linux-ext4 - WARNING in ext4_xattr_set

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Date:   Sat, 12 Dec 2020 06:13:10 -0800
From:   syzbot <syzbot+98b881fdd8ebf45ab4ae@...kaller.appspotmail.com>
To:     adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tytso@....edu
Subject: WARNING in ext4_xattr_set_entry

Hello,

syzbot found the following issue on:

HEAD commit:    cd796ed3 Merge tag 'trace-v5.10-rc7' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14721287500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e597c2b53c984cd8
dashboard link: https://syzkaller.appspot.com/bug?extid=98b881fdd8ebf45ab4ae
compiler:       clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17f0f703500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13307137500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+98b881fdd8ebf45ab4ae@...kaller.appspotmail.com

EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
ext4 filesystem being mounted at /root/file0 supports timestamps until 2038 (0x7fffffff)
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8454 at fs/ext4/xattr.c:1640 ext4_xattr_set_entry+0x30d0/0x3860 fs/ext4/xattr.c:1640
Modules linked in:
CPU: 1 PID: 8454 Comm: syz-executor801 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ext4_xattr_set_entry+0x30d0/0x3860 fs/ext4/xattr.c:1640
Code: ff ff ff eb 05 e8 20 ad 5c ff 49 bd 00 00 00 00 00 fc ff df 48 8b 1c 24 48 8b ac 24 90 00 00 00 e9 b9 fd ff ff e8 00 ad 5c ff <0f> 0b e9 a1 d6 ff ff 48 8b 7c 24 78 4c 89 e6 e8 5c 81 c8 ff 49 8d
RSP: 0018:ffffc9000142f718 EFLAGS: 00010293
RAX: ffffffff82187230 RBX: 0000000000000000 RCX: ffff88801abc1a40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff92000285f5d R08: ffffffff821848ca R09: ffffffff89600dd0
R10: ffffffff89800000 R11: ffffffff898006be R12: 0000000000000001
R13: dffffc0000000000 R14: ffffc9000142fae8 R15: ffff8880291d9020
FS:  000000000151a880(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560573deec1e CR3: 00000000117d2000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_xattr_block_set+0x386/0x3c50 fs/ext4/xattr.c:1942
 ext4_xattr_set_handle+0xead/0x1ed0 fs/ext4/xattr.c:2390
 ext4_xattr_set+0x1d8/0x310 fs/ext4/xattr.c:2491
 __vfs_setxattr+0x3be/0x400 fs/xattr.c:177
 __vfs_setxattr_noperm+0x11e/0x4b0 fs/xattr.c:208
 vfs_setxattr+0xde/0x270 fs/xattr.c:283
 setxattr+0x167/0x340 fs/xattr.c:548
 path_setxattr+0x109/0x1c0 fs/xattr.c:567
 __do_sys_lsetxattr fs/xattr.c:589 [inline]
 __se_sys_lsetxattr fs/xattr.c:585 [inline]
 __x64_sys_lsetxattr+0xb4/0xd0 fs/xattr.c:585
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4445a9
Code: 8d d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 5b d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd1c974678 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00000000004445a9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000020000140
RBP: 00000000006cf018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190
R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000


---
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