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Message-ID: <000000000000c7c18505ce93467e@google.com>
Date: Sun, 17 Oct 2021 14:40:26 -0700
From: syzbot <syzbot+005b78d4c45263d656dd@...kaller.appspotmail.com>
To: axboe@...nel.dk, hch@....de, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] general protection fault in hctx_lock
Hello,
syzbot found the following issue on:
HEAD commit: 7c832d2f9b95 Add linux-next specific files for 20211015
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10e9df10b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=f6ac42766a768877
dashboard link: https://syzkaller.appspot.com/bug?extid=005b78d4c45263d656dd
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=1154f80cb00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1750eeecb00000
The issue was bisected to:
commit f328476e373a7ce4b4d16c48fe85571044e025f5
Author: Christoph Hellwig <hch@....de>
Date: Tue Oct 12 10:40:45 2021 +0000
blk-mq: cleanup blk_mq_submit_bio
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11b6a078b00000
final oops: https://syzkaller.appspot.com/x/report.txt?x=13b6a078b00000
console output: https://syzkaller.appspot.com/x/log.txt?x=15b6a078b00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+005b78d4c45263d656dd@...kaller.appspotmail.com
Fixes: f328476e373a ("blk-mq: cleanup blk_mq_submit_bio")
loop7: detected capacity change from 0 to 1036
general protection fault, probably for non-canonical address 0xdffffc0000000027: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000138-0x000000000000013f]
CPU: 0 PID: 7029 Comm: syz-executor121 Not tainted 5.15.0-rc5-next-20211015-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:hctx_lock+0x29/0x1d0 block/blk-mq.c:780
Code: 00 41 55 41 54 49 89 f4 55 53 48 89 fb e8 1f 16 b3 fd 48 8d bb 38 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 8a 01 00 00 48 8b ab 38 01 00 00 31 ff 83 e5 20
RSP: 0018:ffffc9000319f0c8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000027 RSI: ffffffff83c44e71 RDI: 0000000000000138
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc9000319f110
R13: 0000000000000001 R14: 0000000000000148 R15: ffffc9000319f570
FS: 00007fca2d18e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca2d232e88 CR3: 00000000705ed000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
blk_mq_run_hw_queue+0x79/0x2f0 block/blk-mq.c:1697
blk_mq_submit_bio+0x136b/0x1920 block/blk-mq.c:2316
__submit_bio_noacct_mq block/blk-core.c:997 [inline]
submit_bio_noacct block/blk-core.c:1026 [inline]
submit_bio_noacct+0xa26/0xee0 block/blk-core.c:1012
submit_bio block/blk-core.c:1087 [inline]
submit_bio+0x1ea/0x470 block/blk-core.c:1045
submit_bio_wait+0x106/0x230 block/bio.c:1266
blkdev_issue_flush+0xd6/0x130 block/blk-flush.c:458
blkdev_fsync+0x68/0xa0 block/fops.c:401
vfs_fsync_range+0x13a/0x220 fs/sync.c:200
generic_write_sync include/linux/fs.h:2951 [inline]
blkdev_write_iter+0x3d8/0x540 block/fops.c:486
call_write_iter include/linux/fs.h:2159 [inline]
do_iter_readv_writev+0x472/0x750 fs/read_write.c:729
do_iter_write+0x188/0x710 fs/read_write.c:855
vfs_iter_write+0x70/0xa0 fs/read_write.c:896
iter_file_splice_write+0x723/0xc70 fs/splice.c:689
do_splice_from fs/splice.c:767 [inline]
direct_splice_actor+0x110/0x180 fs/splice.c:936
splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891
do_splice_direct+0x1b3/0x280 fs/splice.c:979
do_sendfile+0xaf2/0x1250 fs/read_write.c:1249
__do_sys_sendfile64 fs/read_write.c:1314 [inline]
__se_sys_sendfile64 fs/read_write.c:1300 [inline]
__x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1300
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fca2d1e96d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 31 18 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fca2d18e2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fca2d2664a0 RCX: 00007fca2d1e96d9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 00007fca2d2664ac R08: 0000000000000000 R09: 0000000000000000
R10: 0000000024002da8 R11: 0000000000000246 R12: 00007fca2d2332c4
R13: 6f6f6c2f7665642f R14: 0000002a1a885446 R15: 00007fca2d2664a8
</TASK>
Modules linked in:
---[ end trace 20f37bd14883795d ]---
RIP: 0010:hctx_lock+0x29/0x1d0 block/blk-mq.c:780
Code: 00 41 55 41 54 49 89 f4 55 53 48 89 fb e8 1f 16 b3 fd 48 8d bb 38 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 8a 01 00 00 48 8b ab 38 01 00 00 31 ff 83 e5 20
RSP: 0018:ffffc9000319f0c8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000027 RSI: ffffffff83c44e71 RDI: 0000000000000138
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc9000319f110
R13: 0000000000000001 R14: 0000000000000148 R15: ffffc9000319f570
FS: 00007fca2d18e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca2d232e88 CR3: 00000000705ed000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 41 55 add %al,0x55(%rcx)
3: 41 54 push %r12
5: 49 89 f4 mov %rsi,%r12
8: 55 push %rbp
9: 53 push %rbx
a: 48 89 fb mov %rdi,%rbx
d: e8 1f 16 b3 fd callq 0xfdb31631
12: 48 8d bb 38 01 00 00 lea 0x138(%rbx),%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: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 8a 01 00 00 jne 0x1be
34: 48 8b ab 38 01 00 00 mov 0x138(%rbx),%rbp
3b: 31 ff xor %edi,%edi
3d: 83 e5 20 and $0x20,%ebp
---
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.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
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