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authorMike Christie <michael.christie@oracle.com>2023-03-19 02:56:16 +0100
committerMartin K. Petersen <martin.petersen@oracle.com>2023-03-24 22:32:23 +0100
commit395cee83d02de3073211b04fc85724f4abc663ad (patch)
tree211defc139811cda8c8dc1eaba799ba9d9f29959 /drivers/target
parentscsi: target: iscsit: isert: Alloc per conn cmd counter (diff)
downloadlinux-395cee83d02de3073211b04fc85724f4abc663ad.tar.xz
linux-395cee83d02de3073211b04fc85724f4abc663ad.zip
scsi: target: iscsit: Stop/wait on cmds during conn close
This fixes a bug added in commit f36199355c64 ("scsi: target: iscsi: Fix cmd abort fabric stop race"). If we have multiple sessions to the same se_device we can hit a race where a LUN_RESET on one session cleans up the se_cmds from under another session which is being closed. This results in the closing session freeing its conn/session structs while they are still in use. The bug is: 1. Session1 has IO se_cmd1. 2. Session2 can also have se_cmds for I/O and optionally TMRs for ABORTS but then gets a LUN_RESET. 3. The LUN_RESET on session2 sees the se_cmds on session1 and during the drain stages marks them all with CMD_T_ABORTED. 4. session1 is now closed so iscsit_release_commands_from_conn() only sees se_cmds with the CMD_T_ABORTED bit set and returns immediately even though we have outstanding commands. 5. session1's connection and session are freed. 6. The backend request for se_cmd1 completes and it accesses the freed connection/session. This hooks the iscsit layer into the cmd counter code, so we can wait for all outstanding se_cmds before freeing the connection. Fixes: f36199355c64 ("scsi: target: iscsi: Fix cmd abort fabric stop race") Signed-off-by: Mike Christie <michael.christie@oracle.com> Link: https://lore.kernel.org/r/20230319015620.96006-6-michael.christie@oracle.com Reviewed-by: Maurizio Lombardi <mlombard@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/iscsi/iscsi_target.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 11115c207844..83b007141229 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -4245,6 +4245,16 @@ static void iscsit_release_commands_from_conn(struct iscsit_conn *conn)
iscsit_free_cmd(cmd, true);
}
+
+ /*
+ * Wait on commands that were cleaned up via the aborted_task path.
+ * LLDs that implement iscsit_wait_conn will already have waited for
+ * commands.
+ */
+ if (!conn->conn_transport->iscsit_wait_conn) {
+ target_stop_cmd_counter(conn->cmd_cnt);
+ target_wait_for_cmds(conn->cmd_cnt);
+ }
}
static void iscsit_stop_timers_for_cmds(