GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...0: (1 GPs behind) idle=8fb4/1/0x4000000000000000 softirq=35833/35834 fqs=43 rcu: hardirqs softirqs csw/system rcu: number: 0 0 0 rcu: cputime: 0 0 0 ==> 27950(ms) rcu: (detected by 1, t=10505 jiffies, g=33757, q=379 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 11363 Comm: syz.2.1512 Not tainted 6.13.0-rc2-syzkaller-00362-g2d8308bf5b67 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0xd/0xc0 kernel/rcu/tree.c:737 Code: 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 65 ff 05 3b 4b 84 7e 1e a1 a9 09 48 c7 c3 68 7f 03 00 83 f8 07 89 c5 0f 87 82 00 00 RSP: 0018:ffffc90000007d38 EFLAGS: 00000083 RAX: 0000000000000001 RBX: 1ffff92000000fac RCX: ffffffff8176a9e9 RDX: fffffbfff20be58b RSI: 0000000000000008 RDI: ffffffff905f2c50 RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff20be58a R10: ffffffff905f2c57 R11: 0000000000000003 R12: ffff8880b862ca18 R13: ffff8880b862cc00 R14: ffff8880b862ca00 R15: ffffffff8940e410 FS: 00007f71b1a376c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c342498 CR3: 00000000722ae000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x4e2/0x6f0 kernel/locking/lockdep.c:5860 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x1a/0x80 kernel/locking/spinlock.c:194 __run_hrtimer kernel/time/hrtimer.c:1735 [inline] __hrtimer_run_queues+0x53d/0xae0 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865 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+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:_compound_head include/linux/page-flags.h:244 [inline] RIP: 0010:virt_to_folio include/linux/mm.h:1296 [inline] RIP: 0010:virt_to_slab mm/slab.h:211 [inline] RIP: 0010:kasan_addr_to_slab+0x3a/0x80 mm/kasan/common.c:38 Code: 08 31 c0 5b c3 cc cc cc cc 48 89 df e8 3f 5b 4e ff 48 ba 00 00 00 00 00 ea ff ff 48 c1 e8 0c 48 c1 e0 06 48 01 d0 48 8b 50 08 c2 01 75 2e 66 90 80 78 33 f5 75 ca 5b c3 cc cc cc cc a9 ff 0f RSP: 0018:ffffc900048ff1d8 EFLAGS: 00000282 RAX: ffffea000072c140 RBX: ffff88801cb05e08 RCX: ffffc9000d1cd000 RDX: ffffea000072c101 RSI: ffffffff814adad6 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000002 R12: ffffffff8b1fd1e0 R13: ffff888012171050 R14: ffff88801217140c R15: ffffc900048ff9a0 __kasan_record_aux_stack+0xe/0xd0 mm/kasan/generic.c:529 __call_rcu_common.constprop.0+0x99/0x7a0 kernel/rcu/tree.c:3086 mas_free lib/maple_tree.c:1317 [inline] mas_replace_node lib/maple_tree.c:1754 [inline] mas_wr_node_store+0xddd/0x1610 lib/maple_tree.c:3878 mas_wr_store_entry+0x101c/0x24b0 lib/maple_tree.c:4098 mas_store_prealloc+0x77e/0x1690 lib/maple_tree.c:5519 vma_complete+0x89e/0xda0 mm/vma.c:277 __split_vma+0xcd8/0x1160 mm/vma.c:480 vms_gather_munmap_vmas+0x38b/0x1730 mm/vma.c:1288 __mmap_prepare mm/vma.c:2241 [inline] __mmap_region+0x31d/0x2670 mm/vma.c:2443 mmap_region+0x127/0x320 mm/mmap.c:1348 do_mmap+0xc00/0xfc0 mm/mmap.c:496 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:580 ksys_mmap_pgoff+0x7d/0x5c0 mm/mmap.c:542 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 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: 0033:0x7f71b0b85d19 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:00007f71b1a37038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f71b0d76080 RCX: 00007f71b0b85d19 RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 00007f71b0c01a20 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f71b0d76080 R15: 00007fff8852eb88 rcu: rcu_preempt kthread starved for 1725 jiffies! g33757 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:27600 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99 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: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.13.0-rc2-syzkaller-00362-g2d8308bf5b67 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 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 b8 95 da 74 48 8b 00 a8 08 75 0c 66 90 0f 00 2d 48 3c b4 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:ffffc900001a7d58 EFLAGS: 00000246 RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8b292679 RDX: 0000000000000001 RSI: ffff888144285000 RDI: ffff888144285064 RBP: ffff888144285064 R08: 0000000000000001 R09: ffffed10170e6fed R10: ffff8880b8737f6b R11: 0000000000000000 R12: ffff888148288800 R13: ffffffff8ee16120 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe94faaa48 CR3: 0000000028ddc000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:699 cpuidle_enter_state+0xaa/0x4f0 drivers/cpuidle/cpuidle.c:268 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:389 cpuidle_idle_call kernel/sched/idle.c:230 [inline] do_idle+0x310/0x3f0 kernel/sched/idle.c:325 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423 start_secondary+0x222/0x2b0 arch/x86/kernel/smpboot.c:314 common_startup_64+0x13e/0x148