syzbot


WARNING in __snd_rawmidi_transmit_ack

Status: fixed on 2018/08/07 13:43
Subsystems: sound
[Documentation on labels]
Reported-by: syzbot+52f83f0ea8df16932f7f@syzkaller.appspotmail.com
Fix commit: 39675f7a7c7e ALSA: rawmidi: Change resized buffers atomically
First crash: 2272d, last: 2272d
Discussions (7)
Title Replies (including bot) Last reply
[PATCH 3.16 00/63] 3.16.58-rc1 review 70 (71) 2018/09/22 21:03
[PATCH 4.4 000/107] 4.4.144-stable review 111 (111) 2018/09/17 11:53
[PATCH 3.18 00/27] 3.18.117-stable review 32 (32) 2018/07/27 20:25
[PATCH 4.17 00/63] 4.17.10-stable review 62 (62) 2018/07/25 19:19
[PATCH 4.14 00/44] 4.14.58-stable review 42 (42) 2018/07/24 15:58
[PATCH 4.9 00/28] 4.9.115-stable review 28 (28) 2018/07/24 15:57
WARNING in __snd_rawmidi_transmit_ack 0 (1) 2018/07/16 00:19
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __snd_rawmidi_transmit_ack (2) sound C 6 2234d 2242d 8/28 fixed on 2018/08/28 17:48

Sample crash report:
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: cc1: uninitialized urandom read (8 bytes read)
IPVS: ftp: loaded support on port[0] = 21
WARNING: CPU: 0 PID: 4608 at sound/core/rawmidi.c:1163 __snd_rawmidi_transmit_ack+0x263/0x2f0 sound/core/rawmidi.c:1163
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4608 Comm: syz-executor0 Not tainted 4.18.0-rc4+ #51
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+0x1c9/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:__snd_rawmidi_transmit_ack+0x263/0x2f0 sound/core/rawmidi.c:1163
Code: ba 01 00 00 00 be 03 00 00 00 e8 88 4a 83 fb e8 43 fe a2 fb 89 d8 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 2d fe a2 fb <0f> 0b e9 72 fe ff ff e8 e1 dc e0 fb e9 1b ff ff ff bb ea ff ff ff 
RSP: 0018:ffff8801abb8f720 EFLAGS: 00010093
RAX: ffff8801d8b500c0 RBX: 0000000000000002 RCX: ffffffff85d90b82
RDX: 0000000000000000 RSI: ffffffff85d90d13 RDI: 0000000000000006
RBP: ffff8801abb8f760 R08: ffff8801d8b500c0 R09: ffffed003b128cb4
R10: ffffed003b128cb4 R11: ffff8801d89465a3 R12: ffff8801cd646240
R13: 0000000000000802 R14: 0000000000000002 R15: ffff8801ab48e5c0
 snd_virmidi_output_trigger+0x3ae/0x6b0 sound/core/seq/seq_virmidi.c:194
 snd_rawmidi_output_trigger sound/core/rawmidi.c:150 [inline]
 snd_rawmidi_kernel_write1+0x519/0x700 sound/core/rawmidi.c:1288
 snd_rawmidi_write+0x2ea/0xde0 sound/core/rawmidi.c:1338
 __vfs_write+0x117/0x9f0 fs/read_write.c:485
 vfs_write+0x1f8/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __ia32_sys_write+0x71/0xb0 fs/read_write.c:607
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f5fcb9
Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 
RSP: 002b:00000000f7f190ac EFLAGS: 00000282 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000200000c0
RDX: 000000000000ff4c RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/15 19:51 upstream 37b5dca2898d 92a49505 .config console log report syz ci-upstream-kasan-gce-386
2018/07/15 19:34 upstream 37b5dca2898d 92a49505 .config console log report ci-upstream-kasan-gce-386
* Struck through repros no longer work on HEAD.