From: syzbot <syzbot+8aa80c6232008f7b957d@syzkaller.appspotmail.com>
To: edumazet@google.com, hdanton@sina.com, kuniyu@google.com,
leitao@debian.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [net?] BUG: unable to handle kernel paging request in nsim_queue_free
Date: Tue, 12 Aug 2025 18:17:05 -0700 [thread overview]
Message-ID: <689be791.050a0220.51d73.00b9.GAE@google.com> (raw)
In-Reply-To: <20250813005602.4330-1-hdanton@sina.com>
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in udp_tunnel_nic_device_sync_work
netdevsim netdevsim3 eth3: set [1, 0] type 2 family 0 port 6081 - 0
==================================================================
BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:577 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock+0x147/0x1360 kernel/locking/mutex.c:760
Read of size 8 at addr ffff8880434426b0 by task kworker/u4:10/1096
CPU: 0 UID: 0 PID: 1096 Comm: kworker/u4:10 Not tainted 6.17.0-rc1-syzkaller-00016-g8742b2d8935f-dirty #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: udp_tunnel_nic udp_tunnel_nic_device_sync_work
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
__mutex_lock_common kernel/locking/mutex.c:577 [inline]
__mutex_lock+0x147/0x1360 kernel/locking/mutex.c:760
udp_tunnel_nic_device_sync_work+0x39/0xa50 net/ipv4/udp_tunnel_nic.c:737
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 6208:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4365 [inline]
__kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4377
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
udp_tunnel_nic_alloc net/ipv4/udp_tunnel_nic.c:756 [inline]
udp_tunnel_nic_register net/ipv4/udp_tunnel_nic.c:833 [inline]
udp_tunnel_nic_netdevice_event+0x854/0x19f0 net/ipv4/udp_tunnel_nic.c:931
notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers net/core/dev.c:2281 [inline]
register_netdevice+0x1608/0x1ae0 net/core/dev.c:11227
nsim_init_netdevsim drivers/net/netdevsim/netdev.c:1034 [inline]
nsim_create+0xae8/0xf10 drivers/net/netdevsim/netdev.c:1105
__nsim_dev_port_add+0x6b6/0xb10 drivers/net/netdevsim/dev.c:1438
nsim_dev_port_add_all+0x37/0xf0 drivers/net/netdevsim/dev.c:1494
nsim_dev_reload_create drivers/net/netdevsim/dev.c:1546 [inline]
nsim_dev_reload_up+0x451/0x780 drivers/net/netdevsim/dev.c:1003
devlink_reload+0x4e9/0x8d0 net/devlink/dev.c:474
devlink_nl_reload_doit+0xb35/0xd50 net/devlink/dev.c:584
genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:729
____sys_sendmsg+0x505/0x830 net/socket.c:2614
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
__sys_sendmsg net/socket.c:2700 [inline]
__do_sys_sendmsg net/socket.c:2705 [inline]
__se_sys_sendmsg net/socket.c:2703 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 6227:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:243 [inline]
__kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2417 [inline]
slab_free mm/slub.c:4680 [inline]
kfree+0x18e/0x440 mm/slub.c:4879
udp_tunnel_nic_free net/ipv4/udp_tunnel_nic.c:785 [inline]
udp_tunnel_nic_unregister net/ipv4/udp_tunnel_nic.c:910 [inline]
udp_tunnel_nic_netdevice_event+0x1332/0x19f0 net/ipv4/udp_tunnel_nic.c:942
notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers net/core/dev.c:2281 [inline]
unregister_netdevice_many_notify+0x14d7/0x1ff0 net/core/dev.c:12148
unregister_netdevice_many net/core/dev.c:12211 [inline]
unregister_netdevice_queue+0x33c/0x380 net/core/dev.c:12055
unregister_netdevice include/linux/netdevice.h:3382 [inline]
nsim_destroy+0x1dd/0x670 drivers/net/netdevsim/netdev.c:1140
__nsim_dev_port_del+0x14d/0x1b0 drivers/net/netdevsim/dev.c:1473
nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1485 [inline]
nsim_dev_reload_destroy+0x288/0x490 drivers/net/netdevsim/dev.c:1707
nsim_dev_reload_down+0x8a/0xc0 drivers/net/netdevsim/dev.c:983
devlink_reload+0x1b3/0x8d0 net/devlink/dev.c:461
devlink_nl_reload_doit+0xb35/0xd50 net/devlink/dev.c:584
genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:729
____sys_sendmsg+0x505/0x830 net/socket.c:2614
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
__sys_sendmsg net/socket.c:2700 [inline]
__do_sys_sendmsg net/socket.c:2705 [inline]
__se_sys_sendmsg net/socket.c:2703 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
insert_work+0x3d/0x330 kernel/workqueue.c:2184
__queue_work+0xbaf/0xfb0 kernel/workqueue.c:2343
queue_work_on+0x181/0x270 kernel/workqueue.c:2390
queue_work include/linux/workqueue.h:669 [inline]
udp_tunnel_nic_device_sync net/ipv4/udp_tunnel_nic.c:307 [inline]
__udp_tunnel_nic_add_port+0xb71/0xd60 net/ipv4/udp_tunnel_nic.c:523
udp_tunnel_nic_add_port include/net/udp_tunnel.h:371 [inline]
udp_tunnel_push_rx_port+0x180/0x200 net/ipv4/udp_tunnel_core.c:111
geneve_offload_rx_ports+0xd7/0x160 drivers/net/geneve.c:1188
geneve_netdevice_event+0x6a/0x80 drivers/net/geneve.c:-1
notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers+0x88/0xc0 net/core/dev.c:2281
udp_tunnel_get_rx_info include/net/udp_tunnel.h:438 [inline]
udp_tunnel_nic_register net/ipv4/udp_tunnel_nic.c:855 [inline]
udp_tunnel_nic_netdevice_event+0x134d/0x19f0 net/ipv4/udp_tunnel_nic.c:931
notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers net/core/dev.c:2281 [inline]
register_netdevice+0x1608/0x1ae0 net/core/dev.c:11227
nsim_init_netdevsim drivers/net/netdevsim/netdev.c:1034 [inline]
nsim_create+0xae8/0xf10 drivers/net/netdevsim/netdev.c:1105
__nsim_dev_port_add+0x6b6/0xb10 drivers/net/netdevsim/dev.c:1438
nsim_dev_port_add_all+0x37/0xf0 drivers/net/netdevsim/dev.c:1494
nsim_dev_reload_create drivers/net/netdevsim/dev.c:1546 [inline]
nsim_dev_reload_up+0x451/0x780 drivers/net/netdevsim/dev.c:1003
devlink_reload+0x4e9/0x8d0 net/devlink/dev.c:474
devlink_nl_reload_doit+0xb35/0xd50 net/devlink/dev.c:584
genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:729
____sys_sendmsg+0x505/0x830 net/socket.c:2614
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
__sys_sendmsg net/socket.c:2700 [inline]
__do_sys_sendmsg net/socket.c:2705 [inline]
__se_sys_sendmsg net/socket.c:2703 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
insert_work+0x3d/0x330 kernel/workqueue.c:2184
__queue_work+0xcd2/0xfb0 kernel/workqueue.c:2339
queue_work_on+0x181/0x270 kernel/workqueue.c:2390
queue_work include/linux/workqueue.h:669 [inline]
udp_tunnel_nic_device_sync net/ipv4/udp_tunnel_nic.c:307 [inline]
__udp_tunnel_nic_add_port+0xb71/0xd60 net/ipv4/udp_tunnel_nic.c:523
udp_tunnel_nic_add_port include/net/udp_tunnel.h:371 [inline]
udp_tunnel_push_rx_port+0x180/0x200 net/ipv4/udp_tunnel_core.c:111
geneve_offload_rx_ports+0xd7/0x160 drivers/net/geneve.c:1188
geneve_netdevice_event+0x6a/0x80 drivers/net/geneve.c:-1
notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers+0x88/0xc0 net/core/dev.c:2281
udp_tunnel_get_rx_info include/net/udp_tunnel.h:438 [inline]
udp_tunnel_nic_register net/ipv4/udp_tunnel_nic.c:855 [inline]
udp_tunnel_nic_netdevice_event+0x134d/0x19f0 net/ipv4/udp_tunnel_nic.c:931
notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers net/core/dev.c:2281 [inline]
register_netdevice+0x1608/0x1ae0 net/core/dev.c:11227
nsim_init_netdevsim drivers/net/netdevsim/netdev.c:1034 [inline]
nsim_create+0xae8/0xf10 drivers/net/netdevsim/netdev.c:1105
__nsim_dev_port_add+0x6b6/0xb10 drivers/net/netdevsim/dev.c:1438
nsim_dev_port_add_all+0x37/0xf0 drivers/net/netdevsim/dev.c:1494
nsim_dev_reload_create drivers/net/netdevsim/dev.c:1546 [inline]
nsim_dev_reload_up+0x451/0x780 drivers/net/netdevsim/dev.c:1003
devlink_reload+0x4e9/0x8d0 net/devlink/dev.c:474
devlink_nl_reload_doit+0xb35/0xd50 net/devlink/dev.c:584
genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:729
____sys_sendmsg+0x505/0x830 net/socket.c:2614
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
__sys_sendmsg net/socket.c:2700 [inline]
__do_sys_sendmsg net/socket.c:2705 [inline]
__se_sys_sendmsg net/socket.c:2703 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888043442600
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 176 bytes inside of
freed 256-byte region [ffff888043442600, ffff888043442700)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x43442
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000000 ffff88801a441b40 ffffea00010d2d40 dead000000000006
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5772, tgid 5772 (syz-executor), ts 159705044362, free_ts 159704611959
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2487 [inline]
allocate_slab+0x8a/0x370 mm/slub.c:2655
new_slab mm/slub.c:2709 [inline]
___slab_alloc+0xbeb/0x1410 mm/slub.c:3891
__slab_alloc mm/slub.c:3981 [inline]
__slab_alloc_node mm/slub.c:4056 [inline]
slab_alloc_node mm/slub.c:4217 [inline]
__do_kmalloc_node mm/slub.c:4364 [inline]
__kmalloc_noprof+0x305/0x4f0 mm/slub.c:4377
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
fib_create_info+0x1728/0x3210 net/ipv4/fib_semantics.c:1402
fib_table_insert+0xc6/0x1b50 net/ipv4/fib_trie.c:1212
fib_magic+0x2c4/0x390 net/ipv4/fib_frontend.c:1133
fib_add_ifaddr+0x38d/0x5f0 net/ipv4/fib_frontend.c:1170
fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1515
notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers net/core/dev.c:2281 [inline]
__dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
netif_change_flags+0xe8/0x1a0 net/core/dev.c:9600
do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3143
page last free pid 5772 tgid 5772 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895
pagetable_free include/linux/mm.h:2898 [inline]
pagetable_dtor_free+0x2d2/0x3b0 include/linux/mm.h:2996
mm_free_pgd kernel/fork.c:541 [inline]
__mmdrop+0xb5/0x580 kernel/fork.c:683
mmdrop include/linux/sched/mm.h:55 [inline]
mmdrop_sched include/linux/sched/mm.h:83 [inline]
mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline]
finish_task_switch+0x3ee/0x950 kernel/sched/core.c:5250
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x17a0/0x4cc0 kernel/sched/core.c:6961
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7145
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7169
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
vprintk_emit+0x69a/0x7a0 kernel/printk/printk.c:2451
_printk+0xcf/0x120 kernel/printk/printk.c:2475
netdev_warn+0x10a/0x160 net/core/dev.c:12633
hsr_dev_open+0x19d/0x260 net/hsr/hsr_device.c:159
__dev_open+0x46d/0x880 net/core/dev.c:1682
__dev_change_flags+0x1ea/0x6d0 net/core/dev.c:9532
netif_change_flags+0x88/0x1a0 net/core/dev.c:9595
do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3143
Memory state around the buggy address:
ffff888043442580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888043442600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888043442680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888043442700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888043442780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Tested on:
commit: 8742b2d8 Merge tag 'pull-fixes' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11ffc5a2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d67d3af29f50297e
dashboard link: https://syzkaller.appspot.com/bug?extid=8aa80c6232008f7b957d
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
patch: https://syzkaller.appspot.com/x/patch.diff?x=1185caf0580000
next prev parent reply other threads:[~2025-08-13 1:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-31 18:45 [syzbot] [net?] BUG: unable to handle kernel paging request in nsim_queue_free syzbot
2025-08-12 9:58 ` syzbot
2025-08-12 11:35 ` Hillf Danton
2025-08-12 11:58 ` syzbot
2025-08-12 13:31 ` Hillf Danton
2025-08-12 13:53 ` syzbot
2025-08-12 14:56 ` Hillf Danton
2025-08-12 15:16 ` syzbot
2025-08-12 15:33 ` Breno Leitao
2025-08-13 0:56 ` Hillf Danton
2025-08-13 1:17 ` syzbot [this message]
2025-08-13 5:45 ` Kuniyuki Iwashima
2025-08-13 1:10 ` Hillf Danton
2025-08-13 1:38 ` syzbot
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