================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x104/0x6634 kernel/locking/lockdep.c:4933 Read of size 8 at addr ffff0000db26a818 by task syz.3.1589/8989 CPU: 1 PID: 8989 Comm: syz.3.1589 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 __lock_acquire+0x104/0x6634 kernel/locking/lockdep.c:4933 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0x70/0x98 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:376 [inline] gadget_dev_open+0x50/0x1c4 drivers/usb/gadget/legacy/inode.c:1914 do_dentry_open+0x738/0xf8c fs/open.c:882 vfs_open+0x7c/0x90 fs/open.c:1015 do_open fs/namei.c:3677 [inline] path_openat+0x1fc0/0x27a0 fs/namei.c:3834 do_filp_open+0x198/0x38c fs/namei.c:3861 do_sys_openat2+0x134/0x3fc 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] __arm64_sys_openat+0x11c/0x150 fs/open.c:1347 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x200/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 3927: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:563 [inline] syslog_print+0x114/0x680 kernel/printk/printk.c:1500 do_syslog+0x310/0x704 kernel/printk/printk.c:1679 __do_sys_syslog kernel/printk/printk.c:1771 [inline] __se_sys_syslog kernel/printk/printk.c:1769 [inline] __arm64_sys_syslog+0x80/0x98 kernel/printk/printk.c:1769 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000db26a800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 24 bytes inside of 1024-byte region [ffff0000db26a800, ffff0000db26ac00) The buggy address belongs to the physical page: page:00000000366bd23f refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000db269000 pfn:0x11b268 head:00000000366bd23f order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc00030f8c08 fffffc0003740608 ffff0000c0002780 raw: ffff0000db269000 0000000000100003 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000db26a700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000db26a780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000db26a800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000db26a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000db26a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000017 KASAN: null-ptr-deref in range [0x00000000000000b8-0x00000000000000bf] Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 [dfff800000000017] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 8989 Comm: syz.3.1589 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 824000c5 (Nzcv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4728 [inline] pc : __lock_acquire+0x4a4/0x6634 kernel/locking/lockdep.c:5013 lr : hlock_class kernel/locking/lockdep.c:232 [inline] lr : check_wait_context kernel/locking/lockdep.c:4728 [inline] lr : __lock_acquire+0x690/0x6634 kernel/locking/lockdep.c:5013 sp : ffff8000217273e0 x29: ffff8000217275e0 x28: ffff0000cfd15e70 x27: ffff0000cfd15e78 x26: ffff0000cfd15e98 x25: ffff0000cfd15e5c x24: dfff800000000000 x23: 0000000000000000 x22: 0000000000000000 x21: 0000000000001523 x20: ffff0000cfd15e9c x19: 00000000000000b8 x18: 1fffe00033e7457e x17: 0000000000000000 x16: ffff800011b9e758 x15: 0000000000000002 x14: 0000000000000001 x13: 1ffff00002ff216c x12: 0000000000080000 x11: 000000000001d5cb x10: ffff8000274ba000 x9 : ffff80000a90b42c x8 : 0000000000000017 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800021726db8 x4 : ffff800015474e80 x3 : ffff8000082e0608 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: check_wait_context kernel/locking/lockdep.c:4728 [inline] __lock_acquire+0x4a4/0x6634 kernel/locking/lockdep.c:5013 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0x70/0x98 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:376 [inline] gadget_dev_open+0x50/0x1c4 drivers/usb/gadget/legacy/inode.c:1914 do_dentry_open+0x738/0xf8c fs/open.c:882 vfs_open+0x7c/0x90 fs/open.c:1015 do_open fs/namei.c:3677 [inline] path_openat+0x1fc0/0x27a0 fs/namei.c:3834 do_filp_open+0x198/0x38c fs/namei.c:3861 do_sys_openat2+0x134/0x3fc 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] __arm64_sys_openat+0x11c/0x150 fs/open.c:1347 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x200/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Code: 34000fc8 aa1f03e8 9102e113 d343fe68 (38f86908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 34000fc8 cbz w8, 0x1f8 4: aa1f03e8 mov x8, xzr 8: 9102e113 add x19, x8, #0xb8 c: d343fe68 lsr x8, x19, #3 * 10: 38f86908 ldrsb w8, [x8, x24] <-- trapping instruction