================================================================== BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:625 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock+0x14e/0x15a0 kernel/locking/mutex.c:821 Read of size 8 at addr ffff888058991058 by task syz-executor/7520 CPU: 0 UID: 0 PID: 7520 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __mutex_lock_common kernel/locking/mutex.c:625 [inline] __mutex_lock+0x14e/0x15a0 kernel/locking/mutex.c:821 ep_open+0x4e/0x270 drivers/usb/gadget/legacy/inode.c:832 do_dentry_open+0x80e/0x1360 fs/open.c:1000 vfs_open_consume+0x4a/0x350 fs/open.c:1131 do_open fs/namei.c:4913 [inline] path_openat+0x14d7/0x1e40 fs/namei.c:5078 do_file_open+0x23e/0x4a0 fs/namei.c:5107 do_sys_openat2+0x115/0x200 fs/open.c:1452 do_sys_open fs/open.c:1458 [inline] __do_sys_openat fs/open.c:1474 [inline] __se_sys_openat fs/open.c:1469 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1469 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f295595e98e 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 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007ffc0b3df048 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000555591550500 RCX: 00007f295595e98e RDX: 0000000000000000 RSI: 00007ffc0b3df1b0 RDI: ffffffffffffff9c RBP: 00007ffc0b3df1b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc0b3e02a0 R13: 00007f2955a3448b R14: 00005555915504e8 R15: 00007ffc0b3e1370 Allocated by task 9857: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x31c/0x600 mm/slub.c:5599 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] activate_ep_files drivers/usb/gadget/legacy/inode.c:1611 [inline] gadgetfs_bind+0x277/0xad0 drivers/usb/gadget/legacy/inode.c:1702 gadget_bind_driver+0x2ca/0x9e0 drivers/usb/gadget/udc/core.c:1662 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __driver_attach+0x339/0x600 drivers/base/dd.c:1292 bus_for_each_dev+0x23b/0x2c0 drivers/base/bus.c:383 bus_add_driver+0x345/0x670 drivers/base/bus.c:763 driver_register+0x23a/0x320 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0xf9/0x270 drivers/usb/gadget/udc/core.c:1752 dev_config+0xe3c/0x12a0 drivers/usb/gadget/legacy/inode.c:1893 vfs_write+0x296/0xba0 fs/read_write.c:685 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5716: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2779 [inline] slab_free mm/slub.c:6544 [inline] kfree+0x1c5/0x650 mm/slub.c:6837 destroy_ep_files+0x29f/0x330 drivers/usb/gadget/legacy/inode.c:1592 gadgetfs_unbind+0x109/0x2b0 drivers/usb/gadget/legacy/inode.c:1665 gadget_unbind_driver+0x1cb/0x410 drivers/usb/gadget/udc/core.c:1724 device_remove drivers/base/dd.c:616 [inline] __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372 driver_detach+0x1f3/0x2d0 drivers/base/dd.c:1435 bus_remove_driver+0x226/0x320 drivers/base/bus.c:832 usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1784 dev_release+0x83/0x200 drivers/usb/gadget/legacy/inode.c:1207 __fput+0x413/0xa50 fs/file_table.c:513 delayed_fput+0x63/0xa0 fs/file_table.c:536 process_one_work kernel/workqueue.c:3407 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3490 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3571 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff888058991000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 88 bytes inside of freed 512-byte region [ffff888058991000, ffff888058991200) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x58990 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b041c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b041c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5617, tgid 5617 (syz-executor), ts 68361340715 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1853 prep_new_page mm/page_alloc.c:1861 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3925 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5430 alloc_slab_page mm/slub.c:3378 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3493 new_slab mm/slub.c:3544 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7453 refill_sheaf mm/slub.c:2916 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4805 alloc_from_pcs mm/slub.c:4881 [inline] slab_alloc_node mm/slub.c:5015 [inline] __do_kmalloc_node mm/slub.c:5449 [inline] __kmalloc_noprof+0x476/0x710 mm/slub.c:5475 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] fib6_info_alloc+0x30/0xf0 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x149/0x890 net/ipv6/route.c:3833 ip6_route_add+0x49/0x1b0 net/ipv6/route.c:3962 addrconf_prefix_route+0x3a2/0x480 net/ipv6/addrconf.c:2507 addrconf_add_linklocal+0x266/0x460 net/ipv6/addrconf.c:3340 addrconf_addr_gen+0x2f8/0x360 net/ipv6/addrconf.c:3474 addrconf_notify+0xb1e/0x1050 net/ipv6/addrconf.c:3779 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:86 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline] call_netdevice_notifiers net/core/dev.c:2327 [inline] __dev_notify_flags+0x31e/0x510 net/core/dev.c:9853 page last free pid 1 tgid 1 ts 20141595953 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1400 [inline] free_pages_prepare+0x9eb/0xaf0 mm/page_alloc.c:1445 __free_contig_range_common+0x174/0x340 mm/page_alloc.c:7066 destroy_args+0x4e5/0x570 mm/debug_vm_pgtable.c:993 debug_vm_pgtable+0x3f8/0x410 mm/debug_vm_pgtable.c:1368 do_one_initcall+0x250/0x870 init/main.c:1357 do_initcall_level+0x10a/0x1a0 init/main.c:1419 do_initcalls+0x59/0xa0 init/main.c:1435 kernel_init_freeable+0x29d/0x3e0 init/main.c:1670 kernel_init+0x22/0x1d0 init/main.c:1560 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888058990f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888058990f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888058991000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888058991080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888058991100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================