rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=138749, q=956 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4295095521-4295085021), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10500 jiffies! g138749 f0x2 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:27544 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1821/0x5740 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7283
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x389/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 UID: 0 PID: 22578 Comm: syz.0.4116 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:advance_sched+0x1e5/0xc20 net/sched/sch_taprio.c:-1
Code: c0 be ff ff ff ff e8 aa 52 f0 01 89 c5 31 ff 89 c6 e8 6f b5 0c f8 85 ed 0f 84 16 06 00 00 e8 22 b1 0c f8 eb 05 e8 1b b1 0c f8 <48> bd 00 00 00 00 00 fc ff df 48 8b 04 24 48 83 c0 f8 48 89 c1 48
RSP: 0018:ffffc90000007d10 EFLAGS: 00000006
RAX: ffffffff89b904be RBX: ffff88807b503800 RCX: ffff88805ee78000
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f90 R12: ffff88805ee78b78
R13: ffff888058a33000 R14: ffff88802a988000 R15: ffff888058a332f0
FS:  00007f78ae27e6c0(0000) GS:ffff888125287000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f78ae27dff8 CR3: 000000009bb7b000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1930 [inline]
 __hrtimer_run_queues+0x3c0/0xa20 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__put_user_nocheck_8+0x3/0x10 arch/x86/lib/putuser.S:128
Code: d9 0f 01 cb 48 89 01 31 c9 0f 01 ca e9 51 7a 67 f5 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 01 cb <48> 89 01 31 c9 0f 01 ca e9 2b 7a 67 f5 0f 01 ca b9 f2 ff ff ff e9
RSP: 0018:ffffc90005a478b8 EFLAGS: 00040202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000200000150f68
RDX: ffffc90021d4a000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90005a47a30 R08: ffffc90005a47687 R09: 1ffff92000b48ed0
R10: dffffc0000000000 R11: fffff52000b48ed1 R12: 1ffff92000b48f24
R13: 0000000000000000 R14: 0000200000150f68 R15: dffffc0000000000
 ____sys_recvmsg+0x32a/0x4a0 net/socket.c:2939
 ___sys_recvmsg+0x215/0x590 net/socket.c:2960
 do_recvmmsg+0x334/0x800 net/socket.c:3055
 __sys_recvmmsg net/socket.c:3129 [inline]
 __do_sys_recvmmsg net/socket.c:3152 [inline]
 __se_sys_recvmmsg net/socket.c:3145 [inline]
 __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3145
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f78ad39ce59
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:00007f78ae27e028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f78ad616090 RCX: 00007f78ad39ce59
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000006
RBP: 00007f78ad432d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f78ad616128 R14: 00007f78ad616090 R15: 00007ffe2aeb6b98
 </TASK>