rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P10135/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=62117, q=427 ncpus=1)
task:syz-executor    state:R  running task     stack:21736 pid:10135 ppid:10118  flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6889
 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6913
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 copy_pte_range mm/memory.c:1107 [inline]
 copy_pmd_range mm/memory.c:1168 [inline]
 copy_pud_range mm/memory.c:1205 [inline]
 copy_p4d_range mm/memory.c:1229 [inline]
 copy_page_range+0x2be5/0x3700 mm/memory.c:1323
 dup_mmap kernel/fork.c:769 [inline]
 dup_mm kernel/fork.c:1703 [inline]
 copy_mm+0x1751/0x1e30 kernel/fork.c:1752
 copy_process+0x16c9/0x3da0 kernel/fork.c:2513
 kernel_clone+0x24b/0x8a0 kernel/fork.c:2922
 __do_sys_clone kernel/fork.c:3065 [inline]
 __se_sys_clone kernel/fork.c:3049 [inline]
 __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3049
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7cf09d4bd2
RSP: 002b:00007ffc47d89b60 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc47d89b60 RCX: 00007f7cf09d4bd2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc47d89cec R08: 0000000000000000 R09: 0000000000000001
R10: 000055557af5e7d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 0000000000057738 R15: 00007ffc47d89d40
 </TASK>
rcu: rcu_preempt kthread starved for 5289 jiffies! g62117 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:27816 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x30d/0x15e0 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9e/0x400 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 3388 Comm: kworker/R-bat_e Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 6b a2 bb f6 65 8b 05 7c 23 62 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc900000079a0 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: e53c9007500c8000
RDX: dffffc0000000000 RSI: ffffffff8aead140 RDI: 0000000000000001
RBP: ffffc90000007a30 R08: ffffffff922235f7 R09: 1ffffffff24446be
R10: dffffc0000000000 R11: fffffbfff24446bf R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88802602c000 R15: 1ffff92000000f34
FS:  0000000000000000(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2e4677a5a8 CR3: 00000000649bc000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 dummy_timer+0x325e/0x35d0 drivers/usb/gadget/udc/dummy_hcd.c:-1
 __run_hrtimer kernel/time/hrtimer.c:1754 [inline]
 __hrtimer_run_queues+0x525/0xc10 kernel/time/hrtimer.c:1818
 hrtimer_run_softirq+0x177/0x290 kernel/time/hrtimer.c:1835
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 do_softirq+0xfa/0x1a0 kernel/softirq.c:479
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x184/0x1c0 kernel/softirq.c:406
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 batadv_tt_local_purge+0x2c1/0x340 net/batman-adv/translation-table.c:1416
 batadv_tt_purge+0x35/0xa20 net/batman-adv/translation-table.c:3632
 process_one_work kernel/workqueue.c:2657 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
 rescuer_thread+0x71e/0x1080 kernel/workqueue.c:2931
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>