rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=f7c4/1/0x4000000000000000 softirq=34928/34929 fqs=6 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P35/1:b..l rcu: (detected by 0, t=10502 jiffies, g=63629, q=62 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5288 Comm: kworker/1:5 Not tainted 6.11.0-rc7-syzkaller-00017-gbc83b4d1f086 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: events_freezable_pwr_efficient sync_hw_clock RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:lock_acquire+0xc3/0x560 kernel/locking/lockdep.c:5730 Code: 07 0f 87 0e 04 00 00 89 d5 be 08 00 00 00 48 89 e8 48 c1 e8 06 48 8d 3c c5 18 4d 14 90 e8 05 c9 80 00 48 0f a3 2d b5 7c aa 0e <0f> 82 ad 03 00 00 48 c7 c0 18 80 14 90 48 ba 00 00 00 00 00 fc ff RSP: 0018:ffffc90000a18c00 EFLAGS: 00000047 RAX: 0000000000000001 RBX: 1ffff92000143182 RCX: ffffffff8169d05b RDX: fffffbfff20289a4 RSI: 0000000000000008 RDI: ffffffff90144d18 RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff20289a3 R10: ffffffff90144d1f R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000001 R14: ffffffff8e8735a0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32f1dff8 CR3: 00000000597b2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_objects_fill_pool lib/debugobjects.c:615 [inline] debug_object_activate+0x14c/0x540 lib/debugobjects.c:705 debug_hrtimer_activate kernel/time/hrtimer.c:423 [inline] debug_activate kernel/time/hrtimer.c:478 [inline] enqueue_hrtimer+0x25/0x3c0 kernel/time/hrtimer.c:1085 __run_hrtimer kernel/time/hrtimer.c:1706 [inline] __hrtimer_run_queues+0xaac/0xcc0 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x1f2/0x560 kernel/locking/lockdep.c:5727 Code: c1 05 1a ba 98 7e 83 f8 01 0f 85 ea 02 00 00 9c 58 f6 c4 02 0f 85 d5 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc90004777bd8 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff920008eef7d RCX: 0000000000000001 RDX: 0000000000000001 RSI: ffffffff8b4cda40 RDI: ffffffff8bb0fc00 RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffff93c94d37 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffff88801ac81d48 R15: 0000000000000000 process_one_work+0x12a6/0x1b40 kernel/workqueue.c:3206 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 task:kworker/u8:2 state:R running task stack:24272 pid:35 tgid:35 ppid:2 flags:0x00004000 Workqueue: bat_events batadv_nc_worker Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xe37/0x5490 kernel/sched/core.c:6529 preempt_schedule_notrace+0x62/0xe0 kernel/sched/core.c:6801 preempt_schedule_notrace_thunk+0x1a/0x30 arch/x86/entry/thunk.S:13 rcu_is_watching+0x8e/0xc0 kernel/rcu/tree.c:727 trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x47b/0x560 kernel/locking/lockdep.c:5730 rcu_lock_acquire include/linux/rcupdate.h:326 [inline] rcu_read_lock include/linux/rcupdate.h:838 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0x16a/0x1060 net/batman-adv/network-coding.c:719 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: rcu_preempt kthread starved for 10487 jiffies! g63629 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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:27680 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xe37/0x5490 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6621 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2034 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2236 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 12347 Comm: syz.2.3130 Not tainted 6.11.0-rc7-syzkaller-00017-gbc83b4d1f086 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:csd_lock_wait kernel/smp.c:312 [inline] RIP: 0010:smp_call_function_many_cond+0x4e7/0x1420 kernel/smp.c:856 Code: 0c 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 cb 34 0c 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 f7 0c 00 00 8b 43 08 31 RSP: 0018:ffffc9000334f818 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b8944b80 RCX: ffffffff817f9bab RDX: ffff88803468bc00 RSI: ffffffff817f9b85 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1017128971 R13: 0000000000000001 R14: ffff8880b8944b88 R15: ffff8880b883ffc0 FS: 0000000000000000(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32f1bff8 CR3: 0000000065576000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:941 [inline] flush_tlb_mm_range+0x293/0x330 arch/x86/mm/tlb.c:1027 tlb_flush arch/x86/include/asm/tlb.h:20 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:465 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:455 [inline] tlb_flush_mmu mm/mmu_gather.c:372 [inline] tlb_finish_mmu+0x3c9/0x7b0 mm/mmu_gather.c:465 exit_mmap+0x3d1/0xb20 mm/mmap.c:3425 __mmput+0x12a/0x480 kernel/fork.c:1345 mmput+0x62/0x70 kernel/fork.c:1367 exit_mm kernel/exit.c:571 [inline] do_exit+0x9bf/0x2bb0 kernel/exit.c:869 do_group_exit+0xd3/0x2a0 kernel/exit.c:1031 get_signal+0x25fb/0x2770 kernel/signal.c:2917 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f68a377def9 Code: Unable to access opcode bytes at 0x7f68a377decf. RSP: 002b:00007f68a45920e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f68a3935f88 RCX: 00007f68a377def9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f68a3935f88 RBP: 00007f68a3935f80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f68a3935f8c R13: 0000000000000000 R14: 00007ffe5c848f10 R15: 00007ffe5c848ff8