rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10506 jiffies, g=56993, q=256 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10506 (4295003383-4294992877), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10506 jiffies! g56993 f0x2 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:27592 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7326
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11510 Comm: syz.1.1347 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:netdev_get_num_tc include/linux/netdevice.h:2682 [inline]
RIP: 0010:advance_sched+0xb3/0xd20 net/sched/sch_taprio.c:924
Code: c1 ea 03 80 3c 02 00 0f 85 48 0b 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6d 00 48 8d 7d 36 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 8c 0a 00 00 0f
RSP: 0018:ffffc90000a08de8 EFLAGS: 00000807
RAX: dffffc0000000000 RBX: ffff88807ee5b300 RCX: ffff88807ee5b280
RDX: 0000000000000000 RSI: ffffffff89c75e7e RDI: ffff88807e864036
RBP: ffff88807e864000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807ee5b300
R13: ffffffff89c75e60 R14: ffff8880b8528640 R15: ffff8880b8528690
FS:  00007f2c933986c0(0000) GS:ffff888123ee6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c93397ff8 CR3: 00000000373ea000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data+0x0/0x90 kernel/kcov.c:246
Code: 6d fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <65> 8b 05 d9 ca 59 12 49 89 f8 49 89 f1 49 89 d2 65 48 8b 3d b0 ca
RSP: 0018:ffffc900044a7d38 EFLAGS: 00000202
RAX: 0000000000000002 RBX: 0000000000000008 RCX: ffffffff81fc3c94
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000005
RBP: ffffffff8bd38e40 R08: 0000000000000005 R09: 0000000000000007
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 000000000000000d R14: 0000000000000005 R15: 0000000000000001
 __sanitizer_cov_trace_switch+0x54/0x90 kernel/kcov.c:351
 do_futex+0x204/0x440 kernel/futex/syscalls.c:128
 __do_sys_futex kernel/futex/syscalls.c:210 [inline]
 __se_sys_futex kernel/futex/syscalls.c:191 [inline]
 __x64_sys_futex+0x34f/0x4d0 kernel/futex/syscalls.c:191
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2c9259de99
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:00007f2c933980e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f2c92825fa8 RCX: 00007f2c9259de99
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f2c92825fac
RBP: 00007f2c92825fa0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2c92826038 R14: 00007ffc3b011760 R15: 00007ffc3b011848
 </TASK>