rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=db7c/1/0x4000000000000002 softirq=26021/26024 fqs=5241 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7630 P7641/1:b..l (detected by 1, t=10502 jiffies, g=29497, q=14087 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7630 Comm: syz.0.3132 Not tainted 6.1.130-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x7c/0x80 kernel/kcov.c:315 Code: 8d 42 28 4c 39 c8 77 22 89 f8 89 f6 49 ff c2 4c 89 11 48 c7 44 0a 08 05 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 0f 1f 00 4c 8b 04 24 65 48 8b 0d d4 d1 77 7e 65 8b 05 d5 d1 77 RSP: 0018:ffffc90003a2f090 EFLAGS: 00000093 RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffff88805d2d9dc0 RDX: ffff88805d2d9dc0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88807a1dfc78 R08: ffffffff81b089a2 R09: ffffed100f43bf90 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88807a1df800 R15: dffffc0000000000 FS: 0000555582e43500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000059d17000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __perf_event_overflow+0xd2/0x640 kernel/events/core.c:9430 perf_tp_event+0x35a/0xc80 kernel/events/core.c:10006 perf_trace_run_bpf_submit+0xf7/0x1d0 kernel/events/core.c:9979 perf_trace_preemptirq_template+0x2d1/0x3d0 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0xd5/0x140 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+0x84/0x540 kernel/rcu/tree_plugin.h:682 Code: f1 f1 f1 00 f2 f2 f2 49 89 04 17 66 41 c7 44 17 09 f3 f3 41 c6 44 17 0b f3 65 44 8b 25 6d 1a 8e 7e 41 f7 c4 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 3a 00 00 00 00 66 42 c7 44 3a RSP: 0018:ffffc90003a2f620 EFLAGS: 00000206 RAX: 0ffd4341b6611b00 RBX: 1ffff92000745ecc RCX: ffffffff816b145a RDX: dffffc0000000000 RSI: ffffffff8b0c1d40 RDI: ffffffff8b5f6f80 RBP: ffffc90003a2f6f8 R08: dffffc0000000000 R09: fffffbfff2257260 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff88805d2da218 R14: ffffc90003a2f660 R15: 1ffff92000745ec8 __rcu_read_unlock+0x92/0x100 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] d_alloc_parallel+0x1282/0x1590 fs/dcache.c:2734 lookup_open fs/namei.c:3407 [inline] open_last_lookups fs/namei.c:3550 [inline] path_openat+0x90a/0x2e60 fs/namei.c:3780 do_filp_open+0x230/0x480 fs/namei.c:3810 do_sys_openat2+0x13b/0x4f0 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9d6118bad0 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44 RSP: 002b:00007ffcf23a47a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9d6118bad0 RDX: 0000000000000000 RSI: 00007ffcf23a4830 RDI: 00000000ffffff9c RBP: 00007ffcf23a4830 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f9d613a5fa0 R14: 00007f9d613a5fa0 R15: 0000000000000002 task:syz-executor state:R running task stack:27008 pid:7641 ppid:4386 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5243 [inline] __schedule+0x143f/0x4570 kernel/sched/core.c:6560 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872 irqentry_exit+0x53/0x80 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:instrument_atomic_read include/linux/instrumented.h:72 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] RIP: 0010:bit_spin_lock include/linux/bit_spinlock.h:31 [inline] RIP: 0010:hlist_bl_lock+0xaa/0x120 include/linux/list_bl.h:148 Code: 7e 31 ff 44 89 f6 e8 a5 de 92 ff 45 85 f6 74 07 e8 3b db 92 ff eb 11 e8 34 db 92 ff e8 9f d4 08 ff eb 05 e8 28 db 92 ff f3 90 <4c> 89 e7 be 08 00 00 00 e8 39 3f ea ff 42 80 7c 3d 00 00 74 08 4c RSP: 0018:ffffc90003d1f710 EFLAGS: 00000293 RAX: ffffffff81f7be58 RBX: ffff888068523700 RCX: ffff8880291fd940 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9748b290 RBP: 1ffffffff2e91652 R08: dffffc0000000000 R09: fffffbfff2e91653 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff9748b290 R13: dffffc0000000000 R14: 0000000080000000 R15: dffffc0000000000 d_alloc_parallel+0x47a/0x1590 fs/dcache.c:2681 lookup_open fs/namei.c:3407 [inline] open_last_lookups fs/namei.c:3550 [inline] path_openat+0x90a/0x2e60 fs/namei.c:3780 do_filp_open+0x230/0x480 fs/namei.c:3810 do_sys_openat2+0x13b/0x4f0 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3d8418bad0 RSP: 002b:00007ffeb8a05830 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000080001 RCX: 00007f3d8418bad0 RDX: 0000000000080001 RSI: 00007f3d8420fadc RDI: 00000000ffffff9c RBP: 00007f3d8420fadc R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000004 R13: 00007ffeb8a058d0 R14: 000000000005592d R15: 00007ffeb8a05e40 task:syz.0.3132 state:R running task stack:25672 pid:7630 ppid:4377 flags:0x0000400c Call Trace: