rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=beac/1/0x4000000000000000 softirq=41288/41288 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11173/1:b..l rcu: (detected by 0, t=10506 jiffies, g=39937, q=172 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 11164 Comm: syz.0.1456 Not tainted 6.13.0-syzkaller-01141-g62de6e168526 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:__kasan_check_write+0xa/0x20 mm/kasan/shadow.c:37 Code: ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 89 f6 48 8b 0c 24 01 00 00 00 e9 3c e6 ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 RSP: 0000:ffffc90000a18b78 EFLAGS: 00000097 RAX: 0000000000000004 RBX: dffffc0000000000 RCX: ffffffff817c3a72 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff8880586692e8 RBP: ffffc90000a18c60 R08: ffffffff942919a7 R09: 1ffffffff2852334 R10: dffffc0000000000 R11: fffffbfff2852335 R12: ffff8880586692e8 R13: 1ffff9200014317c R14: ffffc90000a18be0 R15: 1ffff1100b0cd25e FS: 00007fadb4fec6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f06cd561f44 CR3: 00000000342d4000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline] queued_spin_lock include/asm-generic/qspinlock.h:111 [inline] do_raw_spin_lock+0x142/0x370 kernel/locking/spinlock_debug.c:116 spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0xab/0xca0 net/sched/sch_taprio.c:924 __run_hrtimer kernel/time/hrtimer.c:1739 [inline] __hrtimer_run_queues+0x59b/0xd30 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865 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:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5247 Code: c9 50 e8 b9 0f 0c 00 48 83 c4 08 4c 89 f7 e8 fd 39 00 00 cc 1f 44 00 00 4c 89 f7 e8 80 8f 5a 0a e8 3b 9b 38 00 fb 48 8b 5d c0 <48> 8d bb f8 15 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc RSP: 0000:ffffc9000ceff588 EFLAGS: 00000282 RAX: 3ccd36de8887f200 RBX: ffff88802fc01e00 RCX: ffffffff9a398903 RDX: dffffc0000000000 RSI: ffffffff8c0a9380 RDI: ffffffff8c5f43e0 RBP: ffffc9000ceff5d0 R08: ffffffff901961b7 R09: 1ffffffff2032c36 R10: dffffc0000000000 R11: fffffbfff2032c37 R12: 1ffff110170e7eb4 R13: dffffc0000000000 R14: ffff8880b873e780 R15: ffff8880b873f5a0 context_switch kernel/sched/core.c:5376 [inline] __schedule+0x1822/0x4b90 kernel/sched/core.c:6760 __schedule_loop kernel/sched/core.c:6837 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6852 schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x355/0x620 kernel/sched/completion.c:148 rdmsr_safe_on_cpu+0x16c/0x310 arch/x86/lib/msr-smp.c:181 msr_read+0x15d/0x260 arch/x86/kernel/msr.c:66 vfs_read+0x1fc/0xb70 fs/read_write.c:563 ksys_read+0x18f/0x2b0 fs/read_write.c:708 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: 0033:0x7fadb4185d29 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:00007fadb4fec038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fadb4375fa0 RCX: 00007fadb4185d29 RDX: 0000000000019000 RSI: 0000000020003900 RDI: 0000000000000003 RBP: 00007fadb4201b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fadb4375fa0 R15: 00007ffdcf76bb38 task:syz.6.1458 state:R running task stack:22416 pid:11173 tgid:11172 ppid:9827 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5373 [inline] __schedule+0x181a/0x4b90 kernel/sched/core.c:6760 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6939 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6963 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:1705 [inline] zap_pmd_range mm/memory.c:1753 [inline] zap_pud_range mm/memory.c:1782 [inline] zap_p4d_range mm/memory.c:1803 [inline] unmap_page_range+0x36c3/0x4040 mm/memory.c:1824 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1914 exit_mmap+0x292/0xca0 mm/mmap.c:1672 __mmput+0x115/0x3b0 kernel/fork.c:1345 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+0x16b2/0x1750 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: 0033:0x7f384f185d29 RSP: 002b:00007f38500450e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f384f375fa8 RCX: 00007f384f185d29 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f384f375fa8 RBP: 00007f384f375fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f384f375fac R13: 0000000000000000 R14: 00007fffa1805b10 R15: 00007fffa1805bf8 rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g39937 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=38595 rcu: rcu_preempt kthread starved for 10506 jiffies! g39937 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:25104 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5373 [inline] __schedule+0x181a/0x4b90 kernel/sched/core.c:6760 __schedule_loop kernel/sched/core.c:6837 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6852 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244