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SMTP id 5614622812f47-4ad5b94bbc8mr1603167b6e.4.1785246758353; Tue, 28 Jul 2026 06:52:38 -0700 (PDT) Date: Tue, 28 Jul 2026 06:52:38 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a68b426.b6659fcc.241ab8.00e9.GAE@google.com> Subject: [syzbot] [usb?] general protection fault in f_midi2_free_ep_reqs 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" Hello, syzbot found the following issue on: HEAD commit: 4235cb24ec1e Merge tag 'vfs-7.2-rc5.fixes' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13b86449580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=01a17afb30637396955e compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17aaa7b1580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16341632580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-4235cb24.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0220bd6b47b0/vmlinux-4235cb24.xz kernel image: https://storage.googleapis.com/syzbot-assets/b7fcbec12504/bzImage-4235cb24.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+01a17afb30637396955e@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc00000000e6: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000730-0x0000000000000737] CPU: 2 UID: 0 PID: 56 Comm: kworker/2:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: usb_hub_wq hub_event RIP: 0010:f_midi2_free_ep_reqs+0x56/0x2b0 drivers/usb/gadget/function/f_midi2.c:1166 Code: 85 6a 02 00 00 49 8b 45 00 48 89 44 24 18 48 05 30 07 00 00 48 89 c2 48 89 44 24 20 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e b5 01 00 00 48 8b 44 24 18 31 RSP: 0018:ffffc900006489e8 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: ffff8880559b0000 RCX: ffffffff87e7a829 RDX: 00000000000000e6 RSI: ffffffff87e7a666 RDI: ffff8880559b0128 RBP: ffff8880559b0128 R08: 0000000000000004 R09: 0000000000000020 R10: 0000000000000020 R11: 000000000000758b R12: ffff8880559b00f0 R13: ffff8880559b0128 R14: ffff8880559b0740 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880d5fdc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000033e4100 CR3: 0000000030cc7000 CR4: 0000000000352ef0 Call Trace: f_midi2_stop_eps drivers/usb/gadget/function/f_midi2.c:1246 [inline] f_midi2_set_alt+0x444/0x5f0 drivers/usb/gadget/function/f_midi2.c:1296 composite_setup+0x16f8/0x9290 drivers/usb/gadget/composite.c:1933 configfs_composite_setup+0xfb/0x130 drivers/usb/gadget/configfs.c:1877 dummy_timer+0x2045/0x36f0 drivers/usb/gadget/udc/dummy_hcd.c:1951 __run_hrtimer kernel/time/hrtimer.c:2032 [inline] __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x17d/0x2c0 kernel/time/hrtimer.c:2113 handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 56 f0 27 f6 48 89 df e8 de 3f 28 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 a5 4f 17 f6 65 8b 05 ee 38 a6 08 85 c0 74 16 5b RSP: 0018:ffffc90000a9e778 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff88806a626280 RCX: 0000000000000040 RDX: 0000000000000000 RSI: ffffffff8e1a5b18 RDI: ffffffff8c401580 RBP: 0000000000000283 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88806a626280 R13: 0000000000000000 R14: 00000000ffffffff R15: ffff88806a6262c8 __mod_timer+0x409/0xca0 kernel/time/timer.c:1139 add_timer+0x62/0x90 kernel/time/timer.c:1249 schedule_timeout+0x122/0x280 kernel/time/sleep_timeout.c:98 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common+0x2e7/0x4c0 kernel/sched/completion.c:121 usb_start_wait_urb+0x2ae/0x580 drivers/usb/core/message.c:72 usb_internal_control_msg drivers/usb/core/message.c:117 [inline] usb_control_msg+0x328/0x4b0 drivers/usb/core/message.c:167 usb_control_msg_send+0xca/0x130 drivers/usb/core/message.c:226 usb_set_interface+0x9b6/0xe20 drivers/usb/core/message.c:1649 snd_usb_midi_v2_create+0x629/0x4070 sound/usb/midi2.c:1120 snd_usb_create_stream.isra.0+0x386/0x4d0 sound/usb/card.c:290 snd_usb_create_streams sound/usb/card.c:392 [inline] usb_audio_probe+0xf05/0x3b10 sound/usb/card.c:1031 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x64/0x160 drivers/base/bus.c:620 device_add+0x121d/0x1970 drivers/base/core.c:3772 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x64/0x160 drivers/base/bus.c:620 device_add+0x121d/0x1970 drivers/base/core.c:3772 usb_new_device.cold+0x685/0x115c drivers/usb/core/hub.c:2695 hub_port_connect drivers/usb/core/hub.c:5567 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x30a3/0x4a60 drivers/usb/core/hub.c:5953 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:f_midi2_free_ep_reqs+0x56/0x2b0 drivers/usb/gadget/function/f_midi2.c:1166 Code: 85 6a 02 00 00 49 8b 45 00 48 89 44 24 18 48 05 30 07 00 00 48 89 c2 48 89 44 24 20 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e b5 01 00 00 48 8b 44 24 18 31 RSP: 0018:ffffc900006489e8 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: ffff8880559b0000 RCX: ffffffff87e7a829 RDX: 00000000000000e6 RSI: ffffffff87e7a666 RDI: ffff8880559b0128 RBP: ffff8880559b0128 R08: 0000000000000004 R09: 0000000000000020 R10: 0000000000000020 R11: 000000000000758b R12: ffff8880559b00f0 R13: ffff8880559b0128 R14: ffff8880559b0740 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880d5fdc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000033e4100 CR3: 0000000030cc7000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 85 6a 02 test %ebp,0x2(%rdx) 3: 00 00 add %al,(%rax) 5: 49 8b 45 00 mov 0x0(%r13),%rax 9: 48 89 44 24 18 mov %rax,0x18(%rsp) e: 48 05 30 07 00 00 add $0x730,%rax 14: 48 89 c2 mov %rax,%rdx 17: 48 89 44 24 20 mov %rax,0x20(%rsp) 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 74 08 je 0x3a 32: 3c 03 cmp $0x3,%al 34: 0f 8e b5 01 00 00 jle 0x1ef 3a: 48 8b 44 24 18 mov 0x18(%rsp),%rax 3f: 31 .byte 0x31 --- This report is generated by a bot. 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