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Message-ID: <000000000000c70eef05d39f42a5@google.com>
Date: Mon, 20 Dec 2021 19:04:17 -0800
From: syzbot <syzbot+8836466a79f4175961b0@...kaller.appspotmail.com>
To: axboe@...nel.dk, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] general protection fault in set_task_ioprio
Hello,
syzbot found the following issue on:
HEAD commit: 07f8c60fe60f Add linux-next specific files for 20211220
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1355d295b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=2060504830b9124a
dashboard link: https://syzkaller.appspot.com/bug?extid=8836466a79f4175961b0
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12058fcbb00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17141adbb00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8836466a79f4175961b0@...kaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 3602 Comm: syz-executor484 Not tainted 5.16.0-rc5-next-20211220-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:set_task_ioprio+0x2de/0x620 block/blk-ioc.c:289 block/blk-ioc.c:289
Code: 4c 8b ab 18 12 00 00 4d 85 ed 0f 84 9b 01 00 00 e8 d7 1e a4 fd 49 8d 7d 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 ef
RSP: 0018:ffffc90001b1fe90 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: ffff88801f888000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83d3f779 RDI: 000000000000000c
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ffaf957
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88801f888948 R15: ffff88801f889218
FS: 0000555556a34300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2155cab01d CR3: 00000000149ed000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__do_sys_ioprio_set+0x586/0xae0 block/ioprio.c:124 block/ioprio.c:124
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f2155c67cf9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc6f0f50c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000fb
RAX: ffffffffffffffda RBX: 000000000000cbcf RCX: 00007f2155c67cf9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc6f0f5268 R09: 00007ffc6f0f5268
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007ffc6f0f50dc
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:set_task_ioprio+0x2de/0x620 block/blk-ioc.c:289 block/blk-ioc.c:289
Code: 4c 8b ab 18 12 00 00 4d 85 ed 0f 84 9b 01 00 00 e8 d7 1e a4 fd 49 8d 7d 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 ef
RSP: 0018:ffffc90001b1fe90 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: ffff88801f888000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83d3f779 RDI: 000000000000000c
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ffaf957
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88801f888948 R15: ffff88801f889218
FS: 0000555556a34300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2155cab01d CR3: 00000000149ed000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 4c 8b ab 18 12 00 00 mov 0x1218(%rbx),%r13
7: 4d 85 ed test %r13,%r13
a: 0f 84 9b 01 00 00 je 0x1ab
10: e8 d7 1e a4 fd callq 0xfda41eec
15: 49 8d 7d 0c lea 0xc(%r13),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction
2e: 48 89 f8 mov %rdi,%rax
31: 83 e0 07 and $0x7,%eax
34: 83 c0 01 add $0x1,%eax
37: 38 d0 cmp %dl,%al
39: 7c 08 jl 0x43
3b: 84 d2 test %dl,%dl
3d: 0f .byte 0xf
3e: 85 ef test %ebp,%edi
----------------
Code disassembly (best guess):
0: 4c 8b ab 18 12 00 00 mov 0x1218(%rbx),%r13
7: 4d 85 ed test %r13,%r13
a: 0f 84 9b 01 00 00 je 0x1ab
10: e8 d7 1e a4 fd callq 0xfda41eec
15: 49 8d 7d 0c lea 0xc(%r13),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction
2e: 48 89 f8 mov %rdi,%rax
31: 83 e0 07 and $0x7,%eax
34: 83 c0 01 add $0x1,%eax
37: 38 d0 cmp %dl,%al
39: 7c 08 jl 0x43
3b: 84 d2 test %dl,%dl
3d: 0f .byte 0xf
3e: 85 ef test %ebp,%edi
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
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