rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1 GPs behind) idle=623/1/0x4000000000000000 softirq=72149/72150 fqs=5245 
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P22072
	(detected by 1, t=10502 jiffies, g=110981, q=1134)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 22072 Comm: syz.4.4186 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:172 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:227 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x2a/0x80 kernel/kcov.c:293
Code: 48 8b 04 24 65 48 8b 0d b4 79 89 7e 65 8b 15 b5 79 89 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 5b 83 b9 34 16 00 00 00 <74> 52 8b 91 10 16 00 00 83 fa 03 75 47 48 8b 91 18 16 00 00 44 8b
RSP: 0018:ffffc90000007c58 EFLAGS: 00000046
RAX: ffffffff817f15bf RBX: 0000607f46c35570 RCX: ffff888026b81dc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000008
RBP: ffffc90000007d28 R08: ffff8880b903b30b R09: 1ffff11017207661
R10: dffffc0000000000 R11: ffffed1017207662 R12: 0000000000000000
R13: ffffffff8c369c80 R14: 0000000000000000 R15: 1ffff92000000f90
FS:  00007f83be22a6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34916ff8 CR3: 000000001fb36000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 perf_trace_preemptirq_template+0xbf/0x360 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:ffs arch/x86/include/asm/bitops.h:297 [inline]
RIP: 0010:handle_softirqs+0x1a4/0x830 kernel/softirq.c:564
Code: 24 78 44 89 64 24 30 0f b7 db 48 c7 c7 e0 13 2a 8a e8 30 fc 75 08 65 66 c7 05 86 6d ba 7e 00 00 e8 01 ef 35 00 fb 89 5c 24 3c <b8> ff ff ff ff 0f bc 44 24 3c 41 89 c6 41 ff c6 0f 85 d2 00 00 00
RSP: 0018:ffffc90000007e20 EFLAGS: 00000282
RAX: b72c754b8ed43100 RBX: 0000000000000200 RCX: b72c754b8ed43100
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a2840
RBP: ffffc90000007f30 R08: ffffffff901e916f R09: 1ffffffff203d22d
R10: dffffc0000000000 R11: fffffbfff203d22e R12: 000000000000000a
R13: 0000000000000000 R14: ffff888026b81dc0 R15: dffffc0000000000
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 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:rcu_read_unlock_special+0x1/0x4a0 kernel/rcu/tree_plugin.h:625
Code: c6 58 00 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 94 49 89 fd 4c 89 f7 e8 3c c6 58 00 4c 89 ef eb 84 0f 1f 80 00 00 00 00 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec a0 00 00
RSP: 0018:ffffc900014ff470 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff888026b821fc RCX: b72c754b8ed43100
RDX: 0000000000000002 RSI: ffffffff8a7a2820 RDI: ffff888026b81dc0
RBP: 0000000000000cc0 R08: ffffffff8d8aee2f R09: 1ffffffff1b15dc5
R10: dffffc0000000000 R11: fffffbfff1b15dc6 R12: 1ffff11004d7043f
R13: ffff88805dbd8eb0 R14: ffff888026b82200 R15: dffffc0000000000
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 get_obj_cgroup_from_current+0x2ba/0x2f0 mm/memcontrol.c:2934
 memcg_slab_pre_alloc_hook mm/slab.h:283 [inline]
 slab_pre_alloc_hook+0x7d/0xc0 mm/slab.h:497
 slab_alloc_node mm/slub.c:3139 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x3d/0x280 mm/slub.c:3238
 proc_alloc_inode+0x19/0xa0 fs/proc/inode.c:69
 alloc_inode fs/inode.c:261 [inline]
 new_inode_pseudo+0x5f/0x210 fs/inode.c:1001
 new_inode+0x25/0x1d0 fs/inode.c:1030
 proc_pid_make_inode+0x20/0x1a0 fs/proc/base.c:1957
 proc_pident_instantiate+0x69/0x2a0 fs/proc/base.c:2698
 proc_pident_lookup+0x1cb/0x270 fs/proc/base.c:2734
 __lookup_slow+0x29d/0x410 fs/namei.c:1671
 lookup_slow+0x53/0x70 fs/namei.c:1688
 walk_component+0x314/0x460 fs/namei.c:1984
 link_path_walk+0x688/0xde0 fs/namei.c:-1
 path_openat+0x28e/0x2fb0 fs/namei.c:3746
 do_filp_open+0x1df/0x400 fs/namei.c:3777
 do_sys_openat2+0x14b/0x500 fs/open.c:1255
 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: 0033:0x7f83bff9268e
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:00007f83be229ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f83be22a6c0 RCX: 00007f83bff9268e
RDX: 0000000000000002 RSI: 00007f83be229f90 RDI: ffffffffffffff9c
RBP: 00007f83c0067e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f83c025a038 R14: 00007f83c0259fa0 R15: 00007fffbd8c7f88
 </TASK>
task:syz.4.4186      state:R  running task     stack:25648 pid:22072 ppid: 18610 flags:0x0000400c
Call Trace:
 <TASK>
 </TASK>