rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=a1b/1/0x4000000000000002 softirq=9174/9176 fqs=2 
	(detected by 1, t=10502 jiffies, g=10393, q=184)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5070 Comm: syz.1.75 Not tainted 5.15.186-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:rcu_read_lock include/linux/rcupdate.h:740 [inline]
RIP: 0010:__perf_output_begin kernel/events/ring_buffer.c:163 [inline]
RIP: 0010:perf_output_begin_forward+0xc0/0xa30 kernel/events/ring_buffer.c:271
Code: 00 e8 f4 8a 06 08 41 89 c6 31 ff 89 c6 e8 48 ae dc ff 45 85 f6 74 15 e8 6e 84 c8 ff 84 c0 74 18 e8 d5 aa dc ff 4c 8b 74 24 18 <eb> 67 e8 c9 aa dc ff 4c 8b 74 24 18 eb 5b e8 bd 8a 06 08 41 89 c6
RSP: 0018:ffffc90000006f80 EFLAGS: 00000046
RAX: ffffffff819b183b RBX: ffff888022bb1dd8 RCX: ffff88807de9d940
RDX: 0000000000000100 RSI: ffffffff8a59a8e0 RDI: ffffffff8a59a8a0
RBP: ffffc900000070b0 R08: dffffc0000000000 R09: fffffbfff1ff3619
R10: fffffbfff1ff3619 R11: 1ffffffff1ff3618 R12: 1ffff92000000e00
R13: 0000000000000008 R14: ffffc90000007100 R15: ffffc900000072c0
FS:  00007f44ef7546c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000005dd8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __perf_event_output kernel/events/core.c:7790 [inline]
 perf_event_output_forward+0x15c/0x280 kernel/events/core.c:7808
 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9501
 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10033
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10007
 perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:671
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 8d 26 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90000007700 EFLAGS: 00000206
RAX: 1fcb9f68c8c8d400 RBX: 1ffff92000000ee4 RCX: 1fcb9f68c8c8d400
RDX: dffffc0000000000 RSI: ffffffff8a0b11c0 RDI: ffffffff8a59a900
RBP: ffffc900000077e0 R08: dffffc0000000000 R09: fffffbfff1ff3632
R10: fffffbfff1ff3632 R11: 1ffffffff1ff3631 R12: ffffffff8c120400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:771 [inline]
 __ip_queue_xmit+0x1244/0x1c00 net/ipv4/ip_output.c:533
 __tcp_transmit_skb+0x1d2a/0x3410 net/ipv4/tcp_output.c:1404
 tcp_delack_timer_handler+0x32e/0x730 net/ipv4/tcp_timer.c:314
 tcp_delack_timer+0x188/0x2e0 net/ipv4/tcp_timer.c:341
 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:ex_fixup_addr arch/x86/mm/extable.c:28 [inline]
RIP: 0010:ex_handler_default arch/x86/mm/extable.c:39 [inline]
RIP: 0010:ex_handler_uaccess arch/x86/mm/extable.c:76 [inline]
RIP: 0010:fixup_exception+0xab8/0x1330 arch/x86/mm/extable.c:173
Code: f7 e8 cc 21 88 00 49 c7 06 00 00 00 00 48 8b 54 24 18 48 83 c2 04 48 89 d0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 c6 06 00 00 <48> 63 1a 48 01 d3 43 80 3c 2c 00 0f 84 9d 02 00 00 4c 89 ff e8 8f
RSP: 0018:ffffc90003a4faa8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88807de9d940
RDX: ffffffff8bd1f448 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000000000e R08: ffff88807de9d940 R09: 0000000000000011
R10: 0000000000000011 R11: 0000000000000000 R12: 1ffff92000749f9f
R13: dffffc0000000000 R14: ffffc90003a4fc78 R15: ffffc90003a4fcf8
 kernelmode_fixup_or_oops+0x6c/0xd0 arch/x86/mm/fault.c:719
 __bad_area_nosemaphore+0x11c/0x5a0 arch/x86/mm/fault.c:766
 handle_page_fault arch/x86/mm/fault.c:1445 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]
RIP: 0010:strncpy_from_user+0x163/0x360 lib/strncpy_from_user.c:139
Code: 4c 89 e6 e8 4f e3 7c fd 49 83 fc 07 0f 86 a1 00 00 00 4c 89 74 24 08 48 c7 44 24 10 f8 ff ff ff 45 31 ed 4c 89 3c 24 48 89 dd <4f> 8b 3c 2f 48 b8 ff fe fe fe fe fe fe fe 49 8d 1c 07 4d 89 fe 49
RSP: 0018:ffffc90003a4fd28 EFLAGS: 00050246
RAX: ffffffff83fae3a1 RBX: ffff888023ff2220 RCX: ffff88807de9d940
RDX: 0000000000000000 RSI: 0000000000000fe0 RDI: 0000000000000007
RBP: ffff888023ff2220 R08: 0000000000000fe0 R09: 0000000000000020
R10: fffff9400011ff81 R11: 1ffffd400011ff80 R12: 0000000000000fe0
R13: 0000000000000000 R14: 0000000000000fe0 R15: 0000000000000000
 getname_flags+0xef/0x500 fs/namei.c:149
 do_sys_openat2+0xcf/0x4a0 fs/open.c:1247
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1280
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f44f04dbd29
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:00007f44ef754038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f44f06cbfa0 RCX: 00007f44f04dbd29
RDX: 0000000000200002 RSI: 0000000000000000 RDI: ffffffffffffff9c
RBP: 00007f44f0557b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f44f06cbfa0 R15: 00007ffd4311a828
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10496 jiffies! g10393 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=6162
rcu: rcu_preempt kthread starved for 10497 jiffies! g10393 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27848 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1e0 kernel/sched/core.c:6459
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 4710 Comm: kworker/u4:5 Not tainted 5.15.186-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: gid-cache-wq netdevice_event_work_handler
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_check_gp_kthread_starvation+0x1cd/0x250 kernel/rcu/tree_stall.h:487
 print_other_cpu_stall+0x10c8/0x1220 kernel/rcu/tree_stall.h:592
 check_cpu_stall kernel/rcu/tree_stall.h:745 [inline]
 rcu_pending kernel/rcu/tree.c:3932 [inline]
 rcu_sched_clock_irq+0x831/0x1110 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1690 [inline]
 __hrtimer_run_queues+0x4fe/0xc40 kernel/time/hrtimer.c:1754
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1816
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x141/0x190 arch/x86/kernel/kvm.c:918
Code: 89 df 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 47 0f b6 1f e8 4f e9 49 00 44 38 e3 75 10 66 90 0f 00 2d 21 6f d4 08 fb f4 <e9> 33 ff ff ff fb e9 2d ff ff ff e8 5f a5 6d 08 89 f9 80 e1 07 38
RSP: 0018:ffffc90000dd08c0 EFLAGS: 00000246
RAX: ffe090adfcd94000 RBX: 0000000000000003 RCX: ffe090adfcd94000
RDX: dffffc0000000000 RSI: ffffffff8a0b11c0 RDI: ffffffff8a59a900
RBP: ffffc90000dd0970 R08: dffffc0000000000 R09: fffffbfff1ff3632
R10: fffffbfff1ff3632 R11: 1ffffffff1ff3631 R12: 0000000000000003
R13: ffff8880b913b114 R14: dffffc0000000000 R15: 1ffff920001ba118
 pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x60f/0x9c0 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock+0x217/0x280 kernel/locking/spinlock_debug.c:115
 spin_lock include/linux/spinlock.h:363 [inline]
 tcp_write_timer+0x29/0x280 net/ipv4/tcp_timer.c:673
 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x1f2/0x3f0 kernel/locking/lockdep.c:5627
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f6 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b
RSP: 0018:ffffc9000340f9e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffe090adfcd94000
RDX: 0000000000000000 RSI: ffffffff8a0b2460 RDI: ffffffff8a59a900
RBP: ffffc9000340faf0 R08: dffffc0000000000 R09: fffffbfff1ff3620
R10: fffffbfff1ff3620 R11: 1ffffffff1ff361f R12: ffffffff8d018870
R13: 1ffff92000681f48 R14: 0000000000000246 R15: dffffc0000000000
 down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498
 ib_enum_all_roce_netdevs+0x89/0x160 drivers/infiniband/core/device.c:2345
 netdevice_event_work_handler+0x247/0x540 drivers/infiniband/core/roce_gid_mgmt.c:627
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>