rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=376c/1/0x4000000000000000 softirq=77285/77285 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P17248/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=56001, q=85 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 17251 Comm: syz.5.3000 Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__kasan_check_byte+0x2f/0x40 mm/kasan/common.c:561
Code: 57 41 56 53 49 89 f6 49 89 ff e8 9c 17 00 00 89 c3 84 c0 75 12 be 01 00 00 00 4c 89 ff 31 d2 4c 89 f1 e8 a4 09 00 00 89 d8 5b <41> 5e 41 5f e9 83 75 e3 fe cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc90000a08aa8 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffffffff9a9cc5f0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8c326e68 RDI: 1ffffffff35398be
RBP: ffffffff93686020 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff5200014118a R12: 0000000000000001
R13: 0000000000000000 R14: ffffffff8c326e68 R15: ffffffff9a9cc5f0
FS:  00007f7efbcd96c0(0000) GS:ffff88812509a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3d878f CR3: 000000005c27a000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 kasan_check_byte include/linux/kasan.h:399 [inline]
 lock_acquire+0x89/0x2f0 kernel/locking/lockdep.c:5840
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd8/0x130 kernel/locking/spinlock.c:162
 debug_object_activate+0x190/0x5c0 lib/debugobjects.c:818
 debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline]
 debug_activate kernel/time/hrtimer.c:484 [inline]
 enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1088
 __run_hrtimer kernel/time/hrtimer.c:1778 [inline]
 __hrtimer_run_queues+0x6d6/0xd40 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x420 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:console_flush_all+0x998/0xec0 arch/x86/include/asm/irqflags.h:-1
Code: 48 21 c3 0f 85 16 02 00 00 e8 24 e5 20 00 4c 8b 7c 24 10 4d 85 f6 75 07 e8 15 e5 20 00 eb 06 e8 0e e5 20 00 fb 48 8b 5c 24 18 <48> 8b 44 24 30 42 80 3c 28 00 74 08 48 89 df e8 d4 1e 8b 00 4c 8b
RSP: 0018:ffffc9001e1a6a20 EFLAGS: 00000287
RAX: ffffffff81a1d812 RBX: ffffffff8f5a1f98 RCX: 0000000000080000
RDX: ffffc9000d9c7000 RSI: 0000000000003e21 RDI: 0000000000003e22
RBP: ffffc9001e1a6bd0 R08: ffffffff81a1d7e9 R09: 1ffffffff20bfcae
R10: dffffc0000000000 R11: fffffbfff20bfcaf R12: ffffffff8f5a1f40
R13: dffffc0000000000 R14: 0000000000000200 R15: ffffc9001e1a6c20
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0x151/0x3b0 kernel/printk/printk.c:3325
 vprintk_emit+0x761/0xa40 kernel/printk/printk.c:2450
 _printk+0xd5/0x120 kernel/printk/printk.c:2475
 validate_nla lib/nlattr.c:414 [inline]
 __nla_validate_parse+0x1bf9/0x32e0 lib/nlattr.c:635
 __nla_parse+0x40/0x60 lib/nlattr.c:732
 __nlmsg_parse include/net/netlink.h:765 [inline]
 nlmsg_parse_deprecated include/net/netlink.h:806 [inline]
 rtnl_setlink+0x1b5/0xc00 net/core/rtnetlink.c:3437
 rtnetlink_rcv_msg+0x811/0xd70 net/core/rtnetlink.c:6955
 netlink_rcv_skb+0x20a/0x480 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x7fa/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+0x223/0x270 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+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7efad8e169
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:00007f7efbcd9038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f7efafb5fa0 RCX: 00007f7efad8e169
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 000000000000000a
RBP: 00007f7efae10a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7efafb5fa0 R15: 00007ffd7a8b5698
 </TASK>
task:syz.8.2997      state:R  running task     stack:22248 pid:17248 tgid:17245 ppid:10575  task_flags:0x400140 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 preempt_schedule_notrace+0x103/0x140 kernel/sched/core.c:7040
 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
 rcu_is_watching+0x7e/0xb0 kernel/rcu/tree.c:737
 trace_notifier_run include/trace/events/notifier.h:59 [inline]
 notifier_call_chain+0x151/0x3f0 kernel/notifier.c:84
 atomic_notifier_call_chain+0xdb/0x180 kernel/notifier.c:223
 addrconf_ifdown+0xf11/0x1b10 net/ipv6/addrconf.c:3979
 addrconf_notify+0x3cb/0x1020 net/ipv6/addrconf.c:-1
 notifier_call_chain+0x1a7/0x3f0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
 call_netdevice_notifiers net/core/dev.c:2228 [inline]
 dev_close_many+0x33e/0x4c0 net/core/dev.c:1731
 unregister_netdevice_many_notify+0x87f/0x2640 net/core/dev.c:11952
 rtnl_newlink_create+0x951/0xcb0 net/core/rtnetlink.c:3861
 __rtnl_newlink net/core/rtnetlink.c:3950 [inline]
 rtnl_newlink+0x18b0/0x1fe0 net/core/rtnetlink.c:4065
 rtnetlink_rcv_msg+0x811/0xd70 net/core/rtnetlink.c:6955
 netlink_rcv_skb+0x20a/0x480 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x7fa/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+0x223/0x270 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+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbe6618e169
RSP: 002b:00007fbe66f7f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbe663b5fa0 RCX: 00007fbe6618e169
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000005
RBP: 00007fbe66210a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fbe663b5fa0 R15: 00007fff6bd88ce8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g56001 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=62846
rcu: rcu_preempt kthread starved for 10502 jiffies! g56001 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:26688 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x15b/0x2b0 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+0x7b9/0x940 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [kworker/u8:2:36]
Modules linked in:
irq event stamp: 10164368
hardirqs last  enabled at (10164367): [<ffffffff8c2fc0e3>] irqentry_exit+0x63/0x90 kernel/entry/common.c:357
hardirqs last disabled at (10164368): [<ffffffff8c2f9c2e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049
softirqs last  enabled at (10164366): [<ffffffff8183e65b>] __do_softirq kernel/softirq.c:613 [inline]
softirqs last  enabled at (10164366): [<ffffffff8183e65b>] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last  enabled at (10164366): [<ffffffff8183e65b>] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680
softirqs last disabled at (10164333): [<ffffffff8183e65b>] __do_softirq kernel/softirq.c:613 [inline]
softirqs last disabled at (10164333): [<ffffffff8183e65b>] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last disabled at (10164333): [<ffffffff8183e65b>] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680
CPU: 0 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 34 07 b7 0c 48 89 de 5b e9 03 c7 5e 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 60 68 93 65 8b 15 f8 a2 a5 11 81 e2 00 01 ff 00
RSP: 0018:ffffc90000ad7638 EFLAGS: 00000202
RAX: ffffffff81b6e40d RBX: 1ffff110170e7e91 RCX: ffff888143ae1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000ad7840 R08: ffffffff81b6e3d8 R09: 1ffffffff20bfcae
R10: dffffc0000000000 R11: fffffbfff20bfcaf R12: ffff8880b863ad08
R13: ffff8880b873f488 R14: ffff8880b863ad00 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888124f9a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3446e8 CR3: 000000000eb38000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 csd_lock_wait kernel/smp.c:340 [inline]
 smp_call_function_many_cond+0x1bcd/0x2d40 kernel/smp.c:885
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:2455 [inline]
 text_poke_bp_batch+0x354/0xb30 arch/x86/kernel/alternative.c:2665
 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xc0/0x250 mm/kfence/core.c:850
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac5/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd50 kernel/workqueue.c:3400
 kthread+0x7b9/0x940 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 17251 Comm: syz.5.3000 Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__lock_acquire+0x823/0xd80 kernel/locking/lockdep.c:-1
Code: ff 1f 00 00 41 c1 ec 03 41 81 e4 00 60 00 00 41 09 c4 4c 89 f8 48 c1 e8 20 89 c1 c1 c1 04 41 29 c4 44 31 e1 44 01 f8 41 29 cf <89> ca c1 c2 06 44 31 fa 01 c1 89 d6 c1 c6 08 29 d0 31 c6 01 ca 29
RSP: 0018:ffffc90000a08a20 EFLAGS: 00000802
RAX: 00000000f8797233 RBX: 0000000000000003 RCX: 00000000666d06f3
RDX: 0000000000000008 RSI: ffff88802f668b68 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000b2b20f67
R13: ffff88802f668000 R14: ffff88802f668b88 R15: 0000000044be7aa7
FS:  00007f7efbcd96c0(0000) GS:ffff88812509a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3d878f CR3: 000000005c27a000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd8/0x130 kernel/locking/spinlock.c:162
 debug_object_activate+0x190/0x5c0 lib/debugobjects.c:818
 debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline]
 debug_activate kernel/time/hrtimer.c:484 [inline]
 enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1088
 __run_hrtimer kernel/time/hrtimer.c:1778 [inline]
 __hrtimer_run_queues+0x6d6/0xd40 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x420 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:console_flush_all+0x998/0xec0 arch/x86/include/asm/irqflags.h:-1
Code: 48 21 c3 0f 85 16 02 00 00 e8 24 e5 20 00 4c 8b 7c 24 10 4d 85 f6 75 07 e8 15 e5 20 00 eb 06 e8 0e e5 20 00 fb 48 8b 5c 24 18 <48> 8b 44 24 30 42 80 3c 28 00 74 08 48 89 df e8 d4 1e 8b 00 4c 8b
RSP: 0018:ffffc9001e1a6a20 EFLAGS: 00000287
RAX: ffffffff81a1d812 RBX: ffffffff8f5a1f98 RCX: 0000000000080000
RDX: ffffc9000d9c7000 RSI: 0000000000003e21 RDI: 0000000000003e22
RBP: ffffc9001e1a6bd0 R08: ffffffff81a1d7e9 R09: 1ffffffff20bfcae
R10: dffffc0000000000 R11: fffffbfff20bfcaf R12: ffffffff8f5a1f40
R13: dffffc0000000000 R14: 0000000000000200 R15: ffffc9001e1a6c20
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0x151/0x3b0 kernel/printk/printk.c:3325
 vprintk_emit+0x761/0xa40 kernel/printk/printk.c:2450
 _printk+0xd5/0x120 kernel/printk/printk.c:2475
 validate_nla lib/nlattr.c:414 [inline]
 __nla_validate_parse+0x1bf9/0x32e0 lib/nlattr.c:635
 __nla_parse+0x40/0x60 lib/nlattr.c:732
 __nlmsg_parse include/net/netlink.h:765 [inline]
 nlmsg_parse_deprecated include/net/netlink.h:806 [inline]
 rtnl_setlink+0x1b5/0xc00 net/core/rtnetlink.c:3437
 rtnetlink_rcv_msg+0x811/0xd70 net/core/rtnetlink.c:6955
 netlink_rcv_skb+0x20a/0x480 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x7fa/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+0x223/0x270 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+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7efad8e169
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:00007f7efbcd9038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f7efafb5fa0 RCX: 00007f7efad8e169
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 000000000000000a
RBP: 00007f7efae10a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7efafb5fa0 R15: 00007ffd7a8b5698
 </TASK>