* [syzbot] [usb?] general protection fault in f_midi2_free_ep_reqs
@ 2026-07-28 13:52 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2026-07-28 13:52 UTC (permalink / raw)
To: gregkh, linux-kernel, linux-usb, syzkaller-bugs
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:
<IRQ>
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
</IRQ>
<TASK>
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 <bf> 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
</TASK>
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
---
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2026-07-28 13:52 [syzbot] [usb?] general protection fault in f_midi2_free_ep_reqs syzbot
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