================================================================== BUG: KASAN: slab-use-after-free in __raw_spin_lock_irq include/linux/spinlock_api_smp.h:165 [inline] BUG: KASAN: slab-use-after-free in _raw_spin_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:189 Read of size 1 at addr ffff888078ab6018 by task syz.6.1121/13365 CPU: 0 UID: 0 PID: 13365 Comm: syz.6.1121 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 __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x7d/0x350 kernel/locking/lockdep.c:5916 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:165 [inline] _raw_spin_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:189 spin_lock_irq include/linux/spinlock.h:377 [inline] gadget_dev_open+0x4b/0x1b0 drivers/usb/gadget/legacy/inode.c:1929 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: 0033:0x7fa23799e159 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:00007fa238886028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fa237c25fa0 RCX: 00007fa23799e159 RDX: 0000000000000002 RSI: 0000200000000300 RDI: ffffffffffffff9c RBP: 00007fa237a3503b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa237c26038 R14: 00007fa237c25fa0 R15: 00007fff3524dbf8 Allocated by task 5618: 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:5568 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] dev_new drivers/usb/gadget/legacy/inode.c:176 [inline] gadgetfs_fill_super+0x27b/0x790 drivers/usb/gadget/legacy/inode.c:2064 vfs_get_super fs/super.c:1391 [inline] get_tree_single+0xc0/0x150 fs/super.c:1418 vfs_get_tree+0x92/0x2a0 fs/super.c:1933 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4396 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4373 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 13308: 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:2748 [inline] slab_free mm/slub.c:6505 [inline] kfree+0x1c5/0x650 mm/slub.c:6798 put_dev drivers/usb/gadget/legacy/inode.c:169 [inline] dev_release+0x164/0x200 drivers/usb/gadget/legacy/inode.c:1224 __fput+0x413/0xa50 fs/file_table.c:513 task_work_run+0x1d9/0x260 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x73a/0x2360 kernel/exit.c:1008 do_group_exit+0x22d/0x2f0 kernel/exit.c:1151 get_signal+0x1216/0x12c0 kernel/signal.c:3051 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888078ab6000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 24 bytes inside of freed 1024-byte region [ffff888078ab6000, ffff888078ab6400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888078ab1000 pfn:0x78ab0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88813ff1adc0 ffffea0001f30410 ffffea0000a4e610 raw: ffff888078ab1000 000000000010000c 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88813ff1adc0 ffffea0001f30410 ffffea0000a4e610 head: ffff888078ab1000 000000000010000c 00000000f5000000 0000000000000000 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5618, tgid 5618 (syz-executor), ts 90559646794 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:5418 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7416 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __do_kmalloc_node mm/slub.c:5418 [inline] __kmalloc_noprof+0x476/0x710 mm/slub.c:5444 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] tomoyo_init_log+0x1a6b/0x1f60 security/tomoyo/audit.c:273 tomoyo_supervisor+0x35f/0x1550 security/tomoyo/common.c:2232 tomoyo_audit_mount_log security/tomoyo/mount.c:33 [inline] tomoyo_mount_acl security/tomoyo/mount.c:168 [inline] tomoyo_mount_permission+0x670/0x9e0 security/tomoyo/mount.c:239 security_sb_mount+0xe4/0x320 security/security.c:1102 path_mount+0xbc/0x1050 fs/namespace.c:4110 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4396 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4373 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 page last free pid 5278 tgid 5278 ts 54827979454 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1400 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2944 __slab_free+0x274/0x2c0 mm/slub.c:5820 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] __do_kmalloc_node mm/slub.c:5418 [inline] __kmalloc_node_noprof+0x44b/0x720 mm/slub.c:5431 _kmalloc_node_noprof include/linux/slab.h:1200 [inline] qdisc_alloc+0x92/0x9d0 net/sched/sch_generic.c:998 qdisc_create_dflt+0x8e/0x4e0 net/sched/sch_generic.c:1053 attach_one_default_qdisc net/sched/sch_generic.c:1219 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2749 [inline] attach_default_qdiscs net/sched/sch_generic.c:1237 [inline] dev_activate+0x37a/0x1150 net/sched/sch_generic.c:1296 __dev_open+0x699/0x850 net/core/dev.c:1733 __dev_change_flags+0x329/0x820 net/core/dev.c:9812 netif_change_flags+0x7c/0x1b0 net/core/dev.c:9877 dev_change_flags+0x128/0x260 net/core/dev_api.c:68 devinet_ioctl+0x966/0x1c50 net/ipv4/devinet.c:1199 inet_ioctl+0x42a/0x560 net/ipv4/af_inet.c:1009 sock_do_ioctl+0x101/0x320 net/socket.c:1325 Memory state around the buggy address: ffff888078ab5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888078ab5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888078ab6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888078ab6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888078ab6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================