pkg/report: drop "ALT: KMSAN origin" titles for uninit reports

It was initially proposed in
https://github.com/google/syzkaller/issues/1575 that KMSAN reports with
the same origin should be clustered together using an alt title.

This however turns out to be too aggressive: certain KMSAN reports have
their uninitialized values originating from common functions - this
leads to too many KMSAN reports being glued together. Because KMSAN
reports can be also clustered with KASAN reports or other kernel panics,
ultimately seemingly unrelated crashes are considered similar just
because they share their top frames with two KMSAN reports that, in
turn, share the same origin.

The resulting issues on the dashboard look confusing to the users, they
are hard to find and require manual untangling, which probably outweighs
the benefits of having KMSAN issues with exactly the same origin
clustered together.

For other types of KMSAN reports (infoleaks and use-after-frees) the alt
titles are preserved. First, there are fewer of those on the dashboard.
Second, they are rarely grouped together with non-KASAN reports and
are less likely to cause a lot of mess.

21 files changed, 0 insertions, 21 deletions

diff --git a/pkg/report/linux.go b/pkg/report/linux.go
index fd63bf7e4..9629e0dea 100644
--- a/pkg/report/linux.go
+++ b/pkg/report/linux.go
@@ -1374,7 +1374,6 @@ var linuxOopses = append([]*oops{
 				fmt:    "KMSAN: %[1]v in %[3]v",
 				alt: []string{
 					"bad-access in %[3]v",
-					"KMSAN origin in %[4]v",
 				},
 				stack: &stackFmt{
 					parts: []*regexp.Regexp{
diff --git a/pkg/report/testdata/linux/report/626 b/pkg/report/testdata/linux/report/626
index ec3b78e66..ec587b5bc 100644
--- a/pkg/report/testdata/linux/report/626
+++ b/pkg/report/testdata/linux/report/626
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in prepare_task_switch
-ALT: KMSAN origin in step_into
 ALT: bad-access in prepare_task_switch
 
 [  567.476354][    T1] =====================================================
diff --git a/pkg/report/testdata/linux/report/632 b/pkg/report/testdata/linux/report/632
index 0eb653ec4..790928002 100644
--- a/pkg/report/testdata/linux/report/632
+++ b/pkg/report/testdata/linux/report/632
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in __perf_event_task_sched_in
-ALT: KMSAN origin in corrupted
 ALT: bad-access in __perf_event_task_sched_in
 CORRUPTED: Y
 
diff --git a/pkg/report/testdata/linux/report/633 b/pkg/report/testdata/linux/report/633
index 7051b6b70..2f288082a 100644
--- a/pkg/report/testdata/linux/report/633
+++ b/pkg/report/testdata/linux/report/633
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in prepend_path
-ALT: KMSAN origin in corrupted
 ALT: bad-access in prepend_path
 CORRUPTED: Y
 
diff --git a/pkg/report/testdata/linux/report/634 b/pkg/report/testdata/linux/report/634
index d6954660d..bab9f83b9 100644
--- a/pkg/report/testdata/linux/report/634
+++ b/pkg/report/testdata/linux/report/634
@@ -1,5 +1,4 @@
 TITLE: KMSAN: kernel-infoleak in urandom_read_nowarn
-ALT: KMSAN origin in crng_reseed
 ALT: bad-access in urandom_read_nowarn
 
 [  600.161674][ T9046] =====================================================
diff --git a/pkg/report/testdata/linux/report/635 b/pkg/report/testdata/linux/report/635
index 22656f737..d97678487 100644
--- a/pkg/report/testdata/linux/report/635
+++ b/pkg/report/testdata/linux/report/635
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in sctp_epaddr_lookup_transport
-ALT: KMSAN origin in sctp_rcv
 ALT: bad-access in sctp_epaddr_lookup_transport
 
 [  701.063465][    C1] =====================================================
diff --git a/pkg/report/testdata/linux/report/636 b/pkg/report/testdata/linux/report/636
index c570b7e4c..7e9eef087 100644
--- a/pkg/report/testdata/linux/report/636
+++ b/pkg/report/testdata/linux/report/636
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in ppp_send_frame
-ALT: KMSAN origin in ppp_write
 ALT: bad-access in ppp_send_frame
 
 [   87.733076][ T3479] =====================================================
diff --git a/pkg/report/testdata/linux/report/670 b/pkg/report/testdata/linux/report/670
index b4bd603ad..0428bf948 100644
--- a/pkg/report/testdata/linux/report/670
+++ b/pkg/report/testdata/linux/report/670
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in native_apic_mem_write
-ALT: KMSAN origin in inet_reqsk_alloc
 ALT: bad-access in native_apic_mem_write
 
 [  663.629383][    C1] =====================================================
diff --git a/pkg/report/testdata/linux/report/671 b/pkg/report/testdata/linux/report/671
index f25691215..36009ea9c 100644
--- a/pkg/report/testdata/linux/report/671
+++ b/pkg/report/testdata/linux/report/671
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in flush_to_ldisc
-ALT: KMSAN origin in __pskb_copy_fclone
 ALT: bad-access in flush_to_ldisc
 
 [ 1725.922949][   T52] =====================================================
diff --git a/pkg/report/testdata/linux/report/672 b/pkg/report/testdata/linux/report/672
index 7445f8e93..a0e7092f8 100644
--- a/pkg/report/testdata/linux/report/672
+++ b/pkg/report/testdata/linux/report/672
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in ext4_evict_inode
-ALT: KMSAN origin in ext4_alloc_inode
 ALT: bad-access in ext4_evict_inode
 
 [  345.516988][ T3516] =====================================================
diff --git a/pkg/report/testdata/linux/report/673 b/pkg/report/testdata/linux/report/673
index 8749b96f4..4de88a7b8 100644
--- a/pkg/report/testdata/linux/report/673
+++ b/pkg/report/testdata/linux/report/673
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in nilfs_bmap_lookup_at_level
-ALT: KMSAN origin in nilfs_alloc_inode
 ALT: bad-access in nilfs_bmap_lookup_at_level
 
 [  231.715107][ T3795] =====================================================
diff --git a/pkg/report/testdata/linux/report/674 b/pkg/report/testdata/linux/report/674
index be8e5281d..475ed238b 100644
--- a/pkg/report/testdata/linux/report/674
+++ b/pkg/report/testdata/linux/report/674
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in ntfs_iget5
-ALT: KMSAN origin in ntfs_alloc_inode
 ALT: bad-access in ntfs_iget5
 
 [  493.519926][ T7865] =====================================================
diff --git a/pkg/report/testdata/linux/report/681 b/pkg/report/testdata/linux/report/681
index ec1bf34b4..8a913d6bb 100644
--- a/pkg/report/testdata/linux/report/681
+++ b/pkg/report/testdata/linux/report/681
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in net_tx_action
-ALT: KMSAN origin in rtnetlink_rcv
 ALT: bad-access in net_tx_action
 
 [  142.141483][    C0] =====================================================
diff --git a/pkg/report/testdata/linux/report/682 b/pkg/report/testdata/linux/report/682
index a95f80626..de06ddd0c 100644
--- a/pkg/report/testdata/linux/report/682
+++ b/pkg/report/testdata/linux/report/682
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in ieee80211_rx_list
-ALT: KMSAN origin in nfnetlink_rcv
 ALT: bad-access in ieee80211_rx_list
 
 [  338.587187][    C0] BUG: KMSAN: uninit-value in ieee80211_rx_list+0x1839/0x5860
diff --git a/pkg/report/testdata/linux/report/689 b/pkg/report/testdata/linux/report/689
index 046158c1b..3453a7280 100644
--- a/pkg/report/testdata/linux/report/689
+++ b/pkg/report/testdata/linux/report/689
@@ -1,5 +1,4 @@
 TITLE: KMSAN: kernel-infoleak in kernfs_fop_read_iter
-ALT: KMSAN origin in dev_set_name
 ALT: bad-access in kernfs_fop_read_iter
 
 [  160.663319][ T5029] =====================================================
diff --git a/pkg/report/testdata/linux/report/690 b/pkg/report/testdata/linux/report/690
index fa691a594..085091756 100644
--- a/pkg/report/testdata/linux/report/690
+++ b/pkg/report/testdata/linux/report/690
@@ -1,5 +1,4 @@
 TITLE: KMSAN: kernel-infoleak in __skb_datagram_iter
-ALT: KMSAN origin in pfkey_add
 ALT: bad-access in __skb_datagram_iter
 
 [ 2104.495854][ T4311] =====================================================
diff --git a/pkg/report/testdata/linux/report/699 b/pkg/report/testdata/linux/report/699
index 6348f1479..7652c93bc 100644
--- a/pkg/report/testdata/linux/report/699
+++ b/pkg/report/testdata/linux/report/699
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in aes_encrypt
-ALT: KMSAN origin in ext4_write_begin
 ALT: bad-access in aes_encrypt
 
 [  311.903743][ T5388] =====================================================
diff --git a/pkg/report/testdata/linux/report/700 b/pkg/report/testdata/linux/report/700
index 1abfba7b5..30154272f 100644
--- a/pkg/report/testdata/linux/report/700
+++ b/pkg/report/testdata/linux/report/700
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in virtqueue_add
-ALT: KMSAN origin in ext4_da_write_begin
 ALT: bad-access in virtqueue_add
 
 [  897.203644][ T1083] =====================================================
diff --git a/pkg/report/testdata/linux/report/701 b/pkg/report/testdata/linux/report/701
index a12d3869c..649afb171 100644
--- a/pkg/report/testdata/linux/report/701
+++ b/pkg/report/testdata/linux/report/701
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in btrfs_bin_search
-ALT: KMSAN origin in alloc_extent_buffer
 ALT: bad-access in btrfs_bin_search
 
 [  343.493742][ T5647] =====================================================
diff --git a/pkg/report/testdata/linux/report/702 b/pkg/report/testdata/linux/report/702
index 143ae90b9..d42f510c0 100644
--- a/pkg/report/testdata/linux/report/702
+++ b/pkg/report/testdata/linux/report/702
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in post_read_mst_fixup
-ALT: KMSAN origin in map_mft_record
 ALT: bad-access in post_read_mst_fixup
 
 [  355.605345][ T5697] =====================================================
diff --git a/pkg/report/testdata/linux/report/703 b/pkg/report/testdata/linux/report/703
index e83e75f1e..b024bff59 100644
--- a/pkg/report/testdata/linux/report/703
+++ b/pkg/report/testdata/linux/report/703
@@ -1,5 +1,4 @@
 TITLE: KMSAN: uninit-value in nilfs_add_checksums_on_logs
-ALT: KMSAN origin in block_write_begin
 ALT: bad-access in nilfs_add_checksums_on_logs
 
 [  417.716144][ T7542] =====================================================