rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (0 ticks this GP) idle=c1b/1/0x4000000000000002 softirq=24422/24422 fqs=5232 
	(detected by 1, t=10502 jiffies, g=34573, q=1039)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9672 Comm: syz.3.1503 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:227 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x32/0x80 kernel/kcov.c:300
Code: 44 a1 8a 7e 65 8b 15 45 a1 8a 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 34 16 00 00 00 74 4e 8b 91 10 16 00 00 <83> fa 03 75 43 48 8b 91 18 16 00 00 44 8b 89 14 16 00 00 49 c1 e1
RSP: 0018:ffffc90002d2e988 EFLAGS: 00000046
RAX: ffffffff81960df3 RBX: 0000000000080410 RCX: ffff88802ace5940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffc90002d2eb20
R10: fffff520005a5d6b R11: 1ffff920005a5d64 R12: ffff88805db6c302
R13: dffffc0000000000 R14: ffff88805db6c1a8 R15: ffffc90002d2eb86
FS:  00007f500d8546c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000005bb26000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 __perf_event_header__init_id+0xb3/0x500 kernel/events/core.c:7103
 perf_prepare_sample+0x158/0x1cb0 kernel/events/core.c:7624
 __perf_event_output kernel/events/core.c:7802 [inline]
 perf_event_output_forward+0x146/0x280 kernel/events/core.c:7822
 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
 perf_swevent_overflow kernel/events/core.c:9591 [inline]
 perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629
 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
 perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 6d 13 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90002d2f1a0 EFLAGS: 00000206
RAX: 635954c2c855fc00 RBX: 1ffff920005a5e38 RCX: 635954c2c855fc00
RDX: dffffc0000000000 RSI: ffffffff8a0b18a0 RDI: ffffffff8a59a880
RBP: ffffc90002d2f270 R08: dffffc0000000000 R09: fffffbfff1ff7a2c
R10: fffffbfff1ff7a2c R11: 1ffffffff1ff7a2b R12: ffffffff8c120c00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 percpu_ref_put_many include/linux/percpu-refcount.h:324 [inline]
 percpu_ref_put+0xcc/0x150 include/linux/percpu-refcount.h:338
 css_put include/linux/cgroup.h:405 [inline]
 obj_cgroup_uncharge_pages mm/memcontrol.c:2998 [inline]
 __memcg_kmem_uncharge_page+0xb7/0x140 mm/memcontrol.c:3083
 memcg_kmem_uncharge_page include/linux/memcontrol.h:1703 [inline]
 free_thread_stack+0x11e/0x430 kernel/fork.c:283
 release_task_stack kernel/fork.c:433 [inline]
 put_task_stack+0x97/0x140 kernel/fork.c:444
 finish_task_switch+0x26f/0x640 kernel/sched/core.c:4961
 context_switch kernel/sched/core.c:5052 [inline]
 __schedule+0x11c3/0x4390 kernel/sched/core.c:6395
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:preempt_count mm/memcontrol.c:2915 [inline]
RIP: 0010:active_memcg mm/memcontrol.c:941 [inline]
RIP: 0010:memcg_kmem_bypass mm/memcontrol.c:1000 [inline]
RIP: 0010:get_obj_cgroup_from_current+0x0/0x2f0 mm/memcontrol.c:2919
Code: 07 80 c1 03 38 c1 0f 8c 55 ff ff ff 4c 89 e7 e8 36 88 fb ff e9 48 ff ff ff 48 89 df 48 c7 c6 20 df 15 8a e8 12 8b e9 ff 0f 0b <41> 57 41 56 53 65 8b 05 8c c5 41 7e a9 00 01 ff 00 74 12 65 48 8b
RSP: 0018:ffffc90002d2f720 EFLAGS: 00000202
RAX: ffff8880169e9640 RBX: ffffc90002d2f758 RCX: 0000000000000000
RDX: ffff88802ace5940 RSI: 0000000000000138 RDI: ffffffff8c1f10e0
RBP: 0000000000000cc0 R08: dffffc0000000000 R09: fffffbfff1ad334e
R10: fffffbfff1ad334e R11: 1ffffffff1ad334d R12: ffffc90002d2fb50
R13: ffff8880615bc000 R14: ffff8880169e9640 R15: 0000000000000001
 memcg_slab_pre_alloc_hook mm/slab.h:283 [inline]
 slab_pre_alloc_hook+0x7e/0xc0 mm/slab.h:497
 slab_alloc_node mm/slub.c:3139 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x3d/0x290 mm/slub.c:3238
 __d_alloc+0x2a/0x6f0 fs/dcache.c:1749
 d_alloc fs/dcache.c:1828 [inline]
 d_alloc_parallel+0x7e/0x12d0 fs/dcache.c:2582
 __lookup_slow+0x113/0x3d0 fs/namei.c:1656
 lookup_slow+0x53/0x70 fs/namei.c:1688
 walk_component+0x319/0x460 fs/namei.c:1984
 lookup_last fs/namei.c:2439 [inline]
 path_lookupat+0x169/0x440 fs/namei.c:2463
 filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
 user_path_at_empty+0x40/0x190 fs/namei.c:2891
 user_path_at include/linux/namei.h:57 [inline]
 bpf_obj_do_get kernel/bpf/inode.c:506 [inline]
 bpf_obj_get_user+0xb6/0x480 kernel/bpf/inode.c:541
 __sys_bpf+0x43c/0x670 kernel/bpf/syscall.c:4663
 __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: 0033:0x7f500f5ecfc9
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:00007f500d854038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f500f843fa0 RCX: 00007f500f5ecfc9
RDX: 0000000000000018 RSI: 0000200000001280 RDI: 0000000000000007
RBP: 00007f500f66ff91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f500f844038 R14: 00007f500f843fa0 R15: 00007ffcba412a78
 </TASK>