rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10497 ticks this GP) idle=b784/1/0x4000000000000000 softirq=29716/29716 fqs=4182
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1326720          0            0
rcu: 	cputime:    18584      33905           67   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=33317 q=1751 ncpus=2)
CPU: 1 PID: 9895 Comm: syz.0.1212 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:slab_alloc_node mm/slub.c:3473 [inline]
RIP: 0010:kmem_cache_alloc_node+0x38/0x320 mm/slub.c:3540
Code: 48 83 ec 28 89 54 24 04 41 89 f6 49 89 ff 65 48 8b 04 25 28 00 00 00 48 89 44 24 20 48 8b 44 24 58 48 89 44 24 08 44 8b 6f 1c <48> c7 44 24 18 00 00 00 00 48 c7 44 24 10 00 00 00 00 31 db 48 8d
RSP: 0018:ffffc900001f08b8 EFLAGS: 00000296
RAX: ffffffff88721573 RBX: 0000000000000000 RCX: ffff88801fee8000
RDX: 00000000ffffffff RSI: 0000000000020820 RDI: ffff88801ea53640
RBP: 00000000ffffffff R08: dffffc0000000000 R09: 1ffffffff2237ea0
R10: dffffc0000000000 R11: fffffbfff2237ea1 R12: 0000000000020820
R13: 00000000000000f0 R14: 0000000000020820 R15: ffff88801ea53640
FS:  00007f3dd96e96c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 00000000253ce000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __alloc_skb+0x103/0x2c0 net/core/skbuff.c:643
 __netdev_alloc_skb+0x10c/0x500 net/core/skbuff.c:717
 netdev_alloc_skb include/linux/skbuff.h:3272 [inline]
 dev_alloc_skb include/linux/skbuff.h:3285 [inline]
 hsr_init_skb+0xdc/0x580 net/hsr/hsr_device.c:266
 send_hsr_supervision_frame+0x140/0xb90 net/hsr/hsr_device.c:309
 hsr_announce+0x198/0x350 net/hsr/hsr_device.c:402
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 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+0xd3/0x190 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:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5255
Code: 0f 84 33 01 00 00 48 85 db 0f 85 52 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 f0 a3 30 09 e8 8b 22 30 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc9000d277878 EFLAGS: 00000286
RAX: ff71cb6ff6192500 RBX: 0000000000000000 RCX: ff71cb6ff6192500
RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: ffffffff8b1c81e0
RBP: ffffc9000d2778d0 R08: ffffffff8e8add6f R09: 1ffffffff1d15bad
R10: dffffc0000000000 R11: fffffbfff1d15bae R12: ffff88801fee8000
R13: dffffc0000000000 R14: ffff88802fd5da00 R15: ffff8880b8f3cac8
 context_switch kernel/sched/core.c:5384 [inline]
 __schedule+0x155b/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 futex_wait_queue+0x138/0x1b0 kernel/futex/waitwake.c:355
 futex_wait+0x1ec/0x5e0 kernel/futex/waitwake.c:656
 do_futex+0x2ff/0x3e0 kernel/futex/syscalls.c:134
 __do_sys_futex kernel/futex/syscalls.c:211 [inline]
 __se_sys_futex+0x3a9/0x440 kernel/futex/syscalls.c:192
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3dd879bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3dd96e90e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f3dd8a15fa8 RCX: 00007f3dd879bf79
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3dd8a15fa8
RBP: 00007f3dd8a15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3dd8a16038 R14: 00007fff87230dc0 R15: 00007fff87230ea8
 </TASK>