==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xa6/0x120 lib/list_debug.c:62
Read of size 8 at addr ffff888134a1ac70 by task kworker/1:49/532
CPU: 1 PID: 532 Comm: kworker/1:49 Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: mld mld_ifc_work
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:88
dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:427 [inline]
kasan_report+0xf1/0x140 mm/kasan/report.c:444
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
__list_del_entry_valid+0xa6/0x120 lib/list_debug.c:62
__list_del_entry include/linux/list.h:132 [inline]
list_del_init include/linux/list.h:204 [inline]
process_one_work+0x453/0xba0 kernel/workqueue.c:2269
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Allocated by task 534:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:433 [inline]
____kasan_kmalloc mm/kasan/common.c:512 [inline]
__kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521
kasan_kmalloc include/linux/kasan.h:227 [inline]
__kmalloc+0x13d/0x2c0 mm/slub.c:4436
__kmalloc_node include/linux/slab.h:484 [inline]
kmalloc_node include/linux/slab.h:639 [inline]
kvmalloc_node+0x206/0x300 mm/util.c:621
kvmalloc include/linux/mm.h:862 [inline]
kvzalloc include/linux/mm.h:870 [inline]
alloc_netdev_mqs+0x8d/0xc90 net/core/dev.c:10900
alloc_etherdev_mqs+0x34/0x40 net/ethernet/eth.c:383
usbnet_probe+0x219/0x2860 drivers/net/usb/usbnet.c:1726
usb_probe_interface+0x5ff/0xae0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x285/0x970 drivers/base/dd.c:595
__driver_probe_device+0x198/0x280 drivers/base/dd.c:755
driver_probe_device+0x54/0x3e0 drivers/base/dd.c:785
__device_attach_driver+0x2a6/0x460 drivers/base/dd.c:907
bus_for_each_drv+0x175/0x200 drivers/base/bus.c:429
__device_attach+0x2a2/0x400 drivers/base/dd.c:979
device_initial_probe+0x1a/0x20 drivers/base/dd.c:1028
bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:489
device_add+0xb31/0xed0 drivers/base/core.c:3422
usb_set_configuration+0x19c2/0x1f10 drivers/usb/core/message.c:2165
usb_generic_driver_probe+0x91/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x148/0x260 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x285/0x970 drivers/base/dd.c:595
__driver_probe_device+0x198/0x280 drivers/base/dd.c:755
driver_probe_device+0x54/0x3e0 drivers/base/dd.c:785
__device_attach_driver+0x2a6/0x460 drivers/base/dd.c:907
bus_for_each_drv+0x175/0x200 drivers/base/bus.c:429
__device_attach+0x2a2/0x400 drivers/base/dd.c:979
device_initial_probe+0x1a/0x20 drivers/base/dd.c:1028
bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:489
device_add+0xb31/0xed0 drivers/base/core.c:3422
usb_new_device+0xd06/0x1620 drivers/usb/core/hub.c:2638
hub_port_connect drivers/usb/core/hub.c:5555 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5695 [inline]
port_event drivers/usb/core/hub.c:5861 [inline]
hub_event+0x29c4/0x4480 drivers/usb/core/hub.c:5943
process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Freed by task 534:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:193 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
slab_free mm/slub.c:3526 [inline]
kfree+0xc4/0x270 mm/slub.c:4588
kvfree+0x35/0x40 mm/util.c:661
netdev_freemem+0x3f/0x60 net/core/dev.c:10854
netdev_release+0x7f/0xb0 net/core/net-sysfs.c:1903
device_release+0x96/0x1c0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:713 [inline]
kobject_release lib/kobject.c:744 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x18a/0x270 lib/kobject.c:761
put_device+0x1f/0x30 drivers/base/core.c:3530
free_netdev+0x34b/0x450 net/core/dev.c:11040
usbnet_disconnect+0x24b/0x3a0 drivers/net/usb/usbnet.c:1665
usb_unbind_interface+0x212/0x8c0 drivers/usb/core/driver.c:458
__device_release_driver drivers/base/dd.c:1229 [inline]
device_release_driver_internal+0x4c1/0x760 drivers/base/dd.c:1262
device_release_driver+0x19/0x20 drivers/base/dd.c:1285
bus_remove_device+0x2dd/0x340 drivers/base/bus.c:531
device_del+0x696/0xe90 drivers/base/core.c:3610
usb_disable_device+0x3a8/0x750 drivers/usb/core/message.c:1414
usb_disconnect+0x31e/0x850 drivers/usb/core/hub.c:2288
hub_port_connect drivers/usb/core/hub.c:5394 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5695 [inline]
port_event drivers/usb/core/hub.c:5861 [inline]
hub_event+0x1a96/0x4480 drivers/usb/core/hub.c:5943
process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
process_scheduled_works kernel/workqueue.c:2388 [inline]
worker_thread+0xd7b/0x1200 kernel/workqueue.c:2474
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
__kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
insert_work+0x51/0x310 kernel/workqueue.c:1373
__queue_work+0x8e5/0xc60 kernel/workqueue.c:1539
queue_work_on+0xd2/0x140 kernel/workqueue.c:1566
queue_work include/linux/workqueue.h:510 [inline]
schedule_work include/linux/workqueue.h:571 [inline]
usbnet_defer_kevent drivers/net/usb/usbnet.c:482 [inline]
usbnet_link_change+0x189/0x1b0 drivers/net/usb/usbnet.c:-1
usbnet_probe+0x1dfd/0x2860 drivers/net/usb/usbnet.c:1871
usb_probe_interface+0x5ff/0xae0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x285/0x970 drivers/base/dd.c:595
__driver_probe_device+0x198/0x280 drivers/base/dd.c:755
driver_probe_device+0x54/0x3e0 drivers/base/dd.c:785
__device_attach_driver+0x2a6/0x460 drivers/base/dd.c:907
bus_for_each_drv+0x175/0x200 drivers/base/bus.c:429
__device_attach+0x2a2/0x400 drivers/base/dd.c:979
device_initial_probe+0x1a/0x20 drivers/base/dd.c:1028
bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:489
device_add+0xb31/0xed0 drivers/base/core.c:3422
usb_set_configuration+0x19c2/0x1f10 drivers/usb/core/message.c:2165
usb_generic_driver_probe+0x91/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x148/0x260 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x285/0x970 drivers/base/dd.c:595
__driver_probe_device+0x198/0x280 drivers/base/dd.c:755
driver_probe_device+0x54/0x3e0 drivers/base/dd.c:785
__device_attach_driver+0x2a6/0x460 drivers/base/dd.c:907
bus_for_each_drv+0x175/0x200 drivers/base/bus.c:429
__device_attach+0x2a2/0x400 drivers/base/dd.c:979
device_initial_probe+0x1a/0x20 drivers/base/dd.c:1028
bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:489
device_add+0xb31/0xed0 drivers/base/core.c:3422
usb_new_device+0xd06/0x1620 drivers/usb/core/hub.c:2638
hub_port_connect drivers/usb/core/hub.c:5555 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5695 [inline]
port_event drivers/usb/core/hub.c:5861 [inline]
hub_event+0x29c4/0x4480 drivers/usb/core/hub.c:5943
process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Second to last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
__kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
kvfree_call_rcu+0xae/0x7e0 kernel/rcu/tree.c:3648
drop_sysctl_table+0x2ef/0x410 fs/proc/proc_sysctl.c:1687
unregister_sysctl_table+0x7a/0x120 fs/proc/proc_sysctl.c:1725
unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175
ipv4_sysctl_exit_net+0xa8/0xc0 net/ipv4/sysctl_net_ipv4.c:1434
ops_exit_list net/core/net_namespace.c:172 [inline]
cleanup_net+0x58b/0xad0 net/core/net_namespace.c:599
process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
The buggy address belongs to the object at ffff888134a1a000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 3184 bytes inside of
4096-byte region [ffff888134a1a000, ffff888134a1b000)
The buggy address belongs to the page:
page:ffffea0004d28600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888134a18000 pfn:0x134a18
head:ffffea0004d28600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea0006d51008 ffffea00042e8e08 ffff888100043380
raw: ffff888134a18000 0000000000040001 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1365, ts 64588128188, free_ts 63729754459
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
__alloc_pages+0x18f/0x440 mm/page_alloc.c:5808
alloc_slab_page mm/slub.c:-1 [inline]
allocate_slab mm/slub.c:1937 [inline]
new_slab+0xa1/0x4d0 mm/slub.c:2000
___slab_alloc+0x381/0x810 mm/slub.c:3033
__slab_alloc+0x49/0x90 mm/slub.c:3120
slab_alloc_node mm/slub.c:3211 [inline]
slab_alloc mm/slub.c:3255 [inline]
__kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954
kmalloc_reserve net/core/skbuff.c:357 [inline]
__alloc_skb+0x21a/0x740 net/core/skbuff.c:428
alloc_skb include/linux/skbuff.h:1183 [inline]
nlmsg_new include/net/netlink.h:953 [inline]
rtmsg_ifinfo_build_skb+0x7c/0x180 net/core/rtnetlink.c:3884
rtmsg_ifinfo_event net/core/rtnetlink.c:3920 [inline]
rtmsg_ifinfo+0x7a/0x130 net/core/rtnetlink.c:3929
register_netdevice+0x112a/0x13a0 net/core/dev.c:10450
__ip_tunnel_create+0x2bf/0x380 net/ipv4/ip_tunnel.c:267
ip_tunnel_init_net+0x290/0x740 net/ipv4/ip_tunnel.c:1084
erspan_init_net+0x29/0x30 net/ipv4/ip_gre.c:1723
ops_init+0x1ba/0x4a0 net/core/net_namespace.c:138
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1472 [inline]
__free_pages_ok+0x91a/0x9e0 mm/page_alloc.c:1772
free_the_page mm/page_alloc.c:807 [inline]
free_compound_page+0x89/0xa0 mm/page_alloc.c:828
io_mem_free io_uring/io_uring.c:8868 [inline]
io_ring_ctx_free io_uring/io_uring.c:9412 [inline]
io_ring_exit_work+0xed3/0x15e0 io_uring/io_uring.c:9577
process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Memory state around the buggy address:
ffff888134a1ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888134a1ab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888134a1ac00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888134a1ac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888134a1ad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 532 Comm: kworker/1:49 Tainted: G B W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: 0x0 (mld)
RIP: 0010:process_one_work+0xa7/0xba0 kernel/workqueue.c:2223
Code: e8 03 42 80 3c 20 00 74 08 48 89 df e8 72 3c 63 00 48 8b 03 48 89 45 b8 49 8d 45 08 48 89 c1 48 c1 e9 03 48 89 8d 58 ff ff ff <42> 80 3c 21 00 48 89 45 a0 74 0d 48 8b 7d a0 e8 45 3c 63 00 48 8b
RSP: 0018:ffffc90000fa7d20 EFLAGS: 00010002
RAX: 0000000000000008 RBX: ffff88810ed5db48 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000fa7dc8 R08: fffffffffffffffc R09: 0000000000000007
R10: ffffed102694358c R11: 1ffff1102694358c R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88810ed5db00 R15: ffff888134a1ac60
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c736369338 CR3: 000000000660f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Modules linked in:
---[ end trace 99e908ff41e706f5 ]---
RIP: 0010:process_one_work+0xa7/0xba0 kernel/workqueue.c:2223
Code: e8 03 42 80 3c 20 00 74 08 48 89 df e8 72 3c 63 00 48 8b 03 48 89 45 b8 49 8d 45 08 48 89 c1 48 c1 e9 03 48 89 8d 58 ff ff ff <42> 80 3c 21 00 48 89 45 a0 74 0d 48 8b 7d a0 e8 45 3c 63 00 48 8b
RSP: 0018:ffffc90000fa7d20 EFLAGS: 00010002
RAX: 0000000000000008 RBX: ffff88810ed5db48 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000fa7dc8 R08: fffffffffffffffc R09: 0000000000000007
R10: ffffed102694358c R11: 1ffff1102694358c R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88810ed5db00 R15: ffff888134a1ac60
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c736369338 CR3: 000000000660f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
----------------
Code disassembly (best guess):
0: e8 03 42 80 3c call 0x3c804208
5: 20 00 and %al,(%rax)
7: 74 08 je 0x11
9: 48 89 df mov %rbx,%rdi
c: e8 72 3c 63 00 call 0x633c83
11: 48 8b 03 mov (%rbx),%rax
14: 48 89 45 b8 mov %rax,-0x48(%rbp)
18: 49 8d 45 08 lea 0x8(%r13),%rax
1c: 48 89 c1 mov %rax,%rcx
1f: 48 c1 e9 03 shr $0x3,%rcx
23: 48 89 8d 58 ff ff ff mov %rcx,-0xa8(%rbp)
* 2a: 42 80 3c 21 00 cmpb $0x0,(%rcx,%r12,1) <-- trapping instruction
2f: 48 89 45 a0 mov %rax,-0x60(%rbp)
33: 74 0d je 0x42
35: 48 8b 7d a0 mov -0x60(%rbp),%rdi
39: e8 45 3c 63 00 call 0x633c83
3e: 48 rex.W
3f: 8b .byte 0x8b