rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=94ac/1/0x4000000000000000 softirq=28524/28525 fqs=40
rcu: 	(detected by 1, t=10504 jiffies, g=23349, q=419 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9797 Comm: syz.4.1094 Not tainted 6.14.0-syzkaller-05884-g2ea396448f26 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:validate_chain+0x11/0x24e0 kernel/locking/lockdep.c:3865
Code: 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 81 ec f8 00 00 00 <48> 89 cb 49 c7 c5 20 60 63 93 65 49 8b 45 00 48 89 84 24 f0 00 00
RSP: 0018:ffffc90000007a20 EFLAGS: 00000082
RAX: ffffffff940c3848 RBX: ffff88805f9d0b40 RCX: 58cce5e7c8d5ebdc
RDX: 0000000000000001 RSI: ffff88805f9d0b40 RDI: ffff88805f9d0000
RBP: 58cce5e7c8d5ebdc R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000004022
R13: ffff88805f9d0000 R14: ffff88805f9d0b60 R15: 0000000000004022
FS:  00007f07d36446c0(0000) GS:ffff888124fea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2d3ea7 CR3: 000000007a992000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 advance_sched+0xa1e/0xca0 net/sched/sch_taprio.c:985
 __run_hrtimer kernel/time/hrtimer.c:1791 [inline]
 __hrtimer_run_queues+0x5a6/0xd40 kernel/time/hrtimer.c:1855
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1917
 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd9/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 2b 00 74 08 4c 89 f7 e8 cd cb 04 f6 f6 44 24 21 02 75 55 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a2 ba 69 f5 65 8b 05 cb 7e 3c 07 85 c0 74 46 48 c7 04 24 0e 36
RSP: 0018:ffffc90003ec6de0 EFLAGS: 00000206
RAX: 4638e6bdec43d500 RBX: 1ffff920007d8dc0 RCX: 0000000000000002
RDX: 0000000000000002 RSI: ffffffff8e67a23d RDI: 0000000000000001
RBP: ffffc90003ec6e70 R08: ffffffff905e4477 R09: 1ffffffff20bc88e
R10: dffffc0000000000 R11: fffffbfff20bc88f R12: 1ffff920007d8dbc
R13: dffffc0000000000 R14: ffffc90003ec6e00 R15: 0000000000000246
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 taprio_change+0x350d/0x44f0 net/sched/sch_taprio.c:1972
 taprio_init+0xa0f/0xcc0 net/sched/sch_taprio.c:2112
 qdisc_create+0x70b/0xdf0 net/sched/sch_api.c:1332
 __tc_modify_qdisc net/sched/sch_api.c:1757 [inline]
 tc_modify_qdisc+0x156d/0x2610 net/sched/sch_api.c:1821
 rtnetlink_rcv_msg+0x7c2/0xd70 net/core/rtnetlink.c:6964
 netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x8c3/0xcd0 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:727
 ____sys_sendmsg+0x523/0x860 net/socket.c:2566
 ___sys_sendmsg net/socket.c:2620 [inline]
 __sys_sendmsg+0x271/0x360 net/socket.c:2652
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f07d278d169
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:00007f07d3644038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f07d29a5fa0 RCX: 00007f07d278d169
RDX: 0000000000000000 RSI: 00002000000007c0 RDI: 0000000000000004
RBP: 00007f07d280e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f07d29a5fa0 R15: 00007ffe26276408
 </TASK>
rcu: rcu_preempt kthread starved for 8479 jiffies! g23349 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:26864 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5366 [inline]
 __schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
 __schedule_loop kernel/sched/core.c:6824 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6839
 schedule_timeout+0x15b/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 9792 Comm: syz.0.1092 Not tainted 6.14.0-syzkaller-05884-g2ea396448f26 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x1bba/0x2d40 kernel/smp.c:885
Code: 01 31 ff e8 b8 02 0c 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 68 fe 0b 00 eb 41 f3 90 48 b8 00 00 00 00 00 fc ff df 0f b6 04 03 <84> c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 43 fe 0b 00 eb db 44
RSP: 0018:ffffc9001b787160 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff110170c820d RCX: ffff888027fa3c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9001b787360 R08: ffffffff81b778e8 R09: 1ffff920036f0e1c
R10: dffffc0000000000 R11: fffff520036f0e1d R12: ffff8880b873ad08
R13: ffff8880b8641068 R14: ffff8880b873ad00 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881250ea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6c9aa1d4bf CR3: 0000000061fcc000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1275 [inline]
 flush_tlb_mm_range+0xb8d/0x13f0 arch/x86/mm/tlb.c:1365
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:481 [inline]
 zap_pte_range mm/memory.c:1768 [inline]
 zap_pmd_range mm/memory.c:1833 [inline]
 zap_pud_range mm/memory.c:1862 [inline]
 zap_p4d_range mm/memory.c:1883 [inline]
 unmap_page_range+0x386f/0x4520 mm/memory.c:1904
 unmap_vmas+0x3ce/0x5f0 mm/memory.c:1994
 exit_mmap+0x2bc/0xdd0 mm/mmap.c:1284
 __mmput+0x115/0x420 kernel/fork.c:1356
 exit_mm+0x221/0x310 kernel/exit.c:586
 do_exit+0x9ad/0x2940 kernel/exit.c:941
 do_group_exit+0x207/0x2c0 kernel/exit.c:1103
 __do_sys_exit_group kernel/exit.c:1114 [inline]
 __se_sys_exit_group kernel/exit.c:1112 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1112
 x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8fb558d169
Code: Unable to access opcode bytes at 0x7f8fb558d13f.
RSP: 002b:00007ffdab7d48c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8fb558d169
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffdab7d492c R08: 00000015ab7d49bf R09: 00000000000927c0
R10: 000000000000017c R11: 0000000000000246 R12: 00000000000000eb
R13: 00000000000927c0 R14: 00000000000323ff R15: 00007ffdab7d4980
 </TASK>