rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6749/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=23773, q=265 ncpus=2)
task:kworker/u8:22 state:R running task stack:24872 pid:6749 tgid:6749 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: krdsd rds_connect_worker
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x62/0x330 kernel/locking/lockdep.c:5872
Code: 8f 12 12 83 f8 07 0f 87 a2 02 00 00 89 c0 48 0f a3 05 e2 ac ed 0e 0f 82 74 02 00 00 8b 35 5a dd ed 0e 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 f9 8e 12 12 0f 85 ad 02 00 00 48 83 c4
RSP: 0018:ffffc9000bed7438 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e3c92c0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8da973d4 RDI: ffffffff8bf21180
RBP: 0000000000000002 R08: 0000000076a38fda R09: 00000000d8686abd
R10: ffff88802de60b30 R11: 00000000dd8686ab R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
__kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6663 [inline]
kfree+0x2f8/0x6e0 mm/slub.c:6871
netlbl_secattr_destroy include/net/netlabel.h:367 [inline]
netlbl_secattr_free include/net/netlabel.h:399 [inline]
selinux_netlbl_sk_security_free+0x24d/0x3e0 security/selinux/netlabel.c:162
security_sk_free+0xd7/0x1a0 security/security.c:4409
sk_prot_free net/core/sock.c:2277 [inline]
__sk_destruct+0x4c6/0x910 net/core/sock.c:2384
sk_destruct+0xc2/0xf0 net/core/sock.c:2412
__sk_free+0xf4/0x3e0 net/core/sock.c:2423
sk_free+0x6a/0x90 net/core/sock.c:2434
sock_put include/net/sock.h:1998 [inline]
tcp_close+0xd3/0x120 net/ipv4/tcp.c:3303
inet_release+0xed/0x200 net/ipv4/af_inet.c:437
__sock_release net/socket.c:653 [inline]
sock_release+0x91/0x1d0 net/socket.c:681
rds_tcp_conn_path_connect+0x4aa/0x7f0 net/rds/tcp_connect.c:191
rds_connect_worker+0x1af/0x2c0 net/rds/threads.c:176
process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: rcu_preempt kthread starved for 10543 jiffies! g23773 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:27696 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8767 Comm: syz.2.912 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:iterate_chain_key kernel/locking/lockdep.c:453 [inline]
RIP: 0010:__lock_acquire+0x71d/0x22f0 kernel/locking/lockdep.c:5225
Code: c2 08 31 ca 89 d1 29 d0 44 01 c2 c1 c1 10 89 d6 31 c8 89 c1 41 29 c0 01 d0 c1 c9 0d 44 31 c1 41 89 cd 29 ce 01 c8 41 c1 c5 04 <89> c0 41 31 f5 49 c1 e5 20 49 09 c5 8b 43 20 25 00 80 04 00 3d 00
RSP: 0018:ffffc90000007898 EFLAGS: 00000006
RAX: 0000000002c60add RBX: ffff88807baf0ba8 RCX: 00000000611b5620
RDX: 0000000089419b2a RSI: 000000002826450a RDI: ffff88807baf0000
RBP: ffff88807baf0000 R08: 00000000ad839568 R09: 00000000f523f561
R10: ffff88807baf0b30 R11: 000000001f523f56 R12: 0000000000000003
R13: 0000000011b56206 R14: 0000000000000000 R15: 0000000000000001
FS: 00007fa30c9906c0(0000) GS:ffff888124960000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556a446808 CR3: 000000004a105000 CR4: 00000000003526f0
Call Trace:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
unpoison_slab_object mm/kasan/common.c:342 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:368
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4948 [inline]
slab_alloc_node mm/slub.c:5258 [inline]
kmem_cache_alloc_noprof+0x250/0x760 mm/slub.c:5265
sigqueue_alloc kernel/signal.c:455 [inline]
__send_signal_locked+0x159/0x12c0 kernel/signal.c:1087
do_send_sig_info kernel/signal.c:1269 [inline]
group_send_sig_info+0x2a4/0x300 kernel/signal.c:1419
do_bpf_send_signal+0xe1/0x1f0 kernel/trace/bpf_trace.c:813
irq_work_single+0x1bf/0x260 kernel/irq_work.c:221
irq_work_run_list+0x92/0xc0 kernel/irq_work.c:252
irq_work_run+0x58/0xd0 kernel/irq_work.c:261
__sysvec_irq_work+0x87/0x3b0 arch/x86/kernel/irq_work.c:22
instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
sysvec_irq_work+0x9f/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:733
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_apic_msr_write arch/x86/include/asm/apic.h:212 [inline]
RIP: 0010:native_apic_msr_write+0x28/0x40 arch/x86/include/asm/apic.h:206
Code: 90 90 f3 0f 1e fa 8d 87 30 ff ff ff 83 e0 ef 74 20 89 f8 83 e0 ef 83 f8 20 74 16 c1 ef 04 31 d2 89 f0 8d 8f 00 08 00 00 0f 30 <66> 90 e9 51 a2 fe 09 e9 4c a2 fe 09 89 f6 31 d2 89 cf e9 a1 48 71
RSP: 0018:ffffc9001ee0f7f8 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: 0000000000000001 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000003f
RBP: ffff8880b8431560 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 00000000f288bcf5 R12: 1ffff92003dc1f04
R13: 1ffff11017086201 R14: 0000000000000000 R15: 0000000000000000
__apic_send_IPI_self arch/x86/include/asm/apic.h:459 [inline]
arch_irq_work_raise+0x4f/0x70 arch/x86/kernel/irq_work.c:31
irq_work_raise kernel/irq_work.c:84 [inline]
__irq_work_queue_local+0x1d2/0x550 kernel/irq_work.c:112
irq_work_queue kernel/irq_work.c:124 [inline]
irq_work_queue+0xab/0x100 kernel/irq_work.c:116
bpf_send_signal_common+0x3a4/0x540 kernel/trace/bpf_trace.c:871
____bpf_send_signal kernel/trace/bpf_trace.c:880 [inline]
bpf_send_signal+0x1d/0x30 kernel/trace/bpf_trace.c:878
bpf_prog_0569e9d1ebdddc39+0x23/0x2e
bpf_dispatcher_nop_func include/linux/bpf.h:1376 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
bpf_trace_run3+0x248/0x5d0 kernel/trace/bpf_trace.c:2117
__bpf_trace_mmap_lock_acquire_returned+0xfc/0x140 include/trace/events/mmap_lock.h:47
__traceiter_mmap_lock_acquire_returned+0x7c/0xc0 include/trace/events/mmap_lock.h:47
__do_trace_mmap_lock_acquire_returned include/trace/events/mmap_lock.h:47 [inline]
trace_mmap_lock_acquire_returned+0x134/0x1c0 include/trace/events/mmap_lock.h:47
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:42 [inline]
mmap_write_lock_killable include/linux/mmap_lock.h:333 [inline]
do_mremap+0xf79/0x2020 mm/mremap.c:1924
__do_sys_mremap+0x119/0x170 mm/mremap.c:1993
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa30bb8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa30c990038 EFLAGS: 00000246 ORIG_RAX: 0000000000000019
RAX: ffffffffffffffda RBX: 00007fa30bde6180 RCX: 00007fa30bb8f749
RDX: 0000000000002000 RSI: 0000000000002000 RDI: 0000200000ffc000
RBP: 00007fa30bc13f91 R08: 0000200000fff000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa30bde6218 R14: 00007fa30bde6180 R15: 00007fff8e0211c8