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2002:a05:6808:1301:b0:493:a850:d93a with SMTP id 5614622812f47-4af5e160463mr10127214b6e.6.1785629440484; Sat, 01 Aug 2026 17:10:40 -0700 (PDT) Date: Sat, 01 Aug 2026 17:10:40 -0700 In-Reply-To: <6a6944f5.e3659fcc.2a40b8.0021.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6e8b00.2d659fcc.1d46f5.01c8.GAE@google.com> Subject: Re: [syzbot] [usb?] WARNING in dummy_free_request (2) From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: e2d5e23967d0 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=179d8649580000 kernel config: https://syzkaller.appspot.com/x/.config?x=72c97575381cec47 dashboard link: https://syzkaller.appspot.com/bug?extid=c73e1942197af9f54ca3 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13b62db9580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17a12c9e580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/294cdababe04/disk-e2d5e239.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3e828c9fa51b/vmlinux-e2d5e239.xz kernel image: https://storage.googleapis.com/syzbot-assets/ffd7614ad310/Image-e2d5e239.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c73e1942197af9f54ca3@syzkaller.appspotmail.com gadgetfs: suspended from state 3 gadgetfs: disconnected ------------[ cut here ]------------ WARNING: drivers/usb/gadget/udc/dummy_hcd.c:710 at dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:710, CPU#0: syz.0.32/4939 Modules linked in: CPU: 0 UID: 0 PID: 4939 Comm: syz.0.32 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:710 lr : dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:710 sp : ffff8000962579d0 x29: ffff8000962579d0 x28: 1fffe000195c4a01 x27: ffff0000cae25008 x26: 1fffe0001a0e2408 x25: 1fffe0001952998b x24: 1fffe000195299aa x23: dfff800000000000 x22: ffff800088b07eb8 x21: ffff800087332200 x20: ffff0000ca94c068 x19: ffff0000d866f900 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 00000000868e5610 x13: 0000000000000001 x12: 0000000000000000 x11: ffff800080156ee8 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff8000835a7208 x2 : 0000000000000001 x1 : ffff0000c82cba80 x0 : 0000000000000000 Call trace: dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:710 (P) usb_ep_free_request+0x108/0x3fc drivers/usb/gadget/udc/core.c:221 gadgetfs_unbind+0x19c/0x1f0 drivers/usb/gadget/legacy/inode.c:1661 gadget_unbind_driver+0x188/0x790 drivers/usb/gadget/udc/core.c:1724 device_remove+0xc4/0x134 drivers/base/dd.c:616 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x124/0x20c drivers/base/dd.c:1372 driver_detach+0x124/0x1b4 drivers/base/dd.c:1435 bus_remove_driver+0x124/0x22c drivers/base/bus.c:832 driver_unregister+0x78/0xac drivers/base/driver.c:202 usb_gadget_unregister_driver+0x50/0x78 drivers/usb/gadget/udc/core.c:1784 dev_release+0x8c/0x15c drivers/usb/gadget/legacy/inode.c:1198 __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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x10c/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 irq event stamp: 2192 hardirqs last enabled at (2191): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:187 [inline] hardirqs last enabled at (2191): [] _raw_spin_unlock_irq+0x30/0x80 kernel/locking/spinlock.c:206 hardirqs last disabled at (2192): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:425 softirqs last enabled at (1170): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (1170): [] handle_softirqs+0xc28/0xd98 kernel/softirq.c:650 softirqs last disabled at (1161): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 ---[ end trace 0000000000000000 ]--- ================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x3c/0x1b8 lib/list_debug.c:49 Read of size 8 at addr ffff0000d866f908 by task syz.0.32/4939 CPU: 1 UID: 0 PID: 4939 Comm: syz.0.32 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN 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 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __list_del_entry_valid_or_report+0x3c/0x1b8 lib/list_debug.c:49 __list_del_entry_valid include/linux/list.h:132 [inline] __list_del_entry include/linux/list.h:246 [inline] list_del_init include/linux/list.h:318 [inline] nuke+0x60/0x194 drivers/usb/gadget/udc/dummy_hcd.c:360 stop_activity drivers/usb/gadget/udc/dummy_hcd.c:379 [inline] dummy_udc_stop+0xe4/0x180 drivers/usb/gadget/udc/dummy_hcd.c:1057 usb_gadget_udc_stop_locked drivers/usb/gadget/udc/core.c:1265 [inline] gadget_unbind_driver+0x204/0x790 drivers/usb/gadget/udc/core.c:1727 device_remove+0xc4/0x134 drivers/base/dd.c:616 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x124/0x20c drivers/base/dd.c:1372 driver_detach+0x124/0x1b4 drivers/base/dd.c:1435 bus_remove_driver+0x124/0x22c drivers/base/bus.c:832 driver_unregister+0x78/0xac drivers/base/driver.c:202 usb_gadget_unregister_driver+0x50/0x78 drivers/usb/gadget/udc/core.c:1784 dev_release+0x8c/0x15c drivers/usb/gadget/legacy/inode.c:1198 __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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x10c/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 Allocated by task 4939: 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] dummy_alloc_request+0x88/0x128 drivers/usb/gadget/udc/dummy_hcd.c:693 usb_ep_alloc_request+0x74/0x480 drivers/usb/gadget/udc/core.c:197 gadgetfs_bind+0x104/0x75c drivers/usb/gadget/legacy/inode.c:1686 gadget_bind_driver+0x274/0x834 drivers/usb/gadget/udc/core.c:1662 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x29c/0x800 drivers/base/dd.c:706 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898 __driver_attach+0x168/0x384 drivers/base/dd.c:1292 bus_for_each_dev+0x128/0x1b4 drivers/base/bus.c:383 driver_attach+0x50/0x60 drivers/base/dd.c:1310 bus_add_driver+0x208/0x500 drivers/base/bus.c:763 driver_register+0x220/0x310 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0xf0/0x25c drivers/usb/gadget/udc/core.c:1752 dev_config+0x91c/0xcc0 drivers/usb/gadget/legacy/inode.c:1883 vfs_write+0x2a4/0xa0c fs/read_write.c:685 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:747 __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 4939: 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 dummy_free_request+0x5c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:711 usb_ep_free_request+0x108/0x3fc drivers/usb/gadget/udc/core.c:221 gadgetfs_unbind+0x19c/0x1f0 drivers/usb/gadget/legacy/inode.c:1661 gadget_unbind_driver+0x188/0x790 drivers/usb/gadget/udc/core.c:1724 device_remove+0xc4/0x134 drivers/base/dd.c:616 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x124/0x20c drivers/base/dd.c:1372 driver_detach+0x124/0x1b4 drivers/base/dd.c:1435 bus_remove_driver+0x124/0x22c drivers/base/bus.c:832 driver_unregister+0x78/0xac drivers/base/driver.c:202 usb_gadget_unregister_driver+0x50/0x78 drivers/usb/gadget/udc/core.c:1784 dev_release+0x8c/0x15c drivers/usb/gadget/legacy/inode.c:1198 __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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x10c/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 ffff0000d866f900 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 8 bytes inside of freed 128-byte region [ffff0000d866f900, ffff0000d866f980) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11866f flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000000 ffff0000c0001a00 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d866f800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d866f880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000d866f900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d866f980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d866fa00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== list_del corruption, ffff0000d866f900->next is NULL ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:53! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 4939 Comm: syz.0.32 Tainted: G B W syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE, [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 634000c5 (nZCv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __list_del_entry_valid_or_report+0xec/0x1b8 lib/list_debug.c:52 lr : __list_del_entry_valid_or_report+0xec/0x1b8 lib/list_debug.c:52 sp : ffff8000962579c0 x29: ffff8000962579c0 x28: 1fffe000195c4a01 x27: ffff0000cae25008 x26: 1fffe000195c4a00 x25: 00000000ffffff94 x24: 1fffe00019529808 x23: dfff800000000000 x22: dfff800000000000 x21: 0338032e0000134b x20: 0000000000000000 x19: ffff0000d866f900 x18: 0000000000000000 x17: 3d3d3d3d3d3d3d3d x16: 3d3d3d3d3d3d3d3d x15: 3d3d3d3d3d3d3d3d x14: 3d3d3d3d3d3d3d3d x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000002 x9 : bfb6b4227df68700 x8 : bfb6b4227df68700 x7 : 0000000000000001 x6 : ffff80008048de94 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800080498bc8 x2 : 0000000100000001 x1 : ffff0000c82cba80 x0 : 0000000000000033 Call trace: __list_del_entry_valid_or_report+0xec/0x1b8 lib/list_debug.c:52 (P) __list_del_entry_valid include/linux/list.h:132 [inline] __list_del_entry include/linux/list.h:246 [inline] list_del_init include/linux/list.h:318 [inline] nuke+0x60/0x194 drivers/usb/gadget/udc/dummy_hcd.c:360 stop_activity drivers/usb/gadget/udc/dummy_hcd.c:379 [inline] dummy_udc_stop+0xe4/0x180 drivers/usb/gadget/udc/dummy_hcd.c:1057 usb_gadget_udc_stop_locked drivers/usb/gadget/udc/core.c:1265 [inline] gadget_unbind_driver+0x204/0x790 drivers/usb/gadget/udc/core.c:1727 device_remove+0xc4/0x134 drivers/base/dd.c:616 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x124/0x20c drivers/base/dd.c:1372 driver_detach+0x124/0x1b4 drivers/base/dd.c:1435 bus_remove_driver+0x124/0x22c drivers/base/bus.c:832 driver_unregister+0x78/0xac drivers/base/driver.c:202 usb_gadget_unregister_driver+0x50/0x78 drivers/usb/gadget/udc/core.c:1784 dev_release+0x8c/0x15c drivers/usb/gadget/legacy/inode.c:1198 __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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x10c/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 Code: f0029ac0 91328000 aa1303e1 979c21eb (d4210000) ---[ end trace 0000000000000000 ]--- --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.