================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] BUG: KASAN: slab-use-after-free in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: slab-use-after-free in kref_get include/linux/kref.h:45 [inline] BUG: KASAN: slab-use-after-free in config_item_get+0x26/0x90 fs/configfs/item.c:104 Write of size 4 at addr ffff88801fbd671c by task syz.1.162/6133 CPU: 0 PID: 6133 Comm: syz.1.162 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x241/0x290 mm/kasan/generic.c:187 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] kref_get include/linux/kref.h:45 [inline] config_item_get+0x26/0x90 fs/configfs/item.c:104 configfs_get_config_item fs/configfs/configfs_internal.h:128 [inline] get_target fs/configfs/symlink.c:125 [inline] configfs_symlink+0x45e/0xfe0 fs/configfs/symlink.c:191 vfs_symlink+0x138/0x2b0 fs/namei.c:4528 do_symlinkat+0x1ba/0x400 fs/namei.c:4554 __do_sys_symlinkat fs/namei.c:4570 [inline] __se_sys_symlinkat fs/namei.c:4567 [inline] __x64_sys_symlinkat+0x99/0xb0 fs/namei.c:4567 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: 0033:0x7f1df299e0d9 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:00007ffcce2e7168 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007f1df2c25fa0 RCX: 00007f1df299e0d9 RDX: 0000200000000200 RSI: ffffffffffffff9c RDI: 00002000000001c0 RBP: 00007f1df2a35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1df2c25fac R14: 00007f1df2c25fa0 R15: 00007f1df2c25fa0 Allocated by task 6131: 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] phonet_alloc_inst+0x4e/0x180 drivers/usb/gadget/function/f_phonet.c:635 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xdd/0x2e0 drivers/usb/gadget/functions.c:44 function_make+0x11c/0x350 drivers/usb/gadget/configfs.c:625 configfs_mkdir+0x515/0x9e0 fs/configfs/dir.c:1360 vfs_mkdir+0x2a5/0x470 fs/namei.c:4168 do_mkdirat+0x1dc/0x450 fs/namei.c:4191 __do_sys_mkdirat fs/namei.c:4206 [inline] __se_sys_mkdirat fs/namei.c:4204 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4204 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 6131: 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 usb_put_function_instance+0x85/0xa0 drivers/usb/gadget/functions.c:77 config_item_cleanup fs/configfs/item.c:128 [inline] config_item_release+0x133/0x290 fs/configfs/item.c:137 configfs_rmdir+0x8c1/0x980 fs/configfs/dir.c:1571 vfs_rmdir+0x352/0x4b0 fs/namei.c:4251 do_rmdir+0x29f/0x590 fs/namei.c:4310 __do_sys_rmdir fs/namei.c:4329 [inline] __se_sys_rmdir fs/namei.c:4327 [inline] __x64_sys_rmdir+0x49/0x50 fs/namei.c:4327 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 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:1674 __queue_work+0xbfd/0xfd0 kernel/workqueue.c:1823 queue_work_on+0x128/0x1f0 kernel/workqueue.c:1858 queue_work include/linux/workqueue.h:564 [inline] netdevice_queue_work drivers/infiniband/core/roce_gid_mgmt.c:658 [inline] netdevice_event+0x755/0x890 drivers/infiniband/core/roce_gid_mgmt.c:801 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] unregister_netdevice_many_notify+0x1037/0x1910 net/core/dev.c:11124 unregister_netdevice_many net/core/dev.c:11180 [inline] default_device_exit_batch+0x962/0xa00 net/core/dev.c:11746 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:2657 [inline] process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815 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 The buggy address belongs to the object at ffff88801fbd6700 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 28 bytes inside of freed 192-byte region [ffff88801fbd6700, ffff88801fbd67c0) The buggy address belongs to the physical page: page:ffffea00007ef580 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fbd6 ksm flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888017c41a00 ffffea0000863cc0 dead000000000003 raw: 0000000000000000 0000000080100010 00000001ffffffff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 8854793161, free_ts 8841164574 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_page_interleave+0x24/0x1e0 mm/mempolicy.c:2118 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 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] call_usermodehelper_setup+0x8e/0x260 kernel/umh.c:363 kobject_uevent_env+0x661/0x890 lib/kobject_uevent.c:629 device_add+0x5d5/0xc40 drivers/base/core.c:3666 platform_device_add+0x4c3/0x830 drivers/base/platform.c:716 platform_device_register_full+0x472/0x560 drivers/base/platform.c:843 platform_device_register_resndata include/linux/platform_device.h:164 [inline] platform_device_register_simple include/linux/platform_device.h:193 [inline] vkms_create drivers/gpu/drm/vkms/vkms_drv.c:182 [inline] vkms_init+0x194/0x780 drivers/gpu/drm/vkms/vkms_drv.c:250 do_one_initcall+0x242/0x790 init/main.c:1210 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_list+0xbe/0x860 mm/page_alloc.c:2505 release_pages+0x208a/0x2300 mm/swap.c:1022 tlb_batch_pages_flush mm/mmu_gather.c:99 [inline] tlb_flush_mmu_free mm/mmu_gather.c:294 [inline] tlb_flush_mmu+0x379/0x510 mm/mmu_gather.c:301 tlb_finish_mmu+0xf4/0x220 mm/mmu_gather.c:425 exit_mmap+0x428/0xb90 mm/mmap.c:3315 __mmput+0x118/0x3a0 kernel/fork.c:1362 free_bprm+0x144/0x390 fs/exec.c:1514 kernel_execve+0x3e9/0x980 fs/exec.c:2060 call_usermodehelper_exec_async+0x20b/0x350 kernel/umh.c:110 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Memory state around the buggy address: ffff88801fbd6600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801fbd6680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88801fbd6700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801fbd6780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801fbd6800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================