rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=7124/1/0x4000000000000000 softirq=62051/62053 fqs=2
rcu: 	(detected by 1, t=10502 jiffies, g=50529, q=630 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5609 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:679 [inline]
RIP: 0010:debug_object_activate+0x151/0x490 lib/debugobjects.c:875
Code: e8 65 39 9b 48 8d b3 e0 65 39 9b 48 89 c7 48 89 74 24 10 48 89 44 24 08 e8 fc 9c 90 06 48 8b 74 24 10 48 8b 54 24 18 49 89 c2 <48> 89 f0 48 c1 e8 03 42 80 3c 20 00 0f 85 a3 02 00 00 48 8b 9b e0
RSP: 0018:ffffc90000007d70 EFLAGS: 00000092
RAX: 0000000000000002 RBX: 000000000008c580 RCX: ffffffff81e54168
RDX: ffffffff8bb2f940 RSI: ffffffff9b422b60 RDI: ffffc90000007ce0
RBP: ffffc90000007e58 R08: 0000000000000001 R09: fffff52000000f9c
R10: 0000000000000002 R11: ffffc90000007ff8 R12: dffffc0000000000
R13: ffff8880752ee300 R14: 0000000000000000 R15: 1ffff92000000fb2
FS:  000055557607e500(0000) GS:ffff88812431a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3787db CR3: 000000005c041000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 debug_hrtimer_activate kernel/time/hrtimer.c:485 [inline]
 debug_activate kernel/time/hrtimer.c:528 [inline]
 enqueue_hrtimer+0x75/0x2f0 kernel/time/hrtimer.c:1109
 __run_hrtimer kernel/time/hrtimer.c:2048 [inline]
 __hrtimer_run_queues+0x6ed/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:finish_task_switch.isra.0+0x2cd/0x1010 kernel/sched/core.c:5361
Code: 2f 0a 00 00 41 c7 87 20 0e 00 00 00 00 00 00 e9 0f 04 00 00 49 8d 7f 48 e8 30 95 c4 09 e8 5b aa 3c 00 fb 48 8d bb f8 16 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84
RSP: 0018:ffffc90003947a70 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff88807db10000 RCX: ffffffff8211aa2f
RDX: 0000000000000000 RSI: ffffffff8c1d2680 RDI: ffff88807db116f8
RBP: ffffc90003947ac8 R08: 0000000000000000 R09: fffffbfff21b43d2
R10: 0000000000000000 R11: ffffffff81d4ff9c R12: ffff8880350fa540
R13: 0000000000000001 R14: ffffffff90da5264 R15: ffff8880b843b340
 context_switch kernel/sched/core.c:5507 [inline]
 __schedule+0x1264/0x6730 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7322
 do_nanosleep+0x113/0x500 kernel/time/hrtimer.c:2399
 hrtimer_nanosleep+0x14f/0x350 kernel/time/hrtimer.c:2445
 common_nsleep+0xa1/0xd0 kernel/time/posix-timers.c:1360
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1406 [inline]
 __se_sys_clock_nanosleep kernel/time/posix-timers.c:1383 [inline]
 __x64_sys_clock_nanosleep+0x336/0x480 kernel/time/posix-timers.c:1383
 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: 0033:0x7fd50ed5d68e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffe9ad8c178 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 000055557607e500 RCX: 00007fd50ed5d68e
RDX: 00007ffe9ad8c1d0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe9ad8c23c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000001388
R13: 00000000000927c0 R14: 000000000005045c R15: 00007ffe9ad8c290
 </TASK>
rcu: rcu_preempt kthread starved for 10498 jiffies! g50529 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:28416 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7322
 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: 1 UID: 0 PID: 12462 Comm: syz.3.1635 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x20 kernel/kcov.c:313
Code: 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 58 fe ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 2a fe ff ff
RSP: 0018:ffffc9000acc78a0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81fcc98d
RDX: ffff888048948000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8880b8443500 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000003
R13: ffffed10170886a1 R14: 0000000000000001 R15: ffff8880b853c700
FS:  0000000000000000(0000) GS:ffff88812441a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9bfa764286 CR3: 000000004b094000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 csd_lock_wait kernel/smp.c:342 [inline]
 smp_call_function_many_cond+0x5ad/0x16c0 kernel/smp.c:892
 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
 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:1313
 __mmput+0x12a/0x410 kernel/fork.c:1182
 mmput+0x67/0x80 kernel/fork.c:1205
 exit_mm kernel/exit.c:610 [inline]
 do_exit+0x8b1/0x2ae0 kernel/exit.c:992
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1147
 __do_sys_exit_group kernel/exit.c:1158 [inline]
 __se_sys_exit_group kernel/exit.c:1156 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1156
 x64_sys_call+0x102c/0x1530 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7fd50ed9ce59
Code: Unable to access opcode bytes at 0x7fd50ed9ce2f.
RSP: 002b:00007ffe9ad8c1d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd50ed9ce59
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe9ad8c23c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000012b
R13: 00000000000927c0 R14: 0000000000050342 R15: 00007ffe9ad8c290
 </TASK>