rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=ad94/1/0x4000000000000000 softirq=70658/70658 fqs=0
rcu: 	(detected by 1, t=10505 jiffies, g=77321, q=1830 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15826 Comm: syz.0.3095 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:hlock_class kernel/locking/lockdep.c:230 [inline]
RIP: 0010:mark_lock+0xa2/0x360 kernel/locking/lockdep.c:4729
Code: 00 8b 1b 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 40 38 2c 94 be 08 00 00 00 e8 36 30 88 00 48 0f a3 1d 7e fb 90 12 <73> 10 48 69 c3 c8 00 00 00 48 8d 98 00 b7 c3 93 eb 68 48 c7 c0 80
RSP: 0018:ffffc900000079c8 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000e4f RCX: ffffffff819b3cba
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff942c3a08
RBP: 0000000000000000 R08: ffffffff942c3a0f R09: 1ffffffff2858741
R10: dffffc0000000000 R11: fffffbfff2858742 R12: ffff88807d118ad4
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88807d118b18
FS:  00007f494eac16c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2500c2 CR3: 000000007f2ca000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 mark_usage kernel/locking/lockdep.c:4637 [inline]
 __lock_acquire+0xbc3/0x2100 kernel/locking/lockdep.c:5182
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0xab/0xca0 net/sched/sch_taprio.c:924
 __run_hrtimer kernel/time/hrtimer.c:1738 [inline]
 __hrtimer_run_queues+0x59b/0xd30 kernel/time/hrtimer.c:1802
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1864
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__genradix_ptr_alloc+0x27f/0x500
Code: b6 fe ff ff e8 a2 ab de fc 48 8b 44 24 20 e9 1c ff ff ff 31 ff 44 89 f6 e8 ce af de fc 45 85 f6 0f 84 10 02 00 00 48 89 1c 24 <83> 7c 24 10 00 b8 02 00 00 00 48 0f 44 44 24 28 48 89 44 24 10 41
RSP: 0018:ffffc9000c487818 EFLAGS: 00000202
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffff88807d118000
RDX: ffff88807d118000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000011 R08: ffffffff84e0b0e2 R09: 1ffff11006a049be
R10: dffffc0000000000 R11: ffffed1006a049bf R12: ffff88807da44002
R13: 0000000000000015 R14: 0000000000000002 R15: ffff88807da44000
 __genradix_prealloc+0x45/0x90 lib/generic-radix-tree.c:216
 sctp_stream_alloc_out net/sctp/stream.c:104 [inline]
 sctp_stream_init+0x165/0x460 net/sctp/stream.c:149
 sctp_association_init net/sctp/associola.c:232 [inline]
 sctp_association_new+0x10c7/0x2400 net/sctp/associola.c:296
 sctp_connect_new_asoc+0x2d8/0x6c0 net/sctp/socket.c:1091
 sctp_sendmsg_new_asoc net/sctp/socket.c:1693 [inline]
 sctp_sendmsg+0x219a/0x3520 net/sctp/socket.c:2004
 sock_sendmsg_nosec net/socket.c:713 [inline]
 __sock_sendmsg+0x1a6/0x270 net/socket.c:728
 __sys_sendto+0x363/0x4c0 net/socket.c:2182
 __do_sys_sendto net/socket.c:2189 [inline]
 __se_sys_sendto net/socket.c:2185 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2185
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f494db8cda9
Code: 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 01 48
RSP: 002b:00007f494eac1038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f494dda5fa0 RCX: 00007f494db8cda9
RDX: 0000000000000001 RSI: 00000000200004c0 RDI: 0000000000000007
RBP: 00007f494dc0e2a0 R08: 0000000020000100 R09: 000000000000001c
R10: 0000000000040050 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f494dda5fa0 R15: 00007ffdd06c7c18
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g77321 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=67161
rcu: rcu_preempt kthread starved for 10505 jiffies! g77321 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26104 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0x18bc/0x4c40 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6856
 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>