================================================================== 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 ffff8880309a7060 by task syz-executor/5773 CPU: 0 PID: 5773 Comm: syz-executor 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 __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:3683 [inline] path_openat+0x284f/0x3270 fs/namei.c:3844 do_filp_open+0x1f2/0x430 fs/namei.c:3871 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: 0033:0x7f4cb3d5e98e 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:00007fffc8b8c888 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000055557e236500 RCX: 00007f4cb3d5e98e RDX: 0000000000000000 RSI: 00007fffc8b8c9f0 RDI: ffffffffffffff9c RBP: 00007fffc8b8c9f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffc8b8dae0 R13: 00007f4cb3e344bb R14: 000055557e2364e8 R15: 0000000000000006 Allocated by task 10240: 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:1597 [inline] gadgetfs_bind+0x25f/0x830 drivers/usb/gadget/legacy/inode.c:1688 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:1879 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 10239: 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:1572 gadgetfs_unbind+0x109/0x2b0 drivers/usb/gadget/legacy/inode.c:1651 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 task_work_run+0x1d4/0x260 kernel/task_work.c:245 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0x986/0x2530 kernel/exit.c:890 do_group_exit+0x22d/0x2f0 kernel/exit.c:1032 get_signal+0x12a6/0x1390 kernel/signal.c:2915 arch_do_signal_or_restart+0xc2/0x7b0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213 irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:318 exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 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 kvfree_call_rcu+0xee/0x780 kernel/rcu/tree.c:3452 ipv6_mc_destroy_dev+0x3bf/0x590 net/ipv6/mcast.c:2847 addrconf_ifdown+0x13b8/0x18a0 net/ipv6/addrconf.c:3998 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] unregister_netdevice_many_notify+0x1037/0x1910 net/core/dev.c:11162 unregister_netdevice_many net/core/dev.c:11218 [inline] unregister_netdevice_queue+0x2e9/0x330 net/core/dev.c:11098 unregister_netdevice include/linux/netdevice.h:3191 [inline] __tun_detach+0xdb2/0x1580 drivers/net/tun.c:685 tun_detach drivers/net/tun.c:701 [inline] tun_chr_close+0x10d/0x1c0 drivers/net/tun.c:3525 __fput+0x221/0x940 fs/file_table.c:418 task_work_run+0x1d4/0x260 kernel/task_work.c:245 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213 __syscall_exit_to_user_mode_work kernel/entry/common.c:294 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:305 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff8880309a7000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 96 bytes inside of freed 512-byte region [ffff8880309a7000, ffff8880309a7200) The buggy address belongs to the physical page: page:ffffea0000c26900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x309a4 head:ffffea0000c26900 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 ffffea0000b2a300 dead000000000002 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4991, tgid 4991 (kworker/u4:8), ts 21287984068, free_ts 0 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 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_bprm+0x56/0x9a0 fs/exec.c:1538 kernel_execve+0x98/0x980 fs/exec.c:2023 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 page_owner free stack trace missing Memory state around the buggy address: ffff8880309a6f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880309a6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880309a7000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880309a7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880309a7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================