rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P10902/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=66609, q=139 ncpus=2)
task:syz.5.1041      state:R  running task     stack:28200 pid:10902 ppid:8717   flags:0x00004000
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:__sanitizer_cov_trace_pc+0x54/0x60 kernel/kcov.c:230
Code: 16 00 00 00 74 2c 8b 91 f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 <48> 89 3a 48 89 44 f2 08 c3 0f 1f 00 f3 0f 1e fa 48 8b 04 24 65 48
RSP: 0018:ffffc90004f6f830 EFLAGS: 00000283
RAX: ffffffff89b4ee19 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc90010826000 RSI: 00000000000072f7 RDI: 00000000000072f8
RBP: 0000000000000000 R08: ffff888026c31e00 R09: 0000000000000002
R10: 000000000000000a R11: 0000000000000002 R12: ffffffff8e1dbf30
R13: ffff88805d04fbbd R14: ffff88807a6bc088 R15: ffff88805d04f200
 sctp_bind_addr_state+0x109/0x1a0 net/sctp/bind_addr.c:410
 sctp_copy_local_addr_list+0x2d5/0x4e0 net/sctp/protocol.c:162
 sctp_bind_addr_copy+0xb3/0x3c0 net/sctp/bind_addr.c:56
 sctp_connect_new_asoc+0x2da/0x690 net/sctp/socket.c:1095
 sctp_sendmsg_new_asoc net/sctp/socket.c:1693 [inline]
 sctp_sendmsg+0x155c/0x27e0 net/sctp/socket.c:2004
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x46a/0x620 net/socket.c:2201
 __do_sys_sendto net/socket.c:2213 [inline]
 __se_sys_sendto net/socket.c:2209 [inline]
 __x64_sys_sendto+0xde/0xf0 net/socket.c:2209
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f476938eec9
RSP: 002b:00007f476a1e9038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f47695e6180 RCX: 00007f476938eec9
RDX: 0000000000000002 RSI: 00002000000001c0 RDI: 0000000000000008
RBP: 00007f4769411f91 R08: 0000200000000200 R09: 000000000000001c
R10: 0000000000044001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f47695e6218 R14: 00007f47695e6180 R15: 00007ffec31fd688
 </TASK>
rcu: rcu_preempt kthread starved for 10513 jiffies! g66609 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:27752 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:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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 a3 e8 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:ffffc90000187de0 EFLAGS: 000002c2
RAX: c16af4ac99174d00 RBX: ffffffff8161925b RCX: c16af4ac99174d00
RDX: 0000000000000001 RSI: ffffffff8aaabca0 RDI: ffffffff8afc71c0
RBP: ffffc90000187f20 R08: ffff8880b8f36b2b R09: 1ffff110171e6d65
R10: dffffc0000000000 R11: ffffed10171e6d66 R12: ffffffff8e4a7fe8
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff110037ca780
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34422ff8 CR3: 000000001f767000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 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
 start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
 secondary_startup_64_no_verify+0x179/0x17b
 </TASK>