rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4293/1:b..l
	(detected by 0, t=10502 jiffies, g=222253, q=22 ncpus=2)
task:kworker/u4:5    state:R  running task     stack:21440 pid:4293  ppid:2      flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:debug_lockdep_rcu_enabled+0x12/0x30 kernel/rcu/update.c:280
Code: 8c 8a e8 51 c1 36 f7 0f 0b eb d1 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 31 c0 83 3d e7 24 09 04 00 74 1d 83 3d 72 58 09 04 00 <74> 14 65 48 8b 0d 44 47 ec 75 31 c0 83 b9 dc 0a 00 00 00 0f 94 c0
RSP: 0018:ffffc90003f37bd8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88801d785b40 RCX: 731d01c426fe6600
RDX: 0000000000000000 RSI: ffffffff8a8c15e0 RDI: ffffffff8adef320
RBP: ffff88805b0a5468 R08: dffffc0000000000 R09: fffffbfff215ba49
R10: fffffbfff215ba49 R11: 1ffffffff215ba48 R12: dffffc0000000000
R13: ffffffff89e0239e R14: ffff888062ae8c80 R15: 000000000000028d
 rcu_read_lock include/linux/rcupdate.h:792 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0xf4/0x600 net/batman-adv/network-coding.c:719
 process_one_work+0x898/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: rcu_preempt kthread starved for 10520 jiffies! g222253 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:26912 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
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: 31495 Comm: syz.5.6143 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:219
Code: 8b 15 55 a8 81 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 74 2c 8b 91 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
RSP: 0018:ffffc9000492fae8 EFLAGS: 00000246
RAX: ffffffff812f0c0a RBX: ffff8880266936c0 RCX: ffff888026691dc0
RDX: 0000000000000002 RSI: 000000000007ffff RDI: ffff8880266936c0
RBP: ffffc9000492fcf0 R08: dffffc0000000000 R09: ffffed1004cd23b9
R10: ffffed1004cd23b9 R11: 1ffff11004cd23b8 R12: 1ffff92000925f74
R13: 0000000000000000 R14: ffff8880266936c0 R15: dffffc0000000000
FS:  00007fdb58ad26c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000064320000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 fpregs_activate+0x1a/0x230 arch/x86/kernel/fpu/context.h:48
 fpregs_mark_activate+0x23/0x80 arch/x86/kernel/fpu/core.c:779
 restore_fpregs_from_user arch/x86/kernel/fpu/signal.c:330 [inline]
 __fpu_restore_sig arch/x86/kernel/fpu/signal.c:359 [inline]
 fpu__restore_sig+0x992/0x1190 arch/x86/kernel/fpu/signal.c:493
 restore_sigcontext arch/x86/kernel/signal.c:140 [inline]
 __ia32_sys_rt_sigreturn+0x649/0x790 arch/x86/kernel/signal.c:675
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fdb57b8eb67
Code: ff ff 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
RSP: 002b:00007fdb58ad2038 EFLAGS: 00000246
RAX: 000000000000012b RBX: 00007fdb57db5fa0 RCX: 00007fdb57b8eb69
RDX: 0000000000000001 RSI: 00002000000005c0 RDI: 0000000000000005
RBP: 00007fdb57c11df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010020 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fdb57db5fa0 R15: 00007ffe764e50d8
 </TASK>
vkms_vblank_simulate: vblank timer overrun