From: syzbot <syzbot+2b85e9379c34945fe38f@syzkaller.appspotmail.com>
To: asml.silence@gmail.com, axboe@kernel.dk,
io-uring@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] general protection fault in __io_queue_sqe
Date: Mon, 16 Aug 2021 14:41:24 -0700 [thread overview]
Message-ID: <00000000000011fc2505c9b41023@google.com> (raw)
In-Reply-To: <00000000000020339705c9ad30ee@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: b9011c7e671d Add linux-next specific files for 20210816
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1784d5e9300000
kernel config: https://syzkaller.appspot.com/x/.config?x=a245d1aa4f055cc1
dashboard link: https://syzkaller.appspot.com/bug?extid=2b85e9379c34945fe38f
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17479216300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=147f0111300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2b85e9379c34945fe38f@syzkaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
CPU: 0 PID: 6542 Comm: syz-executor423 Not tainted 5.14.0-rc5-next-20210816-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__io_req_set_refcount fs/io_uring.c:1152 [inline]
RIP: 0010:__io_prep_linked_timeout fs/io_uring.c:1348 [inline]
RIP: 0010:io_prep_linked_timeout fs/io_uring.c:1356 [inline]
RIP: 0010:__io_queue_sqe+0x278/0xeb0 fs/io_uring.c:6708
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 07 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 70 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 3e 0b 00 00 45 8b 74 24 58 31
RSP: 0018:ffffc90002e4fd48 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 1ffff920005c9fb0 RCX: 0000000000000000
RDX: 000000000000000b RSI: ffffffff81e1bcbf RDI: 0000000000000058
RBP: ffff88807afc6280 R08: 0000000000000001 R09: ffff88807afc62df
R10: ffffed100f5f8c5b R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88807afc62f0 R15: ffff88807afc62f0
FS: 000000000169a300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200002c4 CR3: 0000000072b0d000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
io_req_task_submit+0xaa/0x120 fs/io_uring.c:2139
tctx_task_work+0x106/0x540 fs/io_uring.c:2063
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_signal include/linux/tracehook.h:212 [inline]
handle_signal_work kernel/entry/common.c:146 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x256/0x290 kernel/entry/common.c:209
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x43f169
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe2bd862a8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 0000000000000200 RBX: 00000000004ad018 RCX: 000000000043f169
RDX: 0000000000000000 RSI: 00000000000045f5 RDI: 0000000000000003
RBP: 0000000000403150 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004031e0
R13: 0000000000000000 R14: 00000000004ad018 R15: 0000000000400488
Modules linked in:
---[ end trace bbf4e48f02e6cc2c ]---
RIP: 0010:__io_req_set_refcount fs/io_uring.c:1152 [inline]
RIP: 0010:__io_prep_linked_timeout fs/io_uring.c:1348 [inline]
RIP: 0010:io_prep_linked_timeout fs/io_uring.c:1356 [inline]
RIP: 0010:__io_queue_sqe+0x278/0xeb0 fs/io_uring.c:6708
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 07 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 70 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 3e 0b 00 00 45 8b 74 24 58 31
RSP: 0018:ffffc90002e4fd48 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 1ffff920005c9fb0 RCX: 0000000000000000
RDX: 000000000000000b RSI: ffffffff81e1bcbf RDI: 0000000000000058
RBP: ffff88807afc6280 R08: 0000000000000001 R09: ffff88807afc62df
R10: ffffed100f5f8c5b R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88807afc62f0 R15: ffff88807afc62f0
FS: 000000000169a300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200002c4 CR3: 0000000072b0d000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 89 fa mov %edi,%edx
2: 48 c1 ea 03 shr $0x3,%rdx
6: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
a: 0f 85 07 0c 00 00 jne 0xc17
10: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
17: fc ff df
1a: 4c 8b 65 70 mov 0x70(%rbp),%r12
1e: 49 8d 7c 24 58 lea 0x58(%r12),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 74 08 je 0x3a
32: 3c 03 cmp $0x3,%al
34: 0f 8e 3e 0b 00 00 jle 0xb78
3a: 45 8b 74 24 58 mov 0x58(%r12),%r14d
3f: 31 .byte 0x31
next prev parent reply other threads:[~2021-08-16 21:41 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-16 13:29 [syzbot] general protection fault in __io_queue_sqe syzbot
2021-08-16 21:41 ` syzbot [this message]
2021-08-16 21:49 ` Jens Axboe
2021-08-16 21:57 ` Jens Axboe
2021-08-16 22:50 ` Pavel Begunkov
2021-08-17 3:50 ` syzbot
2021-08-17 3:33 ` syzbot
2021-08-17 8:19 ` syzbot
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