rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6532/1:b..l
rcu: 	(detected by 0, t=10504 jiffies, g=16297, q=36665 ncpus=2)
task:syz.2.145       state:R  running task     stack:21672 pid:6532  tgid:6531  ppid:5826   task_flags:0x400940 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7193
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0xeb2/0x23d0 arch/x86/kernel/unwind_orc.c:-1
Code: 4c 8b 64 24 48 74 08 48 89 df e8 59 24 b4 00 48 8b 44 24 18 48 89 03 ba 10 00 00 00 4c 89 e7 31 f6 e8 22 26 b4 00 48 8b 14 24 <e9> ca 04 00 00 4c 89 64 24 18 4d 8d 6e 08 4c 89 e8 48 c1 e8 03 48
RSP: 0018:ffffc9000e0adf98 EFLAGS: 00000246
RAX: ffffc9000e0ae0b8 RBX: ffffc9000e0ae0a0 RCX: 0000000000000000
RDX: ffffffff90450e00 RSI: 0000000000000000 RDI: ffffc9000e0ae0c8
RBP: dffffc0000000000 R08: ffffc9000e0ae0c7 R09: 0000000000000000
R10: ffffc9000e0ae0b8 R11: fffff52001c15c19 R12: ffffc9000e0ae0b8
R13: 1ffff92001c15c0f R14: ffffc9000e0ae068 R15: ffffc9000e0ae0b0
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 __call_rcu_common kernel/rcu/tree.c:3119 [inline]
 call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3239
 destroy_inode fs/inode.c:401 [inline]
 evict+0x931/0xae0 fs/inode.c:861
 __dentry_kill+0x209/0x660 fs/dcache.c:670
 shrink_kill+0xa9/0x2c0 fs/dcache.c:1137
 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1164
 prune_dcache_sb+0x10e/0x180 fs/dcache.c:1246
 super_cache_scan+0x369/0x4b0 fs/super.c:222
 do_shrink_slab+0x6df/0x10d0 mm/shrinker.c:437
 shrink_slab+0xd74/0x10d0 mm/shrinker.c:664
 shrink_one+0x2d9/0x720 mm/vmscan.c:4921
 shrink_many mm/vmscan.c:4982 [inline]
 lru_gen_shrink_node mm/vmscan.c:5060 [inline]
 shrink_node+0x2f7d/0x35b0 mm/vmscan.c:6047
 shrink_zones mm/vmscan.c:6300 [inline]
 do_try_to_free_pages+0x668/0x1960 mm/vmscan.c:6362
 try_to_free_pages+0x892/0xd90 mm/vmscan.c:6608
 __perform_reclaim mm/page_alloc.c:4377 [inline]
 __alloc_pages_direct_reclaim+0x144/0x300 mm/page_alloc.c:4399
 __alloc_pages_slowpath+0x60c/0xce0 mm/page_alloc.c:4843
 __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:5223
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
 folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2505
 shmem_alloc_folio mm/shmem.c:1902 [inline]
 shmem_alloc_and_add_folio+0x423/0xf40 mm/shmem.c:1944
 shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2568
 shmem_fault+0x179/0x390 mm/shmem.c:2769
 __do_fault+0x138/0x390 mm/memory.c:5320
 do_read_fault mm/memory.c:5755 [inline]
 do_fault mm/memory.c:5889 [inline]
 do_pte_missing+0x2208/0x3330 mm/memory.c:4401
 handle_pte_fault mm/memory.c:6273 [inline]
 __handle_mm_fault mm/memory.c:6411 [inline]
 handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6580
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x1650/0x29f0 mm/gup.c:1428
 populate_vma_page_range+0x29f/0x3a0 mm/gup.c:1860
 __mm_populate+0x24c/0x380 mm/gup.c:1963
 mm_populate include/linux/mm.h:3748 [inline]
 vm_mmap_pgoff+0x387/0x4d0 mm/util.c:586
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e4498f749
RSP: 002b:00007f8e458d1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f8e44be5fa0 RCX: 00007f8e4498f749
RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f8e44a13f91 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8e44be6038 R14: 00007f8e44be5fa0 R15: 00007ffd3cc55438
 </TASK>
rcu: rcu_preempt kthread starved for 10497 jiffies! g16297 f0x2 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:27728 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 __schedule_loop kernel/sched/core.c:6948 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6963
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 33 9e 2a 00 f3 0f 1e fa fb f4 <e9> 48 ee 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6
RAX: df07b82c07aa9900 RBX: ffffffff819786ba RCX: df07b82c07aa9900
RDX: 0000000000000001 RSI: ffffffff8d997e54 RDI: ffffffff8be07960
RBP: ffffc90000197f10 R08: ffff8880b87336db R09: 1ffff110170e66db
R10: dffffc0000000000 R11: ffffed10170e66dc R12: ffffffff8fa22f70
R13: 1ffff11003b56b70 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7f5145066f CR3: 000000007902c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1ea/0x520 kernel/sched/idle.c:332
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x147
 </TASK>
slab_out_of_memory: 258 callbacks suppressed
SLUB: Unable to allocate memory on CPU 1 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
SLUB: Unable to allocate memory on CPU 0 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  node 0: slabs: 466, objs: 14912, free: 0
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  node 1: slabs: 121, objs: 3872, free: 8
  node 0: slabs: 466, objs: 14912, free: 0
SLUB: Unable to allocate memory on CPU 1 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  node 1: slabs: 121, objs: 3872, free: 8
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
SLUB: Unable to allocate memory on CPU 0 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  node 0: slabs: 466, objs: 14912, free: 0
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  node 1: slabs: 121, objs: 3872, free: 8
  node 0: slabs: 466, objs: 14912, free: 0
SLUB: Unable to allocate memory on CPU 1 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  node 1: slabs: 121, objs: 3872, free: 8
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
SLUB: Unable to allocate memory on CPU 0 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  node 0: slabs: 466, objs: 14912, free: 0
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  node 1: slabs: 121, objs: 3872, free: 8
  node 0: slabs: 466, objs: 14912, free: 0
SLUB: Unable to allocate memory on CPU 1 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  node 1: slabs: 121, objs: 3872, free: 8
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
SLUB: Unable to allocate memory on CPU 0 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  node 0: slabs: 466, objs: 14912, free: 0
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  node 1: slabs: 121, objs: 3872, free: 8
  node 0: slabs: 466, objs: 14912, free: 0
SLUB: Unable to allocate memory on CPU 1 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  node 1: slabs: 121, objs: 3872, free: 8
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
SLUB: Unable to allocate memory on CPU 0 (of node 0) on node -1, gfp=0x820(GFP_ATOMIC)
  node 0: slabs: 466, objs: 14912, free: 0
  cache: skbuff_head_cache, object size: 240, buffer size: 320, default order: 0, min order: 0
  node 1: slabs: 121, objs: 3872, free: 8
  node 0: slabs: 2126, objs: 25512, free: 0
  node 1: slabs: 248, objs: 2976, free: 48
slab_out_of_memory: 257 callbacks suppressed
SLUB: Unable to allocate memory on CPU 1 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
SLUB: Unable to allocate memory on CPU 0 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  node 0: slabs: 466, objs: 14912, free: 0
  node 0: slabs: 466, objs: 14912, free: 0
  node 1: slabs: 121, objs: 3872, free: 8
  node 1: slabs: 121, objs: 3872, free: 8
SLUB: Unable to allocate memory on CPU 0 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  node 0: slabs: 466, objs: 14912, free: 0
  node 1: slabs: 121, objs: 3872, free: 8
SLUB: Unable to allocate memory on CPU 1 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
SLUB: Unable to allocate memory on CPU 0 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  node 0: slabs: 466, objs: 14912, free: 0
  node 0: slabs: 466, objs: 14912, free: 0
  node 1: slabs: 121, objs: 3872, free: 8
  node 1: slabs: 121, objs: 3872, free: 8
SLUB: Unable to allocate memory on CPU 1 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
SLUB: Unable to allocate memory on CPU 0 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  node 0: slabs: 466, objs: 14912, free: 0
  node 0: slabs: 466, objs: 14912, free: 0
  node 1: slabs: 121, objs: 3872, free: 8
  node 1: slabs: 121, objs: 3872, free: 8
SLUB: Unable to allocate memory on CPU 0 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
SLUB: Unable to allocate memory on CPU 1 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  node 0: slabs: 466, objs: 14912, free: 0
  node 0: slabs: 466, objs: 14912, free: 0
  node 1: slabs: 121, objs: 3872, free: 8
  node 1: slabs: 121, objs: 3872, free: 8
SLUB: Unable to allocate memory on CPU 0 (of node 0) on node -1, gfp=0x920(GFP_ATOMIC|__GFP_ZERO)
  cache: kmalloc-96, object size: 96, buffer size: 128, default order: 0, min order: 0
  node 0: slabs: 466, objs: 14912, free: 0
  node 1: slabs: 121, objs: 3872, free: 8