Hello,
syzbot hit the following crash on upstream commit b284d4d5a6785f8cd07eda2646a95782373cd01e (Tue Apr 10 19:25:30 2018 +0000) Merge tag 'ceph-for-4.17-rc1' of git://github.com/ceph/ceph-client syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=f7a0348affc3b67bc617
Unfortunately, I don't have any reproducer for this crash yet. Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5208906934517760 Kernel config: https://syzkaller.appspot.com/x/.config?id=-1223000601505858474 compiler: gcc (GCC) 8.0.1 20180301 (experimental)
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kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 21671 Comm: syz-executor7 Not tainted 4.16.0+ #17 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:snd_rawmidi_ioctl_status_x32 sound/core/rawmidi_compat.c:125 [inline] RIP: 0010:snd_rawmidi_ioctl_compat+0x51d/0xba0 sound/core/rawmidi_compat.c:168 RSP: 0018:ffff88018ccdfc08 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900054cb000 RDX: 000000000000000b RSI: ffffffff85a61885 RDI: 0000000000000058 RBP: ffff88018ccdfd80 R08: ffff8801af6f0740 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000000 R12: 1ffff1003199bf83 R13: 0000000000930000 R14: ffff88018ccdfcf8 R15: 0000000000000001 FS: 00007fa64d466700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa30835b518 CR3: 00000001879ef000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: C_SYSC_ioctl fs/compat_ioctl.c:1461 [inline] compat_SyS_ioctl+0xa37/0x33b0 fs/compat_ioctl.c:1407 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x455259 RSP: 002b:00007fa64d465c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000202 RAX: ffffffffffffffda RBX: 00007fa64d4666d4 RCX: 0000000000455259 RDX: 0000000000930000 RSI: 00000000c0305720 RDI: 0000000000000013 RBP: 000000000072bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000180 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000641 R14: 00000000006fc6b8 R15: 0000000000000001 Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 1c 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 08 48 8d 7b 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e5 05 00 00 48 8b 7b 58 4c 89 f6 e8 5d cc ff RIP: snd_rawmidi_ioctl_status_x32 sound/core/rawmidi_compat.c:125 [inline] RSP: ffff88018ccdfc08 RIP: snd_rawmidi_ioctl_compat+0x51d/0xba0 sound/core/rawmidi_compat.c:168 RSP: ffff88018ccdfc08 ---[ end trace 7dcd43c411f49842 ]---
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