rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2686 jiffies s: 717 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4346 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
RIP: 0010:lock_release+0x565/0x920 kernel/locking/lockdep.c:5684
Code: 24 10 48 8b 54 24 30 e8 f9 6b 00 00 4c 8b 7c 24 18 48 c7 c7 20 29 8c 8a e8 c8 75 c6 08 b8 ff ff ff ff 65 0f c1 05 8b ff 9d 7e <83> f8 01 75 7f 43 c6 44 2f 04 00 48 c7 84 24 80 00 00 00 00 00 00
RSP: 0000:ffffc90003e97560 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 84bc2774c9314fb7 RCX: 57b754b40f07a700
RDX: 0000000000000003 RSI: ffffffff8a8c2920 RDI: ffffffff8adee1a0
RBP: ffffc90003e97670 R08: ffffffff8e200f6f R09: 1ffffffff1c401ed
R10: dffffc0000000000 R11: fffffbfff1c401ee R12: ffff888077ebe558
R13: dffffc0000000000 R14: ffff888077ebe4d0 R15: 1ffff920007d2eb8
FS:  00007fdc3fc33880(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffebf4951a8 CR3: 000000001e659000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_lock_release include/linux/rcupdate.h:355 [inline]
 rcu_read_unlock include/linux/rcupdate.h:824 [inline]
 trace_call_bpf+0x5ca/0x6b0 kernel/trace/bpf_trace.c:137
 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10027
 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 e2 82 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0000:ffffc90003e979a0 EFLAGS: 00000206
RAX: 57b754b40f07a700 RBX: 1ffff920007d2f3c RCX: 57b754b40f07a700
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adee1a0
RBP: ffffc90003e97a90 R08: ffffffff90af2247 R09: 1ffffffff215e448
R10: dffffc0000000000 R11: fffffbfff215e449 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3bb00 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 page_ext_put+0x91/0xb0 mm/page_ext.c:182
 page_table_check_pte_set include/linux/page_table_check.h:83 [inline]
 set_pte_at arch/x86/include/asm/pgtable.h:1009 [inline]
 wp_page_copy+0x13a0/0x1660 mm/memory.c:3228
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x1b1b/0x3d40 mm/memory.c:5292
 do_user_addr_fault+0x58e/0xb20 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x559efaebb40a
Code: 0f 85 2e 02 00 00 48 81 c4 38 44 00 00 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 84 00 00 00 00 00 c6 87 b8 01 00 00 01 48 89 fd <e8> b1 11 00 00 48 89 c1 48 85 c0 0f 84 d2 01 00 00 4c 8d 74 24 20
RSP: 002b:00007ffebf4951b0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000559f36f1a410 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000559efaec7663 RDI: 0000559f36f2c690
RBP: 0000559f36f2c690 R08: 0000559f36f15140 R09: 0000559efaede140
R10: 0000003333496d62 R11: 00000000000040be R12: 000000000aba9500
R13: 0000000003938700 R14: 0000559efaede100 R15: 0000559efaede140
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.435 msecs