rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=147/1/0x4000000000000002 softirq=88340/88341 fqs=5246 (detected by 1, t=10502 jiffies, g=137653, q=958) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1115 Comm: syz.5.8858 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 RIP: 0010:__sanitizer_cov_trace_pc+0x58/0x60 kernel/kcov.c:215 Code: 10 16 00 00 83 fa 02 75 21 48 8b 91 18 16 00 00 48 8b 32 48 8d 7e 01 8b 89 14 16 00 00 48 39 cf 73 08 48 89 44 f2 08 48 89 3a 0f 1f 80 00 00 00 00 48 8b 04 24 65 48 8b 0d c4 41 89 7e 65 8b RSP: 0018:ffffc900034ff1a8 EFLAGS: 00000093 RAX: ffffffff8198a0bd RBX: 0000000000000014 RCX: ffff888023b30000 RDX: 0000000000000000 RSI: 0000000000000014 RDI: 0000000000002000 RBP: ffffc900034ff2e8 R08: ffff8880b8e3b30b R09: 1ffff110171c7661 R10: dffffc0000000000 R11: ffffed10171c7662 R12: ffffe8ffffc36b08 R13: dffffc0000000000 R14: ffffc900034ff260 R15: ffffc900034ff280 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000053f00000000 CR3: 000000000ce8e000 CR4: 00000000003506f0 DR0: 00002000000003c0 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_swevent_get_recursion_context+0xd/0x150 kernel/events/core.c:9753 perf_trace_buf_alloc+0x54/0x300 kernel/trace/trace_event_perf.c:414 perf_trace_preemptirq_template+0x180/0x360 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674 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 d2 f6 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc900034ff3e0 EFLAGS: 00000206 RAX: 9eb384d337d09300 RBX: 1ffff9200069fe80 RCX: 9eb384d337d09300 RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a5100 RBP: ffffc900034ff4b0 R08: ffffffff910470c7 R09: 1ffffffff2208e18 R10: dffffc0000000000 R11: fffffbfff2208e19 R12: ffffffff8d123400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] __unlock_page_memcg+0xea/0x100 mm/memcontrol.c:2093 zap_pte_range mm/memory.c:1384 [inline] zap_pmd_range mm/memory.c:1505 [inline] zap_pud_range mm/memory.c:1534 [inline] zap_p4d_range mm/memory.c:1555 [inline] unmap_page_range+0xee4/0x2410 mm/memory.c:1576 unmap_vmas+0x131/0x250 mm/memory.c:1653 exit_mmap+0x3b9/0x640 mm/mmap.c:3224 __mmput+0x115/0x390 kernel/fork.c:1136 exit_mm+0x632/0x7b0 kernel/exit.c:557 do_exit+0x5b8/0x2100 kernel/exit.c:877 do_group_exit+0x12c/0x2f0 kernel/exit.c:1004 get_signal+0x7eb/0x12e0 kernel/signal.c:2917 arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:157 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217 __syscall_exit_to_user_mode_work kernel/entry/common.c:299 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:310 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f8d7e0b1b19 Code: Unable to access opcode bytes at RIP 0x7f8d7e0b1aef. RSP: 002b:00007f8d7c308028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffffa RBX: 00007f8d7e337fa0 RCX: 00007f8d7e0b1b19 RDX: 0000200000000040 RSI: 0000000000008953 RDI: 0000000000000006 RBP: 00007f8d7e149b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8d7e338038 R14: 00007f8d7e337fa0 R15: 00007ffdede29998