rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P2241/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=468661, q=17 ncpus=2)
task:syz.1.3498 state:R running task stack:27320 pid:2241 tgid:2234 ppid:841 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7277
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7599
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa10 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x5e/0x380 kernel/locking/lockdep.c:5947
Code: 05 cf a7 a5 12 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 de b7 5e 0f 0f 82 c9 02 00 00 8b 35 5e e9 5e 0f 85 f6 0f 85 c7 00 00 00 <48> 8b 44 24 30 65 48 2b 05 6d a7 a5 12 0f 85 09 03 00 00 48 83 c4
RSP: 0018:ffffc900050775f0 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000200
RDX: 0000000000000000 RSI: ffffffff8e369b27 RDI: ffffffff8c623980
RBP: ffffffff8edec2a0 R08: 00000000275a36c2 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
kernfs_root+0x34/0x2a0 fs/kernfs/kernfs-internal.h:76
kernfs_root_is_locked fs/kernfs/kernfs-internal.h:110 [inline]
kernfs_parent fs/kernfs/kernfs-internal.h:134 [inline]
kernfs_add_one+0x237/0xaa0 fs/kernfs/dir.c:826
__kernfs_create_file+0x295/0x350 fs/kernfs/file.c:1079
sysfs_add_file_mode_ns+0x207/0x3c0 fs/sysfs/file.c:316
create_files fs/sysfs/group.c:82 [inline]
internal_create_group+0x593/0xfb0 fs/sysfs/group.c:189
internal_create_groups+0x9d/0x150 fs/sysfs/group.c:229
device_add_groups drivers/base/core.c:2911 [inline]
device_add_attrs drivers/base/core.c:2986 [inline]
device_add+0xf60/0x1970 drivers/base/core.c:3715
netdev_register_kobject+0x1df/0x410 net/core/net-sysfs.c:2340
register_netdevice+0x15b6/0x25a0 net/core/dev.c:11503
__ip_tunnel_create+0x52b/0x670 net/ipv4/ip_tunnel.c:268
ip_tunnel_init_net+0x230/0x780 net/ipv4/ip_tunnel.c:1137
ops_init+0x1e2/0x5f0 net/core/net_namespace.c:137
setup_net+0x118/0x3a0 net/core/net_namespace.c:443
copy_net_ns+0x345/0x7a0 net/core/net_namespace.c:582
create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:132
unshare_nsproxy_namespaces+0xf2/0x220 kernel/nsproxy.c:234
ksys_unshare+0x4a2/0xa70 kernel/fork.c:3295
__do_sys_unshare kernel/fork.c:3359 [inline]
__se_sys_unshare kernel/fork.c:3357 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:3357
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb60f9e159
RSP: 002b:00007fcb61da3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fcb61226270 RCX: 00007fcb60f9e159
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000080
RBP: 00007fcb6103506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcb61226308 R14: 00007fcb61226270 R15: 00007ffe81414558
rcu: rcu_preempt kthread timer wakeup didn't happen for 10536 jiffies! g468661 f0x0 RCU_GP_WAIT_FQS(5) ->state=I
rcu: Possible timer handling issue on cpu=0 timer-softirq=96559
rcu: rcu_preempt kthread starved for 10542 jiffies! g468661 f0x0 RCU_GP_WAIT_FQS(5) ->state=I ->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:I stack:27400 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7277
__schedule_loop kernel/sched/core.c:7354 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7369
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x8f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x17a/0x220 kernel/rcu/tree.c:2330
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 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: 2256 Comm: syz.0.3470 Tainted: G U L syzkaller #0 PREEMPT(full)
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__local_bh_enable_ip+0xaf/0x120 kernel/softirq.c:480
Code: c2 12 65 48 63 05 d9 81 c2 12 a9 00 ff 00 ff 74 4d bf 01 00 00 00 e8 90 2c 0c 00 e8 fb e3 49 00 fb 65 48 83 3d b9 81 c2 12 00 <74> 50 5b 5d c3 cc cc cc cc 65 8b 05 b5 c3 c2 12 85 c0 75 99 90 0f
RSP: 0018:ffffc900050b6ca8 EFLAGS: 00000202
RAX: 0000000013857a9a RBX: fffffffffffffe00 RCX: 0000000000000004
RDX: 0000000000000201 RSI: ffffffff8e38ff43 RDI: ffffffff8c623980
RBP: ffffffff8b71c8f1 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc900050b7040
R13: 0000000000000001 R14: 000000006bb2fab2 R15: dffffc0000000000
FS: 00007f0d341a76c0(0000) GS:ffff888123b5a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0d341a6ff8 CR3: 000000005a6ce000 CR4: 00000000003526f0
Call Trace:
spin_unlock_bh include/linux/spinlock.h:407 [inline]
tipc_skb_peek_port net/tipc/msg.h:1235 [inline]
tipc_sk_rcv+0x2e1/0x1c80 net/tipc/socket.c:2496
tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1708
tipc_node_xmit_skb net/tipc/node.c:1773 [inline]
tipc_node_distr_xmit+0x177/0x3c0 net/tipc/node.c:1788
tipc_sk_rcv+0xaab/0x1c80 net/tipc/socket.c:2506
tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1708
tipc_sk_push_backlog+0x318/0xa00 net/tipc/socket.c:1314
tipc_sk_filter_connect net/tipc/socket.c:2260 [inline]
tipc_sk_filter_rcv+0x95d/0x3250 net/tipc/socket.c:2369
tipc_sk_enqueue net/tipc/socket.c:2450 [inline]
tipc_sk_rcv+0xe90/0x1c80 net/tipc/socket.c:2502
tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1708
tipc_node_xmit_skb net/tipc/node.c:1773 [inline]
tipc_node_distr_xmit+0x177/0x3c0 net/tipc/node.c:1788
tipc_sk_backlog_rcv+0x16f/0x1e0 net/tipc/socket.c:2417
sk_backlog_rcv include/net/sock.h:1190 [inline]
__release_sock+0x3a2/0x440 net/core/sock.c:3270
release_sock+0x1e5/0x280 net/core/sock.c:3869
sockopt_release_sock net/core/sock.c:1163 [inline]
sk_setsockopt+0x46b/0x5d80 net/core/sock.c:1681
do_sock_setsockopt+0x193/0x1d0 net/socket.c:2393
__sys_setsockopt+0x119/0x190 net/socket.c:2422
__do_sys_setsockopt net/socket.c:2428 [inline]
__se_sys_setsockopt net/socket.c:2425 [inline]
__x64_sys_setsockopt+0xbd/0x160 net/socket.c:2425
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0d3339e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0d341a7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f0d33626450 RCX: 00007f0d3339e159
RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007f0d3343506b R08: 0000000000000009 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d336264e8 R14: 00007f0d33626450 R15: 00007ffed5d5bda8