linux-kernel - Re: [syzbot] [v9fs?] WARNING in p9pdu

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Message-ID: <671cb066.050a0220.2fdf0c.0227.GAE@google.com>
Date: Sat, 26 Oct 2024 02:03:34 -0700
From: syzbot <syzbot+94b73a3e8ea625efcd05@...kaller.appspotmail.com>
To: asmadeus@...ewreck.org, ericvh@...nel.org, linux-kernel@...r.kernel.org, 
	linux_oss@...debyte.com, lucho@...kov.net, syzkaller-bugs@...glegroups.com, 
	v9fs@...ts.linux.dev
Subject: Re: [syzbot] [v9fs?] WARNING in p9pdu_vwritef

syzbot has found a reproducer for the following issue on:

HEAD commit:    c71f8fb4dc91 Merge tag 'v6.12-rc4-smb3-client-fixes' of gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1604d65f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=309bb816d40abc28
dashboard link: https://syzkaller.appspot.com/bug?extid=94b73a3e8ea625efcd05
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=1104d65f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=149284a7980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-c71f8fb4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a47500c947a2/vmlinux-c71f8fb4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d8ce30ea9c33/bzImage-c71f8fb4.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+94b73a3e8ea625efcd05@...kaller.appspotmail.com

R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb06f03c42c
R13: 0000000000000010 R14: 00007fff482ff820 R15: 00007fff482ff908
 </TASK>
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5322 at lib/iov_iter.c:255 _copy_from_iter+0x35b/0x1e70 lib/iov_iter.c:255
Modules linked in:
CPU: 0 UID: 0 PID: 5322 Comm: syz-executor360 Not tainted 6.12.0-rc4-syzkaller-00256-gc71f8fb4dc91 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:_copy_from_iter+0x35b/0x1e70 lib/iov_iter.c:255
Code: 84 24 20 01 00 00 0f 85 8e 1a 00 00 48 8b 44 24 18 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 26 12 da fc 90 <0f> 0b 90 eb 17 e8 1b 12 da fc 4c 89 e8 4c 89 6c 24 18 e9 f8 fd ff
RSP: 0018:ffffc9000cf8ebe0 EFLAGS: 00010293
RAX: ffffffff84bad84a RBX: 0000000000000000 RCX: ffff8880009d8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000cf8ed50 R08: ffffffff84bad5af R09: 1ffffd400028a680
R10: dffffc0000000000 R11: fffff9400028a681 R12: ffff8880514d0017
R13: 0000000000007fec R14: ffff88801e217562 R15: 1ffff920019f1d90
FS:  00007fb06ef636c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 0000000042bac000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 copy_from_iter include/linux/uio.h:219 [inline]
 copy_from_iter_full include/linux/uio.h:236 [inline]
 pdu_write_u net/9p/protocol.c:234 [inline]
 p9pdu_vwritef+0x1c75/0x29e0 net/9p/protocol.c:614
 p9_client_prepare_req+0xa8d/0xf50 net/9p/client.c:651
 p9_client_rpc+0x19d/0xac0 net/9p/client.c:691
 p9_client_write+0x328/0x7a0 net/9p/client.c:1645
 v9fs_issue_write+0xfd/0x1c0 fs/9p/vfs_addr.c:59
 netfs_do_issue_write fs/netfs/write_issue.c:233 [inline]
 netfs_issue_write fs/netfs/write_issue.c:260 [inline]
 netfs_advance_write+0x972/0xbd0 fs/netfs/write_issue.c:301
 netfs_write_folio+0x12fb/0x2070 fs/netfs/write_issue.c:485
 netfs_writepages+0x8aa/0xb80 fs/netfs/write_issue.c:581
 do_writepages+0x35d/0x870 mm/page-writeback.c:2683
 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:398
 __filemap_fdatawrite_range mm/filemap.c:431 [inline]
 file_write_and_wait_range+0x195/0x280 mm/filemap.c:788
 v9fs_file_fsync+0xf3/0x1d0 fs/9p/vfs_file.c:418
 generic_write_sync include/linux/fs.h:2871 [inline]
 netfs_file_write_iter+0x36d/0x3f0 fs/netfs/buffered_write.c:487
 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: 0033:0x7fb06efb6b39
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 1f 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:00007fb06ef63148 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb06ef63150 RCX: 00007fb06efb6b39
RDX: 000000000000fdef RSI: 0000000020000100 RDI: 0000000000000007
RBP: 0000000000000002 R08: 00007fb06ef62ee6 R09: 0000000000003933
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb06f03c42c
R13: 0000000000000010 R14: 00007fff482ff820 R15: 00007fff482ff908
 </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.