rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=e57/1/0x4000000000000000 softirq=9863/9863 fqs=0 
	(detected by 0, t=10502 jiffies, g=13661, q=18)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4875 Comm: syz.2.120 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:preempt_count_add+0x2e/0x190 kernel/sched/core.c:5504
Code: 53 49 bf 00 00 00 00 00 fc ff df 48 c7 c0 80 0f 0b 96 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 eb 00 00 00 83 3d b2 9e b9 14 00 <75> 07 65 8b 05 f1 fe b0 7e 65 01 3d ea fe b0 7e 48 c7 c0 80 0f 0b
RSP: 0018:ffffc90000dd0c60 EFLAGS: 00000046
RAX: 0000000000000004 RBX: ffff8880b912a240 RCX: ffffffff960b0f03
RDX: 0000000000010000 RSI: ffffffff8a59e7e0 RDI: 0000000000000001
RBP: ffffc90000dd0d10 R08: dffffc0000000000 R09: fffffbfff1ad26b6
R10: fffffbfff1ad26b6 R11: 1ffffffff1ad26b5 R12: ffff8880b912a350
R13: 1ffff1101722546a R14: 1ffff920001ba190 R15: dffffc0000000000
FS:  00007f5ee74c66c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f38ab612e9c CR3: 000000001ecbf000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:127 [inline]
 _raw_spin_lock_irq+0x84/0xe0 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x5ff/0xc40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:347 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:357 [inline]
RIP: 0010:unwind_next_frame+0x947/0x1d90 arch/x86/kernel/unwind_orc.c:539
Code: e8 03 42 80 3c 28 00 74 05 e8 e5 b2 87 00 48 8b 44 24 08 4c 8d 78 f8 4c 8b 6b 10 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 48 <0f> b6 04 01 84 c0 0f 85 b7 0f 00 00 83 3b 00 0f 95 c0 4d 39 fe 0f
RSP: 0018:ffffc90002cbf828 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc90002cbf948 RCX: 1ffff92000597f29
RDX: 1ffffffff1bc3536 RSI: ffffffff8de1a9b0 RDI: ffffc90002cbf958
RBP: ffffc90002cbf990 R08: 0000000000000007 R09: ffffc90002cbf998
R10: fffff52000597f35 R11: 1ffff92000597f33 R12: 1ffffffff1bc3536
R13: ffffc90002cc0000 R14: ffffc90002cb8000 R15: ffffc90002cbf9d8
 __unwind_start+0x5bb/0x740 arch/x86/kernel/unwind_orc.c:704
 unwind_start arch/x86/include/asm/unwind.h:60 [inline]
 arch_stack_walk+0xda/0x140 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1710 [inline]
 slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
 slab_free mm/slub.c:3504 [inline]
 kmem_cache_free+0x8f/0x210 mm/slub.c:3520
 do_sys_openat2+0x207/0x4a0 fs/open.c:1264
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5ee925f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5ee74c6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5ee94b5fa0 RCX: 00007f5ee925f749
RDX: 0000000000200002 RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f5ee92e3f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5ee94b6038 R14: 00007f5ee94b5fa0 R15: 00007ffeffd891c8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g13661 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=4099
rcu: rcu_preempt kthread starved for 10502 jiffies! g13661 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27200 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4875 Comm: syz.2.120 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__lock_acquire+0x1027/0x7c60 kernel/locking/lockdep.c:-1
Code: 06 44 31 f9 01 f0 89 ca c1 c2 08 29 ce 31 f2 01 c1 29 d0 41 89 d6 41 c1 c6 10 41 31 c6 01 ca 44 89 f3 c1 c3 13 44 29 f1 31 cb <41> 01 d6 29 da 41 89 dc 41 c1 c4 04 41 31 d4 48 c7 c0 48 69 69 8d
RSP: 0018:ffffc90000dd08c0 EFLAGS: 00000006
RAX: 00000000036b31bd RBX: 000000005577a2f3 RCX: 000000003c39bce5
RDX: 00000000fc914ab7 RSI: 0000000000036856 RDI: ffffffff8ffaa270
RBP: ffffc90000dd0b10 R08: dffffc0000000000 R09: fffffbfff1ff544f
R10: fffffbfff1ff544f R11: 1ffffffff1ff544e R12: 0000000000000d97
R13: ffff88802c70bb80 R14: 00000000c3c2cd29 R15: 0000000000000d97
FS:  00007f5ee74c66c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f38ab612e9c CR3: 000000001ecbf000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:364 [inline]
 advance_sched+0x47/0x940 net/sched/sch_taprio.c:716
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x53d/0xc40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:347 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:357 [inline]
RIP: 0010:unwind_next_frame+0x947/0x1d90 arch/x86/kernel/unwind_orc.c:539
Code: e8 03 42 80 3c 28 00 74 05 e8 e5 b2 87 00 48 8b 44 24 08 4c 8d 78 f8 4c 8b 6b 10 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 48 <0f> b6 04 01 84 c0 0f 85 b7 0f 00 00 83 3b 00 0f 95 c0 4d 39 fe 0f
RSP: 0018:ffffc90002cbf828 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc90002cbf948 RCX: 1ffff92000597f29
RDX: 1ffffffff1bc3536 RSI: ffffffff8de1a9b0 RDI: ffffc90002cbf958
RBP: ffffc90002cbf990 R08: 0000000000000007 R09: ffffc90002cbf998
R10: fffff52000597f35 R11: 1ffff92000597f33 R12: 1ffffffff1bc3536
R13: ffffc90002cc0000 R14: ffffc90002cb8000 R15: ffffc90002cbf9d8
 __unwind_start+0x5bb/0x740 arch/x86/kernel/unwind_orc.c:704
 unwind_start arch/x86/include/asm/unwind.h:60 [inline]
 arch_stack_walk+0xda/0x140 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1710 [inline]
 slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
 slab_free mm/slub.c:3504 [inline]
 kmem_cache_free+0x8f/0x210 mm/slub.c:3520
 do_sys_openat2+0x207/0x4a0 fs/open.c:1264
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5ee925f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5ee74c6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5ee94b5fa0 RCX: 00007f5ee925f749
RDX: 0000000000200002 RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f5ee92e3f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5ee94b6038 R14: 00007f5ee94b5fa0 R15: 00007ffeffd891c8
 </TASK>