rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=c794/1/0x4000000000000000 softirq=171057/171058 fqs=1
rcu: 	(detected by 0, t=10505 jiffies, g=189805, q=295 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 26145 Comm: syz.1.5279 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:88 [inline]
RIP: 0010:do_raw_spin_lock+0xfc/0x260 kernel/locking/spinlock_debug.c:115
Code: 48 89 ea 48 c1 ea 03 0f b6 14 02 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 37 01 00 00 8b 53 08 65 8b 05 f8 9d 4e 12 <39> c2 0f 84 06 01 00 00 48 89 df be 04 00 00 00 c7 44 24 28 00 00
RSP: 0018:ffffc90000a08d50 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff88807e5122a8 RCX: 02f990b21a47cf88
RDX: 00000000ffffffff RSI: ffffffff8e137691 RDI: ffff88807e5122ac
RBP: ffff88807e5122b0 R08: 00000000ffffffff R09: 0000000000000f2f
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff920001411ab
R13: ffff88807e5122b8 R14: ffff8880b8528640 R15: ffff8880b8528690
FS:  00007f74057916c0(0000) GS:ffff8881241e0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7404c08c98 CR3: 0000000021ec4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 spin_lock include/linux/spinlock.h:342 [inline]
 advance_sched+0xe5/0xd20 net/sched/sch_taprio.c:930
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 96 5e 45 f6 48 89 df e8 1e ae 45 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 25 bf 34 f6 65 8b 05 ee 48 94 08 85 c0 74 16 5b
RSP: 0018:ffffc90005ce7b28 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff9b43b3d8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e15d37c RDI: ffffffff8c3e9a80
RBP: 0000000000000286 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffffffffffff R12: ffffffff9b43b140
R13: 0000000000000000 R14: ffffc90005ce7c80 R15: ffffffff9b43b31c
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:571 [inline]
 __do_adjtimex+0x892/0xe70 kernel/time/timekeeping.c:2953
 do_adjtimex+0xa0/0x370 kernel/time/timekeeping.c:2996
 do_clock_adjtime kernel/time/posix-timers.c:1169 [inline]
 __do_sys_clock_adjtime+0x177/0x290 kernel/time/posix-timers.c:1181
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f740499ce59
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:00007f7405791028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f7404c16090 RCX: 00007f740499ce59
RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000000000000000
RBP: 00007f7404a32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7404c16128 R14: 00007f7404c16090 R15: 00007ffe0a21cf58
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g189805 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:27528 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7326
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 17290 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0x589/0x16c0 kernel/smp.c:892
Code: b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 b9 95 0c 00 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 2c 0f 00 00 8b 45 08 31
RSP: 0018:ffffc9000e17f618 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81fcea8d
RDX: ffff88806e7a0000 RSI: ffffffff81fcea67 RDI: ffff88806e7a0000
RBP: ffff8880b8541240 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed10170a8249 R14: 0000000000000001 R15: ffff8880b843c880
FS:  0000555585b30500(0000) GS:ffff8881240e0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6cdc7456b8 CR3: 0000000026444000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1057
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x45f/0x16f0 arch/x86/mm/tlb.c:1451
 dup_mmap+0x1307/0x21b0 mm/mmap.c:1905
 dup_mm kernel/fork.c:1538 [inline]
 copy_mm kernel/fork.c:1590 [inline]
 copy_process+0x4588/0x8030 kernel/fork.c:2288
 kernel_clone+0x176/0x9d0 kernel/fork.c:2747
 __do_sys_clone+0xd9/0x120 kernel/fork.c:2888
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6cdb9c58d2
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 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 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffc61024f20 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc61024f20 RCX: 00007f6cdb9c58d2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc610250ac R08: 0000000000000000 R09: 0000000000000001
R10: 0000555585b307d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 000000000018adfb R15: 00007ffc61025100
 </TASK>