rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...0: (1 GPs behind) idle=bbbc/1/0x4000000000000000 softirq=79643/79645 fqs=1516
(detected by 0, t=10506 jiffies, g=128709, q=137 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 28628 Comm: kworker/u4:14 Not tainted 6.0.0-rc7-syzkaller-00042-g46452d3786a8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: bat_events batadv_nc_worker
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:121 [inline]
RIP: 0010:rcu_is_watching+0x2e/0xb0 kernel/rcu/tree.c:718
Code: 05 c7 1d 9c 7e e8 b2 fa 19 08 48 c7 c3 48 4c 03 00 83 f8 07 89 c5 77 7a 48 8d 3c ed e0 28 a2 8b 48 b8 00 00 00 00 00 fc ff df <48> 89 fa 48 c1 ea 03 80 3c 02 00 75 54 48 03 1c ed e0 28 a2 8b 48
RSP: 0018:ffffc900001f0bf8 EFLAGS: 00000097
RAX: dffffc0000000000 RBX: 0000000000034c48 RCX: ffffffff815f7cf8
RDX: dffffc0000000000 RSI: 0000000000010004 RDI: ffffffff8ba228e8
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8ddee457
R10: fffffbfff1bbdc8a R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffffffff913f23d8 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555565de708 CR3: 0000000045b5f000 CR4: 0000000000350ee0
Call Trace:
rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
rcu_read_lock_sched_held+0x1c/0x70 kernel/rcu/update.c:123
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x480/0x570 kernel/locking/lockdep.c:5637
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:658
debug_hrtimer_activate kernel/time/hrtimer.c:420 [inline]
debug_activate kernel/time/hrtimer.c:475 [inline]
enqueue_hrtimer+0x27/0x3e0 kernel/time/hrtimer.c:1084
__run_hrtimer kernel/time/hrtimer.c:1702 [inline]
__hrtimer_run_queues+0xaf3/0xe40 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__local_bh_enable_ip+0xa8/0x120 kernel/softirq.c:403
Code: 1d bd 56 b9 7e 65 8b 05 b6 56 b9 7e a9 00 ff ff 00 74 45 bf 01 00 00 00 e8 85 9f 09 00 e8 b0 66 39 00 fb 65 8b 05 98 56 b9 7e <85> c0 74 58 5b 5d c3 65 8b 05 86 5d b9 7e 85 c0 75 a2 0f 0b eb 9e
RSP: 0018:ffffc9000339fc00 EFLAGS: 00000206
RAX: 0000000080000000 RBX: 00000000fffffe00 RCX: 1ffffffff212796e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8919bf75 R08: 0000000000000001 R09: ffffffff908e5a27
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880790097a8
R13: ffff888079008c80 R14: dffffc0000000000 R15: ffffffff8919c1d0
spin_unlock_bh include/linux/spinlock.h:394 [inline]
batadv_nc_purge_paths+0x2a5/0x3a0 net/batman-adv/network-coding.c:471
batadv_nc_worker+0x8f9/0xfa0 net/batman-adv/network-coding.c:720
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
rcu: rcu_preempt kthread starved for 2925 jiffies! g128709 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:28360 pid: 17 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5182 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6494
schedule+0xda/0x1b0 kernel/sched/core.c:6570
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935
rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1657
rcu_gp_kthread+0x236/0x360 kernel/rcu/tree.c:1854
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.0.0-rc7-syzkaller-00042-g46452d3786a8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:514
print_other_cpu_stall kernel/rcu/tree_stall.h:619 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:762 [inline]
rcu_pending kernel/rcu/tree.c:3660 [inline]
rcu_sched_clock_irq+0x2404/0x2530 kernel/rcu/tree.c:2342
update_process_times+0x11a/0x1a0 kernel/time/timer.c:1839
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1480
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:113 [inline]
RIP: 0010:acpi_idle_do_entry+0x1fd/0x2a0 drivers/acpi/processor_idle.c:572
Code: 89 de e8 06 b3 f8 f7 84 db 75 ac e8 7d b6 f8 f7 e8 a8 2d ff f7 eb 0c e8 71 b6 f8 f7 0f 00 2d aa 7b d1 00 e8 65 b6 f8 f7 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 30 b3 f8 f7 48 85 db
RSP: 0018:ffffffff8bc07d30 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffffff8bcbc980 RSI: ffffffff898351bb RDI: 0000000000000000
RBP: ffff888145ce0064 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffff888145ce0000 R14: ffff888145ce0064 R15: ffff88801b6c9804
acpi_idle_enter+0x364/0x500 drivers/acpi/processor_idle.c:709
cpuidle_enter_state+0x1ab/0xd30 drivers/cpuidle/cpuidle.c:239
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:356
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x3e8/0x590 kernel/sched/idle.c:303
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
rest_init+0x169/0x270 init/main.c:727
arch_call_rest_init+0xf/0x14 init/main.c:883
start_kernel+0x46e/0x48f init/main.c:1138
secondary_startup_64_no_verify+0xce/0xdb