rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=91029, q=162 ncpus=2)
task:kworker/u4:1    state:R  running task     stack:21512 pid:12    ppid:2      flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:815 [inline]
RIP: 0010:batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
RIP: 0010:batadv_nc_worker+0x203/0x610 net/batman-adv/network-coding.c:719
Code: 10 48 81 c5 38 fe ff ff 74 07 e8 78 a5 4e f7 eb b8 e8 71 a5 4e f7 e8 fc c4 37 00 89 c3 31 ff 89 c6 e8 11 a9 4e f7 85 db 74 15 <e8> 18 af 38 f7 84 c0 74 18 e8 4f a5 4e f7 48 8b 5c 24 08 eb 65 e8
RSP: 0018:ffffc90000117b60 EFLAGS: 00000202
RAX: ffffffff8a36e9ff RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff888019e75a00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: fffffffffffffe38 R08: dffffc0000000000 R09: 1ffffffff21b4ea0
R10: dffffc0000000000 R11: fffffbfff21b4ea1 R12: dffffc0000000000
R13: ffffffff8a36e8d2 R14: ffff88802fdd4c80 R15: 00000000000003dc
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 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: rcu_preempt kthread starved for 10324 jiffies! g91029 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:27216 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:102 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:233 [inline]
RIP: 0010:unwind_next_frame+0x59e/0x2970 arch/x86/kernel/unwind_orc.c:494
Code: 04 28 84 c0 75 3e 4d 63 2f 4d 01 fd 4c 89 ef 4c 89 f6 e8 a5 e8 4a 00 49 8d 47 04 4d 39 f5 48 0f 46 d8 49 8d 47 fc 48 0f 47 e8 <4d> 0f 46 e7 48 39 eb 77 28 e8 74 e6 4a 00 49 bd 00 00 00 00 00 fc
RSP: 0018:ffffc90000007378 EFLAGS: 00000012
RAX: ffffffff8ec667ac RBX: ffffffff8ec4a2dc RCX: ffffffff8ca93440
RDX: 0000000000000002 RSI: ffffffff8f9c76dd RDI: ffffffff8fa12285
RBP: ffffffff8ec667ac R08: ffffc90000007510 R09: 0000000000000014
R10: dffffc0000000000 R11: fffffbfff1c9514e R12: ffffffff8ec4a2d8
R13: ffffffff8fa12285 R14: ffffffff8f9c76dd R15: ffffffff8ec667b0
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056510beeb950 CR3: 000000002421d000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383
 kmalloc include/linux/slab.h:600 [inline]
 dummy_urb_enqueue+0x7c/0x780 drivers/usb/gadget/udc/dummy_hcd.c:1272
 usb_hcd_submit_urb+0x313/0x1a90 drivers/usb/core/hcd.c:1535
 iowarrior_callback+0x4b9/0x6a0 drivers/usb/misc/iowarrior.c:213
 __usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650
 dummy_timer+0x8a3/0x31b0 drivers/usb/gadget/udc/dummy_hcd.c:1993
 __run_hrtimer kernel/time/hrtimer.c:1750 [inline]
 __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1814
 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1831
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:148
Code: cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d c3 89 39 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 66 0f 1f 00 55 41 57 41 56
RSP: 0018:ffffffff8ca07d80 EFLAGS: 000002c2
RAX: dfdd85aea53a1300 RBX: ffffffff8161877b RCX: dfdd85aea53a1300
RDX: 0000000000000001 RSI: ffffffff8aaabd60 RDI: ffffffff8afc67c0
RBP: ffffffff8ca07eb8 R08: ffff8880b8e36b2b R09: 1ffff110171c6d65
R10: dffffc0000000000 R11: ffffed10171c6d66 R12: ffffffff8e4a8a68
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1952688
 arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:753
 default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
 cpuidle_idle_call kernel/sched/idle.c:170 [inline]
 do_idle+0x1eb/0x510 kernel/sched/idle.c:282
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:380
 rest_init+0x2e2/0x300 init/main.c:744
 arch_call_rest_init+0xe/0x10 init/main.c:841
 start_kernel+0x459/0x4e0 init/main.c:1086
 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
 x86_64_start_kernel+0x60/0x60 arch/x86/kernel/head64.c:536
 secondary_startup_64_no_verify+0x179/0x17b
 </TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 13028 Comm: syz.2.2044 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:memcpy_orig+0x1e/0x120 arch/x86/lib/memcpy_64.S:65
Code: eb 0a 48 89 f8 48 89 d1 f3 a4 c3 90 66 0f 1f 00 48 89 f8 48 83 fa 20 0f 82 86 00 00 00 40 38 fe 7c 35 48 83 ea 20 48 83 ea 20 <4c> 8b 06 4c 8b 4e 08 4c 8b 56 10 4c 8b 5e 18 48 8d 76 20 4c 89 07
RSP: 0018:ffffc9000425fbd0 EFLAGS: 00000087
RAX: ffffc9000425fe00 RBX: 0000000000000011 RCX: ffffffff815365ed
RDX: fffffffffffffff0 RSI: ffff88802db2df68 RDI: ffffc9000425fe00
RBP: ffff88802db2df50 R08: ffffc9000425fe2f R09: 1ffff9200084bfc5
R10: dffffc0000000000 R11: fffff5200084bfc6 R12: ffffc9000425fe00
R13: 1ffff110043661c1 R14: dffffc0000000000 R15: ffff888021b30df8
FS:  00005555903e2500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f11c39a2f98 CR3: 000000002ef8c000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 copy_siginfo include/linux/signal.h:17 [inline]
 collect_signal kernel/signal.c:597 [inline]
 __dequeue_signal+0x3bd/0x680 kernel/signal.c:626
 dequeue_signal+0xe9/0x4b0 kernel/signal.c:649
 get_signal+0x551/0x1400 kernel/signal.c:2782
 arch_do_signal_or_restart+0x9c/0x7b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f11c2a558d3
Code: 54 24 08 48 85 d2 74 17 8b 44 24 18 0f c8 89 c0 48 89 44 24 18 48 83 fa 01 0f 85 b3 01 00 00 48 8b 44 24 10 8b 54 24 18 89 10 <e9> 15 fd ff ff 48 8b 44 24 10 8b 10 48 8b 44 24 08 48 85 c0 0f 84
RSP: 002b:00007ffe41b7d590 EFLAGS: 00000246
RAX: 000020000000cffc RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00005555903e23c8
RBP: 00007ffe41b7d698 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00007f11c2de5fac
R13: 00007ffe41b7d6c0 R14: fffffffffffffffe R15: 00007ffe41b7d6e0
 </TASK>