000000 RSI: ffff88807a16c000 RDI: 0000000000000003 RBP: ffff88814823a000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff82045647 R11: 0000000000000000 R12: ffff88801b56d488 R13: 0000000000000000 R14: ffff88814823a678 R15: 0000000000000000 rcu_read_unlock include/linux/rcupdate.h:707 [inline] ext4_get_group_desc+0x2f8/0x510 fs/ext4/balloc.c:284 recently_deleted fs/ext4/ialloc.c:684 [inline] find_inode_bit+0x1c4/0x580 fs/ext4/ialloc.c:730 __ext4_new_inode+0xc4d/0x5600 fs/ext4/ialloc.c:1065 ext4_symlink+0x489/0xd50 fs/ext4/namei.c:3465 vfs_symlink fs/namei.c:4172 [inline] vfs_symlink+0x47d/0x6a0 fs/namei.c:4157 do_symlinkat+0x27a/0x300 fs/namei.c:4202 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ee7 RSP: 002b:00007ffe3e6c5cb8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000465ee7 RDX: 00007ffe3e6c5da3 RSI: 00000000004bfd70 RDI: 00007ffe3e6c5d90 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe3e6c5b50 R10: 00007ffe3e6c5a07 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffe3e6c5d90 task:kworker/u4:3 state:R running task stack:25488 pid: 107 ppid: 2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5535 irqentry_exit+0x31/0x80 kernel/entry/common.c:426 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:197 Code: ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 40 00 65 8b 05 59 de 8d 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9 RSP: 0018:ffffc900012c7b40 EFLAGS: 00000246 RAX: 0000000080000000 RBX: 0000000000061505 RCX: 0000000000061505 RDX: 0000000000000000 RSI: ffff8880153ee140 RDI: 0000000000000003 RBP: 0000000000061505 R08: 0000000000061505 R09: 0000000000000001 R10: ffffffff878ae18d R11: 0000000000000000 R12: ffffffff8d971240 R13: ffffc900012c7ca8 R14: 0000000000000002 R15: dffffc0000000000 rcu_read_unlock include/linux/rcupdate.h:707 [inline] inet_twsk_purge+0x4fb/0x7c0 net/ipv4/inet_timewait_sock.c:299 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276 worker_thread+0x64c/0x1120 kernel/workqueue.c:2422 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 task:kworker/u4:10 state:R running task stack:26736 pid:11717 ppid: 2 flags:0x00004000 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5535 irqentry_exit+0x31/0x80 kernel/entry/common.c:426 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline] RIP: 0010:rcu_read_lock_sched_notrace include/linux/rcupdate.h:773 [inline] RIP: 0010:trace_lock_acquire include/trace/events/lock.h:13 [inline] RIP: 0010:lock_acquire+0x577/0x740 kernel/locking/lockdep.c:5483 Code: 00 44 89 f2 4c 89 ee ff 74 24 08 e8 23 26 ff ff 5f 41 58 65 ff 0d 79 2f a8 7e 0f 85 1b fb ff ff e8 4d 85 a6 ff e9 11 fb ff ff <65> ff 05 62 2f a8 7e 48 8b 05 9b 75 5b 0c e8 96 e1 bc 07 85 c0 74 RSP: 0018:ffffc9000211faa8 EFLAGS: 00000247 RAX: 0000000000000001 RBX: 1ffff92000423f57 RCX: ffffffff8159bb98 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff8dc94050 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8dc94057 R10: fffffbfff1b9280a R11: 0000000000000000 R12: 0000000000000002 R13: ffffffff8bf76be0 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:267 [inline] rcu_read_lock include/linux/rcupdate.h:657 [inline] batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:754 [inline] batadv_iv_ogm_schedule_buff+0x5d0/0x1410 net/batman-adv/bat_iv_ogm.c:825 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline] batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x675/0x920 net/batman-adv/bat_iv_ogm.c:1723 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276 worker_thread+0x64c/0x1120 kernel/workqueue.c:2422 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 rcu: rcu_preempt kthread starved for 10570 jiffies! g25897 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:29032 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1892 rcu_gp_fqs_loop kernel/rcu/tree.c:2004 [inline] rcu_gp_kthread+0xd07/0x2300 kernel/rcu/tree.c:2177 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 rcu: Stack dump where RCU GP kthread last ran: NMI backtrace for cpu 1 CPU: 1 PID: 11748 Comm: syz-executor.5 Not tainted 5.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_check_gp_kthread_starvation.cold+0x1cc/0x1d1 kernel/rcu/tree_stall.h:478 print_other_cpu_stall kernel/rcu/tree_stall.h:583 [inline] check_cpu_stall kernel/rcu/tree_stall.h:708 [inline] rcu_pending kernel/rcu/tree.c:3911 [inline] rcu_sched_clock_irq+0x1d46/0x2080 kernel/rcu/tree.c:2649 update_process_times+0x16d/0x200 kernel/time/timer.c:1796 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1373 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1601 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:30 [inline] RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:52 Code: 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 01 RSP: 0018:ffffc90000dd86a0 EFLAGS: 00000a03 RAX: 1ffffffff1c4588c RBX: ffffffff8e22c464 RCX: ffffffff8704eded RDX: 0000000000000000 RSI: ffffffff8eb5c41a RDI: ffffffff8e22c44c RBP: ffffffff8e22c44c R08: 0000000000000000 R09: ffffffff8eb5c41a R10: fffff520001bb103 R11: 0000000000084087 R12: ffffffff8e22c47c R13: ffffffff8e22c44c R14: ffffffff8e22c44c R15: dffffc0000000000 orc_find arch/x86/kernel/unwind_orc.c:173 [inline] unwind_next_frame+0x32a/0x1ce0 arch/x86/kernel/unwind_orc.c:443 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:428 [inline] ____kasan_kmalloc mm/kasan/common.c:507 [inline] ____kasan_kmalloc mm/kasan/common.c:466 [inline] __kasan_kmalloc+0x98/0xc0 mm/kasan/common.c:516 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:425 skb_copy+0x137/0x2f0 net/core/skbuff.c:1562 mac80211_hwsim_tx_frame_no_nl.isra.0+0xb17/0x1330 drivers/net/wireless/mac80211_hwsim.c:1563 mac80211_hwsim_tx_frame+0x14f/0x1e0 drivers/net/wireless/mac80211_hwsim.c:1775 mac80211_hwsim_beacon_tx+0x4ba/0x910 drivers/net/wireless/mac80211_hwsim.c:1829 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1852 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x609/0xe40 kernel/time/hrtimer.c:1601 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1618 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559 invoke_softirq kernel/softirq.c:433 [inline] __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:stack_trace_consume_entry+0xb/0x160 kernel/stacktrace.c:82 Code: 1b 71 11 00 48 c7 c1 e0 6f 6d 89 31 d2 be 80 01 00 00 48 c7 c7 e0 6d 6d 89 e9 11 3b 8a 00 cc 48 b8 00 00 00 00 00 fc ff df 55 <53> 48 89 fb 48 83 c7 10 48 89 fa 48 83 ec 08 48 c1 ea 03 0f b6 04 RSP: 0018:ffffc9000209f410 EFLAGS: 00000286 RAX: dffffc0000000000 RBX: ffffffff8162a060 RCX: 0000000000000000 RDX: 1ffff92000413e8d RSI: ffffffff8181adf5 RDI: ffffc9000209f4d8 RBP: ffffc9000209f4a8 R08: ffffffff8e496d44 R09: 0000000000000001 R10: fffff52000413e8f R11: 0000000000084087 R12: ffffc9000209f4d8 R13: 0000000000000000 R14: ffff888078cc8040 R15: 0000003dae90a1ae arch_stack_walk+0x6d/0xe0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 save_stack+0x151/0x1e0 mm/page_owner.c:119 __reset_page_owner+0x5d/0x170 mm/page_owner.c:140 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1298 [inline] free_pcp_prepare+0x223/0x300 mm/page_alloc.c:1342 free_unref_page_prepare mm/page_alloc.c:3250 [inline] free_unref_page+0x12/0x1d0 mm/page_alloc.c:3298 kasan_depopulate_vmalloc_pte+0x5c/0x70 mm/kasan/shadow.c:369 apply_to_pte_range mm/memory.c:2425 [inline] apply_to_pmd_range mm/memory.c:2469 [inline] apply_to_pud_range mm/memory.c:2505 [inline] apply_to_p4d_range mm/memory.c:2541 [inline] __apply_to_page_range+0x69a/0x1050 mm/memory.c:2575 kasan_release_vmalloc+0xa7/0xc0 mm/kasan/shadow.c:479 __purge_vmap_area_lazy+0x8f9/0x1c50 mm/vmalloc.c:1652 _vm_unmap_aliases.part.0+0x3dd/0x4f0 mm/vmalloc.c:2055 _vm_unmap_aliases mm/vmalloc.c:2029 [inline] vm_unmap_aliases+0x47/0x50 mm/vmalloc.c:2078 change_page_attr_set_clr+0x241/0x500 arch/x86/mm/pat/set_memory.c:1740 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1797 [inline] set_memory_ro+0x78/0xa0 arch/x86/mm/pat/set_memory.c:1943 bpf_prog_lock_ro include/linux/filter.h:844 [inline] bpf_prog_select_runtime+0x68a/0x830 kernel/bpf/core.c:1880 bpf_prog_load+0xe75/0x1f30 kernel/bpf/syscall.c:2221 __do_sys_bpf+0x1272/0x4f40 kernel/bpf/syscall.c:4411 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2514fa7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9 RDX: 0000000000000048 RSI: 00000000200054c0 RDI: 0000000000000005 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007fffedba874f R14: 00007f2514fa7300 R15: 0000000000022000