rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11422/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=53445, q=228 ncpus=2)
task:udevd state:R running task stack:25032 pid:11422 ppid:5142 flags:0x00004002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6700
preempt_schedule_irq+0xbf/0x150 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:mte_parent_slot lib/maple_tree.c:530 [inline]
RIP: 0010:mas_validate_gaps lib/maple_tree.c:7010 [inline]
RIP: 0010:mt_validate+0x2e53/0x4410 lib/maple_tree.c:7234
Code: 83 e6 02 31 ff e8 cd 85 15 f7 4c 89 f0 48 83 e0 02 0f 84 d0 0a 00 00 b9 03 00 00 00 41 81 e6 fc 00 00 00 49 d3 ee 4c 89 34 24 <eb> 17 e8 66 81 15 f7 e9 68 01 00 00 e8 5c 81 15 f7 48 c7 04 24 00
RSP: 0018:ffffc90012df7860 EFLAGS: 00000207
RAX: 0000000000000002 RBX: ffff88807447aa1e RCX: 0000000000000003
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc90012df7a10 R08: ffff88802d518000 R09: 0000000000000003
R10: 0000000000000002 R11: 0000000000000000 R12: 1ffff11004368700
R13: dffffc0000000000 R14: 0000000000000003 R15: ffffffff8be9d441
validate_mm+0xc6/0x450 mm/mmap.c:288
do_vmi_align_munmap+0x14dd/0x16a0 mm/mmap.c:2597
do_vmi_munmap+0x252/0x2d0 mm/mmap.c:2660
__vm_munmap+0x19e/0x3c0 mm/mmap.c:2961
__do_sys_munmap mm/mmap.c:2978 [inline]
__se_sys_munmap mm/mmap.c:2975 [inline]
__x64_sys_munmap+0x60/0x70 mm/mmap.c:2975
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb1a071e097
RSP: 002b:00007fff685aa398 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 000055af743d1e00 RCX: 00007fb1a071e097
RDX: 000055af743d91d8 RSI: 0000000000000200 RDI: 00007fb1a0e29000
RBP: 0000000000000004 R08: 0000000000000030 R09: 000055af743d53d0
R10: 0000000000000000 R11: 0000000000000246 R12: 000055af743ca0b0
R13: 00007fb1a0f5639c R14: 0000000000000800 R15: 0000000000000009
</TASK>
rcu: rcu_preempt kthread starved for 10513 jiffies! g53445 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:27848 pid:17 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 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:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148
Code: dc 23 02 c3 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 43 67 44 00 fb f4 <c3> 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2c 89 cb 80 f9
RSP: 0018:ffffc90000187de0 EFLAGS: 000002c6
RAX: 62e8c39d119a7800 RBX: ffffffff81628c14 RCX: 62e8c39d119a7800
RDX: 0000000000000001 RSI: ffffffff8acacb60 RDI: ffffffff8b1c7be0
RBP: ffffc90000187f20 R08: ffff8880b8f36bab R09: 1ffff110171e6d75
R10: dffffc0000000000 R11: ffffed10171e6d76 R12: 1ffff92000030fc8
R13: dffffc0000000000 R14: 1ffff110036cd780 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d98bf96168 CR3: 000000000cf32000 CR4: 00000000003506e0
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:178 [inline]
do_idle+0x334/0x5c0 kernel/sched/idle.c:302
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:401
start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
secondary_startup_64_no_verify+0x179/0x17b
</TASK>