rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 ticks this GP) idle=c16c/1/0x4000000000000000 softirq=17699/17699 fqs=4 rcu: (detected by 1, t=10502 jiffies, g=14141, q=974 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7535 Comm: modprobe Not tainted 6.14.0-rc5-syzkaller-00125-gdf8ce77ba8b7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:debug_object_activate+0x97/0x580 lib/debugobjects.c:806 Code: f1 f1 f1 f1 43 c7 44 35 09 f3 f3 f3 f3 66 43 c7 44 35 0d f3 f3 43 c6 44 35 0f f3 48 8d 5c 24 70 ba 10 00 00 00 4c 89 e7 31 f6 54 b4 2c fd 48 89 d8 48 c1 e8 03 48 89 44 24 38 42 0f b6 04 30 RSP: 0018:ffffc90000007be0 EFLAGS: 00000046 RAX: 4d08d32610fd5600 RBX: ffffc90000007c50 RCX: ffff888061469e00 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000007c40 RBP: ffffc90000007cf8 R08: ffffffff81af0c32 R09: fffff52000000f84 R10: dffffc0000000000 R11: fffff52000000f84 R12: ffffc90000007c40 R13: 1ffff92000000f84 R14: dffffc0000000000 R15: ffff88805f985340 FS: 00007fd0a9928380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd0a9b1c8e5 CR3: 000000003337c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_hrtimer_activate kernel/time/hrtimer.c:455 [inline] debug_activate kernel/time/hrtimer.c:496 [inline] enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1100 __run_hrtimer kernel/time/hrtimer.c:1818 [inline] __hrtimer_run_queues+0x6cb/0xd30 kernel/time/hrtimer.c:1865 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x86/0x290 mm/kasan/generic.c:189 Code: 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd 41 80 3b 00 <0f> 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00 00 45 89 dc RSP: 0018:ffffc90003977870 EFLAGS: 00000246 RAX: ffffffff821a0001 RBX: 1ffff9200072ef28 RCX: ffffffff821a008b RDX: 0000000000000001 RSI: 0000000000000040 RDI: ffffc90003977940 RBP: fffffffffffffffa R08: ffffc9000397797f R09: 1ffff9200072ef2f R10: dffffc0000000000 R11: fffff5200072ef2a R12: dffffc0000000000 R13: ffffc90003977940 R14: dffffc0000000001 R15: fffff5200072ef30 __asan_memset+0x23/0x50 mm/kasan/shadow.c:84 __split_vma+0x9b/0xbf0 mm/vma.c:453 split_vma mm/vma.c:542 [inline] vma_modify+0x244/0x330 mm/vma.c:1529 vma_modify_flags+0x3a5/0x430 mm/vma.c:1547 mprotect_fixup+0x45a/0xaa0 mm/mprotect.c:666 do_mprotect_pkey+0x99d/0xdd0 mm/mprotect.c:840 __do_sys_mprotect mm/mprotect.c:861 [inline] __se_sys_mprotect mm/mprotect.c:858 [inline] __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:858 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd0a9c4cbb7 Code: 00 00 00 b8 0b 00 00 00 0f 05 48 3d 01 f0 ff ff 73 01 c3 48 8d 0d b9 46 01 00 f7 d8 89 01 48 83 c8 ff c3 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d 99 46 01 00 f7 d8 89 01 48 83 RSP: 002b:00007ffed22076f8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a RAX: ffffffffffffffda RBX: 00007fd0a9c290c0 RCX: 00007fd0a9c4cbb7 RDX: 0000000000000001 RSI: 0000000000003000 RDI: 00007fd0a9c25000 RBP: 00007ffed2207810 R08: 00007ffed2207688 R09: 00007fd0a9c290c0 R10: 00007fd0a9b6ab48 R11: 0000000000000206 R12: 00007fd0a9c290c0 R13: 00007fd0a9c54eda R14: 00007fd0a9c27f28 R15: 00007fd0a9c272b8 rcu: rcu_preempt kthread starved for 2612 jiffies! g14141 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:26104 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0x190e/0x4c90 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6857 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 7530 Comm: syz.0.449 Not tainted 6.14.0-rc5-syzkaller-00125-gdf8ce77ba8b7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x1bb2/0x2d30 kernel/smp.c:885 Code: 01 31 ff e8 c0 f4 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 70 f0 0b 00 eb 41 f3 90 48 b8 00 00 00 00 00 fc ff df 0f b6 04 03 <84> c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 4b f0 0b 00 eb db 44 RSP: 0018:ffffc90003c76f40 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 1ffff110170c8c99 RCX: ffff88807afe3c00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003c77140 R08: ffffffff81b5de30 R09: 1ffffffff2079ece R10: dffffc0000000000 R11: ffffffff816aa0d0 R12: ffff8880b873fb48 R13: ffff8880b86464c8 R14: ffff8880b873fb40 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000000940 CR3: 0000000022716000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:966 [inline] flush_tlb_mm_range+0x42d/0x710 arch/x86/mm/tlb.c:1054 tlb_flush arch/x86/include/asm/tlb.h:20 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:481 [inline] zap_pte_range mm/memory.c:1769 [inline] zap_pmd_range mm/memory.c:1834 [inline] zap_pud_range mm/memory.c:1863 [inline] zap_p4d_range mm/memory.c:1884 [inline] unmap_page_range+0x386a/0x4510 mm/memory.c:1905 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1995 exit_mmap+0x283/0xd40 mm/mmap.c:1284 __mmput+0x115/0x420 kernel/fork.c:1356 exit_mm+0x220/0x310 kernel/exit.c:570 do_exit+0x9ad/0x28e0 kernel/exit.c:925 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 get_signal+0x168c/0x1720 kernel/signal.c:3036 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa50038d169 Code: Unable to access opcode bytes at 0x7fa50038d13f. RSP: 002b:00007fff9b7a33f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffff92 RBX: 000000000001afc1 RCX: 00007fa50038d169 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa5005a5fac RBP: 0000000000000032 R08: 7fffffffffffffff R09: 000000079b7a36ef R10: 00007fff9b7a34f0 R11: 0000000000000246 R12: 00007fa5005a5fac R13: 00007fff9b7a34f0 R14: 000000000001aff3 R15: 00007fff9b7a3510