rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P14516/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=72333, q=529 ncpus=2)
task:udevd           state:R  running task     stack:25544 pid:14516 ppid:5161   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x14e2/0x4580 kernel/sched/core.c:6700
 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7010
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_is_held_type+0x5/0x190 kernel/locking/lockdep.c:5810
Code: dc 03 00 75 d6 48 c7 c7 e0 b7 aa 8a 48 c7 c6 20 b8 aa 8a e8 5d 70 e1 f6 0f 0b eb bf e8 84 fc ff ff 0f 1f 40 00 f3 0f 1e fa 55 <41> 57 41 56 41 55 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00
RSP: 0018:ffffc900050f76b0 EFLAGS: 00000293
RAX: ffffffff8a5c5c0c RBX: ffff88802f426f00 RCX: ffff88802ba58000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff888031f481a0
RBP: ffffc900050f7890 R08: ffff88802ba58000 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88802f426a00
R13: ffff88802e778e80 R14: ffff888031f481a0 R15: 0000000000000300
 lock_is_held include/linux/lockdep.h:288 [inline]
 mt_locked lib/maple_tree.c:-1 [inline]
 mt_slot lib/maple_tree.c:812 [inline]
 mas_slot lib/maple_tree.c:845 [inline]
 mt_validate_nulls lib/maple_tree.c:7177 [inline]
 mt_validate+0x3f4b/0x4530 lib/maple_tree.c:7231
 validate_mm+0xb1/0x420 mm/mmap.c:287
 __split_vma+0xa93/0xc00 mm/mmap.c:2421
 do_vmi_align_munmap+0x377/0x1660 mm/mmap.c:2510
 do_vmi_munmap+0x252/0x2d0 mm/mmap.c:2656
 __vm_munmap+0x193/0x3c0 mm/mmap.c:2957
 __do_sys_munmap mm/mmap.c:2974 [inline]
 __se_sys_munmap mm/mmap.c:2971 [inline]
 __x64_sys_munmap+0x60/0x70 mm/mmap.c:2971
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f84ecb1e097
RSP: 002b:00007ffe56bb4728 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 000055baacd7bfa0 RCX: 00007f84ecb1e097
RDX: 000055baacd6e878 RSI: 0000000000000200 RDI: 00007f84ed152000
RBP: 000055baacd700d0 R08: 000055baacd83500 R09: 0000000000000003
R10: 000055baacd700c0 R11: 0000000000000246 R12: 00007f84ed2907c0
R13: 00007f84ed29239c R14: 0000000000000022 R15: 0000000000000001
 </TASK>
rcu: rcu_preempt kthread starved for 10537 jiffies! g72333 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:27496 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x14e2/0x4580 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.6.97-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:148
Code: cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d 33 a6 39 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 66 0f 1f 00 55 41 57 41 56
RSP: 0018:ffffffff8ca07d80 EFLAGS: 000002c2
RAX: d763c48a1cba3f00 RBX: ffffffff81618a7b RCX: d763c48a1cba3f00
RDX: 0000000000000001 RSI: ffffffff8aaab940 RDI: ffffffff8afc7880
RBP: ffffffff8ca07eb8 R08: ffff8880b8e36d4b R09: 1ffff110171c6da9
R10: dffffc0000000000 R11: ffffed10171c6daa R12: ffffffff8e4a92e8
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1952670
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ca1eff8 CR3: 000000005eb28000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:753
 default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
 cpuidle_idle_call kernel/sched/idle.c:170 [inline]
 do_idle+0x1eb/0x510 kernel/sched/idle.c:282
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:380
 rest_init+0x2e2/0x300 init/main.c:732
 arch_call_rest_init+0xe/0x10 init/main.c:829
 start_kernel+0x459/0x4e0 init/main.c:1074
 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
 x86_64_start_kernel+0x60/0x60 arch/x86/kernel/head64.c:536
 secondary_startup_64_no_verify+0x179/0x17b
 </TASK>