================================================================== BUG: KASAN: slab-use-after-free in __raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline] BUG: KASAN: slab-use-after-free in _raw_spin_lock_irq+0x58/0x70 kernel/locking/spinlock.c:174 Read of size 1 at addr ffff0000d928b018 by task syz.4.344/5677 CPU: 0 UID: 0 PID: 5677 Comm: syz.4.344 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xb0/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0x8c/0xc4 mm/kasan/report.c:595 __kasan_check_byte+0x3c/0x54 mm/kasan/common.c:574 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0xa4/0x364 kernel/locking/lockdep.c:5842 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock_irq+0x58/0x70 kernel/locking/spinlock.c:174 spin_lock_irq include/linux/spinlock.h:372 [inline] gadget_dev_open+0x50/0x1c4 drivers/usb/gadget/legacy/inode.c:1919 do_dentry_open+0x5c4/0xfc0 fs/open.c:947 vfs_open+0x44/0x2dc fs/open.c:1052 do_open fs/namei.c:4700 [inline] path_openat+0x21fc/0x2a60 fs/namei.c:4863 do_file_open+0x1c8/0x2e8 fs/namei.c:4892 do_sys_openat2+0x114/0x1e8 fs/open.c:1368 do_sys_open+0xb0/0xe0 fs/open.c:1374 __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __arm64_sys_openat+0xa8/0xc4 fs/open.c:1385 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Allocated by task 4710: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2e8/0x5ec mm/slub.c:5489 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] dev_new drivers/usb/gadget/legacy/inode.c:176 [inline] gadgetfs_fill_super+0x19c/0x370 drivers/usb/gadget/legacy/inode.c:2054 vfs_get_super+0xb8/0x148 fs/super.c:1273 get_tree_single+0x30/0x40 fs/super.c:1300 gadgetfs_get_tree+0x28/0x38 drivers/usb/gadget/legacy/inode.c:2085 vfs_get_tree+0x90/0x28c fs/super.c:1700 fc_mount+0x24/0xac fs/namespace.c:1198 do_new_mount_fc fs/namespace.c:3765 [inline] do_new_mount+0x2a4/0x538 fs/namespace.c:3841 path_mount+0x5f0/0xa88 fs/namespace.c:4161 do_mount+0xe8/0x148 fs/namespace.c:4174 __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount fs/namespace.c:4367 [inline] __arm64_sys_mount+0x33c/0x388 fs/namespace.c:4367 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Freed by task 5647: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2677 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x188/0x690 mm/slub.c:6692 put_dev+0x8c/0xf8 drivers/usb/gadget/legacy/inode.c:169 dev_release+0x100/0x15c drivers/usb/gadget/legacy/inode.c:1215 __fput+0x338/0x74c fs/file_table.c:512 ____fput+0x20/0x30 fs/file_table.c:540 task_work_run+0x1cc/0x25c kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x58c/0x1a74 kernel/exit.c:1009 do_group_exit+0x198/0x238 kernel/exit.c:1152 get_signal+0xfb0/0x1094 kernel/signal.c:3046 arch_do_signal_or_restart+0x288/0x444c arch/arm64/kernel/signal.c:1665 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x70/0x17c 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] arm64_syscall_exit_to_user_mode arch/arm64/kernel/entry-common.c:88 [inline] el0_svc+0x18c/0x260 arch/arm64/kernel/entry-common.c:737 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 The buggy address belongs to the object at ffff0000d928b000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 24 bytes inside of freed 1024-byte region [ffff0000d928b000, ffff0000d928b400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000d928c800 pfn:0x119288 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000240(workingset|head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000240 ffff0000c0001dc0 fffffdffc3c7fc10 fffffdffc317e810 raw: ffff0000d928c800 000000080010000d 00000000f5000000 0000000000000000 head: 05ffc00000000240 ffff0000c0001dc0 fffffdffc3c7fc10 fffffdffc317e810 head: ffff0000d928c800 000000080010000d 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc364a201 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d928af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d928af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000d928b000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d928b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d928b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in kernel/locking/qspinlock.h:68:9 index 13585 is out of range for type 'unsigned long[8]' CPU: 0 UID: 0 PID: 5677 Comm: syz.4.344 Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 ubsan_epilogue+0x14/0x48 lib/ubsan.c:233 __ubsan_handle_out_of_bounds+0xd0/0xf8 lib/ubsan.c:455 decode_tail kernel/locking/qspinlock.h:68 [inline] queued_spin_lock_slowpath+0x834/0xd04 kernel/locking/qspinlock.c:285 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x21c/0x2d0 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock_irq+0x60/0x70 kernel/locking/spinlock.c:174 spin_lock_irq include/linux/spinlock.h:372 [inline] gadget_dev_open+0x50/0x1c4 drivers/usb/gadget/legacy/inode.c:1919 do_dentry_open+0x5c4/0xfc0 fs/open.c:947 vfs_open+0x44/0x2dc fs/open.c:1052 do_open fs/namei.c:4700 [inline] path_openat+0x21fc/0x2a60 fs/namei.c:4863 do_file_open+0x1c8/0x2e8 fs/namei.c:4892 do_sys_openat2+0x114/0x1e8 fs/open.c:1368 do_sys_open+0xb0/0xe0 fs/open.c:1374 __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __arm64_sys_openat+0xa8/0xc4 fs/open.c:1385 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 ---[ end trace ]--- Unable to handle kernel paging request at virtual address ffff50002add7662 KASAN: maybe wild-memory-access in range [0xfffe800156ebb310-0xfffe800156ebb317] Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000021b01f000 [ffff50002add7662] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 5677 Comm: syz.4.344 Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 834000c5 (Nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x52c/0xd04 kernel/locking/qspinlock.c:288 lr : decode_tail kernel/locking/qspinlock.h:68 [inline] lr : queued_spin_lock_slowpath+0x834/0xd04 kernel/locking/qspinlock.c:285 sp : ffff800097807560 x29: ffff800097807600 x28: fffe800156ebb310 x27: 1fffe0001aebe752 x26: 1fffe0001b251600 x25: ffff0001ade40708 x24: dfff800000000000 x23: ffff700012f00eb0 x22: ffff0001ade40700 x21: 1fffe00035bc80e0 x20: ffff0000d75f3a90 x19: ffff0000d928b000 x18: 0000000000000000 x17: 363a682e6b636f6c x16: 0000000000000001 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000004 x11: ffff70001145ec6c x10: ffff800088ac7700 x9 : ffff800088ac7710 x8 : 1fffd0002add7662 x7 : 0000000000000001 x6 : ffff80008048e080 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f74b4 x2 : 0000000000000002 x1 : ffff0000d75f3a80 x0 : 0000000000000001 Call trace: queued_spin_lock_slowpath+0x52c/0xd04 kernel/locking/qspinlock.c:288 (P) queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x21c/0x2d0 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock_irq+0x60/0x70 kernel/locking/spinlock.c:174 spin_lock_irq include/linux/spinlock.h:372 [inline] gadget_dev_open+0x50/0x1c4 drivers/usb/gadget/legacy/inode.c:1919 do_dentry_open+0x5c4/0xfc0 fs/open.c:947 vfs_open+0x44/0x2dc fs/open.c:1052 do_open fs/namei.c:4700 [inline] path_openat+0x21fc/0x2a60 fs/namei.c:4863 do_file_open+0x1c8/0x2e8 fs/namei.c:4892 do_sys_openat2+0x114/0x1e8 fs/open.c:1368 do_sys_open+0xb0/0xe0 fs/open.c:1374 __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __arm64_sys_openat+0xa8/0xc4 fs/open.c:1385 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Code: f94007e9 f9400388 8b09011c d343ff88 (38786908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: f94007e9 ldr x9, [sp, #8] 4: f9400388 ldr x8, [x28] 8: 8b09011c add x28, x8, x9 c: d343ff88 lsr x8, x28, #3 * 10: 38786908 ldrb w8, [x8, x24] <-- trapping instruction