linux-kernel - Re: [syzbot] [ext4?] WARNING in ext4_iomap

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Message-ID: <67242c5c.050a0220.529b6.005d.GAE@google.com>
Date: Thu, 31 Oct 2024 18:18:20 -0700
From: syzbot <syzbot+626aa13bf52efc3aa86e@...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: Re: [syzbot] [ext4?] WARNING in ext4_iomap_begin (3)

syzbot has found a reproducer for the following issue on:

HEAD commit:    0fc810ae3ae1 x86/uaccess: Avoid barrier_nospec() in 64-bit..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1684155f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=13742ac59dd3e298
dashboard link: https://syzkaller.appspot.com/bug?extid=626aa13bf52efc3aa86e
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=178a32a7980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16bc6630580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ce34c79f0f6a/disk-0fc810ae.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/873282a313a5/vmlinux-0fc810ae.xz
kernel image: https://storage.googleapis.com/syzbot-assets/027f191557a6/bzImage-0fc810ae.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/40461e1b126f/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+626aa13bf52efc3aa86e@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 5823 at fs/ext4/inode.c:3389 ext4_iomap_begin+0xaa2/0xd30 fs/ext4/inode.c:3389
Modules linked in:
CPU: 0 UID: 0 PID: 5823 Comm: syz-executor562 Not tainted 6.12.0-rc5-syzkaller-00063-g0fc810ae3ae1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:ext4_iomap_begin+0xaa2/0xd30 fs/ext4/inode.c:3389
Code: 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 48 f2 37 ff 49 be 00 00 00 00 00 fc ff df 48 8b 5c 24 48 e9 61 ff ff ff e8 2f f2 37 ff 90 <0f> 0b 90 41 bc de ff ff ff e9 87 f6 ff ff 89 d9 80 e1 07 38 c1 0f
RSP: 0018:ffffc90003ee7560 EFLAGS: 00010293
RAX: ffffffff825ce791 RBX: 0000000010000000 RCX: ffff888031505a00
RDX: 0000000000000000 RSI: 00000000000000d4 RDI: 0000000000000000
RBP: ffffc90003ee76d0 R08: ffffffff825cded8 R09: 1ffff1100f18b778
R10: dffffc0000000000 R11: ffffed100f18b779 R12: 00000000000000d4
R13: 1ffff1100f18b7dc R14: 000000000000000a R15: 0000000000000000
FS:  00007f00ef14c6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 0000000077f60000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 iomap_iter+0x691/0xf60 fs/iomap/iter.c:91
 __iomap_dio_rw+0xdea/0x2370 fs/iomap/direct-io.c:677
 iomap_dio_rw+0x46/0xa0 fs/iomap/direct-io.c:767
 ext4_dio_write_iter fs/ext4/file.c:577 [inline]
 ext4_file_write_iter+0x15f0/0x1a20 fs/ext4/file.c:696
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xaeb/0xd30 fs/read_write.c:683
 ksys_write+0x183/0x2b0 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00ef195cb9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f00ef14c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f00ef21e608 RCX: 00007f00ef195cb9
RDX: 0000000000001006 RSI: 0000000020006c00 RDI: 0000000000000004
RBP: 00007f00ef21e600 R08: 00007f00ef14c6c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f00ef21e60c
R13: 0000000000000006 R14: 00007ffee8483890 R15: 00007ffee8483978
 </TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.