rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-....: (0 ticks this GP) idle=fb04/1/0x4000000000000000 softirq=42213/42221 fqs=2100 rcu: hardirqs softirqs csw/system rcu: number: 9820418 0 0 rcu: cputime: 22603 0 0 ==> 52550(ms) rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10087 rcu: (detected by 0, t=10506 jiffies, g=44497, q=447 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10087 Comm: syz.2.722 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x0/0x80 kernel/kcov.c:321 Code: c0 4c 89 01 48 c7 44 11 08 05 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f 1e fa 48 8b 04 24 65 48 8b 0d b0 20 7e 7e 65 8b 15 b1 20 7e RSP: 0018:ffffc90004dc6a48 EFLAGS: 00000046 RAX: ffffffff818911cd RBX: 0000000000000001 RCX: ffff888018b31e00 RDX: 0000000040000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffc90004dc6d0f R09: 0000000000000000 R10: ffffc90004dc6d00 R11: fffff520009b8da2 R12: 0000000000000002 R13: 1ffff920009b8d54 R14: 0000000000000002 R15: dffffc0000000000 FS: 00007f8876c346c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000029c0 CR3: 000000002fc62000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: tracing_gen_ctx_irq_test+0x41/0x140 kernel/trace/trace.c:2701 tracing_gen_ctx_flags include/linux/trace_events.h:195 [inline] tracing_gen_ctx include/linux/trace_events.h:202 [inline] perf_trace_buf_update+0xa0/0x220 kernel/trace/trace_event_perf.c:429 perf_tp_event+0xf9/0x13a0 kernel/events/core.c:10330 perf_trace_run_bpf_submit+0xf4/0x1c0 kernel/events/core.c:10268 perf_trace_preemptirq_template+0x281/0x340 include/trace/events/preemptirq.h:14 trace_irq_enable+0xbf/0xe0 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723 RIP: 0010:finish_task_switch+0x26a/0x920 kernel/sched/core.c:5254 Code: 0f 84 37 01 00 00 48 85 db 0f 85 56 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 80 ca 14 09 e8 4b a4 2f 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc90004dc6fd8 EFLAGS: 00000286 RAX: e04d9859073c3200 RBX: 0000000000000000 RCX: e04d9859073c3200 RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: ffffffff8afc6f80 RBP: ffffc90004dc7030 R08: ffffffff90d94537 R09: 1ffffffff21b28a6 R10: dffffc0000000000 R11: fffffbfff21b28a7 R12: ffff888018b31e00 R13: dffffc0000000000 R14: ffff88802c7c8000 R15: ffff8880b8f3cac8 context_switch kernel/sched/core.c:5383 [inline] __schedule+0x14da/0x44d0 kernel/sched/core.c:6699 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009 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:check_kcov_mode kernel/kcov.c:184 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x30/0x60 kernel/kcov.c:216 Code: 04 24 65 48 8b 0d f0 24 7e 7e 65 8b 15 f1 24 7e 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 74 2c <8b> 91 f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 RSP: 0018:ffffc90004dc73b8 EFLAGS: 00000246 RAX: ffffffff8a54a013 RBX: 0000000000000300 RCX: ffff888018b31e00 RDX: 0000000000000000 RSI: 0000000000000300 RDI: 0000000000000300 RBP: ffff88802c44c80c R08: ffff888018b31e00 R09: 0000000000000003 R10: 0000000000000002 R11: 0000000000000002 R12: 0000000000000000 R13: 0000200000ffffff R14: ffff88802d8a27a0 R15: 0000000000000000 mt_locked lib/maple_tree.c:807 [inline] mt_slot lib/maple_tree.c:814 [inline] mtree_range_walk+0x4b3/0x7c0 lib/maple_tree.c:2820 mas_state_walk lib/maple_tree.c:3714 [inline] mt_find+0x22b/0x5b0 lib/maple_tree.c:6548 find_vma+0x12e/0x1b0 mm/mmap.c:1888 lock_mm_and_find_vma+0x5f/0x300 mm/memory.c:5443 do_user_addr_fault+0x36c/0x12e0 arch/x86/mm/fault.c:1345 handle_page_fault arch/x86/mm/fault.c:1465 [inline] exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:71 Code: 75 f1 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 a4 c3 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 RSP: 0018:ffffc90004dc7818 EFLAGS: 00050206 RAX: ffffffff841d0301 RBX: 0000000000008000 RCX: 0000000000001140 RDX: 0000000000000001 RSI: 00002000002e7000 RDI: ffff88807b0beec0 RBP: ffffc90004dc7970 R08: ffff88807b0bffff R09: 1ffff1100f617fff R10: dffffc0000000000 R11: ffffed100f618000 R12: ffff88807b0b8000 R13: 00002000002e0140 R14: ffffc90004dc7c18 R15: 1ffff920009b8f83 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:127 [inline] copyin lib/iov_iter.c:193 [inline] _copy_from_iter+0x248/0x1290 lib/iov_iter.c:390 copy_from_iter include/linux/uio.h:209 [inline] copy_from_iter_full include/linux/uio.h:216 [inline] skb_do_copy_data_nocache include/net/sock.h:2329 [inline] skb_copy_to_page_nocache include/net/sock.h:2355 [inline] kcm_sendmsg+0xd87/0x2880 net/kcm/kcmsock.c:858 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] sock_write_iter+0x2bb/0x3f0 net/socket.c:1160 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x43b/0x940 fs/read_write.c:584 ksys_write+0x147/0x250 fs/read_write.c:637 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: 0033:0x7f8875d8f749 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:00007f8876c34038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f8875fe5fa0 RCX: 00007f8875d8f749 RDX: 00000000fffffdef RSI: 0000200000000140 RDI: 0000000000000008 RBP: 00007f8875e13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8875fe6038 R14: 00007f8875fe5fa0 R15: 00007fff9dbcdb58 task:syz.2.722 state:R running task stack:24488 pid:10087 ppid:9100 flags:0x0000400c Call Trace: