rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (48 ticks this GP) idle=23b/1/0x4000000000000000 softirq=48386/48386 fqs=5249 
	(detected by 1, t=10502 jiffies, g=60185, q=1253)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 17539 Comm: syz.4.3352 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:error_entry+0xaf/0xf0 arch/x86/entry/entry_64.S:1066
Code: 00 00 00 74 2e 89 c8 48 39 84 24 88 00 00 00 74 1a 48 81 bc 24 88 00 00 00 c3 0f e0 89 75 03 0f 01 f8 0f ae e8 48 8d 44 24 08 <c3> 48 89 8c 24 88 00 00 00 0f 01 f8 0f ae e8 66 90 b9 48 00 00 00
RSP: 0018:ffffc90000007910 EFLAGS: 00000087
RAX: ffffc90000007918 RBX: 0000000000000000 RCX: ffffffff89e00f57
RDX: 0000000000000000 RSI: ffffffff89e00e3b RDI: ffffffff8a7a4200
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fe2674d36c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2e31eec5c0 CR3: 000000002386c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 02 20 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900000079c0 EFLAGS: 00000206
RAX: 289c2def7c27db00 RBX: 1ffff92000000f3c RCX: 289c2def7c27db00
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4200
RBP: ffffc90000007aa0 R08: ffffffff901ee1bf R09: 1ffffffff203dc37
R10: dffffc0000000000 R11: fffffbfff203dc38 R12: ffffffff8c323400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 hsr_announce+0x29a/0x310 net/hsr/hsr_device.c:410
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
 expire_timers kernel/time/timer.c:1699 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:security_kernfs_init_security+0x0/0x90 security/security.c:1514
Code: d2 fd eb b6 e8 21 c9 d2 fd b8 a1 ff ff ff eb 09 89 c3 e8 13 c9 d2 fd 89 d8 5b 41 5c 41 5e 41 5f c3 66 0f 1f 84 00 00 00 00 00 <41> 57 41 56 41 55 41 54 53 48 89 f3 49 89 fe 49 bd 00 00 00 00 00
RSP: 0018:ffffc90002fcf258 EFLAGS: 00000282
RAX: ffffffff81ecefba RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90015630000 RSI: ffff888028790bc8 RDI: ffff88802ad621d0
RBP: ffffc90002fcf388 R08: ffff888028790bcf R09: 1ffff110050f2179
R10: dffffc0000000000 R11: ffffed10050f217a R12: dffffc0000000000
R13: ffffffff8b20be80 R14: 0000000000000000 R15: 1ffff920005f9e54
 __kernfs_new_node+0x4a3/0x6b0 fs/kernfs/dir.c:632
 kernfs_new_node+0x148/0x250 fs/kernfs/dir.c:669
 __kernfs_create_file+0x47/0x2e0 fs/kernfs/file.c:985
 sysfs_add_file_mode_ns+0x2d2/0x390 fs/sysfs/file.c:321
 create_files fs/sysfs/group.c:64 [inline]
 internal_create_group+0x492/0xd00 fs/sysfs/group.c:149
 internal_create_groups fs/sysfs/group.c:189 [inline]
 sysfs_create_groups+0x55/0x120 fs/sysfs/group.c:215
 device_add_groups drivers/base/core.c:2491 [inline]
 device_add_attrs+0x82/0x690 drivers/base/core.c:2639
 device_add+0x677/0x1050 drivers/base/core.c:3363
 netdev_register_kobject+0x184/0x320 net/core/net-sysfs.c:2014
 register_netdevice+0x10e8/0x1720 net/core/dev.c:10423
 ipip6_tunnel_create+0x1af/0x660 net/ipv6/sit.c:215
 ipip6_tunnel_locate+0x4c0/0x650 net/ipv6/sit.c:271
 ipip6_tunnel_add net/ipv6/sit.c:1300 [inline]
 ipip6_tunnel_ctl+0x748/0x9c0 net/ipv6/sit.c:1364
 ip_tunnel_siocdevprivate+0x134/0x1e0 net/ipv4/ip_tunnel.c:983
 ipip6_tunnel_siocdevprivate+0x1dd/0x1600 net/ipv6/sit.c:1383
 dev_siocdevprivate net/core/dev_ioctl.c:285 [inline]
 dev_ifsioc+0xa30/0xd50 net/core/dev_ioctl.c:390
 dev_ioctl+0x5df/0xe30 net/core/dev_ioctl.c:597
 sock_ioctl+0x679/0x700 net/socket.c:1192
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fe26927ae99
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:00007fe2674d3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe269502fa0 RCX: 00007fe26927ae99
RDX: 0000200000000080 RSI: 00000000000089f1 RDI: 0000000000000005
RBP: 00007fe269310eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe269503038 R14: 00007fe269502fa0 R15: 00007ffe1dc7a978
 </TASK>