================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_inc include/linux/atomic/atomic-instrumented.h:435 [inline] BUG: KASAN: slab-use-after-free in usb_anchor_suspend_wakeups+0x2c/0x74 drivers/usb/core/urb.c:910 Write of size 4 at addr ffff0000c7b37110 by task syz.4.208/8093 CPU: 0 UID: 0 PID: 8093 Comm: syz.4.208 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 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+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:200 __kasan_check_write+0x20/0x30 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_inc include/linux/atomic/atomic-instrumented.h:435 [inline] usb_anchor_suspend_wakeups+0x2c/0x74 drivers/usb/core/urb.c:910 __usb_hcd_giveback_urb+0x1f4/0x58c drivers/usb/core/hcd.c:1648 usb_hcd_giveback_urb+0x100/0x364 drivers/usb/core/hcd.c:1745 dummy_timer+0x644/0x33c8 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x41c/0xb78 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x160/0x400 kernel/time/hrtimer.c:1858 handle_softirqs+0x328/0xc88 kernel/softirq.c:622 __do_softirq+0x14/0x20 kernel/softirq.c:656 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:68 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73 invoke_softirq kernel/softirq.c:503 [inline] __irq_exit_rcu+0x1b0/0x478 kernel/softirq.c:723 irq_exit_rcu+0x14/0x84 kernel/softirq.c:739 __el1_irq arch/arm64/kernel/entry-common.c:498 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:510 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:515 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 (P) __debug_object_init+0x1a0/0x40c lib/debugobjects.c:755 debug_object_init_on_stack+0x20/0x2c lib/debugobjects.c:794 debug_hrtimer_init_on_stack kernel/time/hrtimer.c:432 [inline] debug_setup_on_stack kernel/time/hrtimer.c:470 [inline] hrtimer_setup_sleeper_on_stack kernel/time/hrtimer.c:2083 [inline] hrtimer_nanosleep+0xb4/0x2a4 kernel/time/hrtimer.c:2161 common_nsleep+0xa0/0xb8 kernel/time/posix-timers.c:1352 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1398 [inline] __se_sys_clock_nanosleep kernel/time/posix-timers.c:1375 [inline] __arm64_sys_clock_nanosleep+0x334/0x370 kernel/time/posix-timers.c:1375 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Allocated by task 8094: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:573 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __kmalloc_cache_noprof+0x3a4/0x65c mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] usbtmc_open+0xa8/0x78c drivers/usb/class/usbtmc.c:175 usb_open+0x138/0x1c8 drivers/usb/core/file.c:47 chrdev_open+0x1b0/0x4b0 fs/char_dev.c:414 do_dentry_open+0x7a4/0x10bc fs/open.c:965 vfs_open+0x44/0x2d4 fs/open.c:1097 do_open fs/namei.c:3975 [inline] path_openat+0x2424/0x2c40 fs/namei.c:4134 do_filp_open+0x18c/0x36c fs/namei.c:4161 do_sys_openat2+0x11c/0x1b4 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1463 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 8094: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 __kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2543 [inline] slab_free mm/slub.c:6642 [inline] kfree+0x184/0x600 mm/slub.c:6849 usbtmc_release+0x238/0x298 drivers/usb/class/usbtmc.c:261 __fput+0x340/0x75c fs/file_table.c:468 ____fput+0x20/0x58 fs/file_table.c:496 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xfc/0x178 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000c7b37000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 272 bytes inside of freed 1024-byte region [ffff0000c7b37000, ffff0000c7b37400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107b30 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0001dc0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0001dc0 dead000000000122 0000000000000000 head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc31ecc01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c7b37000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c7b37080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000c7b37100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c7b37180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c7b37200: 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 dfff800000000004 KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000004] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 8093 Comm: syz.4.208 Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 434000c5 (nZcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : set_dev_info drivers/base/core.c:-1 [inline] pc : dev_vprintk_emit+0x108/0x390 drivers/base/core.c:4912 lr : set_dev_info drivers/base/core.c:4870 [inline] lr : dev_vprintk_emit+0xdc/0x390 drivers/base/core.c:4912 sp : ffff800097957500 x29: ffff800097957600 x28: dfff800000000000 x27: ffff800097957520 x26: ffff700012f2aea4 x25: 0000000000000033 x24: 0000000000000020 x23: ffff80008fe24b98 x22: ffff800097957540 x21: ffff8000979576a0 x20: 0000000000000003 x19: ffff80008c3e8de0 x18: 0000000000000000 x17: 3d3d3d3d3d3d3d3d x16: ffff80008ad6b188 x15: 0000000000000008 x14: 1ffff00012f2aea8 x13: 0000000000000000 x12: 0000000000000000 x11: ffff700012f2aeb0 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000004 x7 : 0000000000000000 x6 : ffff800097957790 x5 : ffff8000979576c0 x4 : 0000000000000000 x3 : ffff8000801559d4 x2 : ffffffffffffffc0 x1 : 0000000000000000 x0 : ffff800097957540 Call trace: set_dev_info drivers/base/core.c:-1 [inline] (P) dev_vprintk_emit+0x108/0x390 drivers/base/core.c:4912 (P) dev_printk_emit+0xd4/0x11c drivers/base/core.c:4925 __dev_printk+0x16c/0x1a0 drivers/base/core.c:4937 _dev_err+0xec/0x138 drivers/base/core.c:4980 usbtmc_read_bulk_cb+0x214/0x394 drivers/usb/class/usbtmc.c:787 __usb_hcd_giveback_urb+0x308/0x58c drivers/usb/core/hcd.c:1661 usb_hcd_giveback_urb+0x100/0x364 drivers/usb/core/hcd.c:1745 dummy_timer+0x644/0x33c8 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x41c/0xb78 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x160/0x400 kernel/time/hrtimer.c:1858 handle_softirqs+0x328/0xc88 kernel/softirq.c:622 __do_softirq+0x14/0x20 kernel/softirq.c:656 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:68 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73 invoke_softirq kernel/softirq.c:503 [inline] __irq_exit_rcu+0x1b0/0x478 kernel/softirq.c:723 irq_exit_rcu+0x14/0x84 kernel/softirq.c:739 __el1_irq arch/arm64/kernel/entry-common.c:498 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:510 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:515 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 (P) __debug_object_init+0x1a0/0x40c lib/debugobjects.c:755 debug_object_init_on_stack+0x20/0x2c lib/debugobjects.c:794 debug_hrtimer_init_on_stack kernel/time/hrtimer.c:432 [inline] debug_setup_on_stack kernel/time/hrtimer.c:470 [inline] hrtimer_setup_sleeper_on_stack kernel/time/hrtimer.c:2083 [inline] hrtimer_nanosleep+0xb4/0x2a4 kernel/time/hrtimer.c:2161 common_nsleep+0xa0/0xb8 kernel/time/posix-timers.c:1352 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1398 [inline] __se_sys_clock_nanosleep kernel/time/posix-timers.c:1375 [inline] __arm64_sys_clock_nanosleep+0x334/0x370 kernel/time/posix-timers.c:1375 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Code: f9400318 b4000b98 94178674 d343ff08 (387c6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: f9400318 ldr x24, [x24] 4: b4000b98 cbz x24, 0x174 8: 94178674 bl 0x5e19d8 c: d343ff08 lsr x8, x24, #3 * 10: 387c6908 ldrb w8, [x8, x28] <-- trapping instruction