Hello, syzbot found the following crash on: HEAD commit: 1ee08de1 Merge tag 'for-5.8/io_uring-2020-06-01' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1132dfe2100000 kernel config: https://syzkaller.appspot.com/x/.config?x=764b977f857603f1 dashboard link: https://syzkaller.appspot.com/bug?extid=0f4ecfe6a2c322c81728 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12aa59ce100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1701eb91100000 The bug was bisected to: commit f2c2e717642c66f7fe7e5dd69b2e8ff5849f4d10 Author: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Date: Mon Feb 24 16:13:03 2020 +0000 usb: gadget: add raw-gadget interface bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=171c33ee100000 final crash: https://syzkaller.appspot.com/x/report.txt?x=149c33ee100000 console output: https://syzkaller.appspot.com/x/log.txt?x=109c33ee100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0f4ecfe6a2c322c81728@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: f2c2e717642c ("usb: gadget: add raw-gadget interface") ------------[ cut here ]------------ URB 00000000bfcadc71 submitted while active WARNING: CPU: 0 PID: 8955 at drivers/usb/core/urb.c:363 usb_submit_urb+0xe3d/0x13e0 drivers/usb/core/urb.c:363 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8955 Comm: syz-executor958 Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1e9/0x30e lib/dump_stack.c:118 panic+0x264/0x7a0 kernel/panic.c:221 __warn+0x209/0x210 kernel/panic.c:582 report_bug+0x1ac/0x2d0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:105 [inline] do_error_trap+0xca/0x1c0 arch/x86/kernel/traps.c:197 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:216 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:usb_submit_urb+0xe3d/0x13e0 drivers/usb/core/urb.c:363 Code: 00 04 00 00 eb 50 e8 82 20 3e fc eb 49 e8 7b 20 3e fc c6 05 c8 a5 32 04 01 48 c7 c7 30 02 fe 88 4c 89 ee 31 c0 e8 13 10 10 fc <0f> 0b e9 38 f2 ff ff e8 57 20 3e fc c7 04 24 80 00 00 00 eb 17 e8 RSP: 0018:ffffc90007c072e8 EFLAGS: 00010246 RAX: f3c090533e8e2b00 RBX: ffff88809ff85b08 RCX: ffff8880a84e6400 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 0000000000000cc0 R08: ffffffff815cbfb9 R09: ffffed1015d06660 R10: ffffed1015d06660 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88809ff85b00 R14: dffffc0000000000 R15: ffff8880924c0000 snd_usbmidi_submit_urb sound/usb/midi.c:194 [inline] snd_usbmidi_input_start_ep sound/usb/midi.c:2313 [inline] snd_usbmidi_input_start+0x15f/0x7a0 sound/usb/midi.c:2329 substream_open+0x22b/0x6e0 sound/usb/midi.c:1119 open_substream+0x369/0x6a0 sound/core/rawmidi.c:299 rawmidi_open_priv+0x99/0x900 sound/core/rawmidi.c:342 snd_rawmidi_kernel_open+0x1db/0x270 sound/core/rawmidi.c:382 midisynth_subscribe+0x93/0x280 sound/core/seq/seq_midi.c:170 subscribe_port sound/core/seq/seq_ports.c:412 [inline] check_and_subscribe_port+0x62c/0xb10 sound/core/seq/seq_ports.c:495 snd_seq_port_connect+0x20f/0x460 sound/core/seq/seq_ports.c:564 snd_seq_ioctl_subscribe_port+0x349/0x6c0 sound/core/seq/seq_clientmgr.c:1484 snd_seq_oss_midi_open+0x4db/0x830 sound/core/seq/oss/seq_oss_midi.c:364 snd_seq_oss_synth_setup_midi+0x108/0x510 sound/core/seq/oss/seq_oss_synth.c:269 snd_seq_oss_open+0x899/0xe90 sound/core/seq/oss/seq_oss_init.c:261 odev_open+0x5e/0x90 sound/core/seq/oss/seq_oss.c:125 chrdev_open+0x498/0x580 fs/char_dev.c:414 do_dentry_open+0x808/0x1020 fs/open.c:828 do_open fs/namei.c:3229 [inline] path_openat+0x2790/0x38b0 fs/namei.c:3346 do_filp_open+0x191/0x3a0 fs/namei.c:3373 do_sys_openat2+0x463/0x770 fs/open.c:1179 do_sys_open fs/open.c:1195 [inline] __do_sys_openat fs/open.c:1209 [inline] __se_sys_openat fs/open.c:1204 [inline] __x64_sys_openat+0x1c8/0x1f0 fs/open.c:1204 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x445719 Code: e8 8c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff79d9b7c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445719 RDX: 0000000000000000 RSI: 0000000020000280 RDI: ffffffffffffff9c RBP: 000000000008b2e3 R08: 0000000000000000 R09: 00000000004002e0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402890 R13: 0000000000402920 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
