rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=3ee4/1/0x4000000000000000 softirq=25512/25512 fqs=20
rcu: 	(detected by 1, t=10502 jiffies, g=19217, q=1790 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6455 Comm: syz.4.20 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:__remove_hrtimer+0x13/0x650 kernel/time/hrtimer.c:1168
Code: 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 89 d7 41 56 41 55 41 54 41 89 cc 55 48 89 f5 53 <48> 89 fb 48 83 ec 10 88 4c 24 07 e8 dd b3 14 00 48 89 ea 48 b8 00
RSP: 0018:ffffc90000007e58 EFLAGS: 00000046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8880b8228640 RDI: ffff88803766e300
RBP: ffff8880b8228640 R08: 0000000000000000 R09: fffffbfff39829f6
R10: ffffffff9cc14fb3 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffff8880b8228640 R15: 0000000000000000
FS:  00007fc7028c26c0(0000) GS:ffff888122946000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3d5daa4000 CR3: 00000000592e6000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:2054 [inline]
 __hrtimer_run_queues+0x352/0x9c0 kernel/time/hrtimer.c:2131
 hrtimer_interrupt+0x441/0xaa0 kernel/time/hrtimer.c:2250
 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:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:221
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 b6 1a 10 f6 48 89 df e8 3e 71 10 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 55 54 ff f5 65 48 83 3d b4 43 b6 09 00 74 16 5b
RSP: 0018:ffffc90003687b50 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff8880b8228500 RCX: 0000000000000080
RDX: 0000000000000001 RSI: ffffffff8e3e3486 RDI: ffffffff8c625580
RBP: 0000000000000287 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000002 R15: ffff8880b8228500
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:594 [inline]
 clock_was_set+0x631/0x910 kernel/time/hrtimer.c:997
 do_adjtimex+0x302/0x370 kernel/time/timekeeping.c:3057
 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:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc701997479
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:00007fc7028c2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007fc701bc5fa0 RCX: 00007fc701997479
RDX: 0000000000000000 RSI: 0000400000000040 RDI: 0000000000000000
RBP: 00007fc701a281bc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc701bc5fa0 R15: 00007ffe75d19d68
 </TASK>
rcu: rcu_preempt kthread starved for 10462 jiffies! g19217 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:R  running task     stack:28984 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x1259/0x6920 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7376
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x8f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x17a/0x220 kernel/rcu/tree.c:2330
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 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: 1 UID: 0 PID: 6454 Comm: sed Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:write_comp_data+0x90/0xa0 kernel/kcov.c:268
Code: 00 00 4a 8d 14 dd 28 00 00 00 48 39 d7 72 1b 48 83 c6 01 48 89 30 4c 89 44 10 e0 4c 89 4c 10 e8 4c 89 54 10 f0 4a 89 4c d8 20 <e9> db 67 cb 09 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90
RSP: 0018:ffffc9000381f830 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b8243e20 RCX: ffffffff81ff7eab
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88805a614b00
RBP: ffff8880b8243e28 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000003
R13: ffffed10170487c5 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888122a46000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe6937ac368 CR3: 00000000592d2000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 csd_lock_wait kernel/smp.c:363 [inline]
 csd_lock kernel/smp.c:396 [inline]
 smp_call_function_many_cond+0x59b/0x18c0 kernel/smp.c:944
 __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+0x3c9/0x1370 arch/x86/mm/tlb.c:1435
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:509 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:499 [inline]
 tlb_flush_mmu mm/mmu_gather.c:423 [inline]
 tlb_finish_mmu+0x3fe/0x810 mm/mmu_gather.c:549
 exit_mmap+0x454/0xa00 mm/mmap.c:1328
 __mmput+0x12a/0x410 kernel/fork.c:1193
 mmput+0x67/0x80 kernel/fork.c:1216
 exit_mm kernel/exit.c:592 [inline]
 do_exit+0x83b/0x2a50 kernel/exit.c:974
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1129
 __do_sys_exit_group kernel/exit.c:1140 [inline]
 __se_sys_exit_group kernel/exit.c:1138 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1138
 x64_sys_call+0x1567/0x1570 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3d5d8d26c5
Code: Unable to access opcode bytes at 0x7f3d5d8d269b.
RSP: 002b:00007ffd422b72e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f3d5d9d3fe8 RCX: 00007f3d5d8d26c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3d5d9d2680 R15: 00007f3d5d9d4000
 </TASK>