[v6.6] KASAN: slab-use-after-free Read in ep_open
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syzbot
Aug 1, 2026, 8:04:24 AM (2 days ago) Aug 1
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: a1153c0deb44 Linux 6.6.147
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=17d6cdb9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f0bc3d90c30838b5
dashboard link: https://syzkaller.appspot.com/bug?extid=6e21a0f7fbd3594567a3
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9f646bfa1b52/disk-a1153c0d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a2aec2e8f0fd/vmlinux-a1153c0d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a7abe1f87405/bzImage-a1153c0d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e21a0...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:582 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock+0xfc/0xc80 kernel/locking/mutex.c:747
Read of size 8 at addr ffff88805bbe6460 by task syz-executor/12192
CPU: 0 PID: 12192 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
__mutex_lock_common kernel/locking/mutex.c:582 [inline]
__mutex_lock+0xfc/0xc80 kernel/locking/mutex.c:747
ep_open+0x4e/0x270 drivers/usb/gadget/legacy/inode.c:819
do_dentry_open+0x880/0x14b0 fs/open.c:929
do_open fs/namei.c:3640 [inline]
path_openat+0x284f/0x3270 fs/namei.c:3801
do_filp_open+0x1f2/0x430 fs/namei.c:3828
do_sys_openat2+0x134/0x1d0 fs/open.c:1422
do_sys_open fs/open.c:1437 [inline]
__do_sys_openat fs/open.c:1453 [inline]
__se_sys_openat fs/open.c:1448 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1448
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efd1c95e84e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffe18bf0098 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055556b058500 RCX: 00007efd1c95e84e
RDX: 0000000000000000 RSI: 00007ffe18bf0200 RDI: ffffffffffffff9c
RBP: 00007ffe18bf0200 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe18bf12f0
R13: 00007efd1ca3445c R14: 000055556b0584e8 R15: 0000000000000006
</TASK>
Allocated by task 19019:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
activate_ep_files drivers/usb/gadget/legacy/inode.c:1596 [inline]
gadgetfs_bind+0x25f/0x830 drivers/usb/gadget/legacy/inode.c:1687
gadget_bind_driver+0x2b3/0x770 drivers/usb/gadget/udc/core.c:1651
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x247/0xae0 drivers/base/dd.c:717
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879
driver_probe_device+0x4f/0x420 drivers/base/dd.c:909
__driver_attach+0x444/0x6d0 drivers/base/dd.c:1295
bus_for_each_dev+0x235/0x2b0 drivers/base/bus.c:370
bus_add_driver+0x340/0x630 drivers/base/bus.c:723
driver_register+0x23a/0x310 drivers/base/driver.c:246
usb_gadget_register_driver_owner+0xf9/0x270 drivers/usb/gadget/udc/core.c:1730
dev_config+0xe49/0x1260 drivers/usb/gadget/legacy/inode.c:1878
vfs_write+0x299/0x9a0 fs/read_write.c:582
ksys_write+0x151/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 172:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
__kmem_cache_free+0xba/0x1f0 mm/slub.c:3843
destroy_ep_files+0x280/0x340 drivers/usb/gadget/legacy/inode.c:1571
gadgetfs_unbind+0x109/0x2b0 drivers/usb/gadget/legacy/inode.c:1650
gadget_unbind_driver+0x1bf/0x3e0 drivers/usb/gadget/udc/core.c:1702
device_remove drivers/base/dd.c:626 [inline]
__device_release_driver drivers/base/dd.c:1351 [inline]
device_release_driver_internal+0x408/0x6f0 drivers/base/dd.c:1374
driver_detach+0x1f3/0x2d0 drivers/base/dd.c:1437
bus_remove_driver+0x221/0x2f0 drivers/base/bus.c:792
usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1762
dev_release+0x86/0x200 drivers/usb/gadget/legacy/inode.c:1194
__fput+0x221/0x940 fs/file_table.c:418
delayed_fput+0x58/0x80 fs/file_table.c:441
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
__call_rcu_common kernel/rcu/tree.c:2721 [inline]
call_rcu+0x153/0x900 kernel/rcu/tree.c:2837
fib6_info_release include/net/ip6_fib.h:349 [inline]
__ip6_del_rt+0x111/0x170 net/ipv6/route.c:3928
ip6_del_rt+0xc2/0x110 net/ipv6/route.c:3939
__ipv6_ifa_notify+0x5ed/0xb40 net/ipv6/addrconf.c:6313
addrconf_ifdown+0xe5d/0x18a0 net/ipv6/addrconf.c:3979
addrconf_notify+0x6c6/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x18f/0x380 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2077 [inline]
call_netdevice_notifiers net/core/dev.c:2091 [inline]
dev_close_many+0x2a6/0x410 net/core/dev.c:1632
unregister_netdevice_many_notify+0x4bf/0x1910 net/core/dev.c:11097
vti6_exit_batch_net+0x3d6/0x420 net/ipv6/ip6_vti.c:1204
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x792/0xbb0 net/core/net_namespace.c:652
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
insert_work+0x3d/0x310 kernel/workqueue.c:1670
__queue_work+0xcf4/0xfd0 kernel/workqueue.c:1823
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1747 [inline]
__run_timers+0x59c/0x810 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
The buggy address belongs to the object at ffff88805bbe6400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 96 bytes inside of
freed 512-byte region [ffff88805bbe6400, ffff88805bbe6600)
The buggy address belongs to the physical page:
page:ffffea00016ef900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5bbe4
head:ffffea00016ef900 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017c41c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5782, tgid 5782 (syz-executor), ts 98823623927, free_ts 98819373503
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
prep_new_page mm/page_alloc.c:1589 [inline]
get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
alloc_slab_page+0x5d/0x180 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
__kmem_cache_alloc_node+0x11f/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0xa7/0x240 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:721 [inline]
fib6_info_alloc+0x30/0xf0 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x455/0x1260 net/ipv6/route.c:3805
addrconf_f6i_alloc+0x1fa/0x440 net/ipv6/route.c:4633
fixup_permanent_addr net/ipv6/addrconf.c:3585 [inline]
addrconf_permanent_addr+0x294/0xa50 net/ipv6/addrconf.c:3624
addrconf_notify+0x996/0x1010 net/ipv6/addrconf.c:3696
notifier_call_chain+0x18f/0x380 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2077 [inline]
call_netdevice_notifiers net/core/dev.c:2091 [inline]
__dev_notify_flags+0x1ab/0x310 net/core/dev.c:8762
dev_change_flags+0xde/0x1a0 net/core/dev.c:8800
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
__stack_depot_save+0x587/0x660 lib/stackdepot.c:443
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_set_track+0x5f/0x70 mm/kasan/common.c:53
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc_lru+0x175/0x2b0 mm/slub.c:3526
alloc_inode_sb include/linux/fs.h:2964 [inline]
alloc_inode fs/inode.c:263 [inline]
new_inode_pseudo+0x82/0x1d0 fs/inode.c:1049
new_inode+0x22/0x1d0 fs/inode.c:1075
debugfs_get_inode fs/debugfs/inode.c:72 [inline]
__debugfs_create_file+0x147/0x500 fs/debugfs/inode.c:431
cfg80211_debugfs_rdev_add+0xb7/0xe0 net/wireless/debugfs.c:109
wiphy_register+0x1efe/0x2ac0 net/wireless/core.c:980
ieee80211_register_hw+0x2dd8/0x3b30 net/mac80211/main.c:1426
mac80211_hwsim_new_radio+0x2a75/0x4d70 drivers/net/wireless/virtual/mac80211_hwsim.c:5306
hwsim_new_radio_nl+0xdad/0x1a70 drivers/net/wireless/virtual/mac80211_hwsim.c:5987
genl_family_rcv_msg_doit+0x21a/0x310 net/netlink/genetlink.c:971
Memory state around the buggy address:
ffff88805bbe6300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805bbe6380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805bbe6400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805bbe6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805bbe6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: a1153c0deb44 Linux 6.6.147
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=17d6cdb9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f0bc3d90c30838b5
dashboard link: https://syzkaller.appspot.com/bug?extid=6e21a0f7fbd3594567a3
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9f646bfa1b52/disk-a1153c0d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a2aec2e8f0fd/vmlinux-a1153c0d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a7abe1f87405/bzImage-a1153c0d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e21a0...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:582 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock+0xfc/0xc80 kernel/locking/mutex.c:747
Read of size 8 at addr ffff88805bbe6460 by task syz-executor/12192
CPU: 0 PID: 12192 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
__mutex_lock_common kernel/locking/mutex.c:582 [inline]
__mutex_lock+0xfc/0xc80 kernel/locking/mutex.c:747
ep_open+0x4e/0x270 drivers/usb/gadget/legacy/inode.c:819
do_dentry_open+0x880/0x14b0 fs/open.c:929
do_open fs/namei.c:3640 [inline]
path_openat+0x284f/0x3270 fs/namei.c:3801
do_filp_open+0x1f2/0x430 fs/namei.c:3828
do_sys_openat2+0x134/0x1d0 fs/open.c:1422
do_sys_open fs/open.c:1437 [inline]
__do_sys_openat fs/open.c:1453 [inline]
__se_sys_openat fs/open.c:1448 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1448
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efd1c95e84e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffe18bf0098 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055556b058500 RCX: 00007efd1c95e84e
RDX: 0000000000000000 RSI: 00007ffe18bf0200 RDI: ffffffffffffff9c
RBP: 00007ffe18bf0200 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe18bf12f0
R13: 00007efd1ca3445c R14: 000055556b0584e8 R15: 0000000000000006
</TASK>
Allocated by task 19019:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
activate_ep_files drivers/usb/gadget/legacy/inode.c:1596 [inline]
gadgetfs_bind+0x25f/0x830 drivers/usb/gadget/legacy/inode.c:1687
gadget_bind_driver+0x2b3/0x770 drivers/usb/gadget/udc/core.c:1651
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x247/0xae0 drivers/base/dd.c:717
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879
driver_probe_device+0x4f/0x420 drivers/base/dd.c:909
__driver_attach+0x444/0x6d0 drivers/base/dd.c:1295
bus_for_each_dev+0x235/0x2b0 drivers/base/bus.c:370
bus_add_driver+0x340/0x630 drivers/base/bus.c:723
driver_register+0x23a/0x310 drivers/base/driver.c:246
usb_gadget_register_driver_owner+0xf9/0x270 drivers/usb/gadget/udc/core.c:1730
dev_config+0xe49/0x1260 drivers/usb/gadget/legacy/inode.c:1878
vfs_write+0x299/0x9a0 fs/read_write.c:582
ksys_write+0x151/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 172:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
__kmem_cache_free+0xba/0x1f0 mm/slub.c:3843
destroy_ep_files+0x280/0x340 drivers/usb/gadget/legacy/inode.c:1571
gadgetfs_unbind+0x109/0x2b0 drivers/usb/gadget/legacy/inode.c:1650
gadget_unbind_driver+0x1bf/0x3e0 drivers/usb/gadget/udc/core.c:1702
device_remove drivers/base/dd.c:626 [inline]
__device_release_driver drivers/base/dd.c:1351 [inline]
device_release_driver_internal+0x408/0x6f0 drivers/base/dd.c:1374
driver_detach+0x1f3/0x2d0 drivers/base/dd.c:1437
bus_remove_driver+0x221/0x2f0 drivers/base/bus.c:792
usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1762
dev_release+0x86/0x200 drivers/usb/gadget/legacy/inode.c:1194
__fput+0x221/0x940 fs/file_table.c:418
delayed_fput+0x58/0x80 fs/file_table.c:441
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
__call_rcu_common kernel/rcu/tree.c:2721 [inline]
call_rcu+0x153/0x900 kernel/rcu/tree.c:2837
fib6_info_release include/net/ip6_fib.h:349 [inline]
__ip6_del_rt+0x111/0x170 net/ipv6/route.c:3928
ip6_del_rt+0xc2/0x110 net/ipv6/route.c:3939
__ipv6_ifa_notify+0x5ed/0xb40 net/ipv6/addrconf.c:6313
addrconf_ifdown+0xe5d/0x18a0 net/ipv6/addrconf.c:3979
addrconf_notify+0x6c6/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x18f/0x380 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2077 [inline]
call_netdevice_notifiers net/core/dev.c:2091 [inline]
dev_close_many+0x2a6/0x410 net/core/dev.c:1632
unregister_netdevice_many_notify+0x4bf/0x1910 net/core/dev.c:11097
vti6_exit_batch_net+0x3d6/0x420 net/ipv6/ip6_vti.c:1204
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x792/0xbb0 net/core/net_namespace.c:652
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
insert_work+0x3d/0x310 kernel/workqueue.c:1670
__queue_work+0xcf4/0xfd0 kernel/workqueue.c:1823
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1747 [inline]
__run_timers+0x59c/0x810 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
The buggy address belongs to the object at ffff88805bbe6400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 96 bytes inside of
freed 512-byte region [ffff88805bbe6400, ffff88805bbe6600)
The buggy address belongs to the physical page:
page:ffffea00016ef900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5bbe4
head:ffffea00016ef900 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017c41c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5782, tgid 5782 (syz-executor), ts 98823623927, free_ts 98819373503
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
prep_new_page mm/page_alloc.c:1589 [inline]
get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
alloc_slab_page+0x5d/0x180 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
__kmem_cache_alloc_node+0x11f/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0xa7/0x240 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:721 [inline]
fib6_info_alloc+0x30/0xf0 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x455/0x1260 net/ipv6/route.c:3805
addrconf_f6i_alloc+0x1fa/0x440 net/ipv6/route.c:4633
fixup_permanent_addr net/ipv6/addrconf.c:3585 [inline]
addrconf_permanent_addr+0x294/0xa50 net/ipv6/addrconf.c:3624
addrconf_notify+0x996/0x1010 net/ipv6/addrconf.c:3696
notifier_call_chain+0x18f/0x380 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2077 [inline]
call_netdevice_notifiers net/core/dev.c:2091 [inline]
__dev_notify_flags+0x1ab/0x310 net/core/dev.c:8762
dev_change_flags+0xde/0x1a0 net/core/dev.c:8800
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
__stack_depot_save+0x587/0x660 lib/stackdepot.c:443
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_set_track+0x5f/0x70 mm/kasan/common.c:53
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc_lru+0x175/0x2b0 mm/slub.c:3526
alloc_inode_sb include/linux/fs.h:2964 [inline]
alloc_inode fs/inode.c:263 [inline]
new_inode_pseudo+0x82/0x1d0 fs/inode.c:1049
new_inode+0x22/0x1d0 fs/inode.c:1075
debugfs_get_inode fs/debugfs/inode.c:72 [inline]
__debugfs_create_file+0x147/0x500 fs/debugfs/inode.c:431
cfg80211_debugfs_rdev_add+0xb7/0xe0 net/wireless/debugfs.c:109
wiphy_register+0x1efe/0x2ac0 net/wireless/core.c:980
ieee80211_register_hw+0x2dd8/0x3b30 net/mac80211/main.c:1426
mac80211_hwsim_new_radio+0x2a75/0x4d70 drivers/net/wireless/virtual/mac80211_hwsim.c:5306
hwsim_new_radio_nl+0xdad/0x1a70 drivers/net/wireless/virtual/mac80211_hwsim.c:5987
genl_family_rcv_msg_doit+0x21a/0x310 net/netlink/genetlink.c:971
Memory state around the buggy address:
ffff88805bbe6300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805bbe6380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805bbe6400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805bbe6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805bbe6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot
Aug 1, 2026, 5:40:35 PM (2 days ago) Aug 1
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: a1153c0deb44 Linux 6.6.147
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13a5ee32580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9f646bfa1b52/disk-a1153c0d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a2aec2e8f0fd/vmlinux-a1153c0d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a7abe1f87405/bzImage-a1153c0d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e21a0...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:582 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock+0xfc/0xc80 kernel/locking/mutex.c:747
Read of size 8 at addr ffff888023afa460 by task syz-executor/5890
CPU: 0 PID: 5890 Comm: syz-executor Not tainted syzkaller #0
RAX: ffffffffffffffda RBX: 000055557e0e0500 RCX: 00007f6938f5e84e
RDX: 0000000000000000 RSI: 00007ffdddeeb7f0 RDI: ffffffffffffff9c
RBP: 00007ffdddeeb7f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdddeec8e0
R13: 00007f693903445c R14: 000055557e0e04e8 R15: 0000000000000006
</TASK>
Allocated by task 5932:
The buggy address belongs to the object at ffff888023afa400
The buggy address belongs to the physical page:
page:ffffea00008ebe00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23af8
head:ffffea00008ebe00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
__unfreeze_partials+0x1cf/0x210 mm/slub.c:2667
put_cpu_partial+0x17c/0x250 mm/slub.c:2743
__slab_free+0x319/0x400 mm/slub.c:3700
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
getname_flags+0xbb/0x500 fs/namei.c:140
vfs_fstatat+0x111/0x1b0 fs/stat.c:298
__do_sys_newfstatat fs/stat.c:463 [inline]
__se_sys_newfstatat fs/stat.c:457 [inline]
__x64_sys_newfstatat+0x149/0x1f0 fs/stat.c:457
ffff888023afa380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888023afa400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888023afa480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888023afa500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: a1153c0deb44 Linux 6.6.147
git tree: linux-6.6.y
kernel config: https://syzkaller.appspot.com/x/.config?x=f0bc3d90c30838b5
dashboard link: https://syzkaller.appspot.com/bug?extid=6e21a0f7fbd3594567a3
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=134a2c9e580000
dashboard link: https://syzkaller.appspot.com/bug?extid=6e21a0f7fbd3594567a3
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9f646bfa1b52/disk-a1153c0d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a2aec2e8f0fd/vmlinux-a1153c0d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a7abe1f87405/bzImage-a1153c0d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e21a0...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:582 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock+0xfc/0xc80 kernel/locking/mutex.c:747
CPU: 0 PID: 5890 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
__mutex_lock_common kernel/locking/mutex.c:582 [inline]
__mutex_lock+0xfc/0xc80 kernel/locking/mutex.c:747
ep_open+0x4e/0x270 drivers/usb/gadget/legacy/inode.c:819
do_dentry_open+0x880/0x14b0 fs/open.c:929
do_open fs/namei.c:3640 [inline]
path_openat+0x284f/0x3270 fs/namei.c:3801
do_filp_open+0x1f2/0x430 fs/namei.c:3828
do_sys_openat2+0x134/0x1d0 fs/open.c:1422
do_sys_open fs/open.c:1437 [inline]
__do_sys_openat fs/open.c:1453 [inline]
__se_sys_openat fs/open.c:1448 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1448
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6938f5e84e
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
__mutex_lock_common kernel/locking/mutex.c:582 [inline]
__mutex_lock+0xfc/0xc80 kernel/locking/mutex.c:747
ep_open+0x4e/0x270 drivers/usb/gadget/legacy/inode.c:819
do_dentry_open+0x880/0x14b0 fs/open.c:929
do_open fs/namei.c:3640 [inline]
path_openat+0x284f/0x3270 fs/namei.c:3801
do_filp_open+0x1f2/0x430 fs/namei.c:3828
do_sys_openat2+0x134/0x1d0 fs/open.c:1422
do_sys_open fs/open.c:1437 [inline]
__do_sys_openat fs/open.c:1453 [inline]
__se_sys_openat fs/open.c:1448 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1448
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffdddeeb688 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055557e0e0500 RCX: 00007f6938f5e84e
RDX: 0000000000000000 RSI: 00007ffdddeeb7f0 RDI: ffffffffffffff9c
RBP: 00007ffdddeeb7f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdddeec8e0
R13: 00007f693903445c R14: 000055557e0e04e8 R15: 0000000000000006
</TASK>
Allocated by task 5932:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
activate_ep_files drivers/usb/gadget/legacy/inode.c:1596 [inline]
gadgetfs_bind+0x25f/0x830 drivers/usb/gadget/legacy/inode.c:1687
gadget_bind_driver+0x2b3/0x770 drivers/usb/gadget/udc/core.c:1651
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x247/0xae0 drivers/base/dd.c:717
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879
driver_probe_device+0x4f/0x420 drivers/base/dd.c:909
__driver_attach+0x444/0x6d0 drivers/base/dd.c:1295
bus_for_each_dev+0x235/0x2b0 drivers/base/bus.c:370
bus_add_driver+0x340/0x630 drivers/base/bus.c:723
driver_register+0x23a/0x310 drivers/base/driver.c:246
usb_gadget_register_driver_owner+0xf9/0x270 drivers/usb/gadget/udc/core.c:1730
dev_config+0xe49/0x1260 drivers/usb/gadget/legacy/inode.c:1878
vfs_write+0x299/0x9a0 fs/read_write.c:582
ksys_write+0x151/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 173:
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
activate_ep_files drivers/usb/gadget/legacy/inode.c:1596 [inline]
gadgetfs_bind+0x25f/0x830 drivers/usb/gadget/legacy/inode.c:1687
gadget_bind_driver+0x2b3/0x770 drivers/usb/gadget/udc/core.c:1651
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x247/0xae0 drivers/base/dd.c:717
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879
driver_probe_device+0x4f/0x420 drivers/base/dd.c:909
__driver_attach+0x444/0x6d0 drivers/base/dd.c:1295
bus_for_each_dev+0x235/0x2b0 drivers/base/bus.c:370
bus_add_driver+0x340/0x630 drivers/base/bus.c:723
driver_register+0x23a/0x310 drivers/base/driver.c:246
usb_gadget_register_driver_owner+0xf9/0x270 drivers/usb/gadget/udc/core.c:1730
dev_config+0xe49/0x1260 drivers/usb/gadget/legacy/inode.c:1878
vfs_write+0x299/0x9a0 fs/read_write.c:582
ksys_write+0x151/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 96 bytes inside of
freed 512-byte region [ffff888023afa400, ffff888023afa600)
The buggy address is located 96 bytes inside of
The buggy address belongs to the physical page:
head:ffffea00008ebe00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017c41c80 dead000000000122 0000000000000000
page_type: 0xffffffff()
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5932, tgid 5931 (syz.0.17), ts 102512897312, free_ts 102501796454
page_owner tracks the page as allocated
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
prep_new_page mm/page_alloc.c:1589 [inline]
get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
alloc_slab_page+0x5d/0x180 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
__kmem_cache_alloc_node+0x11f/0x250 mm/slub.c:3534
kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
prep_new_page mm/page_alloc.c:1589 [inline]
get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
alloc_slab_page+0x5d/0x180 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
__kmem_cache_alloc_node+0x11f/0x250 mm/slub.c:3534
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
activate_ep_files drivers/usb/gadget/legacy/inode.c:1596 [inline]
gadgetfs_bind+0x25f/0x830 drivers/usb/gadget/legacy/inode.c:1687
gadget_bind_driver+0x2b3/0x770 drivers/usb/gadget/udc/core.c:1651
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x247/0xae0 drivers/base/dd.c:717
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879
driver_probe_device+0x4f/0x420 drivers/base/dd.c:909
__driver_attach+0x444/0x6d0 drivers/base/dd.c:1295
bus_for_each_dev+0x235/0x2b0 drivers/base/bus.c:370
bus_add_driver+0x340/0x630 drivers/base/bus.c:723
kzalloc include/linux/slab.h:721 [inline]
activate_ep_files drivers/usb/gadget/legacy/inode.c:1596 [inline]
gadgetfs_bind+0x25f/0x830 drivers/usb/gadget/legacy/inode.c:1687
gadget_bind_driver+0x2b3/0x770 drivers/usb/gadget/udc/core.c:1651
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x247/0xae0 drivers/base/dd.c:717
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879
driver_probe_device+0x4f/0x420 drivers/base/dd.c:909
__driver_attach+0x444/0x6d0 drivers/base/dd.c:1295
bus_for_each_dev+0x235/0x2b0 drivers/base/bus.c:370
bus_add_driver+0x340/0x630 drivers/base/bus.c:723
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
discard_slab mm/slub.c:2127 [inline]
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
__unfreeze_partials+0x1cf/0x210 mm/slub.c:2667
put_cpu_partial+0x17c/0x250 mm/slub.c:2743
__slab_free+0x319/0x400 mm/slub.c:3700
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
getname_flags+0xbb/0x500 fs/namei.c:140
vfs_fstatat+0x111/0x1b0 fs/stat.c:298
__do_sys_newfstatat fs/stat.c:463 [inline]
__se_sys_newfstatat fs/stat.c:457 [inline]
__x64_sys_newfstatat+0x149/0x1f0 fs/stat.c:457
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff888023afa300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888023afa380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888023afa400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888023afa480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888023afa500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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#syz test: git://repo/address.git branch-or-commit-hash
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