rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2670 jiffies s: 12937 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6352 Comm: syz.4.572 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:241 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x1b/0x80 kernel/kcov.c:309
Code: 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 90 48 8b 04 24 65 48 8b 15 44 2a 80 7e 65 8b 0d 45 2a 80 7e 81 e1 00 01 ff 00 74 11 <81> f9 00 01 00 00 75 5b 83 ba 1c 16 00 00 00 74 52 8b 8a f8 15 00
RSP: 0018:ffffc90000007c00 EFLAGS: 00000006
RAX: ffffffff81a5705a RBX: 0000000000000000 RCX: 0000000000000100
RDX: ffff88801b363c00 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 0000000000000000 R08: ffffffff8e2116af R09: 1ffffffff1c422d5
R10: dffffc0000000000 R11: fffffbfff1c422d6 R12: ffffe8ffffcbf000
R13: ffffffff8cb80460 R14: ffff8880b8e35518 R15: dffffc0000000000
FS:  00007f6b39acd6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000054a27000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 perf_swevent_put_recursion_context kernel/events/core.c:9771 [inline]
 perf_trace_run_bpf_submit+0x11a/0x1c0 kernel/events/core.c:10038
 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:variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
RIP: 0010:handle_softirqs+0x1b7/0x910 kernel/softirq.c:584
Code: 89 7c 24 2c 0f b7 db 48 c7 c7 80 0e 8b 8a e8 b0 0d e2 08 65 66 c7 05 26 52 b4 7e 00 00 e8 01 5a 39 00 fb 49 c7 c5 c0 a0 80 8c <89> 5c 24 34 b8 ff ff ff ff 0f bc 44 24 34 41 89 c6 41 ff c6 0f 84
RSP: 0018:ffffc90000007e20 EFLAGS: 00000282
RAX: 9dadffbb32c53100 RBX: 0000000000000200 RCX: 9dadffbb32c53100
RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: ffffffff8adf6420
RBP: ffffc90000007f30 R08: ffffffff90b13277 R09: 1ffffffff216264e
R10: dffffc0000000000 R11: fffffbfff216264f R12: dffffc0000000000
R13: ffffffff8c80a0c0 R14: ffff88801b363c00 R15: 000000000000000a
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:36 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline]
RIP: 0010:rcu_read_unlock_special+0xe4/0x510 kernel/rcu/tree_plugin.h:640
Code: 5e 41 5f 5d c3 49 89 ff 42 c6 44 2b 08 00 48 c7 84 24 80 00 00 00 00 00 00 00 9c 8f 84 24 80 00 00 00 4c 8b a4 24 80 00 00 00 <42> c6 44 2b 08 f8 fa 41 f7 c4 00 02 00 00 74 0f e8 67 a9 1b 00 66
RSP: 0018:ffffc90003c779a0 EFLAGS: 00000246
RAX: f2f2f2f8f1f1f1f1 RBX: 1ffff9200078ef3c RCX: 0000000000080000
RDX: ffffc9000e57a000 RSI: 00000000000003e6 RDI: ffff88801b363c00
RBP: ffffc90003c77aa0 R08: ffff88801b363c00 R09: 0000000000000002
R10: 0000000000000406 R11: 0000000000000002 R12: 0000000000000246
R13: dffffc0000000000 R14: 0000000080000000 R15: ffff88801b363c00
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 mt_find+0x605/0x830 lib/maple_tree.c:6558
 find_vma+0x12c/0x1b0 mm/mmap.c:1898
 lock_mm_and_find_vma+0x71/0x2f0 mm/memory.c:5385
 do_user_addr_fault+0x2e8/0xb20 arch/x86/mm/fault.c:1310
 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: 0010:__put_user_nocheck_4+0x3/0x11
Code: 00 00 48 39 d9 73 54 0f 01 cb 66 89 01 31 c9 0f 01 ca c3 90 90 90 90 90 48 bb fd ef ff ff ff 7f 00 00 48 39 d9 73 34 0f 01 cb <89> 01 31 c9 0f 01 ca c3 90 90 90 90 90 90 48 bb f9 ef ff ff ff 7f
RSP: 0018:ffffc90003c77e80 EFLAGS: 00050297
RAX: 000000000000000a RBX: 00007fffffffeffd RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8a8c2a20 RDI: ffffffff8adf6420
RBP: 000000000000000a R08: ffffffff8e2116af R09: 1ffffffff1c422d5
R10: dffffc0000000000 R11: fffffbfff1c422d6 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000002
 __sys_socketpair+0xb4/0x540 net/socket.c:1720
 __do_sys_socketpair net/socket.c:1786 [inline]
 __se_sys_socketpair net/socket.c:1783 [inline]
 __x64_sys_socketpair+0x97/0xb0 net/socket.c:1783
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6b38b9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6b39acd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f6b38e25fa0 RCX: 00007f6b38b9e159
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 00007f6b38c35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6b38e26038 R14: 00007f6b38e25fa0 R15: 00007ffc933a25f8
 </TASK>