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Tue, 07 Apr 2026 02:16:13 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488a4b2e111sm275137475e9.1.2026.04.07.02.16.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Apr 2026 02:16:12 -0700 (PDT) Date: Tue, 7 Apr 2026 12:16:09 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, Andreas Gruenbacher Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev, gfs2@lists.linux.dev Subject: [gfs2:for-next 13/17] fs/gfs2/log.c:1183 __gfs2_log_flush() error: we previously assumed 'sdp->sd_jdesc' could be null (see line 1136) Message-ID: <202604071139.HNJiCaAi-lkp@intel.com> Precedence: bulk X-Mailing-List: gfs2@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline tree: https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git for-next head: 80d71795c17ec98352d1059af856ac084a06109a commit: 47af62bd5b63da799ea51f53ff93b5f1a3d19046 [13/17] gfs2: add some missing log locking config: csky-randconfig-r071-20260406 (https://download.01.org/0day-ci/archive/20260407/202604071139.HNJiCaAi-lkp@intel.com/config) compiler: csky-linux-gcc (GCC) 15.2.0 smatch: v0.5.0-9004-gb810ac53 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202604071139.HNJiCaAi-lkp@intel.com/ New smatch warnings: fs/gfs2/log.c:1183 __gfs2_log_flush() error: we previously assumed 'sdp->sd_jdesc' could be null (see line 1136) vim +1183 fs/gfs2/log.c 47af62bd5b63da Andreas Gruenbacher 2026-03-31 1065 static void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, 47af62bd5b63da Andreas Gruenbacher 2026-03-31 1066 u32 flags) b3b94faa5fe596 David Teigland 2006-01-16 1067 { 2ca0c2fbf3ed7f Bob Peterson 2019-11-13 1068 struct gfs2_trans *tr = NULL; fe3e397668775e Andreas Gruenbacher 2020-12-10 1069 unsigned int reserved_blocks = 0, used_blocks = 0; 5432af15f8772d Andreas Gruenbacher 2022-08-18 1070 bool frozen = test_bit(SDF_FROZEN, &sdp->sd_flags); fe3e397668775e Andreas Gruenbacher 2020-12-10 1071 unsigned int first_log_head; 2129b4288852cf Andreas Gruenbacher 2020-12-17 1072 unsigned int reserved_revokes = 0; b3b94faa5fe596 David Teigland 2006-01-16 1073 fe3e397668775e Andreas Gruenbacher 2020-12-10 1074 trace_gfs2_log_flush(sdp, 1, flags); b3b94faa5fe596 David Teigland 2006-01-16 1075 fe3e397668775e Andreas Gruenbacher 2020-12-10 1076 repeat: 2ca0c2fbf3ed7f Bob Peterson 2019-11-13 1077 /* 2ca0c2fbf3ed7f Bob Peterson 2019-11-13 1078 * Do this check while holding the log_flush_lock to prevent new 2ca0c2fbf3ed7f Bob Peterson 2019-11-13 1079 * buffers from being added to the ail via gfs2_pin() 2ca0c2fbf3ed7f Bob Peterson 2019-11-13 1080 */ 1b7d498dcab489 Andreas Gruenbacher 2025-08-06 1081 if (gfs2_withdrawn(sdp) || 4d927b03a68846 Andreas Gruenbacher 2023-12-20 1082 !test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) 2ca0c2fbf3ed7f Bob Peterson 2019-11-13 1083 goto out; 2ca0c2fbf3ed7f Bob Peterson 2019-11-13 1084 2bcd610d2fdea6 Steven Whitehouse 2007-11-08 1085 /* Log might have been flushed while we waited for the flush lock */ 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1086 if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1087 goto out; f55ab26a8f92a2 Steven Whitehouse 2006-02-21 1088 fe3e397668775e Andreas Gruenbacher 2020-12-10 1089 first_log_head = sdp->sd_log_head; fe3e397668775e Andreas Gruenbacher 2020-12-10 1090 sdp->sd_log_flush_head = first_log_head; 400ac52e805bb6 Benjamin Marzinski 2015-12-09 1091 16ca9412d80181 Benjamin Marzinski 2013-04-05 1092 tr = sdp->sd_log_tr; fe3e397668775e Andreas Gruenbacher 2020-12-10 1093 if (tr || sdp->sd_log_num_revoke) { fe3e397668775e Andreas Gruenbacher 2020-12-10 1094 if (reserved_blocks) fe3e397668775e Andreas Gruenbacher 2020-12-10 1095 gfs2_log_release(sdp, reserved_blocks); fe3e397668775e Andreas Gruenbacher 2020-12-10 1096 reserved_blocks = sdp->sd_log_blks_reserved; 2129b4288852cf Andreas Gruenbacher 2020-12-17 1097 reserved_revokes = sdp->sd_log_num_revoke; 16ca9412d80181 Benjamin Marzinski 2013-04-05 1098 if (tr) { 16ca9412d80181 Benjamin Marzinski 2013-04-05 1099 sdp->sd_log_tr = NULL; fe3e397668775e Andreas Gruenbacher 2020-12-10 1100 tr->tr_first = first_log_head; 5432af15f8772d Andreas Gruenbacher 2022-08-18 1101 if (unlikely(frozen)) { 8daf6c2b3d8cee Andreas Gruenbacher 2025-08-05 1102 if (gfs2_assert_withdraw(sdp, ca399c96e96e3f Bob Peterson 2020-01-08 1103 !tr->tr_num_buf_new && !tr->tr_num_databuf_new)) 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1104 goto out_withdraw; 16ca9412d80181 Benjamin Marzinski 2013-04-05 1105 } 2129b4288852cf Andreas Gruenbacher 2020-12-17 1106 } fe3e397668775e Andreas Gruenbacher 2020-12-10 1107 } else if (!reserved_blocks) { fe3e397668775e Andreas Gruenbacher 2020-12-10 1108 unsigned int taboo_blocks = GFS2_LOG_FLUSH_MIN_BLOCKS; fe3e397668775e Andreas Gruenbacher 2020-12-10 1109 fe3e397668775e Andreas Gruenbacher 2020-12-10 1110 reserved_blocks = GFS2_LOG_FLUSH_MIN_BLOCKS; fe3e397668775e Andreas Gruenbacher 2020-12-10 1111 if (current == sdp->sd_logd_process) fe3e397668775e Andreas Gruenbacher 2020-12-10 1112 taboo_blocks = 0; fe3e397668775e Andreas Gruenbacher 2020-12-10 1113 fe3e397668775e Andreas Gruenbacher 2020-12-10 1114 if (!__gfs2_log_try_reserve(sdp, reserved_blocks, taboo_blocks)) { fe3e397668775e Andreas Gruenbacher 2020-12-10 1115 up_write(&sdp->sd_log_flush_lock); fe3e397668775e Andreas Gruenbacher 2020-12-10 1116 __gfs2_log_reserve(sdp, reserved_blocks, taboo_blocks); fe3e397668775e Andreas Gruenbacher 2020-12-10 1117 down_write(&sdp->sd_log_flush_lock); fe3e397668775e Andreas Gruenbacher 2020-12-10 1118 goto repeat; fe3e397668775e Andreas Gruenbacher 2020-12-10 1119 } 2129b4288852cf Andreas Gruenbacher 2020-12-17 1120 BUG_ON(sdp->sd_log_num_revoke); fe3e397668775e Andreas Gruenbacher 2020-12-10 1121 } fe3e397668775e Andreas Gruenbacher 2020-12-10 1122 fe3e397668775e Andreas Gruenbacher 2020-12-10 1123 if (flags & GFS2_LOG_HEAD_FLUSH_SHUTDOWN) fe3e397668775e Andreas Gruenbacher 2020-12-10 1124 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); f55ab26a8f92a2 Steven Whitehouse 2006-02-21 1125 5432af15f8772d Andreas Gruenbacher 2022-08-18 1126 if (unlikely(frozen)) 8daf6c2b3d8cee Andreas Gruenbacher 2025-08-05 1127 if (gfs2_assert_withdraw(sdp, !reserved_revokes)) 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1128 goto out_withdraw; b3b94faa5fe596 David Teigland 2006-01-16 1129 d7b616e252b125 Steven Whitehouse 2007-09-02 1130 gfs2_ordered_write(sdp); 1b7d498dcab489 Andreas Gruenbacher 2025-08-06 1131 if (gfs2_withdrawn(sdp)) 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1132 goto out_withdraw; d69a3c6561362a Steven Whitehouse 2014-02-21 1133 lops_before_commit(sdp, tr); 1b7d498dcab489 Andreas Gruenbacher 2025-08-06 1134 if (gfs2_withdrawn(sdp)) 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1135 goto out_withdraw; 35264909e9d197 Andreas Gruenbacher 2024-03-11 @1136 if (sdp->sd_jdesc) ^^^^^^^^^^^^^ Here the code assumes that sdp->sd_jdesc can be NULL. 4a94f052e09827 Andreas Gruenbacher 2025-12-11 1137 gfs2_log_submit_write(&sdp->sd_jdesc->jd_log_bio); 1b7d498dcab489 Andreas Gruenbacher 2025-08-06 1138 if (gfs2_withdrawn(sdp)) 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1139 goto out_withdraw; d7b616e252b125 Steven Whitehouse 2007-09-02 1140 34cc1781c2ae92 Steven Whitehouse 2012-03-09 1141 if (sdp->sd_log_head != sdp->sd_log_flush_head) { c1696fb85d3319 Bob Peterson 2018-01-17 1142 log_write_header(sdp, flags); 5cb738b5fbd2f3 Andreas Gruenbacher 2020-12-19 1143 } else if (sdp->sd_log_tail != sdp->sd_log_flush_tail && !sdp->sd_log_idle) { c1696fb85d3319 Bob Peterson 2018-01-17 1144 log_write_header(sdp, flags); 2332c4435bb733 Robert Peterson 2007-06-18 1145 } 1b7d498dcab489 Andreas Gruenbacher 2025-08-06 1146 if (gfs2_withdrawn(sdp)) 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1147 goto out_withdraw; 16ca9412d80181 Benjamin Marzinski 2013-04-05 1148 lops_after_commit(sdp, tr); b09e593d799560 Steven Whitehouse 2006-04-07 1149 5a15907f99e5d9 Andreas Gruenbacher 2026-03-20 1150 spin_lock(&sdp->sd_log_lock); faa31ce85f626d Steven Whitehouse 2006-09-13 1151 sdp->sd_log_blks_reserved = 0; b3b94faa5fe596 David Teigland 2006-01-16 1152 d6a079e82efd5f Dave Chinner 2011-03-11 1153 spin_lock(&sdp->sd_ail_lock); 16ca9412d80181 Benjamin Marzinski 2013-04-05 1154 if (tr && !list_empty(&tr->tr_ail1_list)) { 16ca9412d80181 Benjamin Marzinski 2013-04-05 1155 list_add(&tr->tr_list, &sdp->sd_ail1_list); 16ca9412d80181 Benjamin Marzinski 2013-04-05 1156 tr = NULL; b3b94faa5fe596 David Teigland 2006-01-16 1157 } d6a079e82efd5f Dave Chinner 2011-03-11 1158 spin_unlock(&sdp->sd_ail_lock); 5a15907f99e5d9 Andreas Gruenbacher 2026-03-20 1159 spin_unlock(&sdp->sd_log_lock); 24972557b12ce8 Benjamin Marzinski 2014-05-01 1160 c1696fb85d3319 Bob Peterson 2018-01-17 1161 if (!(flags & GFS2_LOG_HEAD_FLUSH_NORMAL)) { 24972557b12ce8 Benjamin Marzinski 2014-05-01 1162 if (!sdp->sd_log_idle) { d5dc3d9677394d Bob Peterson 2020-05-22 1163 empty_ail1_list(sdp); 1b7d498dcab489 Andreas Gruenbacher 2025-08-06 1164 if (gfs2_withdrawn(sdp)) 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1165 goto out_withdraw; c1696fb85d3319 Bob Peterson 2018-01-17 1166 log_write_header(sdp, flags); 24972557b12ce8 Benjamin Marzinski 2014-05-01 1167 } c1696fb85d3319 Bob Peterson 2018-01-17 1168 if (flags & (GFS2_LOG_HEAD_FLUSH_SHUTDOWN | c1696fb85d3319 Bob Peterson 2018-01-17 1169 GFS2_LOG_HEAD_FLUSH_FREEZE)) 24972557b12ce8 Benjamin Marzinski 2014-05-01 1170 gfs2_log_shutdown(sdp); 24972557b12ce8 Benjamin Marzinski 2014-05-01 1171 } 24972557b12ce8 Benjamin Marzinski 2014-05-01 1172 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1173 out_end: fe3e397668775e Andreas Gruenbacher 2020-12-10 1174 used_blocks = log_distance(sdp, sdp->sd_log_flush_head, first_log_head); 2129b4288852cf Andreas Gruenbacher 2020-12-17 1175 reserved_revokes += atomic_read(&sdp->sd_log_revokes_available); 2129b4288852cf Andreas Gruenbacher 2020-12-17 1176 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs); 2129b4288852cf Andreas Gruenbacher 2020-12-17 1177 gfs2_assert_withdraw(sdp, reserved_revokes % sdp->sd_inptrs == sdp->sd_ldptrs); 2129b4288852cf Andreas Gruenbacher 2020-12-17 1178 if (reserved_revokes > sdp->sd_ldptrs) 2129b4288852cf Andreas Gruenbacher 2020-12-17 1179 reserved_blocks += (reserved_revokes - sdp->sd_ldptrs) / sdp->sd_inptrs; 30fe70a85a909a Bob Peterson 2019-11-13 1180 out: 2129b4288852cf Andreas Gruenbacher 2020-12-17 1181 if (used_blocks != reserved_blocks) { 8daf6c2b3d8cee Andreas Gruenbacher 2025-08-05 1182 gfs2_assert_withdraw(sdp, used_blocks < reserved_blocks); fe3e397668775e Andreas Gruenbacher 2020-12-10 @1183 gfs2_log_release(sdp, reserved_blocks - used_blocks); But later, this dereferences sdp->sd_jdesc without checking. 2129b4288852cf Andreas Gruenbacher 2020-12-17 1184 } 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1185 gfs2_trans_free(sdp, tr); fe3e397668775e Andreas Gruenbacher 2020-12-10 1186 trace_gfs2_log_flush(sdp, 0, flags); 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1187 return; 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1188 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1189 out_withdraw: 9e34adb1cc582b Andreas Gruenbacher 2026-03-19 1190 gfs2_trans_drain(tr); 58e08e8d83ab03 Bob Peterson 2020-06-09 1191 /** 58e08e8d83ab03 Bob Peterson 2020-06-09 1192 * If the tr_list is empty, we're withdrawing during a log 58e08e8d83ab03 Bob Peterson 2020-06-09 1193 * flush that targets a transaction, but the transaction was 58e08e8d83ab03 Bob Peterson 2020-06-09 1194 * never queued onto any of the ail lists. Here we add it to 58e08e8d83ab03 Bob Peterson 2020-06-09 1195 * ail1 just so that ail_drain() will find and free it. 58e08e8d83ab03 Bob Peterson 2020-06-09 1196 */ 58e08e8d83ab03 Bob Peterson 2020-06-09 1197 spin_lock(&sdp->sd_ail_lock); 58e08e8d83ab03 Bob Peterson 2020-06-09 1198 if (tr && list_empty(&tr->tr_list)) 58e08e8d83ab03 Bob Peterson 2020-06-09 1199 list_add(&tr->tr_list, &sdp->sd_ail1_list); 58e08e8d83ab03 Bob Peterson 2020-06-09 1200 spin_unlock(&sdp->sd_ail_lock); 2ca0c2fbf3ed7f Bob Peterson 2019-11-13 1201 tr = NULL; 5a61ae1402f152 Andreas Gruenbacher 2020-08-28 1202 goto out_end; b3b94faa5fe596 David Teigland 2006-01-16 1203 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki