syzbot

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=b21c/1/0x4000000000000000 softirq=34016/556508 fqs=5128
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  3360693     267186            0
rcu: 	cputime:    31828      19998          654   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=38621 q=1849 ncpus=2)
CPU: 0 PID: 9870 Comm: syz.2.1368 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 8c f1 c4 0c 48 89 de 5b e9 63 75 56 00 cc cc cc <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d 60 24 7e 7e 65 8b 15 61 24 7e
RSP: 0018:ffffc90000007490 EFLAGS: 00000206
RAX: 0000000000000014 RBX: 0000005163e611ca RCX: ffff8880241d8000
RDX: 0000000000000100 RSI: ffffffff8cd79100 RDI: 0000000000000004
RBP: 0000000000000848 R08: ffff8880241d8000 R09: 0000000000000020
R10: 000000000000001f R11: 0000000000000100 R12: 0000000000000294
R13: f800000000000000 R14: 0000000000000294 R15: 0000005163e67b5e
FS:  00007fb5376346c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e517ff8 CR3: 0000000026532000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 check_buffer+0x556/0x950 kernel/trace/ring_buffer.c:3491
 __rb_reserve_next+0x511/0xd50 kernel/trace/ring_buffer.c:3624
 rb_reserve_next_event kernel/trace/ring_buffer.c:3759 [inline]
 ring_buffer_lock_reserve+0xae1/0xed0 kernel/trace/ring_buffer.c:3818
 __trace_buffer_lock_reserve kernel/trace/trace.c:992 [inline]
 trace_event_buffer_lock_reserve+0x1d0/0x6e0 kernel/trace/trace.c:2902
 trace_event_buffer_reserve+0x29b/0x3c0 kernel/trace/trace_events.c:661
 do_trace_event_raw_event_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
 trace_event_raw_event_bpf_trace_printk+0x101/0x210 kernel/trace/bpf_trace.h:11
 trace_bpf_trace_printk+0x142/0x1a0 kernel/trace/bpf_trace.h:11
 ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline]
 bpf_trace_printk+0x11f/0x190 kernel/trace/bpf_trace.c:371
 bpf_prog_0605f9f479290f07+0x37/0x3b
 bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline]
 __bpf_prog_run include/linux/filter.h:612 [inline]
 bpf_prog_run include/linux/filter.h:619 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline]
 bpf_trace_run1+0x1c9/0x3b0 kernel/trace/bpf_trace.c:2360
 __bpf_trace_rcu_utilization+0xa2/0xe0 include/trace/events/rcu.h:27
 trace_rcu_utilization+0x179/0x1a0 include/trace/events/rcu.h:27
 rcu_core+0x1341/0x1720 kernel/rcu/tree.c:2475
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0xa1/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:7010
Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 cb 12 e6 f6 e8 16 99 16 f7 fb bf 01 00 00 00 <e8> db b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc900193bf520 EFLAGS: 00000282
RAX: f3b7c3e1c75b9500 RBX: 0000000000000000 RCX: f3b7c3e1c75b9500
RDX: dffffc0000000000 RSI: ffffffff8aaaba40 RDI: 0000000000000001
RBP: ffffc900193bf5c0 R08: ffffffff90da35cf R09: 1ffffffff21b46b9
R10: dffffc0000000000 R11: fffffbfff21b46ba R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92003277ea4
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_release+0x57c/0x8b0 kernel/locking/lockdep.c:5778
Code: 00 00 00 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 75 75 f7 44 24 50 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 2f 00 00 00 00 66 43 c7 44 2f 09 00 00 43 c6 44 2f 0b 00
RSP: 0018:ffffc900193bf680 EFLAGS: 00000206
RAX: 0000000000000001 RBX: c097c23dfe07078d RCX: f3b7c3e1c75b9500
RDX: 0000000000000003 RSI: ffffffff8aaacbc0 RDI: ffffffff8afc6780
RBP: ffffc900193bf798 R08: ffffffff8e4a84ef R09: 1ffffffff1c9509d
R10: dffffc0000000000 R11: fffffbfff1c9509e R12: ffff8880241d8b58
R13: dffffc0000000000 R14: ffff8880241d8ad0 R15: 1ffff92003277edc
 up_write+0x2d/0x410 kernel/locking/rwsem.c:1625
 vma_start_write include/linux/mm.h:730 [inline]
 dup_userfaultfd+0x270/0x800 fs/userfaultfd.c:695
 dup_mmap kernel/fork.c:723 [inline]
 dup_mm kernel/fork.c:1692 [inline]
 copy_mm+0xcb3/0x1c20 kernel/fork.c:1741
 copy_process+0x16d3/0x3d70 kernel/fork.c:2506
 kernel_clone+0x21b/0x840 kernel/fork.c:2914
 __do_sys_clone kernel/fork.c:3057 [inline]
 __se_sys_clone kernel/fork.c:3041 [inline]
 __x64_sys_clone+0x18c/0x1e0 kernel/fork.c:3041
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb53678ebe9
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:00007fb537633fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fb5369b5fa0 RCX: 00007fb53678ebe9
RDX: 00002000000006c0 RSI: 0000000000000000 RDI: 0000000001001200
RBP: 00007fb536811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fb5369b6038 R14: 00007fb5369b5fa0 R15: 00007ffd6d1a5008
 </TASK>