rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=03dc/1/0x4000000000000000 softirq=49197/49197 fqs=20
rcu: 	(detected by 0, t=10502 jiffies, g=61021, q=394 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 10941 Comm: syz.4.1365 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:251 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0xb0 kernel/kcov.c:328
Code: 01 10 4a 89 74 01 18 4a 89 44 01 20 e9 dc 1a 47 ff 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 15 b8 49 18 13 65 48 8b 0d b8 49 18 13 f7 c1 00 01 00 ff
RSP: 0018:ffffc90000a18cf0 EFLAGS: 00000046
RAX: ffffffff8a097b68 RBX: ffffffff8a097b38 RCX: ffff8880319f5dc0
RDX: 00000000105209fd RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8a097b38 R09: 0000000000000001
R10: dffffc0000000000 R11: ffffed1005f56c56 R12: ffff888051b7ec00
R13: ffff88802fab6000 R14: dffffc0000000000 R15: ffff88802fab6340
FS:  00007f74fd1246c0(0000) GS:ffff888123509000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c35c44e CR3: 000000003e4f2000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 rcu_read_lock include/linux/rcupdate.h:850 [inline]
 advance_sched+0xa18/0xc80 net/sched/sch_taprio.c:1005
 __run_hrtimer kernel/time/hrtimer.c:2079 [inline]
 __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2136
 hrtimer_interrupt+0x4cd/0xaa0 kernel/time/hrtimer.c:2255
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 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+0x47/0x80 kernel/locking/spinlock.c:221
Code: f7 e8 bd 52 9c f5 f7 c3 00 02 00 00 74 05 e8 c0 f1 c8 f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 84 44 8d f5 65 48 8b 05 bc f0 d8 08 48 85 c0 74 18 5b 41 5e e9
RSP: 0018:ffffc90005f97aa8 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 8000000000000001
RDX: 0000000000000007 RSI: ffffffff8e6a8974 RDI: 0000000000000001
RBP: ffffc90005f97bd0 R08: ffffffff91be00bf R09: 1ffffffff237c017
R10: dffffc0000000000 R11: fffffbfff237c018 R12: 18e83b4794cc10c0
R13: dffffc0000000000 R14: ffff8880b8228600 R15: 1ffff110170450c9
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:596 [inline]
 clock_was_set+0x6b4/0x890 kernel/time/hrtimer.c:1001
 do_adjtimex+0x24f/0x370 kernel/time/timekeeping.c:3061
 do_clock_adjtime kernel/time/posix-timers.c:1182 [inline]
 __do_sys_clock_adjtime kernel/time/posix-timers.c:1194 [inline]
 __se_sys_clock_adjtime kernel/time/posix-timers.c:1185 [inline]
 __x64_sys_clock_adjtime+0x252/0x340 kernel/time/posix-timers.c:1185
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f74fc19fb19
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:00007f74fd124028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f74fc425fa0 RCX: 00007f74fc19fb19
RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000000
RBP: 00007f74fc237b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f74fc426038 R14: 00007f74fc425fa0 R15: 00007ffdb045cbb8
 </TASK>
rcu: rcu_preempt kthread starved for 10295 jiffies! g61021 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5584 [inline]
 __schedule+0x1828/0x58c0 kernel/sched/core.c:7389
 __schedule_loop kernel/sched/core.c:7466 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7481
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 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: 0 Comm: swapper/0 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 4a 92 02 e9 ae 8e 0a f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 da 23 00 fb f4 <e9> 87 8e 0a f5 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8fe07ca0 EFLAGS: 00000246
RAX: 0000000000b22439 RBX: ffffffff819ca8c0 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e6a8974 RDI: ffffffff8c8ea380
RBP: ffffffff8fe07d78 R08: ffff8880b8233d9b R09: 1ffff110170467b3
R10: dffffc0000000000 R11: ffffed10170467b4 R12: 0000000000000000
R13: 1ffffffff1fd1df8 R14: 1ffffffff1fc0f9c R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888123409000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab1f152000 CR3: 000000007e79d000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:767 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:768
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x2e0/0x540 kernel/sched/idle.c:355
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:458
 rest_init+0x378/0x3a0 init/main.c:789
 start_kernel+0x392/0x3e0 init/main.c:1247
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x157
 </TASK>