rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6386/1:b..l P50/1:b..l P5829/1:b..l P2928/1:b..l P5836/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=12549, q=1276 ncpus=2)
task:syz-executor    state:R  running task     stack:21608 pid:5836  tgid:5836  ppid:5826   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5263 [inline]
 __schedule+0x1836/0x4ed0 kernel/sched/core.c:6871
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7055
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7079
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 copy_pte_range mm/memory.c:1331 [inline]
 copy_pmd_range+0x7689/0x7fa0 mm/memory.c:1392
 copy_pud_range mm/memory.c:1429 [inline]
 copy_p4d_range mm/memory.c:1453 [inline]
 copy_page_range+0xb88/0x11d0 mm/memory.c:1535
 dup_mmap+0xeed/0x1b00 mm/mmap.c:1825
 dup_mm kernel/fork.c:1488 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1540
 copy_process+0x1663/0x3930 kernel/fork.c:2180
 kernel_clone+0x21e/0x850 kernel/fork.c:2609
 __do_sys_clone kernel/fork.c:2750 [inline]
 __se_sys_clone kernel/fork.c:2734 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2734
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe233785e93
RSP: 002b:00007fffdd8ff4f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe233785e93
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555616fc7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000001ac5a R15: 00007fffdd8ff690
 </TASK>
task:kworker/u8:9    state:R  running task     stack:23112 pid:2928  tgid:2928  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5263 [inline]
 __schedule+0x1836/0x4ed0 kernel/sched/core.c:6871
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7198
 irqentry_exit+0x5b5/0x640 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__rcu_read_unlock+0xc/0xe0 kernel/rcu/tree_plugin.h:431
Code: 48 89 df e8 06 f5 7f 00 eb d2 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 <53> 49 bf 00 00 00 00 00 fc ff df 65 48 8b 3c 25 08 70 76 92 48 8d
RSP: 0018:ffffc9000bc57858 EFLAGS: 00000286
RAX: 11996e5f1eae9800 RBX: 0000000000000078 RCX: 11996e5f1eae9800
RDX: 0000000000000003 RSI: ffffffff8d9761d1 RDI: ffffffff8bbf80e0
RBP: ffffc9000bc579d0 R08: 0000000000000000 R09: ffffffff8b244250
R10: dffffc0000000000 R11: ffffed1006533517 R12: ffff88805dce4dc0
R13: ffff88805dce4dd0 R14: dffffc0000000000 R15: ffff888033e583c0
 rcu_read_unlock include/linux/rcupdate.h:899 [inline]
 batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:778 [inline]
 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:833 [inline]
 batadv_iv_ogm_schedule+0x71a/0xf00 net/batman-adv/bat_iv_ogm.c:873
 batadv_iv_send_outstanding_bat_ogm_packet+0x6c6/0x7e0 net/batman-adv/bat_iv_ogm.c:1709
 process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
 process_scheduled_works kernel/workqueue.c:3344 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
task:syz-executor    state:R  running task     stack:20760 pid:5829  tgid:5829  ppid:5825   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5263 [inline]
 __schedule+0x1836/0x4ed0 kernel/sched/core.c:6871
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7055
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7079
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 copy_pte_range mm/memory.c:1331 [inline]
 copy_pmd_range+0x7689/0x7fa0 mm/memory.c:1392
 copy_pud_range mm/memory.c:1429 [inline]
 copy_p4d_range mm/memory.c:1453 [inline]
 copy_page_range+0xb88/0x11d0 mm/memory.c:1535
 dup_mmap+0xeed/0x1b00 mm/mmap.c:1825
 dup_mm kernel/fork.c:1488 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1540
 copy_process+0x1663/0x3930 kernel/fork.c:2180
 kernel_clone+0x21e/0x850 kernel/fork.c:2609
 __do_sys_clone kernel/fork.c:2750 [inline]
 __se_sys_clone kernel/fork.c:2734 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2734
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fae66185e93
RSP: 002b:00007fffdc9cc708 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fae66185e93
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555871ac7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 000000000001a59f R15: 00007fffdc9cc8a0
 </TASK>
task:kworker/u8:3    state:R  running task     stack:23240 pid:50    tgid:50    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound macvlan_process_broadcast
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5263 [inline]
 __schedule+0x1836/0x4ed0 kernel/sched/core.c:6871
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7198
 irqentry_exit+0x5b5/0x640 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:124 [inline]
RIP: 0010:lock_acquire+0xa9/0x350 kernel/locking/lockdep.c:5844
Code: e8 bc b1 89 00 83 3d 75 ab df 0d 00 0f 84 fa 00 00 00 65 8b 05 78 45 d8 10 85 c0 0f 85 eb 00 00 00 65 48 8b 04 25 08 70 76 92 <83> b8 2c 0b 00 00 00 0f 85 d5 00 00 00 48 c7 44 24 30 00 00 00 00
RSP: 0018:ffffc90000bb73b8 EFLAGS: 00000246
RAX: ffff88802069db80 RBX: 0000000000000000 RCX: b66f361f0afc1200
RDX: 0000000000000000 RSI: ffffffff81742012 RDI: 1ffffffff1be7b38
RBP: ffffffff81741ff5 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90000bb7578 R11: ffffffff81ada5d0 R12: 0000000000000002
R13: ffffffff8df3d9c0 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
 unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6663 [inline]
 kmem_cache_free+0x197/0x640 mm/slub.c:6774
 macvlan_process_broadcast+0x586/0x660 drivers/net/macvlan.c:344
 process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
 process_scheduled_works kernel/workqueue.c:3344 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
task:modprobe        state:R  running task     stack:24488 pid:6386  tgid:6386  ppid:6042   task_flags:0x40000c flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5263 [inline]
 __schedule+0x1836/0x4ed0 kernel/sched/core.c:6871
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7198
 irqentry_exit+0x5b5/0x640 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x1813/0x2390 arch/x86/kernel/unwind_orc.c:665
Code: 8b 84 24 84 00 00 00 41 39 06 4c 8b 7c 24 48 48 8b 7c 24 70 0f 85 54 01 00 00 48 8b 44 24 58 80 3c 28 00 74 05 e8 1d 15 b4 00 <4d> 8b 66 38 49 8d 7e 08 48 89 f8 48 c1 e8 03 80 3c 28 00 74 05 e8
RSP: 0018:ffffc9000bfcf3d8 EFLAGS: 00000246
RAX: 1ffff920017f9ea8 RBX: ffffffff900cb001 RCX: 0000000000000001
RDX: ffffc9000bfcf548 RSI: dffffc0000000000 RDI: ffffc9000bfcf540
RBP: dffffc0000000000 R08: ffffc9000bfcf4f8 R09: 0000000000000000
R10: ffffc9000bfcf558 R11: fffff520017f9ead R12: ffffc9000bfcf4f8
R13: ffffc9000bfcf558 R14: ffffc9000bfcf508 R15: ffffffff81741ff5
 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 __call_rcu_common kernel/rcu/tree.c:3123 [inline]
 call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3243
 slab_free_hook mm/slub.c:2504 [inline]
 slab_free mm/slub.c:6663 [inline]
 kmem_cache_free+0x4a2/0x640 mm/slub.c:6774
 exit_mmap+0x52c/0xb40 mm/mmap.c:1302
 __mmput+0x118/0x430 kernel/fork.c:1132
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x650/0x2300 kernel/exit.c:958
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1111
 __do_sys_exit_group kernel/exit.c:1122 [inline]
 __se_sys_exit_group kernel/exit.c:1120 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1120
 x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f223e80a6c5
RSP: 002b:00007ffdbf3002e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f223e90bfe8 RCX: 00007f223e80a6c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007ffdbf300278 R09: 0000000000000000
R10: 00007ffdbf300110 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f223e90a680 R15: 00007f223e90c000
 </TASK>
rcu: rcu_preempt kthread starved for 10667 jiffies! g12549 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:27360 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5263 [inline]
 __schedule+0x1836/0x4ed0 kernel/sched/core.c:6871
 __schedule_loop kernel/sched/core.c:6953 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6968
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </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 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 33 00 0d 00 f3 0f 1e fa fb f4 <e9> 48 f1 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6
RAX: d4edc3d4f7999a00 RBX: ffffffff81978747 RCX: d4edc3d4f7999a00
RDX: 0000000000000001 RSI: ffffffff8d78f926 RDI: ffffffff8bbf80e0
RBP: ffffc90000197f10 R08: ffff8880b87336db R09: 1ffff110170e66db
R10: dffffc0000000000 R11: ffffed10170e66dc R12: ffffffff8f7deb70
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff110039dcb70
FS:  0000000000000000(0000) GS:ffff888125fb9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000f000 CR3: 0000000079252000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:190 [inline]
 do_idle+0x1e7/0x510 kernel/sched/idle.c:330
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x147
 </TASK>