rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=4a1/1/0x4000000000000000 softirq=22311/22311 fqs=0 
	(detected by 0, t=10502 jiffies, g=27701, q=50)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8374 Comm: syz.4.1602 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:lock_is_held_type+0x0/0x190 kernel/locking/lockdep.c:5651
Code: 60 c0 03 00 75 d6 48 c7 c7 00 1b 0b 8a 48 c7 c6 40 1b 0b 8a e8 c1 37 f5 ff 0f 0b eb bf e8 98 fd ff ff 0f 1f 84 00 00 00 00 00 <55> 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00
RSP: 0018:ffffc90000dd0c78 EFLAGS: 00000002
RAX: ffffffff880972ff RBX: 0000000000000001 RCX: ffff88801d9e3b80
RDX: 0000000000010000 RSI: 00000000ffffffff RDI: ffff88807c941b00
RBP: ffff88807c941b40 R08: 0000000000000004 R09: 0000000000000003
R10: fffff520001ba180 R11: 1ffff920001ba180 R12: ffff88807c941800
R13: dffffc0000000000 R14: ffff88802326f500 R15: ffff888148408300
FS:  00007f4d754556c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000030030 CR3: 000000005afa0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_is_held include/linux/lockdep.h:287 [inline]
 advance_sched+0x141/0x940 net/sched/sch_taprio.c:721
 __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:unwind_next_frame+0x66f/0x1d90 arch/x86/kernel/unwind_orc.c:475
Code: 04 28 84 c0 0f 85 7f 13 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 8f 13 00 00 48 0f bf 02 48 01 c5 e9 0e 01 00 00 <4c> 8d 7b 40 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 0c 4c 89 ff e8
RSP: 0018:ffffc900031feca8 EFLAGS: 00000293
RAX: 0000000000000014 RBX: ffffc900031fed68 RCX: ffffffff8d7ef70c
RDX: ffffffff8dee2956 RSI: ffffffff8dee2956 RDI: ffffffff8134794c
RBP: ffffffff81bc0f2a R08: 000000000000000c R09: 0000000000000000
R10: fffff5200063fdb9 R11: 1ffff9200063fdb7 R12: 1ffffffff1bdc52b
R13: dffffc0000000000 R14: ffffffff8dee295a R15: 0000000000000004
 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
 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]
 kfree+0xef/0x2a0 mm/slub.c:4564
 free_func_state kernel/bpf/verifier.c:914 [inline]
 free_verifier_state+0xd8/0x220 kernel/bpf/verifier.c:930
 pop_stack+0x3ca/0x550 kernel/bpf/verifier.c:1032
 do_check+0x8c02/0xeac0 kernel/bpf/verifier.c:11482
 do_check_common+0xe67/0x16c0 kernel/bpf/verifier.c:13506
 do_check_main kernel/bpf/verifier.c:13569 [inline]
 bpf_check+0x31f3/0xf090 kernel/bpf/verifier.c:14140
 bpf_prog_load+0x1043/0x1550 kernel/bpf/syscall.c:2354
 __sys_bpf+0x4c2/0x670 kernel/bpf/syscall.c:4657
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 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: 0033:0x7f4d77230749
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:00007f4d75455038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f4d77487180 RCX: 00007f4d77230749
RDX: 0000000000000048 RSI: 00002000000054c0 RDI: 0000000000000005
RBP: 00007f4d772b4f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4d77487218 R14: 00007f4d77487180 R15: 00007ffd2f67bc48
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g27701 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=17425
rcu: rcu_preempt kthread starved for 10502 jiffies! g27701 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:27496 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: 8374 Comm: syz.4.1602 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:check_preemption_disabled+0x0/0x110 lib/smp_processor_id.c:13
Code: 00 00 48 c7 c7 20 dd 12 8a e8 2c 01 00 00 65 ff 0d 91 d6 59 76 5b c3 00 00 cc 48 c7 c7 20 e5 59 8a 48 c7 c6 60 e5 59 8a eb 00 <55> 41 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44
RSP: 0018:ffffc90000dd0b58 EFLAGS: 00000046
RAX: 1ffff11003b3c8cc RBX: ffffffffffffffff RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8a0b2f00 RDI: ffffffff8a59e580
RBP: ffffc90000dd0c70 R08: dffffc0000000000 R09: fffffbfff1ad33a6
R10: fffffbfff1ad33a6 R11: 1ffffffff1ad33a5 R12: ffff88801d9e4670
R13: dffffc0000000000 R14: ffff88801d9e4660 R15: 1ffff920001ba178
FS:  00007f4d754556c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000030030 CR3: 000000005afa0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lockdep_recursion_finish kernel/locking/lockdep.c:436 [inline]
 lock_release+0x540/0x870 kernel/locking/lockdep.c:5645
 rcu_read_unlock include/linux/rcupdate.h:773 [inline]
 advance_sched+0x7d0/0x940 net/sched/sch_taprio.c:771
 __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:unwind_next_frame+0x66f/0x1d90 arch/x86/kernel/unwind_orc.c:475
Code: 04 28 84 c0 0f 85 7f 13 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 8f 13 00 00 48 0f bf 02 48 01 c5 e9 0e 01 00 00 <4c> 8d 7b 40 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 0c 4c 89 ff e8
RSP: 0018:ffffc900031feca8 EFLAGS: 00000293
RAX: 0000000000000014 RBX: ffffc900031fed68 RCX: ffffffff8d7ef70c
RDX: ffffffff8dee2956 RSI: ffffffff8dee2956 RDI: ffffffff8134794c
RBP: ffffffff81bc0f2a R08: 000000000000000c R09: 0000000000000000
R10: fffff5200063fdb9 R11: 1ffff9200063fdb7 R12: 1ffffffff1bdc52b
R13: dffffc0000000000 R14: ffffffff8dee295a R15: 0000000000000004
 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
 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]
 kfree+0xef/0x2a0 mm/slub.c:4564
 free_func_state kernel/bpf/verifier.c:914 [inline]
 free_verifier_state+0xd8/0x220 kernel/bpf/verifier.c:930
 pop_stack+0x3ca/0x550 kernel/bpf/verifier.c:1032
 do_check+0x8c02/0xeac0 kernel/bpf/verifier.c:11482
 do_check_common+0xe67/0x16c0 kernel/bpf/verifier.c:13506
 do_check_main kernel/bpf/verifier.c:13569 [inline]
 bpf_check+0x31f3/0xf090 kernel/bpf/verifier.c:14140
 bpf_prog_load+0x1043/0x1550 kernel/bpf/syscall.c:2354
 __sys_bpf+0x4c2/0x670 kernel/bpf/syscall.c:4657
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 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: 0033:0x7f4d77230749
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:00007f4d75455038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f4d77487180 RCX: 00007f4d77230749
RDX: 0000000000000048 RSI: 00002000000054c0 RDI: 0000000000000005
RBP: 00007f4d772b4f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4d77487218 R14: 00007f4d77487180 R15: 00007ffd2f67bc48
 </TASK>