rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9/1:b..l
(detected by 1, t=10502 jiffies, g=56425, q=69 ncpus=2)
task:kworker/u4:0 state:R running task stack:22432 pid:9 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6562
preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:lock_acquire+0x225/0x4a0 kernel/locking/lockdep.c:5666
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 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 44 3d 00 00 00 00 00 43 c7 44 3d 08 00 00 00 00 65 48 8b 04
RSP: 0018:ffffc900000e7ac0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 26d7dad37770f800
RDX: 0000000000000000 RSI: ffffffff8a8c2920 RDI: ffffffff8adee1a0
RBP: ffffc900000e7bc8 R08: dffffc0000000000 R09: 1ffffffff215e448
R10: dffffc0000000000 R11: fffffbfff215e449 R12: 0000000000000000
R13: 1ffff9200001cf64 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0xeb/0x600 net/batman-adv/network-coding.c:719
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: rcu_preempt kthread starved for 10521 jiffies! g56425 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:27504 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x303/0x1350 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8988 Comm: syz.7.1012 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:147 [inline]
RIP: 0010:wrmsr arch/x86/include/asm/msr.h:254 [inline]
RIP: 0010:native_apic_msr_write+0x35/0x50 arch/x86/include/asm/apic.h:206
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 89 f6 31 d2 e9 ff 50 00 03 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0018:ffffc90000007e60 EFLAGS: 00000046
RAX: 000000000004b276 RBX: 000000000004b276 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000004b276 RDI: 0000000000000838
RBP: 0000000000000000 R08: ffffffff8e200f6f R09: 1ffffffff1c401ed
R10: dffffc0000000000 R11: fffffbfff1c401ee R12: dffffc0000000000
R13: 00000000100015cf R14: ffffffff8c651b40 R15: dffffc0000000000
FS: 0000555559407500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000058ab9000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
apic_write arch/x86/include/asm/apic.h:394 [inline]
lapic_next_event+0x5b/0x70 arch/x86/kernel/apic/apic.c:478
clockevents_program_event+0x1bc/0x310 kernel/time/clockevents.c:334
hrtimer_interrupt+0x561/0x980 kernel/time/hrtimer.c:1890
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:local_bh_enable include/linux/bottom_half.h:33 [inline]
RIP: 0010:fpregs_unlock arch/x86/include/asm/fpu/api.h:80 [inline]
RIP: 0010:fpu__clear_user_states+0x1c2/0x310 arch/x86/kernel/fpu/core.c:766
Code: fb 08 48 89 e9 48 c1 e9 03 42 0f b6 0c 31 84 c9 75 3b 89 83 40 19 00 00 48 89 df be 08 00 00 00 e8 43 cf a3 00 f0 80 63 01 bf <4c> 89 ff be 00 02 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 57 bf 1f
RSP: 0018:ffffc90003fc7c68 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff888025808000 RCX: ffffffff812f7b2d
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888025808000
RBP: ffff888025809940 R08: ffff888025808007 R09: 1ffff11004b01000
R10: dffffc0000000000 R11: ffffed1004b01001 R12: ffff888025809980
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff812f79a6
handle_signal arch/x86/kernel/signal.c:844 [inline]
arch_do_signal_or_restart+0xf26/0x1310 arch/x86/kernel/signal.c:873
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb7479bc3d0
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d aa 1d 07 00 e8 65 65 f9 ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007fff152f7878 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffffffffffffa4dc RCX: 0000000000000002
RDX: 00007fff152f7880 RSI: 00007fff152f79b0 RDI: 0000000000000021
RBP: 0000000000000000 R08: 00007fb747c00000 R09: 00007fb747c02000
R10: 00000000812f88d6 R11: 0000000000000013 R12: 0000000000000000
R13: 000000000000006e R14: ffffffff812f81bc R15: 00007fb748745720