rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P21428/1:b..l
rcu: 	(detected by 1, t=10504 jiffies, g=125409, q=585 ncpus=2)
task:syz.6.5747      state:R  running task     stack:26920 pid:21428 tgid:21422 ppid:6409   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0x9a0/0x2550 arch/x86/kernel/unwind_orc.c:532
Code: 03 42 80 3c 20 00 74 08 48 89 df e8 ea 0c bd 00 48 8b 3b 48 85 ff 0f 84 db 0d 00 00 48 83 c7 50 e9 2d 01 00 00 48 8b 44 24 38 <42> 80 3c 20 00 74 0c 48 89 ef e8 c1 0c bd 00 49 8d 55 04 4c 8b 45
RSP: 0018:ffffc9001a53f648 EFLAGS: 00000246
RAX: 1ffff920034a7ef0 RBX: 0000000000000003 RCX: ffffffff9070d40c
RDX: ffffffff90eeb0da RSI: ffffffff90eeb07c RDI: ffffffff8c4bdc20
RBP: ffffc9001a53f780 R08: 0000000000000010 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59c60 R12: dffffc0000000000
R13: ffffffff90eeb0d6 R14: ffffc9001a53f748 R15: 1ffff920034a7ee9
 __unwind_start+0x514/0x660 arch/x86/kernel/unwind_orc.c:787
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4584 [inline]
 slab_alloc_node mm/slub.c:4917 [inline]
 kmem_cache_alloc_noprof+0x2a0/0x5f0 mm/slub.c:4931
 locks_alloc_lock fs/locks.c:285 [inline]
 fcntl_setlk+0xa9/0x1070 fs/locks.c:2568
 do_fcntl+0x956/0x1a30 fs/fcntl.c:500
 __do_sys_fcntl fs/fcntl.c:602 [inline]
 __se_sys_fcntl+0xc8/0x150 fs/fcntl.c:587
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f431479de99
RSP: 002b:00007f43156aa028 EFLAGS: 00000246 ORIG_RAX: 0000000000000048
RAX: ffffffffffffffda RBX: 00007f4314a26090 RCX: 00007f431479de99
RDX: 00002000000000c0 RSI: 0000000000000026 RDI: 0000000000000004
RBP: 00007f4314833eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4314a26128 R14: 00007f4314a26090 R15: 00007ffe38fc35c8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g125409 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=59122
rcu: rcu_preempt kthread starved for 10502 jiffies! g125409 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27496 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7326
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
 kthread+0x388/0x470 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 21437 Comm: syz.5.5752 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:advance_sched+0x217/0xc80 net/sched/sch_taprio.c:935
Code: 5f e6 e8 f7 eb 05 e8 58 e6 e8 f7 48 8b 5c 24 30 48 8b 44 24 28 48 83 c0 f8 48 89 c1 48 c1 e9 03 48 89 4c 24 58 42 80 3c 31 00 <48> 89 44 24 18 74 0f 48 8b 7c 24 18 e8 88 7a 56 f8 48 8b 44 24 18
RSP: 0018:ffffc90000007d10 EFLAGS: 00000046
RAX: ffff88801d7c42f8 RBX: ffff88801d7c42f0 RCX: 1ffff11003af885f
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88801d7c4300 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f90 R12: 0000000000000000
R13: ffff88801d7c4000 R14: dffffc0000000000 R15: ffff888031022800
FS:  00007fcdc26d66c0(0000) GS:ffff888124f4e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f13c9c104b2 CR3: 000000007c686000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2215
 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:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 ad bc cf f5 f7 c3 00 02 00 00 74 05 e8 20 a1 fb f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> b4 d2 c0 f5 65 8b 05 ad 82 99 07 85 c0 74 18 5b 41 5e e9 7c a3
RSP: 0018:ffffc9001e3efa58 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000202 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8e22d06b RDI: 0000000000000001
RBP: ffff8880519c1ce8 R08: ffffffff90579137 R09: 1ffffffff20af226
R10: dffffc0000000000 R11: fffffbfff20af227 R12: ffff8880519c1c90
R13: dffffc0000000000 R14: ffff8880519c1c98 R15: ffff8880519c1d08
 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
 timerfd_clock_was_set+0x1cb/0x2c0 fs/timerfd.c:115
 clock_was_set+0x742/0x7e0 kernel/time/hrtimer.c:1004
 do_adjtimex+0x25d/0x370 kernel/time/timekeeping.c:3006
 do_clock_adjtime kernel/time/posix-timers.c:1169 [inline]
 __do_sys_clock_adjtime kernel/time/posix-timers.c:1181 [inline]
 __se_sys_clock_adjtime kernel/time/posix-timers.c:1172 [inline]
 __x64_sys_clock_adjtime+0x252/0x340 kernel/time/posix-timers.c:1172
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcdc179de99
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:00007fcdc26d6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007fcdc1a26090 RCX: 00007fcdc179de99
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000000
RBP: 00007fcdc1833eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcdc1a26128 R14: 00007fcdc1a26090 R15: 00007ffe95e97548
 </TASK>