rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5604/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=270721, q=2365 ncpus=2)
task:syz-executor state:R running task stack:22776 pid:5604 tgid:5604 ppid:5603 task_flags:0x400100 flags:0x00080800
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7228
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7552
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0x48e/0x2550 arch/x86/kernel/unwind_orc.c:520
Code: d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 b4 19 00 00 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 bf 19 00 00 0f b6 43 01 <83> e0 07 0f 84 7c 16 00 00 83 f8 01 4c 8b 6c 24 50 49 bc 00 00 00
RSP: 0018:ffffc900039af6a0 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff90d5494e RCX: ffffffff90546b44
RDX: ffffffff90d5494a RSI: ffffffff90d54914 RDI: ffffffff8c2910c0
RBP: ffffffff824553d5 R08: 000000000000000a R09: 0000000000000000
R10: ffffc900039af798 R11: ffffffff81b10630 R12: dffffc0000000000
R13: ffffffff90d5494f R14: ffffc900039af748 R15: ffffffff90546b44
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:165
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1397 [inline]
__free_frozen_pages+0xc0d/0xd20 mm/page_alloc.c:2938
__slab_free+0x274/0x2c0 mm/slub.c:5672
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4610 [inline]
slab_alloc_node mm/slub.c:4939 [inline]
kmem_cache_alloc_noprof+0x2b8/0x650 mm/slub.c:4946
lsm_file_alloc security/security.c:171 [inline]
security_file_alloc+0x34/0x310 security/security.c:2406
init_file+0x90/0x2b0 fs/file_table.c:184
alloc_empty_file+0x74/0x1d0 fs/file_table.c:266
alloc_file fs/file_table.c:396 [inline]
alloc_file_pseudo+0x115/0x1e0 fs/file_table.c:427
create_pipe_files+0x325/0x7c0 fs/pipe.c:1042
__do_pipe_flags+0x46/0x1f0 fs/pipe.c:1088
do_pipe2+0xaa/0x190 fs/pipe.c:1136
__do_sys_pipe2 fs/pipe.c:1154 [inline]
__se_sys_pipe2 fs/pipe.c:1152 [inline]
__x64_sys_pipe2+0x5a/0x70 fs/pipe.c:1152
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fddcd79be89
RSP: 002b:00007ffda2f8f138 EFLAGS: 00000246 ORIG_RAX: 0000000000000125
RAX: ffffffffffffffda RBX: 0000555579418f40 RCX: 00007fddcd79be89
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffda2f8f148
RBP: 00007ffda2f8f710 R08: 00007fddcd9ede20 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffda2f8f270
R13: 00005555794178f8 R14: 0000555579419218 R15: 00007ffda2f8f290
rcu: rcu_preempt kthread starved for 6655 jiffies! g270721 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:28024 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 22993 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: krds_cp_wq#7/0 rds_connect_worker
RIP: 0010:unwind_next_frame+0x99b/0x2550 arch/x86/kernel/unwind_orc.c:-1
Code: 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 aa 9f ba 00 48 8b 3b 48 85 ff 0f 84 db 0d 00 00 48 83 c7 50 e9 2d 01 00 00 <48> 8b 44 24 38 42 80 3c 20 00 74 0c 48 89 ef e8 81 9f ba 00 49 8d
RSP: 0018:ffffc90000007580 EFLAGS: 00000246
RAX: ffffc9000000765d RBX: 0000000000000003 RCX: ffffffff904af3ac
RDX: ffffffff90c715ea RSI: ffffffff90c715e6 RDI: ffffffff8c2910c0
RBP: ffffc90000007660 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc90000007678 R11: ffffffff81b10630 R12: dffffc0000000000
R13: ffffffff90c715e6 R14: ffffc90000007628 R15: 1ffff92000000ec5
FS: 0000000000000000(0000) GS:ffff88812527c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560c9da31a38 CR3: 000000007d15a000 CR4: 00000000003526f0
Call Trace:
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2700 [inline]
slab_free mm/slub.c:6310 [inline]
kmem_cache_free+0x182/0x650 mm/slub.c:6437
kfree_skb_reason include/linux/skbuff.h:1325 [inline]
kfree_skb include/linux/skbuff.h:1334 [inline]
ip6_mc_input+0x909/0xbc0 net/ipv6/ip6_input.c:638
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
__netif_receive_skb_one_core net/core/dev.c:6206 [inline]
__netif_receive_skb net/core/dev.c:6319 [inline]
process_backlog+0x774/0x1860 net/core/dev.c:6670
__napi_poll+0xaa/0x330 net/core/dev.c:7729
napi_poll net/core/dev.c:7792 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:7949
handle_softirqs+0x225/0x840 kernel/softirq.c:622
do_softirq+0x76/0xd0 kernel/softirq.c:523
__local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
lock_sock include/net/sock.h:1713 [inline]
__inet6_bind+0x301/0xf30 net/ipv6/af_inet6.c:292
kernel_bind+0x13e/0x1c0 net/socket.c:3646
rds_tcp_conn_path_connect+0x53b/0x920 net/rds/tcp_connect.c:175
rds_connect_worker+0x1d8/0x290 net/rds/threads.c:176
process_one_work kernel/workqueue.c:3314 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245