From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com, Dan Carpenter <error27@gmail.com>
Subject: [cel:nfsd-testing 104/186] fs/nfsd/nfs4proc.c:2397 nfsd4_copy() error: we previously assumed 'copy->nf_src' could be null (see line 2331)
Date: Thu, 05 Nov 2026 15:56:58 +0100 [thread overview]
Message-ID: <202611051518.Z5k1PDaY-lkp@intel.com> (raw)
Unfiltered warning: this smatch report is sent as-is and has not been
reviewed for false positives, so please treat it with due skepticism.
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: Daejun Park <daejun7.park@samsung.com>
CC: Chuck Lever <cel@kernel.org>
CC: Benjamin Coddington <bcodding@hammerspace.com>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/cel/linux nfsd-testing
head: d692f252c52b8d1b4bc7481554f314df31ed8249
commit: 662ee656ddfd1cd5d49e51c99dedd0960be693f0 [104/186] nfsd: answer NFS4ERR_DELAY instead of waiting for a layout recall
:::::: branch date: 18 hours ago
:::::: commit date: 4 days ago
config: hexagon-randconfig-2200-20261105 (https://download.01.org/0day-ci/archive/20261105/202611051518.Z5k1PDaY-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
smatch: v0.5.0-9187-g5189e3fb
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202611051518.Z5k1PDaY-lkp@intel.com/
smatch warnings:
fs/nfsd/nfs4proc.c:2397 nfsd4_copy() error: we previously assumed 'copy->nf_src' could be null (see line 2331)
vim +2397 fs/nfsd/nfs4proc.c
e0639dc5805a9d Olga Kornievskaia 2018-07-20 2292
29ae7f9dc21a7d Anna Schumaker 2016-09-07 2293 static __be32
29ae7f9dc21a7d Anna Schumaker 2016-09-07 2294 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
eb69853da94592 Christoph Hellwig 2017-05-08 2295 union nfsd4_op_u *u)
29ae7f9dc21a7d Anna Schumaker 2016-09-07 2296 {
9ed666eba4e0a2 Chuck Lever 2024-08-28 2297 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
f307b4f7ed174a Jeff Layton 2026-07-10 2298 struct nfsd4_async_copy *async_copy = NULL;
eb69853da94592 Christoph Hellwig 2017-05-08 2299 struct nfsd4_copy *copy = &u->copy;
9ed666eba4e0a2 Chuck Lever 2024-08-28 2300 struct nfsd42_write_res *result;
662ee656ddfd1c Daejun Park 2026-10-15 2301 struct inode *src, *dst;
29ae7f9dc21a7d Anna Schumaker 2016-09-07 2302 __be32 status;
29ae7f9dc21a7d Anna Schumaker 2016-09-07 2303
9ed666eba4e0a2 Chuck Lever 2024-08-28 2304 result = ©->cp_res;
9ed666eba4e0a2 Chuck Lever 2024-08-28 2305 nfsd_copy_write_verifier((__be32 *)&result->wr_verifier.data, nn);
9ed666eba4e0a2 Chuck Lever 2024-08-28 2306
15d1975b727969 Dai Ngo 2023-08-30 2307 copy->cp_clp = cstate->clp;
1913cdf56cb5bf Chuck Lever 2022-07-27 2308 if (nfsd4_ssc_is_inter(copy)) {
5896a870546105 Dai Ngo 2023-08-31 2309 trace_nfsd_copy_inter(copy);
1913cdf56cb5bf Chuck Lever 2022-07-27 2310 if (!inter_copy_offload_enable || nfsd4_copy_is_sync(copy)) {
ce0887ac96d35c Olga Kornievskaia 2019-10-09 2311 status = nfserr_notsupp;
29ae7f9dc21a7d Anna Schumaker 2016-09-07 2312 goto out;
ce0887ac96d35c Olga Kornievskaia 2019-10-09 2313 }
df24ac7a2e3a9d Dai Ngo 2022-12-18 2314 status = nfsd4_setup_inter_ssc(rqstp, cstate, copy);
5896a870546105 Dai Ngo 2023-08-31 2315 if (status) {
88a76145451d70 Jeff Layton 2026-05-31 2316 status = nfserr_offload_denied;
88a76145451d70 Jeff Layton 2026-05-31 2317 goto out;
5896a870546105 Dai Ngo 2023-08-31 2318 }
ce0887ac96d35c Olga Kornievskaia 2019-10-09 2319 } else {
5896a870546105 Dai Ngo 2023-08-31 2320 trace_nfsd_copy_intra(copy);
ce0887ac96d35c Olga Kornievskaia 2019-10-09 2321 status = nfsd4_setup_intra_ssc(rqstp, cstate, copy);
88a76145451d70 Jeff Layton 2026-05-31 2322 if (status)
88a76145451d70 Jeff Layton 2026-05-31 2323 goto out;
5896a870546105 Dai Ngo 2023-08-31 2324 }
29ae7f9dc21a7d Anna Schumaker 2016-09-07 2325
662ee656ddfd1c Daejun Park 2026-10-15 2326 /*
662ee656ddfd1c Daejun Park 2026-10-15 2327 * A copy can be done as a clone, which breaks both files. The source
662ee656ddfd1c Daejun Park 2026-10-15 2328 * of an inter-server copy is not local.
662ee656ddfd1c Daejun Park 2026-10-15 2329 */
662ee656ddfd1c Daejun Park 2026-10-15 2330 dst = file_inode(copy->nf_dst->nf_file);
662ee656ddfd1c Daejun Park 2026-10-15 @2331 src = copy->nf_src ? file_inode(copy->nf_src->nf_file) : dst;
662ee656ddfd1c Daejun Park 2026-10-15 2332 if (nfsd_break_layouts(dst, src != dst ? src : NULL))
662ee656ddfd1c Daejun Park 2026-10-15 2333 goto out_err;
662ee656ddfd1c Daejun Park 2026-10-15 2334
e0639dc5805a9d Olga Kornievskaia 2018-07-20 2335 memcpy(©->fh, &cstate->current_fh.fh_handle,
e0639dc5805a9d Olga Kornievskaia 2018-07-20 2336 sizeof(struct knfsd_fh));
1913cdf56cb5bf Chuck Lever 2022-07-27 2337 if (nfsd4_copy_is_async(copy)) {
62c0f6eaf050bb Jeff Layton 2026-07-10 2338 struct task_struct *task;
62c0f6eaf050bb Jeff Layton 2026-07-10 2339
80c37618341130 Jeff Layton 2026-07-10 2340 /*
80c37618341130 Jeff Layton 2026-07-10 2341 * Allocate the durable async copy. Its offload stateid is a
80c37618341130 Jeff Layton 2026-07-10 2342 * first-class nfs4_stid in clp->cl_stateids, returned to the
80c37618341130 Jeff Layton 2026-07-10 2343 * client and freed only when the background copy is torn down.
80c37618341130 Jeff Layton 2026-07-10 2344 */
80c37618341130 Jeff Layton 2026-07-10 2345 async_copy = nfs4_alloc_copy_stid(cstate->clp);
e0639dc5805a9d Olga Kornievskaia 2018-07-20 2346 if (!async_copy)
ce0887ac96d35c Olga Kornievskaia 2019-10-09 2347 goto out_err;
f307b4f7ed174a Jeff Layton 2026-07-10 2348 async_copy->cp_copy.cp_nn = nn;
63fab04cbd0f96 Chuck Lever 2024-10-26 2349 INIT_LIST_HEAD(&async_copy->copies);
63fab04cbd0f96 Chuck Lever 2024-10-26 2350 refcount_set(&async_copy->refcount, 1);
aa0ebd21df9c90 Chuck Lever 2024-10-31 2351 async_copy->cp_ttl = NFSD_COPY_INITIAL_TTL;
aadc3bbea163b6 Chuck Lever 2024-08-28 2352 /* Arbitrary cap on number of pending async copy operations */
aadc3bbea163b6 Chuck Lever 2024-08-28 2353 if (atomic_inc_return(&nn->pending_async_copies) >
8286f8b6229901 Chuck Lever 2024-10-29 2354 (int)rqstp->rq_pool->sp_nrthreads)
9048cf05a17a7b Olga Kornievskaia 2024-12-17 2355 goto out_dec_async_copy_err;
f307b4f7ed174a Jeff Layton 2026-07-10 2356 async_copy->cp_copy.cp_src = kmalloc_obj(*async_copy->cp_copy.cp_src);
f307b4f7ed174a Jeff Layton 2026-07-10 2357 if (!async_copy->cp_copy.cp_src)
9048cf05a17a7b Olga Kornievskaia 2024-12-17 2358 goto out_dec_async_copy_err;
80c37618341130 Jeff Layton 2026-07-10 2359 memcpy(&result->cb_stateid, &async_copy->cp_stid.sc_stateid,
9ed666eba4e0a2 Chuck Lever 2024-08-28 2360 sizeof(result->cb_stateid));
f307b4f7ed174a Jeff Layton 2026-07-10 2361 /*
f307b4f7ed174a Jeff Layton 2026-07-10 2362 * dup after writing cb_stateid; duplicating first would leave
f307b4f7ed174a Jeff Layton 2026-07-10 2363 * the callback stateid zeroed.
f307b4f7ed174a Jeff Layton 2026-07-10 2364 */
f307b4f7ed174a Jeff Layton 2026-07-10 2365 dup_copy_fields(copy, &async_copy->cp_copy);
4183cf383b6fae Olga Kornievskaia 2026-04-10 2366 if ((READ_ONCE(copy->nf_dst->nf_file->f_mode) &
4183cf383b6fae Olga Kornievskaia 2026-04-10 2367 FMODE_NOCMTIME) != 0)
f307b4f7ed174a Jeff Layton 2026-07-10 2368 async_copy->cp_copy.attr_update = true;
b53a42970fa484 Chuck Lever 2025-03-01 2369 memcpy(async_copy->cp_cb_offload.co_referring_sessionid.data,
b53a42970fa484 Chuck Lever 2025-03-01 2370 cstate->session->se_sessionid.data,
b53a42970fa484 Chuck Lever 2025-03-01 2371 NFS4_MAX_SESSIONID_LEN);
b53a42970fa484 Chuck Lever 2025-03-01 2372 async_copy->cp_cb_offload.co_referring_slotid = cstate->slot->sl_index;
b53a42970fa484 Chuck Lever 2025-03-01 2373 async_copy->cp_cb_offload.co_referring_seqno = cstate->slot->sl_seqid;
62c0f6eaf050bb Jeff Layton 2026-07-10 2374 task = kthread_create(nfsd4_do_async_copy, async_copy,
62c0f6eaf050bb Jeff Layton 2026-07-10 2375 "%s", "copy thread");
62c0f6eaf050bb Jeff Layton 2026-07-10 2376 if (IS_ERR(task))
9048cf05a17a7b Olga Kornievskaia 2024-12-17 2377 goto out_dec_async_copy_err;
62c0f6eaf050bb Jeff Layton 2026-07-10 2378 /*
62c0f6eaf050bb Jeff Layton 2026-07-10 2379 * Pin the task_struct so kthread_stop() is safe after this
62c0f6eaf050bb Jeff Layton 2026-07-10 2380 * one-shot kthread exits. Released by nfs4_put_copy().
62c0f6eaf050bb Jeff Layton 2026-07-10 2381 */
62c0f6eaf050bb Jeff Layton 2026-07-10 2382 get_task_struct(task);
62c0f6eaf050bb Jeff Layton 2026-07-10 2383 async_copy->copy_task = task;
62c0f6eaf050bb Jeff Layton 2026-07-10 2384 /*
62c0f6eaf050bb Jeff Layton 2026-07-10 2385 * Take the kthread's ref and wake it before publishing, so the
62c0f6eaf050bb Jeff Layton 2026-07-10 2386 * publisher touches async_copy no further and teardown can
62c0f6eaf050bb Jeff Layton 2026-07-10 2387 * drain it.
62c0f6eaf050bb Jeff Layton 2026-07-10 2388 */
62c0f6eaf050bb Jeff Layton 2026-07-10 2389 refcount_inc(&async_copy->refcount);
62c0f6eaf050bb Jeff Layton 2026-07-10 2390 wake_up_process(async_copy->copy_task);
f307b4f7ed174a Jeff Layton 2026-07-10 2391 spin_lock(&async_copy->cp_copy.cp_clp->async_lock);
e0639dc5805a9d Olga Kornievskaia 2018-07-20 2392 list_add(&async_copy->copies,
f307b4f7ed174a Jeff Layton 2026-07-10 2393 &async_copy->cp_copy.cp_clp->async_copies);
f307b4f7ed174a Jeff Layton 2026-07-10 2394 spin_unlock(&async_copy->cp_copy.cp_clp->async_lock);
e0639dc5805a9d Olga Kornievskaia 2018-07-20 2395 status = nfs_ok;
ce0887ac96d35c Olga Kornievskaia 2019-10-09 2396 } else {
3b7bf5933cada7 Chuck Lever 2022-07-27 @2397 status = nfsd4_do_copy(copy, copy->nf_src->nf_file,
3b7bf5933cada7 Chuck Lever 2022-07-27 2398 copy->nf_dst->nf_file, true);
4183cf383b6fae Olga Kornievskaia 2026-04-10 2399 if ((READ_ONCE(copy->nf_dst->nf_file->f_mode) &
4183cf383b6fae Olga Kornievskaia 2026-04-10 2400 FMODE_NOCMTIME) != 0 &&
4183cf383b6fae Olga Kornievskaia 2026-04-10 2401 copy->cp_res.wr_bytes_written > 0)
4183cf383b6fae Olga Kornievskaia 2026-04-10 2402 nfsd_update_cmtime_attr(copy->nf_dst->nf_file, 0);
ce0887ac96d35c Olga Kornievskaia 2019-10-09 2403 }
29ae7f9dc21a7d Anna Schumaker 2016-09-07 2404 out:
5896a870546105 Dai Ngo 2023-08-31 2405 trace_nfsd_copy_done(copy, status);
6ba434cb1a8d40 Jeff Layton 2023-01-17 2406 release_copy_files(copy);
29ae7f9dc21a7d Anna Schumaker 2016-09-07 2407 return status;
9048cf05a17a7b Olga Kornievskaia 2024-12-17 2408 out_dec_async_copy_err:
9048cf05a17a7b Olga Kornievskaia 2024-12-17 2409 if (async_copy)
9048cf05a17a7b Olga Kornievskaia 2024-12-17 2410 atomic_dec(&nn->pending_async_copies);
e0639dc5805a9d Olga Kornievskaia 2018-07-20 2411 out_err:
34e8f9ec4c9ac2 Dai Ngo 2023-01-23 2412 if (nfsd4_ssc_is_inter(copy)) {
34e8f9ec4c9ac2 Dai Ngo 2023-01-23 2413 /*
34e8f9ec4c9ac2 Dai Ngo 2023-01-23 2414 * Source's vfsmount of inter-copy will be unmounted
34e8f9ec4c9ac2 Dai Ngo 2023-01-23 2415 * by the laundromat. Use copy instead of async_copy
34e8f9ec4c9ac2 Dai Ngo 2023-01-23 2416 * since async_copy->ss_nsui might not be set yet.
34e8f9ec4c9ac2 Dai Ngo 2023-01-23 2417 */
34e8f9ec4c9ac2 Dai Ngo 2023-01-23 2418 refcount_dec(©->ss_nsui->nsui_refcnt);
34e8f9ec4c9ac2 Dai Ngo 2023-01-23 2419 }
18f428d4e2f7ef Olga Kornievskaia 2019-12-04 2420 if (async_copy)
e0639dc5805a9d Olga Kornievskaia 2018-07-20 2421 cleanup_async_copy(async_copy);
aadc3bbea163b6 Chuck Lever 2024-08-28 2422 status = nfserr_jukebox;
e0639dc5805a9d Olga Kornievskaia 2018-07-20 2423 goto out;
e0639dc5805a9d Olga Kornievskaia 2018-07-20 2424 }
e0639dc5805a9d Olga Kornievskaia 2018-07-20 2425
:::::: The code at line 2397 was first introduced by commit
:::::: 3b7bf5933cada732783554edf0dc61283551c6cf NFSD: Refactor nfsd4_do_copy()
:::::: TO: Chuck Lever <chuck.lever@oracle.com>
:::::: CC: Chuck Lever <chuck.lever@oracle.com>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next reply other threads:[~2026-11-05 14:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-05 14:56 kernel test robot [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-11-05 19:32 [cel:nfsd-testing 104/186] fs/nfsd/nfs4proc.c:2397 nfsd4_copy() error: we previously assumed 'copy->nf_src' could be null (see line 2331) kernel test robot
2026-11-05 3:43 kernel test robot
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