rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7353/1:b..l P17353/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=188361, q=614 ncpus=2)
task:kworker/0:1     state:R  running task     stack:22200 pid:17353 tgid:17353 ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
 irqentry_exit+0x36/0x90 kernel/entry/common.c:197
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__seqprop_spinlock_sequence include/linux/seqlock.h:227 [inline]
RIP: 0010:nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:342 [inline]
RIP: 0010:gc_worker+0x2d5/0x16e0 net/netfilter/nf_conntrack_core.c:1548
Code: 00 00 48 c7 c7 a8 97 ab 90 e8 b7 96 de f7 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 35 61 02 f8 58 48 85 db 0f 85 d4 0f 00 00 <e8> b6 65 02 f8 8b 1d e0 6a f2 06 41 89 dc 31 ff 41 83 e4 01 44 89
RSP: 0018:ffffc90003807b58 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff89b937f9
RDX: ffff888030f94880 RSI: ffffffff89b93808 RDI: 0000000000000007
RBP: ffffffff9b2ba46c R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888024800000
R13: 0000000000040000 R14: dffffc0000000000 R15: 0000000000001770
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c2/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
task:syz.5.7721      state:R  running task     stack:26360 pid:7353  tgid:7350  ppid:29178  task_flags:0x400140 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
 irqentry_exit+0x36/0x90 kernel/entry/common.c:197
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0xdd4/0x20a0 arch/x86/kernel/unwind_orc.c:641
Code: 00 00 00 fc ff df 48 c1 e8 03 0f b6 34 10 49 8d 40 01 48 89 c7 48 c1 ef 03 0f b6 14 17 4c 89 c7 83 e7 07 40 38 fe 40 0f 9e c7 <40> 84 f6 40 0f 95 c6 40 84 f7 0f 85 dc 11 00 00 83 e0 07 38 c2 40
RSP: 0018:ffffc9000ff8f268 EFLAGS: 00000297
RAX: ffffffff914250ef RBX: 0000000000000001 RCX: ffffffff914250ea
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc9000ff8f320 R08: ffffffff914250ee R09: 0000000000000000
R10: 0000000000000004 R11: 00000000000085b3 R12: ffffc9000ff8f328
R13: ffffc9000ff8f2d8 R14: ffffc9000ff8fe28 R15: ffffc9000ff8f30c
 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:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4180 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4236
 __kernfs_new_node+0xd2/0x8e0 fs/kernfs/dir.c:637
 kernfs_new_node+0x13c/0x1e0 fs/kernfs/dir.c:713
 __kernfs_create_file+0x53/0x350 fs/kernfs/file.c:1039
 sysfs_add_file_mode_ns+0x207/0x3c0 fs/sysfs/file.c:319
 create_files fs/sysfs/group.c:76 [inline]
 internal_create_group+0x578/0xf30 fs/sysfs/group.c:183
 internal_create_groups+0x9d/0x150 fs/sysfs/group.c:223
 setup_gid_attrs drivers/infiniband/core/sysfs.c:1162 [inline]
 ib_setup_port_attrs+0x41f/0x600 drivers/infiniband/core/sysfs.c:1439
 add_one_compat_dev+0x558/0x7d0 drivers/infiniband/core/device.c:1005
 rdma_dev_init_net+0x2b1/0x530 drivers/infiniband/core/device.c:1221
 ops_init+0x1e2/0x5f0 net/core/net_namespace.c:136
 setup_net+0x10f/0x380 net/core/net_namespace.c:438
 copy_net_ns+0x2a6/0x5f0 net/core/net_namespace.c:570
 create_new_namespaces+0x3ea/0xa90 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:218
 ksys_unshare+0x45b/0xa40 kernel/fork.c:3124
 __do_sys_unshare kernel/fork.c:3195 [inline]
 __se_sys_unshare kernel/fork.c:3193 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:3193
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f8798eb69
RSP: 002b:00007f5f88889038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f5f87bb6080 RCX: 00007f5f8798eb69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000062040000
RBP: 00007f5f87a11df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5f87bb6080 R15: 00007ffe0c3ca798
 </TASK>