[syzbot] [v9fs?] WARNING in p9pdu_vwritef

Hello,

syzbot found the following issue on:

HEAD commit: 075dbe9f6e3c Merge tag 'soc-ep93xx-dt-6.12' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=118086a9980000
kernel config: https://syzkaller.appspot.com/x/.config?x=b2d4fdf18a83ec0b
dashboard link: https://syzkaller.appspot.com/bug?extid=94b73a3e8ea625efcd05
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-075dbe9f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9c02adb371c0/vmlinux-075dbe9f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5e56aa110f69/bzImage-075dbe9f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]

FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 0 UID: 0 PID: 5107 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-11558-g075dbe9f6e3c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
fail_dump lib/fault-inject.c:53 [inline]
should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:154
should_failslab+0xac/0x100 mm/failslab.c:46
slab_pre_alloc_hook mm/slub.c:4039 [inline]
slab_alloc_node mm/slub.c:4115 [inline]
__kmalloc_cache_noprof+0x6c/0x2c0 mm/slub.c:4291
kmalloc_noprof include/linux/slab.h:878 [inline]
netfs_buffer_append_folio+0x1f1/0x8b0 fs/netfs/misc.c:25
netfs_write_folio+0xe69/0x1fe0 fs/netfs/write_issue.c:421
netfs_writepages+0x89f/0xe80 fs/netfs/write_issue.c:541
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
iter_file_splice_write+0xbfa/0x1510 fs/splice.c:743
do_splice_from fs/splice.c:941 [inline]
direct_splice_actor+0x11b/0x220 fs/splice.c:1164
splice_direct_to_actor+0x586/0xc80 fs/splice.c:1108
do_splice_direct_actor fs/splice.c:1207 [inline]
do_splice_direct+0x289/0x3e0 fs/splice.c:1233
do_sendfile+0x561/0xe10 fs/read_write.c:1388
__do_sys_sendfile64 fs/read_write.c:1455 [inline]
__se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1441
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: 0033:0x7f198897df39
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f19897ef038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f1988b35f80 RCX: 00007f198897df39
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007
RBP: 00007f19897ef090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f1988b35f80 R15: 00007ffe59816f08
</TASK>
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5107 at lib/iov_iter.c:255 _copy_from_iter+0x300/0x1d60 lib/iov_iter.c:255
Modules linked in:
CPU: 0 UID: 0 PID: 5107 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-11558-g075dbe9f6e3c #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+0x300/0x1d60 lib/iov_iter.c:255
Code: 48 3b 84 24 20 01 00 00 0f 85 d2 19 00 00 4c 89 e0 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 01 5c db fc 90 <0f> 0b 90 45 31 e4 eb 96 e8 f3 5b db fc 4d 89 ec e9 3e fe ff ff e8
RSP: 0018:ffffc90002e7e680 EFLAGS: 00010293
RAX: ffffffff84b9586f RBX: 0000000000000000 RCX: ffff88801ab9a440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002e7e7f0 R08: ffffffff84b95627 R09: 1ffffffff2039b65
R10: dffffc0000000000 R11: fffffbfff2039b66 R12: 0000000000000007
R13: 0000000000000007 R14: ffff88801e137560 R15: ffff88801e137562
FS: 00007f19897ef6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1988b0b538 CR3: 00000000126de000 CR4: 0000000000350ef0
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:1635
v9fs_issue_write+0xfd/0x1c0 fs/9p/vfs_addr.c:59
netfs_do_issue_write fs/netfs/write_issue.c:223 [inline]
netfs_issue_write fs/netfs/write_issue.c:250 [inline]
netfs_advance_write+0x4c8/0xb20 fs/netfs/write_issue.c:291
netfs_write_folio+0x12f4/0x1fe0 fs/netfs/write_issue.c:469
netfs_writepages+0x89f/0xe80 fs/netfs/write_issue.c:541
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
iter_file_splice_write+0xbfa/0x1510 fs/splice.c:743
do_splice_from fs/splice.c:941 [inline]
direct_splice_actor+0x11b/0x220 fs/splice.c:1164
splice_direct_to_actor+0x586/0xc80 fs/splice.c:1108
do_splice_direct_actor fs/splice.c:1207 [inline]
do_splice_direct+0x289/0x3e0 fs/splice.c:1233
do_sendfile+0x561/0xe10 fs/read_write.c:1388
__do_sys_sendfile64 fs/read_write.c:1455 [inline]
__se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1441
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: 0033:0x7f198897df39
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f19897ef038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f1988b35f80 RCX: 00007f198897df39
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007
RBP: 00007f19897ef090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f1988b35f80 R15: 00007ffe59816f08
</TASK>


---
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 [email protected].

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

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
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
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb06f03c42c
R13: 0000000000000010 R14: 00007fff482ff820 R15: 00007fff482ff908
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
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
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
CR2: 000000002000f000 CR3: 0000000042bac000 CR4: 0000000000352ef0
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
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
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.