syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1 GPs behind) idle=c8d/1/0x4000000000000002 softirq=21131/21132 fqs=2095 
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8161
	(detected by 1, t=10506 jiffies, g=27137, q=1951)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8161 Comm: syz.2.1341 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:perf_output_begin_forward+0x1/0xa30 kernel/events/ring_buffer.c:270
Code: e8 c4 83 03 08 e8 2f 56 ca ff 48 c7 c7 60 c3 11 8c e8 f3 a9 fe ff 31 c0 5b 5d c3 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 00 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 00 01 00
RSP: 0018:ffffc9000310f670 EFLAGS: 00000046
RAX: 045a2a76aef86e00 RBX: ffff8880753e3bb0 RCX: 0000000000000008
RDX: ffff8880753e3bb0 RSI: ffffc9000310f880 RDI: ffffc9000310f6c0
RBP: ffffc9000310f790 R08: dffffc0000000000 R09: ffffc9000310f6c0
R10: fffff52000621edf R11: 1ffff92000621ed8 R12: ffffc9000310f6c0
R13: 1ffff92000621ed4 R14: ffffc9000310f6c0 R15: ffffc9000310f880
FS:  000055555aac0500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001f2000 CR3: 000000005973c000 CR4: 00000000003506f0
DR0: 0000200000000140 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 __perf_event_output kernel/events/core.c:7790 [inline]
 perf_event_output_forward+0x15c/0x280 kernel/events/core.c:7808
 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9501
 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10033
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10007
 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:671
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 7d 16 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:ffffc9000310fcc0 EFLAGS: 00000206
RAX: 045a2a76aef86e00 RBX: 1ffff92000621f9c RCX: 045a2a76aef86e00
RDX: dffffc0000000000 RSI: ffffffff8a0b15c0 RDI: ffffffff8a599340
RBP: ffffc9000310fd88 R08: dffffc0000000000 R09: fffffbfff1ff6e1a
R10: fffffbfff1ff6e1a R11: 1ffffffff1ff6e19 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8c1208a0
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock+0x85/0x90 include/linux/rcupdate.h:771
 dput+0xc0/0x1a0 fs/dcache.c:886
 __fput+0x5ee/0x930 fs/file_table.c:319
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f48df702be9
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:00007ffe4ab9b1f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000030aad RCX: 00007f48df702be9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f48df92bda0 R08: 0000000000000001 R09: 000000194ab9b4ef
R10: 0000001b31220000 R11: 0000000000000246 R12: 00007f48df929fac
R13: 00007f48df929fa0 R14: ffffffffffffffff R15: 00007ffe4ab9b310
 </TASK>
task:syz.2.1341      state:R  running task     stack:26336 pid: 8161 ppid:  4185 flags:0x0000400c
Call Trace:
 <TASK>
 </TASK>