rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=0eec/1/0x4000000000000000 softirq=26207/26207 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=23725, q=370 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8078 Comm: syz.2.484 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d 64 2d da 0b 48 89 de 5b e9 73 fe 5a 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 40 80 92 65 8b 15 68 47
RSP: 0018:ffffc90000a08d00 EFLAGS: 00000097
RAX: ffffffff81ae9b9f RBX: ffff888028006300 RCX: 0000000000010000
RDX: ffff88804cb35b80 RSI: 0000000000000001 RDI: 0000000000000007
RBP: 0000000000000000 R08: ffffffff99aef753 R09: 1ffffffff335deea
R10: dffffc0000000000 R11: fffffbfff335deeb R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff8880b87283c0 R15: 0000000000000001
FS:  00007f27d144f6c0(0000) GS:ffff888125f1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f336e240e77 CR3: 000000007bdd4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 cpu_max_bits_warn include/linux/cpumask.h:138 [inline]
 cpumask_check include/linux/cpumask.h:145 [inline]
 cpumask_test_cpu include/linux/cpumask.h:649 [inline]
 cpu_online include/linux/cpumask.h:1231 [inline]
 trace_hrtimer_start include/trace/events/timer.h:222 [inline]
 debug_activate kernel/time/hrtimer.c:478 [inline]
 enqueue_hrtimer+0x5e/0x380 kernel/time/hrtimer.c:1081
 __run_hrtimer kernel/time/hrtimer.c:1794 [inline]
 __hrtimer_run_queues+0x636/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_flush_one_record arch/x86/include/asm/irqflags.h:-1 [inline]
RIP: 0010:console_flush_all+0x7fc/0xb00 kernel/printk/printk.c:3289
Code: ff ff e8 b7 f9 1f 00 90 0f 0b 90 e9 85 fc ff ff e8 a9 f9 1f 00 e8 14 42 b9 09 48 85 db 74 c0 e8 9a f9 1f 00 fb 48 8b 5c 24 10 <48> 8b 44 24 20 42 80 3c 28 00 4c 8b 74 24 18 74 08 4c 89 f7 e8 6b
RSP: 0018:ffffc9000cdfeae0 EFLAGS: 00000283
RAX: ffffffff81a0ff16 RBX: ffffc9000cdfec40 RCX: 0000000000080000
RDX: ffffc9000d4d9000 RSI: 0000000000008cb8 RDI: 0000000000008cb9
RBP: ffffc9000cdfebf0 R08: ffffffff8f823877 R09: 1ffffffff1f0470e
R10: dffffc0000000000 R11: fffffbfff1f0470f R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff8e792280
 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline]
 console_unlock+0xbb/0x190 kernel/printk/printk.c:3359
 vprintk_emit+0x47b/0x550 kernel/printk/printk.c:2426
 dev_vprintk_emit+0x337/0x3f0 drivers/base/core.c:4914
 dev_printk_emit+0xe0/0x130 drivers/base/core.c:4925
 _dev_warn+0x10a/0x160 drivers/base/core.c:4981
 firmware_fallback_sysfs+0x4a1/0xa40 drivers/base/firmware_loader/fallback.c:233
 _request_firmware+0xfa4/0x1680 drivers/base/firmware_loader/main.c:898
 request_firmware+0x36/0x50 drivers/base/firmware_loader/main.c:948
 reg_reload_regdb+0x8f/0x480 net/wireless/reg.c:1080
 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x505/0x820 net/socket.c:2592
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2681
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f27d058f749
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:00007f27d144f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f27d07e5fa0 RCX: 00007f27d058f749
RDX: 0000000020008004 RSI: 00002000000006c0 RDI: 000000000000000a
RBP: 00007f27d0613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f27d07e6038 R14: 00007f27d07e5fa0 R15: 00007ffdabb9b818
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g23725 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=11370
rcu: rcu_preempt kthread starved for 10502 jiffies! g23725 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:27816 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 238s! [syz-executor:5836]
Modules linked in:
irq event stamp: 1500842
hardirqs last  enabled at (1500841): [<ffffffff8b5a4e28>] irqentry_exit+0x5e8/0x670 kernel/entry/common.c:219
hardirqs last disabled at (1500842): [<ffffffff8b5a37ae>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056
softirqs last  enabled at (1500840): [<ffffffff81853b70>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (1500840): [<ffffffff81853b70>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (1500840): [<ffffffff81853b70>] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723
softirqs last disabled at (1500801): [<ffffffff81853b70>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (1500801): [<ffffffff81853b70>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (1500801): [<ffffffff81853b70>] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723
CPU: 0 UID: 0 PID: 5836 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xcc5/0x1260 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 d4 97 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 7f 93 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 63 93
RSP: 0018:ffffc9000405f640 EFLAGS: 00000293
RAX: ffffffff81b5654d RBX: 1ffff110170e8129 RCX: ffff888028f61e80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000405f768 R08: ffffffff8f823877 R09: 1ffffffff1f0470e
R10: dffffc0000000000 R11: fffffbfff1f0470f R12: ffff8880b8740948
R13: dffffc0000000000 R14: ffff8880b863bb00 R15: 0000000000000001
FS:  0000555590bcf500(0000) GS:ffff888125e1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdaca7156c0 CR3: 0000000033274000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline]
 flush_tlb_mm_range+0x60a/0x1170 arch/x86/mm/tlb.c:1472
 dup_mmap+0x15fa/0x1b80 mm/mmap.c:1866
 dup_mm kernel/fork.c:1529 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1581
 copy_process+0x165d/0x3950 kernel/fork.c:2221
 kernel_clone+0x21e/0x820 kernel/fork.c:2651
 __do_sys_clone kernel/fork.c:2792 [inline]
 __se_sys_clone kernel/fork.c:2776 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2776
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa63a985e93
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007fff35e5c858 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa63a985e93
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000555590bcf7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000004f R14: 0000000000035996 R15: 00007fff35e5c9f0
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8078 Comm: syz.2.484 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lock_release+0x80/0x3b0 kernel/locking/lockdep.c:5881
Code: 48 e4 0d 00 0f 84 1d 02 00 00 65 8b 05 b9 65 e2 10 85 c0 0f 85 0e 02 00 00 65 4c 8b 3c 25 08 40 80 92 41 83 bf 2c 0b 00 00 00 <0f> 85 f7 01 00 00 49 81 3e c0 f3 43 93 0f 84 ea 01 00 00 9c 5b fa
RSP: 0018:ffffc90000a08bf8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880280062a8 RCX: 0000000000010003
RDX: 0000000000010000 RSI: ffffffff8bc086c0 RDI: ffffffff8bc08680
RBP: ffff888056f23550 R08: ffff888056f23487 R09: 1ffff1100ade4690
R10: dffffc0000000000 R11: ffffed100ade4691 R12: ffff888028006300
R13: ffffffff8970e7df R14: ffff8880280062c0 R15: ffff88804cb35b80
FS:  00007f27d144f6c0(0000) GS:ffff888125f1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f336e240e77 CR3: 000000007bdd4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
 _raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 advance_sched+0x99f/0xc90 net/sched/sch_taprio.c:987
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_flush_one_record arch/x86/include/asm/irqflags.h:-1 [inline]
RIP: 0010:console_flush_all+0x7fc/0xb00 kernel/printk/printk.c:3289
Code: ff ff e8 b7 f9 1f 00 90 0f 0b 90 e9 85 fc ff ff e8 a9 f9 1f 00 e8 14 42 b9 09 48 85 db 74 c0 e8 9a f9 1f 00 fb 48 8b 5c 24 10 <48> 8b 44 24 20 42 80 3c 28 00 4c 8b 74 24 18 74 08 4c 89 f7 e8 6b
RSP: 0018:ffffc9000cdfeae0 EFLAGS: 00000283
RAX: ffffffff81a0ff16 RBX: ffffc9000cdfec40 RCX: 0000000000080000
RDX: ffffc9000d4d9000 RSI: 0000000000008cb8 RDI: 0000000000008cb9
RBP: ffffc9000cdfebf0 R08: ffffffff8f823877 R09: 1ffffffff1f0470e
R10: dffffc0000000000 R11: fffffbfff1f0470f R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff8e792280
 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline]
 console_unlock+0xbb/0x190 kernel/printk/printk.c:3359
 vprintk_emit+0x47b/0x550 kernel/printk/printk.c:2426
 dev_vprintk_emit+0x337/0x3f0 drivers/base/core.c:4914
 dev_printk_emit+0xe0/0x130 drivers/base/core.c:4925
 _dev_warn+0x10a/0x160 drivers/base/core.c:4981
 firmware_fallback_sysfs+0x4a1/0xa40 drivers/base/firmware_loader/fallback.c:233
 _request_firmware+0xfa4/0x1680 drivers/base/firmware_loader/main.c:898
 request_firmware+0x36/0x50 drivers/base/firmware_loader/main.c:948
 reg_reload_regdb+0x8f/0x480 net/wireless/reg.c:1080
 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x505/0x820 net/socket.c:2592
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2681
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f27d058f749
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:00007f27d144f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f27d07e5fa0 RCX: 00007f27d058f749
RDX: 0000000020008004 RSI: 00002000000006c0 RDI: 000000000000000a
RBP: 00007f27d0613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f27d07e6038 R14: 00007f27d07e5fa0 R15: 00007ffdabb9b818
 </TASK>