R10: 0000000000000024 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7ae6e26038 R14: 00007f7ae6e25fa0 R15: 00007ffce7758fc8 ERROR: Out of memory at tomoyo_realpath_from_path. ================================================================== BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:582 [inline] BUG: KASAN: use-after-free in __mutex_lock+0xf4/0xae0 kernel/locking/mutex.c:747 Read of size 8 at addr ffff8880247ac060 by task syz.7.3639/19438 CPU: 1 PID: 19438 Comm: syz.7.3639 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 __mutex_lock_common kernel/locking/mutex.c:582 [inline] __mutex_lock+0xf4/0xae0 kernel/locking/mutex.c:747 ep_open+0x4a/0x260 drivers/usb/gadget/legacy/inode.c:819 do_dentry_open+0x7dd/0x10b0 fs/open.c:882 do_open fs/namei.c:3677 [inline] path_openat+0x2674/0x2f10 fs/namei.c:3834 do_filp_open+0x1ee/0x420 fs/namei.c:3861 do_sys_openat2+0x14b/0x4f0 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1347 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f7ae6b9f559 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:00007f7ae4df6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f7ae6e25fa0 RCX: 00007f7ae6b9f559 RDX: 0000000000000002 RSI: 0000200000000240 RDI: ffffffffffffff9c RBP: 00007f7ae6c36b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000024 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7ae6e26038 R14: 00007f7ae6e25fa0 R15: 00007ffce7758fc8 Allocated by task 19438: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] activate_ep_files drivers/usb/gadget/legacy/inode.c:1597 [inline] gadgetfs_bind+0x25b/0x820 drivers/usb/gadget/legacy/inode.c:1688 gadget_bind_driver+0x2af/0x760 drivers/usb/gadget/udc/core.c:1656 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24a/0xb40 drivers/base/dd.c:638 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834 __driver_attach+0x43d/0x6c0 drivers/base/dd.c:1220 bus_for_each_dev+0x182/0x1f0 drivers/base/bus.c:303 bus_add_driver+0x324/0x5d0 drivers/base/bus.c:620 driver_register+0x32d/0x430 drivers/base/driver.c:246 usb_gadget_register_driver_owner+0xf5/0x260 drivers/usb/gadget/udc/core.c:1735 dev_config+0xe45/0x1260 drivers/usb/gadget/legacy/inode.c:1879 vfs_write+0x2dc/0x9a0 fs/read_write.c:582 ksys_write+0x14d/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 19446: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xb6/0x200 mm/slub.c:3700 destroy_ep_files+0x280/0x340 drivers/usb/gadget/legacy/inode.c:1572 gadgetfs_unbind+0x105/0x2a0 drivers/usb/gadget/legacy/inode.c:1651 gadget_unbind_driver+0x1bb/0x3d0 drivers/usb/gadget/udc/core.c:1707 device_remove drivers/base/dd.c:547 [inline] __device_release_driver drivers/base/dd.c:1279 [inline] device_release_driver_internal+0x47d/0x7c0 drivers/base/dd.c:1305 driver_detach+0x1ef/0x2d0 drivers/base/dd.c:1368 bus_remove_driver+0x11c/0x230 drivers/base/bus.c:679 usb_gadget_unregister_driver+0x4a/0x70 drivers/usb/gadget/udc/core.c:1767 dev_release+0x82/0x1f0 drivers/usb/gadget/legacy/inode.c:1194 __fput+0x20a/0x8b0 fs/file_table.c:320 task_work_run+0x1d0/0x260 kernel/task_work.c:203 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:295 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:306 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 call_rcu+0x14f/0x950 kernel/rcu/tree.c:2849 inetdev_destroy net/ipv4/devinet.c:333 [inline] inetdev_event+0x76f/0x13f0 net/ipv4/devinet.c:1615 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] unregister_netdevice_many_notify+0x10b1/0x1990 net/core/dev.c:11024 unregister_netdevice_many net/core/dev.c:11078 [inline] default_device_exit_batch+0x95e/0x9f0 net/core/dev.c:11550 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x78e/0xba0 net/core/net_namespace.c:640 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 call_rcu+0x14f/0x950 kernel/rcu/tree.c:2849 fib6_info_release include/net/ip6_fib.h:342 [inline] ip6_route_add+0xe0/0x130 net/ipv6/route.c:3901 addrconf_add_mroute net/ipv6/addrconf.c:2514 [inline] addrconf_add_dev+0x298/0x3a0 net/ipv6/addrconf.c:2532 inet6_addr_add+0x1a9/0x9c0 net/ipv6/addrconf.c:2996 inet6_rtm_newaddr+0x6c9/0x8f0 net/ipv6/addrconf.c:4988 rtnetlink_rcv_msg+0x863/0xfb0 net/core/rtnetlink.c:6166 netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x497/0x650 net/socket.c:2153 __do_sys_sendto net/socket.c:2165 [inline] __se_sys_sendto net/socket.c:2161 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2161 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff8880247ac000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 96 bytes inside of 512-byte region [ffff8880247ac000, ffff8880247ac200) The buggy address belongs to the physical page: page:ffffea000091eb00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x247ac head:ffffea000091eb00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888018441c80 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 822, tgid 822 (kworker/u4:2), ts 9106911256, free_ts 9092871233 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2d0 mm/slub.c:1997 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] alloc_bprm+0x56/0x710 fs/exec.c:1543 kernel_execve+0x94/0x980 fs/exec.c:2010 call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:113 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509 __stack_depot_save+0x44d/0x480 lib/stackdepot.c:506 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_set_track+0x60/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc+0x18b/0x2f0 mm/slub.c:3383 kmem_cache_zalloc include/linux/slab.h:689 [inline] lsm_inode_alloc security/security.c:600 [inline] security_inode_alloc+0x30/0x110 security/security.c:1044 inode_init_always+0x910/0xc90 fs/inode.c:232 alloc_inode fs/inode.c:268 [inline] new_inode_pseudo+0x91/0x1c0 fs/inode.c:1063 new_inode+0x25/0x1d0 fs/inode.c:1091 debugfs_get_inode fs/debugfs/inode.c:72 [inline] __debugfs_create_file+0x147/0x500 fs/debugfs/inode.c:432 debugfs_create_files block/blk-mq-debugfs.c:677 [inline] blk_mq_debugfs_register_ctx block/blk-mq-debugfs.c:723 [inline] blk_mq_debugfs_register_hctx+0x599/0x6f0 block/blk-mq-debugfs.c:742 blk_mq_debugfs_register+0x29d/0x410 block/blk-mq-debugfs.c:699 blk_register_queue+0x21c/0x3d0 block/blk-sysfs.c:822 device_add_disk+0x641/0x1020 block/genhd.c:515 Memory state around the buggy address: ffff8880247abf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880247abf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880247ac000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880247ac080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880247ac100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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