rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6572/1:b..l
	(detected by 1, t=10502 jiffies, g=28649, q=18 ncpus=2)
task:sed             state:R  running task     stack:24352 pid:6572  ppid:6569   flags:0x00004000
Call Trace:
 <TASK>
 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:lock_is_held_type+0xa/0x190 kernel/locking/lockdep.c:5690
Code: fe 6b 8a 48 c7 c6 c0 fe 6b 8a e8 b1 55 3d f7 0f 0b eb bf e8 98 fd ff ff 0f 1f 84 00 00 00 00 00 55 41 57 41 56 41 55 41 54 53 <48> 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 bd ff ff ff
RSP: 0018:ffffc90003497428 EFLAGS: 00000246
RAX: 1ffff1100325ab40 RBX: 0000000000000300 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff8880192d5b58
RBP: ffffc90003497630 R08: ffff88802a6c3b80 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: 00007f7db10f9fff
R13: ffffffff8b90ab01 R14: ffff8880192d5b58 R15: 000000000000000d
 lock_is_held include/linux/lockdep.h:283 [inline]
 mt_locked lib/maple_tree.c:-1 [inline]
 mt_slot lib/maple_tree.c:814 [inline]
 mas_slot lib/maple_tree.c:847 [inline]
 mas_get_slot lib/maple_tree.c:6675 [inline]
 mas_validate_gaps lib/maple_tree.c:6973 [inline]
 mt_validate+0x2d9c/0x4c90 lib/maple_tree.c:7241
 validate_mm_mt+0xcd/0x420 mm/mmap.c:294
 __split_vma+0x30/0x500 mm/mmap.c:2343
 do_mas_align_munmap+0x762/0x1220 mm/mmap.c:2489
 do_mas_munmap+0x240/0x2b0 mm/mmap.c:2638
 __mmap_region mm/mmap.c:2686 [inline]
 mmap_region+0x713/0x1d30 mm/mmap.c:2904
 do_mmap+0x894/0xf30 mm/mmap.c:1424
 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520
 ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1470
 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: 0033:0x7f7db13d1242
RSP: 002b:00007ffc9f8de9d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f7db10ef000 RCX: 00007f7db13d1242
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007f7db10ef000
RBP: 0000000000000812 R08: 0000000000000003 R09: 000000000000d000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffc9f8dea98
R13: 00007f7db13ae580 R14: 00007ffc9f8dee50 R15: 00000fff93f1bd3e
 </TASK>
rcu: rcu_preempt kthread starved for 10537 jiffies! g28649 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:27840 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 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
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 6562 Comm: syz.3.484 Not tainted 6.1.141-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2a/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 ed fa ff ff 66 90 66 90 e8 34 9c 77 f7 e8 af 9a 77 f7 fb 65 48 8b 05 96 d7 f2 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 91 34 5e f7 48
RSP: 0018:ffffc90003407f08 EFLAGS: 00000286
RAX: ffff88802b730000 RBX: 000000000000000f RCX: f8d77a8e14a21100
RDX: dffffc0000000000 RSI: ffffffff8a6bffe0 RDI: ffffffff8abf1360
RBP: ffffc90003407f48 R08: dffffc0000000000 R09: fffffbfff1bfd0b6
R10: fffffbfff1bfd0b6 R11: 1ffffffff1bfd0b5 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90003407f58 R15: 0000000000000000
FS:  000055558a371500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fee493b7bac CR3: 0000000079ca8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:77
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa71e72ab19
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007ffe03257b80 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 000000000004c3b3 RCX: 00007fa71e72ab19
RDX: 00007ffe03257b80 RSI: 00007ffe03257cb0 RDI: 0000000000000011
RBP: 0000000000000032 R08: 000e3e5b5fa690e4 R09: 000000160325842f
R10: 00007ffe03258230 R11: 0000000000000246 R12: 00007fa71e9b624c
R13: 00007ffe03258230 R14: 000000000004c3e5 R15: 00007ffe03258250
 </TASK>