rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7871/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=27185, q=2130 ncpus=2)
task:syz.3.518       state:R  running task     stack:24136 pid:7871  tgid:7869  ppid:5877   task_flags:0x400140 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:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:67
Code: b4 00 48 ba 00 00 00 00 00 fc ff df e9 88 fc ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 07 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9001961ebb0 EFLAGS: 00000202
RAX: ffffffff8941ce53 RBX: ffffc9001961f920 RCX: 1ffff920032c3d01
RDX: ffffffff90de6032 RSI: 0000000000000002 RDI: ffffc9001961f920
RBP: 1ffff920032c3d92 R08: 0000000000000001 R09: ffffffff8e33f2e0
R10: ffffc9001961ecd8 R11: ffffffff81addd50 R12: ffffc90019620000
R13: 1ffff920032c3d93 R14: ffffc9001961ec88 R15: ffffc90019618000
 deref_stack_reg arch/x86/kernel/unwind_orc.c:422 [inline]
 unwind_next_frame+0xe52/0x23d0 arch/x86/kernel/unwind_orc.c:600
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5267 [inline]
 kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5274
 __kernfs_new_node+0xdc/0x880 fs/kernfs/dir.c:637
 kernfs_new_node+0x102/0x210 fs/kernfs/dir.c:716
 __kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1057
 sysfs_add_file_mode_ns+0x238/0x300 fs/sysfs/file.c:313
 create_files fs/sysfs/group.c:82 [inline]
 internal_create_group+0x667/0x1170 fs/sysfs/group.c:189
 internal_create_groups fs/sysfs/group.c:229 [inline]
 sysfs_create_groups+0x59/0x120 fs/sysfs/group.c:255
 setup_gid_attrs drivers/infiniband/core/sysfs.c:1162 [inline]
 ib_setup_port_attrs+0x140c/0x2070 drivers/infiniband/core/sysfs.c:1439
 add_one_compat_dev+0x449/0x650 drivers/infiniband/core/device.c:1005
 rdma_dev_init_net+0x238/0x2f0 drivers/infiniband/core/device.c:1221
 ops_init+0x35c/0x5c0 net/core/net_namespace.c:137
 setup_net+0x110/0x330 net/core/net_namespace.c:446
 copy_net_ns+0x3e3/0x570 net/core/net_namespace.c:581
 create_new_namespaces+0x3e7/0x6a0 kernel/nsproxy.c:130
 copy_namespaces+0x438/0x4b0 kernel/nsproxy.c:195
 copy_process+0x1689/0x3950 kernel/fork.c:2228
 kernel_clone+0x21e/0x820 kernel/fork.c:2655
 __do_sys_clone kernel/fork.c:2796 [inline]
 __se_sys_clone kernel/fork.c:2780 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2780
 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: 0033:0x7fb4b018f749
RSP: 002b:00007fb4b10c1fe8 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fb4b03e6090 RCX: 00007fb4b018f749
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 498144ee5f62e049
RBP: 00007fb4b0213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fb4b03e6128 R14: 00007fb4b03e6090 R15: 00007ffdf7ec2fa8
 </TASK>