syzbot
WARNING in ttusb_start_feed/usb_submit_urb
Status:
upstream: reported C repro on 2026/09/18 16:57
Subsystems:
media
usb
Labels:
prio:high
[Documentation on labels]
Reported-by: syzbot+3caf6a60e5f9be12de08@syzkaller.appspotmail.com
First crash: 14h27m, last: 12h19m
Sample crash report:
usb 1-1: BOGUS urb xfer, pipe 0 != type 1
------------[ cut here ]------------
usb 1-1: BOGUS urb flags, 202 --> 200
WARNING: drivers/usb/core/urb.c:533 at usb_submit_urb+0xc9d/0x18b0 drivers/usb/core/urb.c:532, CPU#0: syz.0.17/5838
Modules linked in:
CPU: 0 UID: 0 PID: 5838 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:usb_submit_urb+0xd28/0x18b0 drivers/usb/core/urb.c:532
Code: e8 7d 79 c9 fa 4c 89 f7 4d 8b 6d 00 41 0f b6 04 2c 84 c0 48 8b 54 24 18 0f 85 97 07 00 00 8b 0a 48 8b 34 24 4c 89 ea 45 89 f8 <67> 48 0f b9 3a 4c 8b 6c 24 08 4c 89 ef 48 c7 c6 80 2b b0 8f e8 9f
RSP: 0018:ffffc9000395f918 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8880308f2000 RCX: 0000000000000202
RDX: ffff88807e689280 RSI: ffffffff8cc51f20 RDI: ffffffff9087dfb0
RBP: dffffc0000000000 R08: 0000000000000200 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: 1ffff1100611e40b
R13: ffff88807e689280 R14: ffff888031bba100 R15: 0000000000000200
FS: 0000000000000000(0000) GS:ffff888124cd2000(0063) knlGS:0000000057d95480
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000055af9ae48058 CR3: 0000000078e3c000 CR4: 00000000003526f0
Call Trace:
<TASK>
ttusb_start_iso_xfer drivers/media/usb/ttusb-budget/dvb-ttusb-budget.c:829 [inline]
ttusb_start_feed+0xe19/0x1770 drivers/media/usb/ttusb-budget/dvb-ttusb-budget.c:899
dmx_ts_feed_start_filtering+0x129/0x220 drivers/media/dvb-core/dvb_demux.c:747
dvb_dmxdev_start_feed drivers/media/dvb-core/dmxdev.c:658 [inline]
dvb_dmxdev_filter_start+0x434/0x10d0 drivers/media/dvb-core/dmxdev.c:769
dvb_demux_do_ioctl+0x48b/0x540 drivers/media/dvb-core/dmxdev.c:1099
dvb_usercopy+0x199/0x2e0 drivers/media/dvb-core/dvbdev.c:996
dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1208
__do_compat_sys_ioctl fs/ioctl.c:695 [inline]
__se_compat_sys_ioctl fs/ioctl.c:638 [inline]
__ia32_compat_sys_ioctl+0x5ea/0x950 fs/ioctl.c:638
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
__do_fast_syscall_32+0x27a/0x6a0 arch/x86/entry/syscall_32.c:291
do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:316
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf706f0ec
Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8
RSP: 002b:00000000ffb07a2c EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000040146f2c
RDX: 0000000080000300 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess):
0: e8 7d 79 c9 fa call 0xfac97982
5: 4c 89 f7 mov %r14,%rdi
8: 4d 8b 6d 00 mov 0x0(%r13),%r13
c: 41 0f b6 04 2c movzbl (%r12,%rbp,1),%eax
11: 84 c0 test %al,%al
13: 48 8b 54 24 18 mov 0x18(%rsp),%rdx
18: 0f 85 97 07 00 00 jne 0x7b5
1e: 8b 0a mov (%rdx),%ecx
20: 48 8b 34 24 mov (%rsp),%rsi
24: 4c 89 ea mov %r13,%rdx
27: 45 89 f8 mov %r15d,%r8d
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 4c 8b 6c 24 08 mov 0x8(%rsp),%r13
34: 4c 89 ef mov %r13,%rdi
37: 48 c7 c6 80 2b b0 8f mov $0xffffffff8fb02b80,%rsi
3e: e8 .byte 0xe8
3f: 9f lahf
* Struck through repros no longer work on HEAD.