rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...0: (0 ticks this GP) idle=bd1c/1/0x4000000000000000 softirq=59184/59184 fqs=1603 rcu: hardirqs softirqs csw/system rcu: number: 0 0 0 rcu: cputime: 0 0 0 ==> 52550(ms) rcu: (detected by 0, t=10506 jiffies, g=46425, q=1352 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6206 Comm: syz-executor Not tainted 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 7e 60 e8 a3 ff ff ff 31 c0 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 65 48 8b 15 94 60 76 7e 65 8b 05 95 60 76 7e a9 00 01 RSP: 0018:ffffc90000a18c70 EFLAGS: 00000006 RAX: 0000000080010101 RBX: ffff8880b872cac0 RCX: 0000000000000000 RDX: ffff888027b58000 RSI: ffffffff817a987f RDI: 0000000000000001 RBP: ffff88807d89e340 R08: 0000000000000000 R09: fffffbfff35557fd R10: ffffc90000a18c78 R11: ffffffff8b6f86c0 R12: ffff88807d89e340 R13: 000000000003dc0c R14: 0000000000000000 R15: ffffffff8932ae70 FS: 00005555566d4500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f06a98656c0 CR3: 00000000712b8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hrtimer_start include/trace/events/timer.h:222 [inline] debug_activate kernel/time/hrtimer.c:479 [inline] enqueue_hrtimer+0x3b/0x3c0 kernel/time/hrtimer.c:1085 __run_hrtimer kernel/time/hrtimer.c:1708 [inline] __hrtimer_run_queues+0x903/0xae0 kernel/time/hrtimer.c:1755 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1817 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:handle_softirqs+0x1da/0x8f0 kernel/softirq.c:540 Code: 89 44 24 18 48 89 6c 24 10 48 c7 c7 a0 70 6b 8b e8 1b 62 d3 09 65 66 c7 05 39 71 b3 7e 00 00 e8 3c c1 44 00 fb bb ff ff ff ff <49> c7 c6 c0 a0 e0 8d 41 0f bc dc 83 c3 01 0f 85 a4 00 00 00 e9 b1 RSP: 0018:ffffc90000a18f30 EFLAGS: 00000206 RAX: 0000000000162d72 RBX: 00000000ffffffff RCX: 1ffffffff2dce74d RDX: 0000000000000000 RSI: ffffffff8b6ccfc0 RDI: ffffffff8bd1b6c0 RBP: ffff888027b58000 R08: 0000000000000001 R09: fffffbfff2dc5d9d R10: ffffffff96e2ecef R11: 0000000000000000 R12: 0000000000000200 R13: 000000000000000a R14: 0000000000000001 R15: 0000000000000000 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline] sysvec_call_function_single+0xa4/0xc0 arch/x86/kernel/smp.c:266 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709 RIP: 0010:obj_cgroup_put include/linux/memcontrol.h:827 [inline] RIP: 0010:mod_objcg_state+0x2e3/0x8d0 mm/memcontrol.c:2747 Code: 0f 85 e2 04 00 00 48 03 1c ed 80 5b a6 8d 48 89 df e8 91 6f ff ff 4d 85 e4 0f 85 e7 01 00 00 9c 58 f6 c4 02 0f 85 a7 03 00 00 <4d> 85 f6 0f 84 c0 01 00 00 e8 7f ef 7b ff 31 d2 45 31 c9 45 31 c0 RSP: 0018:ffffc9000b34f938 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff8880b8739b40 RCX: 1ffffffff2dce74d RDX: 0000000000000000 RSI: ffffffff8b6ccfc0 RDI: ffffffff8bd1b6c0 RBP: 0000000000000001 R08: 0000000000000001 R09: fffffbfff2dc5d9d R10: ffffffff96e2ecef R11: 0000000000000000 R12: 0000000000000200 R13: ffff8880b8739b40 R14: 0000000000000000 R15: ffff8880b8739b98 __memcg_slab_post_alloc_hook+0x4fc/0x9b0 mm/memcontrol.c:2994 memcg_slab_post_alloc_hook mm/slub.c:2156 [inline] slab_post_alloc_hook mm/slub.c:4095 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_noprof+0x2c6/0x2f0 mm/slub.c:4141 anon_vma_chain_alloc mm/rmap.c:143 [inline] anon_vma_fork+0x200/0x620 mm/rmap.c:365 dup_mmap kernel/fork.c:709 [inline] dup_mm kernel/fork.c:1675 [inline] copy_mm kernel/fork.c:1724 [inline] copy_process+0x8406/0x8cb0 kernel/fork.c:2374 kernel_clone+0xfd/0x960 kernel/fork.c:2786 __do_sys_clone+0xba/0x100 kernel/fork.c:2929 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f06a8b74f93 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:00007fffd2444da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f06a8b74f93 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00005555566d47d0 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000005cff6 R14: 000000000005cfd3 R15: 00007fffd2444f30 rcu: rcu_preempt kthread starved for 2490 jiffies! g46425 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:27504 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0xe55/0x5740 kernel/sched/core.c:6693 __schedule_loop kernel/sched/core.c:6770 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6785 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2615 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2045 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2247 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 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: 0 Comm: swapper/0 Not tainted 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline] RIP: 0010:acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 d8 fa df 74 48 8b 00 a8 08 75 0c 66 90 0f 00 2d 68 63 b9 00 fb f4 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffffff8de07d70 EFLAGS: 00000246 RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8b23c459 RDX: 0000000000000001 RSI: ffff888143eea000 RDI: ffff888143eea064 RBP: ffff888143eea064 R08: 0000000000000001 R09: ffffed10170c7025 R10: ffff8880b863812b R11: 0000000000000000 R12: ffff88801ef26000 R13: ffffffff8ee125e0 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056081e1f8060 CR3: 000000000df7c000 CR4: 00000000003526f0 Call Trace: acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:702 cpuidle_enter_state+0xaa/0x4f0 drivers/cpuidle/cpuidle.c:264 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:385 cpuidle_idle_call kernel/sched/idle.c:230 [inline] do_idle+0x313/0x3f0 kernel/sched/idle.c:326 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:424 rest_init+0x16b/0x2b0 init/main.c:747 start_kernel+0x3e4/0x4d0 init/main.c:1105 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x148