rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P29052/1:b..l (detected by 0, t=10502 jiffies, g=210645, q=133 ncpus=2) task:modprobe state:R running task stack:24352 pid:29052 ppid:5520 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873 irqentry_exit+0x63/0x70 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:instrument_atomic_read_write include/linux/instrumented.h:102 [inline] RIP: 0010:atomic_inc include/linux/atomic/atomic-instrumented.h:190 [inline] RIP: 0010:mt_validate_nulls lib/maple_tree.c:7193 [inline] RIP: 0010:mt_validate+0x442d/0x4c90 lib/maple_tree.c:7244 Code: 7b f7 4c 0b 64 24 20 0f 84 bb 02 00 00 e8 6b 2b 7b f7 48 c7 c7 40 83 05 97 be 04 00 00 00 e8 aa a8 cc f7 f0 ff 05 03 d7 ff 0c <48> c7 c7 60 83 05 97 be 04 00 00 00 e8 92 a8 cc f7 f0 ff 05 0b d7 RSP: 0018:ffffc900034973c0 EFLAGS: 00000207 RAX: ffffffff8a05ac01 RBX: 0000000000000007 RCX: ffffffff8a05ac36 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff97058340 RBP: ffffc90003497590 R08: 0000000000000004 R09: 0000000000000003 R10: fffffbfff2e0b068 R11: 1ffffffff2e0b068 R12: ffff888073cf3438 R13: ffff888056358280 R14: 0000000000000001 R15: 0000000000000300 validate_mm_mt+0xcd/0x420 mm/mmap.c:294 validate_mm+0xcc/0x2b0 mm/mmap.c:331 do_mas_align_munmap+0xfad/0x1220 mm/mmap.c:2595 do_mas_munmap+0x240/0x2b0 mm/mmap.c:2646 __mmap_region mm/mmap.c:2694 [inline] mmap_region+0x713/0x1d30 mm/mmap.c:2912 do_mmap+0x894/0xf30 mm/mmap.c:1432 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520 ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1478 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe19e2b8242 RSP: 002b:00007fff1ab893e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fe19e01a000 RCX: 00007fe19e2b8242 RDX: 0000000000000005 RSI: 000000000014e000 RDI: 00007fe19e01a000 RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000028000 R10: 0000000000000812 R11: 0000000000000206 R12: 00007fff1ab89438 R13: 00007fe19e2945f0 R14: 00007fff1ab89c20 R15: 00000fffe3571280 rcu: rcu_preempt kthread starved for 6386 jiffies! g210645 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:27840 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.1.144-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:742 Code: 48 89 df e8 a7 89 b0 f7 e9 4c ff ff ff e8 5d 07 f6 ff 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 66 90 0f 00 2d 67 d5 64 00 fb f4 0f 1f 40 00 41 57 41 56 53 49 be 00 00 00 00 00 fc ff df 65 48 RSP: 0018:ffffffff8c807d88 EFLAGS: 000002c6 RAX: 9672272b937ce800 RBX: ffffffff8a21ce87 RCX: 9672272b937ce800 RDX: 0000000000000001 RSI: ffffffff8a8c0460 RDI: ffffffff8adf1c20 RBP: ffffffff8c807ec0 R08: dffffc0000000000 R09: ffffed10171c6af6 R10: ffffed10171c6af6 R11: 1ffff110171c6af5 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff8c8bc680 R15: 1ffffffff1c3ed06 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1573fffd58 CR3: 0000000073547000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: default_idle_call+0x84/0xc0 kernel/sched/idle.c:109 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x1fc/0x570 kernel/sched/idle.c:303 cpu_startup_entry+0x3f/0x60 kernel/sched/idle.c:401 rest_init+0x2dc/0x300 init/main.c:733 arch_call_rest_init+0xa/0xa init/main.c:893 start_kernel+0x490/0x539 init/main.c:1140 secondary_startup_64_no_verify+0xcf/0xdb