rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=dc7/1/0x4000000000000000 softirq=6732/6732 fqs=0 
	(detected by 0, t=10504 jiffies, g=7461, q=390)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4303 Comm: syz.2.8 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
Code: 02 00 00 41 0f 94 c1 4c 89 e7 8b 74 24 1c 89 da 48 8b 4c 24 28 4c 8b 44 24 30 6a 00 6a 00 ff 75 10 ff 74 24 38 e8 a2 03 00 00 <48> 83 c4 20 48 c7 c7 80 3e 2b 8a e8 e2 0d 5d 08 b8 ff ff ff ff 65
RSP: 0018:ffffc90000dd0b20 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff815cf12c
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901cb0c0
RBP: ffffc90000dd0c48 R08: dffffc0000000000 R09: 1ffffffff2039618
R10: dffffc0000000000 R11: fffffbfff2039619 R12: ffffffff9651fb18
R13: 1ffff920001ba174 R14: 0000000000000046 R15: dffffc0000000000
FS:  00007fb9e23526c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000012c0 CR3: 0000000073499000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x63/0x380 lib/debugobjects.c:749
 debug_hrtimer_deactivate kernel/time/hrtimer.c:415 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1653 [inline]
 __hrtimer_run_queues+0x2c0/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x397/0x8b0 kernel/time/hrtimer.c:1811
 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+0x9b/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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 8f 04 8f f7 65 8b 05 a0 2b 3f 76 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc900032ced40 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: 39170601bb1e6800
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000000001
RBP: ffffc900032cedd0 R08: ffffffff901cb18f R09: 1ffffffff2039631
R10: dffffc0000000000 R11: fffffbfff2039632 R12: dffffc0000000000
R13: 0000000000000003 R14: ffff88807ca59ae8 R15: 1ffff92000659da8
 spin_unlock_irqrestore include/linux/spinlock.h:419 [inline]
 taprio_change+0x4398/0x52d0 net/sched/sch_taprio.c:1589
 qdisc_create+0x7e4/0x11a0 net/sched/sch_api.c:1255
 tc_modify_qdisc+0xae1/0x17d0 net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0x82c/0xf00 net/core/rtnetlink.c:5688
 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2512
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1923
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2500
 __sys_sendmsg net/socket.c:2529 [inline]
 __do_sys_sendmsg net/socket.c:2538 [inline]
 __se_sys_sendmsg+0x1b7/0x2a0 net/socket.c:2536
 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: 0033:0x7fb9e40f8e59
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:00007fb9e2352028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb9e4371fa0 RCX: 00007fb9e40f8e59
RDX: 0000000000000010 RSI: 00002000000012c0 RDI: 0000000000000004
RBP: 00007fb9e418ee6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb9e4372038 R14: 00007fb9e4371fa0 R15: 00007fff18178de8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10503 jiffies! g7461 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=4013
rcu: rcu_preempt kthread starved for 10504 jiffies! g7461 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:27440 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11f0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9a/0x370 kernel/rcu/tree.c:2145
 kthread+0x42e/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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4303 Comm: syz.2.8 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:101 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x65/0x290 mm/kasan/generic.c:189
Code: ff df 49 89 fe 49 c1 ee 03 49 ba 00 00 00 00 00 fc ff df 4f 8d 1c 16 4c 8d 44 3e ff 4d 89 c1 49 c1 e9 03 4b 8d 1c 21 49 89 df <4d> 29 df 49 83 ff 10 7f 29 4d 85 ff 0f 84 38 01 00 00 4c 89 cb 48
RSP: 0018:ffffc90000dd0c88 EFLAGS: 00000807
RAX: 1ffff1100f94b301 RBX: ffffed100f94b36b RCX: ffffffff8405d18f
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffff88807ca59b48
RBP: 0000000000000000 R08: ffff88807ca59b57 R09: 1ffff1100f94b36a
R10: dffffc0000000000 R11: ffffed100f94b369 R12: dffffc0000000001
R13: dffffc0000000000 R14: 1ffff1100f94b369 R15: ffffed100f94b36b
FS:  00007fb9e23526c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000012c0 CR3: 0000000073499000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 memset+0x1e/0x40 mm/kasan/shadow.c:44
 rb_link_node include/linux/rbtree.h:63 [inline]
 rb_add_cached include/linux/rbtree.h:182 [inline]
 timerqueue_add+0x13f/0x1f0 lib/timerqueue.c:40
 enqueue_hrtimer+0x19b/0x370 kernel/time/hrtimer.c:1077
 __run_hrtimer kernel/time/hrtimer.c:1702 [inline]
 __hrtimer_run_queues+0x5ed/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x397/0x8b0 kernel/time/hrtimer.c:1811
 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+0x9b/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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 8f 04 8f f7 65 8b 05 a0 2b 3f 76 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc900032ced40 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: 39170601bb1e6800
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000000001
RBP: ffffc900032cedd0 R08: ffffffff901cb18f R09: 1ffffffff2039631
R10: dffffc0000000000 R11: fffffbfff2039632 R12: dffffc0000000000
R13: 0000000000000003 R14: ffff88807ca59ae8 R15: 1ffff92000659da8
 spin_unlock_irqrestore include/linux/spinlock.h:419 [inline]
 taprio_change+0x4398/0x52d0 net/sched/sch_taprio.c:1589
 qdisc_create+0x7e4/0x11a0 net/sched/sch_api.c:1255
 tc_modify_qdisc+0xae1/0x17d0 net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0x82c/0xf00 net/core/rtnetlink.c:5688
 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2512
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1923
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2500
 __sys_sendmsg net/socket.c:2529 [inline]
 __do_sys_sendmsg net/socket.c:2538 [inline]
 __se_sys_sendmsg+0x1b7/0x2a0 net/socket.c:2536
 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: 0033:0x7fb9e40f8e59
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:00007fb9e2352028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb9e4371fa0 RCX: 00007fb9e40f8e59
RDX: 0000000000000010 RSI: 00002000000012c0 RDI: 0000000000000004
RBP: 00007fb9e418ee6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb9e4372038 R14: 00007fb9e4371fa0 R15: 00007fff18178de8
 </TASK>