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Message-ID: <00000000000050776d05c9b7c7f0@google.com>
Date: Mon, 16 Aug 2021 19:07:23 -0700
From: syzbot <syzbot+67654e51e54455f1c585@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
mike.kravetz@...cle.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] kernel BUG in remove_inode_hugepages
Hello,
syzbot found the following issue on:
HEAD commit: a2824f19e606 Merge tag 'mtd/fixes-for-5.14-rc7' of git://g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=110d54ee300000
kernel config: https://syzkaller.appspot.com/x/.config?x=96f0602203250753
dashboard link: https://syzkaller.appspot.com/bug?extid=67654e51e54455f1c585
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=12eeb6a6300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13515779300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+67654e51e54455f1c585@...kaller.appspotmail.com
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:00007ffedef26928 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000043f589
RDX: 000000000000effd RSI: 0000000020000680 RDI: 0000000000000003
RBP: 00007ffedef26930 R08: 0000000000000001 R09: 0000000000400034
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000000 R14: 00000000004ad018 R15: 0000000000400488
------------[ cut here ]------------
kernel BUG at fs/hugetlbfs/inode.c:532!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8445 Comm: syz-executor211 Not tainted 5.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:remove_inode_hugepages+0x52f/0xa90 fs/hugetlbfs/inode.c:532
Code: ff e8 d5 f2 4c ff 48 89 ef e8 3d c3 70 ff e9 17 ff ff ff e8 c3 f2 4c ff 48 89 ef e8 cb 50 71 ff e9 1a fe ff ff e8 b1 f2 4c ff <0f> 0b e8 aa f2 4c ff 49 83 ed 01 e9 d5 fd ff ff e8 9c f2 4c ff 48
RSP: 0018:ffffc900017afa30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888017093880 RSI: ffffffff8228b64f RDI: 0000000000000003
RBP: ffffea0000a48000 R08: 0000000000000000 R09: ffffea0000a4802f
R10: ffffffff8228b4a7 R11: 0000000000000000 R12: 7fffffffffffffff
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004801c0 CR3: 0000000029917000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
hugetlbfs_evict_inode+0x1f/0x70 fs/hugetlbfs/inode.c:557
evict+0x2ed/0x6b0 fs/inode.c:584
iput_final fs/inode.c:1660 [inline]
iput.part.0+0x539/0x850 fs/inode.c:1686
iput+0x58/0x70 fs/inode.c:1676
dentry_unlink_inode+0x2b1/0x3d0 fs/dcache.c:376
__dentry_kill+0x3c0/0x640 fs/dcache.c:582
dentry_kill fs/dcache.c:708 [inline]
dput+0x73a/0xbc0 fs/dcache.c:888
__fput+0x3ae/0x920 fs/file_table.c:293
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
exit_task_work include/linux/task_work.h:32 [inline]
do_exit+0xbd4/0x2a60 kernel/exit.c:825
do_group_exit+0x125/0x310 kernel/exit.c:922
__do_sys_exit_group kernel/exit.c:933 [inline]
__se_sys_exit_group kernel/exit.c:931 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
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: 0033:0x43e289
Code: Unable to access opcode bytes at RIP 0x43e25f.
RSP: 002b:00007ffedef26908 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00000000004af3b0 RCX: 000000000043e289
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000400034
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004af3b0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
Modules linked in:
---[ end trace b9c8e89a63f407f9 ]---
RIP: 0010:remove_inode_hugepages+0x52f/0xa90 fs/hugetlbfs/inode.c:532
Code: ff e8 d5 f2 4c ff 48 89 ef e8 3d c3 70 ff e9 17 ff ff ff e8 c3 f2 4c ff 48 89 ef e8 cb 50 71 ff e9 1a fe ff ff e8 b1 f2 4c ff <0f> 0b e8 aa f2 4c ff 49 83 ed 01 e9 d5 fd ff ff e8 9c f2 4c ff 48
RSP: 0018:ffffc900017afa30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888017093880 RSI: ffffffff8228b64f RDI: 0000000000000003
RBP: ffffea0000a48000 R08: 0000000000000000 R09: ffffea0000a4802f
R10: ffffffff8228b4a7 R11: 0000000000000000 R12: 7fffffffffffffff
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004801c0 CR3: 0000000029917000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 28 c3 sub %al,%bl
2: e8 2a 14 00 00 callq 0x1431
7: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
e: 00 00 00
11: 48 89 f8 mov %rdi,%rax
14: 48 89 f7 mov %rsi,%rdi
17: 48 89 d6 mov %rdx,%rsi
1a: 48 89 ca mov %rcx,%rdx
1d: 4d 89 c2 mov %r8,%r10
20: 4d 89 c8 mov %r9,%r8
23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9
28: 0f 05 syscall
2a: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction
30: 73 01 jae 0x33
32: c3 retq
33: 48 c7 c1 c0 ff ff ff mov $0xffffffffffffffc0,%rcx
3a: f7 d8 neg %eax
3c: 64 89 01 mov %eax,%fs:(%rcx)
3f: 48 rex.W
---
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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