rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=70cc/1/0x4000000000000000 softirq=133593/133593 fqs=5 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P26099/1:b..l rcu: (detected by 0, t=10502 jiffies, g=145409, q=311 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 26103 Comm: syz.7.6006 Not tainted 6.14.0-rc2-syzkaller-00041-g4dc1d1bec898 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:rb_add_cached include/linux/rbtree.h:182 [inline] RIP: 0010:timerqueue_add+0x1ec/0x290 lib/timerqueue.c:40 Code: 05 00 00 74 08 4c 89 ff e8 b1 7e 39 f6 4c 8b 7c 24 10 4e 89 7c 35 00 45 84 e4 75 40 e8 cd 6b d5 f5 31 db 4c 8b 64 24 08 eb 69 bf 6b d5 f5 ba 18 00 00 00 4c 89 ff 31 f6 e8 60 80 39 f6 48 b8 RSP: 0018:ffffc90000a18cd8 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 1ffff110170e58ca RCX: ffff888077795a00 RDX: 0000000000010000 RSI: ffff888035c88340 RDI: ffff888035c88340 RBP: 1ffff11006b91068 R08: ffffffff8be9e1db R09: 1ffffffff20346ce R10: dffffc0000000000 R11: fffffbfff20346cf R12: ffff8880b872c650 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888035c88340 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c35e90f CR3: 000000002a20c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000e02e DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __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:__sanitizer_cov_trace_const_cmp8+0x7d/0x90 kernel/kcov.c:323 Code: c1 e1 05 48 8d 41 28 4c 39 c8 77 1e 49 ff c2 4c 89 12 48 c7 44 11 08 07 00 00 00 48 89 7c 11 10 48 89 74 11 18 4c 89 44 11 20 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 RSP: 0018:ffffc90004d6f4a0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880418e3900 RCX: ffff888077795a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90004d6f801 R08: ffffffff8208fffc R09: 1ffffd40003d7136 R10: dffffc0000000000 R11: fffff940003d7137 R12: 800000007ae25025 R13: 000000000007ae25 R14: 000000110c33c000 R15: ffff888034e013e0 vm_normal_page+0x6c/0x200 mm/memory.c:598 zap_present_ptes mm/memory.c:1564 [inline] do_zap_pte_range mm/memory.c:1698 [inline] zap_pte_range mm/memory.c:1740 [inline] zap_pmd_range mm/memory.c:1823 [inline] zap_pud_range mm/memory.c:1852 [inline] zap_p4d_range mm/memory.c:1873 [inline] unmap_page_range+0xd77/0x48d0 mm/memory.c:1894 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1984 exit_mmap+0x283/0xd40 mm/mmap.c:1284 __mmput+0x115/0x410 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 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232 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: 0033:0x7f3081d8cde9 Code: Unable to access opcode bytes at 0x7f3081d8cdbf. RSP: 002b:00007ffca10b9a08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3081d8cde9 RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffca10b9a6c R08: 00000006a10b9aff R09: 00000000000927c0 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000174 R13: 00000000000927c0 R14: 00000000001f6ec9 R15: 00007ffca10b9ac0 task:syz.9.6004 state:R running task stack:25984 pid:26099 tgid:26099 ppid:25597 task_flags:0x40004c flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5377 [inline] __schedule+0x18bc/0x4c40 kernel/sched/core.c:6764 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6943 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6967 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] zap_pte_range mm/memory.c:1761 [inline] zap_pmd_range mm/memory.c:1823 [inline] zap_pud_range mm/memory.c:1852 [inline] zap_p4d_range mm/memory.c:1873 [inline] unmap_page_range+0x3d52/0x48d0 mm/memory.c:1894 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1984 exit_mmap+0x283/0xd40 mm/mmap.c:1284 __mmput+0x115/0x410 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 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232 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: 0033:0x7f4b0458cde9 RSP: 002b:00007ffd4094c4e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4b0458cde9 RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffd4094c54c R08: 000000074094c5df R09: 00000000000927c0 R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000001e R13: 00000000000927c0 R14: 00000000001f6efc R15: 00007ffd4094c5a0 rcu: rcu_preempt kthread starved for 10492 jiffies! g145409 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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:25752 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5377 [inline] __schedule+0x18bc/0x4c40 kernel/sched/core.c:6764 __schedule_loop kernel/sched/core.c:6841 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6856 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: 0 UID: 0 PID: 25417 Comm: syz-executor Not tainted 6.14.0-rc2-syzkaller-00041-g4dc1d1bec898 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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 b0 e8 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 60 e4 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 3b e4 0b 00 eb db 44 RSP: 0018:ffffc9000b777560 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 1ffff110170e88c9 RCX: ffff888049a89e00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000b777760 R08: ffffffff81b36ad0 R09: 1ffffffff2858d0e R10: dffffc0000000000 R11: fffffbfff2858d0f R12: ffff8880b863f9c8 R13: ffff8880b8744648 R14: ffff8880b863f9c0 R15: 0000000000000001 FS: 000055556cf17500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6a51cd56c0 CR3: 000000006ce10000 CR4: 00000000003526f0 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 dup_mmap kernel/fork.c:787 [inline] dup_mm kernel/fork.c:1700 [inline] copy_mm+0x18af/0x2160 kernel/fork.c:1752 copy_process+0x1845/0x3d50 kernel/fork.c:2403 kernel_clone+0x223/0x870 kernel/fork.c:2815 __do_sys_clone kernel/fork.c:2958 [inline] __se_sys_clone kernel/fork.c:2942 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2942 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: 0033:0x7f6a50f83653 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffdcfb455d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6a50f83653 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 000055556cf177d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000927c0 R14: 00000000001f6f63 R15: 00007ffdcfb45770