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Date:   Sun, 17 May 2020 20:12:19 -0700
From:   syzbot <syzbot+8672dcb9d10011c0a160@...kaller.appspotmail.com>
To:     axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        rostedt@...dmis.org, syzkaller-bugs@...glegroups.com
Subject: WARNING in get_probe_ref

Hello,

syzbot found the following crash on:

HEAD commit:    24085f70 Merge tag 'trace-v5.7-rc4' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=117087fa100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=efdde85c3af536b5
dashboard link: https://syzkaller.appspot.com/bug?extid=8672dcb9d10011c0a160
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=101c09dc100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=178fa32c100000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+8672dcb9d10011c0a160@...kaller.appspotmail.com

RBP: 0000000000000006 R08: 0000000000000002 R09: 0000000002003033
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402f60
R13: 0000000000402ff0 R14: 0000000000000000 R15: 0000000000000000
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7052 at kernel/trace/blktrace.c:1115 blk_register_tracepoints kernel/trace/blktrace.c:1115 [inline]
WARNING: CPU: 0 PID: 7052 at kernel/trace/blktrace.c:1115 get_probe_ref+0x327/0x3e0 kernel/trace/blktrace.c:324
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 7052 Comm: syz-executor149 Not tainted 5.7.0-rc5-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+0x188/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x35 kernel/panic.c:582
 report_bug+0x27b/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:175 [inline]
 fixup_bug arch/x86/kernel/traps.c:170 [inline]
 do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267
 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:blk_register_tracepoints kernel/trace/blktrace.c:1115 [inline]
RIP: 0010:get_probe_ref+0x327/0x3e0 kernel/trace/blktrace.c:324
Code: 8a e8 3d d3 fb ff 31 ff 89 c3 89 c6 e8 62 56 fa ff 85 db 0f 84 1e fd ff ff e8 e5 54 fa ff 0f 0b e9 12 fd ff ff e8 d9 54 fa ff <0f> 0b e9 45 fd ff ff e8 cd 54 fa ff 0f 0b e9 66 fd ff ff e8 c1 54
RSP: 0018:ffffc900016a7b88 EFLAGS: 00010293
RAX: ffff8880953ba600 RBX: 00000000fffffff4 RCX: ffffffff8178dbdb
RDX: 0000000000000000 RSI: ffffffff8178de97 RDI: 0000000000000005
RBP: ffff8880a4640700 R08: ffff8880953ba600 R09: fffffbfff133f1c1
R10: ffffffff899f8e07 R11: fffffbfff133f1c0 R12: ffff8880a019d100
R13: ffff888089d24a10 R14: 0000000000000000 R15: ffff8880a4640730
 do_blk_trace_setup+0x7d3/0xb30 kernel/trace/blktrace.c:550
 __blk_trace_setup+0xca/0x180 kernel/trace/blktrace.c:571
 blk_trace_setup+0x43/0x60 kernel/trace/blktrace.c:589
 sg_ioctl_common+0x2f8/0x2720 drivers/scsi/sg.c:1120
 sg_ioctl+0x8f/0x120 drivers/scsi/sg.c:1163
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:771
 __do_sys_ioctl fs/ioctl.c:780 [inline]
 __se_sys_ioctl fs/ioctl.c:778 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x445ca9
Code: e8 ac 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 2b ce fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff1c9ef988 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fff1c9ef990 RCX: 0000000000445ca9
RDX: 0000000020000140 RSI: 00000000c0481273 RDI: 0000000000000004
RBP: 0000000000000006 R08: 0000000000000002 R09: 0000000002003033
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402f60
R13: 0000000000402ff0 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@...glegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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