pkg/report: do more agressive NUM-replacement

Replace not just long sequences of digits in report titles, but every
sequence of '0'-'9' that is not surrounded by word characters.
As such matches will overlap and Go does not (currently?) support regexp
lookarounds, do the replacement multiple times until there is nothing
more to do. This should not slow down syzkaller, since this code is
only invoked during crash processing.

Restrict LINE replacement only to fragments that have a preceeding file
name. This prevents replacements like [1:2] -> [NUM:LINE].

8 files changed, 32 insertions, 7 deletions

diff --git a/pkg/report/testdata/linux/report/123 b/pkg/report/testdata/linux/report/123
index 1a88faa4e..b9e6a16d9 100644
--- a/pkg/report/testdata/linux/report/123
+++ b/pkg/report/testdata/linux/report/123
@@ -1,4 +1,4 @@
-TITLE: INFO: Freed in fasync_free_rcu age=624 cpu=0 pid=3
+TITLE: INFO: Freed in fasync_free_rcu age=NUM cpu=NUM pid=NUM
 CORRUPTED: Y
 
 [   60.089581] ==================================================================
diff --git a/pkg/report/testdata/linux/report/124 b/pkg/report/testdata/linux/report/124
index 920440657..f160a4262 100644
--- a/pkg/report/testdata/linux/report/124
+++ b/pkg/report/testdata/linux/report/124
@@ -1,4 +1,4 @@
-TITLE: INFO: Allocated in fasync_helper age=1 cpu=1 pid=6024
+TITLE: INFO: Allocated in fasync_helper age=NUM cpu=NUM pid=NUM
 CORRUPTED: Y
 
 ** 4491 printk messages dropped ** [   50.750742] INFO: Allocated in fasync_helper+0x29/0x90 age=1 cpu=1 pid=6024
diff --git a/pkg/report/testdata/linux/report/132 b/pkg/report/testdata/linux/report/132
index a3c76cc12..d5b86a880 100644
--- a/pkg/report/testdata/linux/report/132
+++ b/pkg/report/testdata/linux/report/132
@@ -1,4 +1,4 @@
-TITLE: INFO: Freed in fasync_free_rcu age=57 cpu=0 pid=NUM
+TITLE: INFO: Freed in fasync_free_rcu age=NUM cpu=NUM pid=NUM
 CORRUPTED: Y
 
 [   96.002194] nla_parse: 25 callbacks suppressed
diff --git a/pkg/report/testdata/linux/report/133 b/pkg/report/testdata/linux/report/133
index d15e7574a..fb2e671e3 100644
--- a/pkg/report/testdata/linux/report/133
+++ b/pkg/report/testdata/linux/report/133
@@ -1,4 +1,4 @@
-TITLE: INFO: Allocated in fasync_helper age=1 cpu=1 pid=6024
+TITLE: INFO: Allocated in fasync_helper age=NUM cpu=NUM pid=NUM
 CORRUPTED: Y
 
 [   50.636894] audit_printk_skb: 210 callbacks suppressed
diff --git a/pkg/report/testdata/linux/report/355 b/pkg/report/testdata/linux/report/355
index 3a62468d9..3e93ae186 100644
--- a/pkg/report/testdata/linux/report/355
+++ b/pkg/report/testdata/linux/report/355
@@ -1,4 +1,4 @@
-TITLE: trusty: panic: failed(-5) to start app 6
+TITLE: trusty: panic: failed(-NUM) to start app NUM
 
 [ 1108.135767] trusty: pte_t *arm64_mmu_get_page_table(vaddr_t, uint, pte_t *)[ 1108.143812] trusty: :274: failed to allocate page table
 [ 1108.144338] trusty: pte_t *arm64_mmu_get_page_table(vaddr_t, uint, pte_t *):274: failed to allocate page table
diff --git a/pkg/report/testdata/linux/report/578 b/pkg/report/testdata/linux/report/578
index eb2dfeb0f..c5dd97194 100644
--- a/pkg/report/testdata/linux/report/578
+++ b/pkg/report/testdata/linux/report/578
@@ -1,5 +1,5 @@
 TITLE: kernel BUG in free_netdev
-ALT: kernel BUG at net/core/dev.c:NUM!
+ALT: kernel BUG at net/core/dev.c:LINE!
 
 [  429.970583][T14786] ------------[ cut here ]------------
 [  430.011828][T14786] kernel BUG at net/core/dev.c:10648!
diff --git a/pkg/report/testdata/linux/report/617 b/pkg/report/testdata/linux/report/617
new file mode 100644
index 000000000..7991cc54e
--- /dev/null
+++ b/pkg/report/testdata/linux/report/617
@@ -0,0 +1,25 @@
+TITLE: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM)
+CORRUPTED: N
+
+
+[    7.588873][    T1] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
+[    7.591093][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.13.0-syzkaller #0
+[    7.592511][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[    7.594827][    T1] Call Trace:
+[    7.595731][    T1]  dump_stack_lvl+0xcd/0x134
+[    7.596755][    T1]  panic+0x306/0x73d
+[    7.597535][    T1]  ? __warn_printk+0xf3/0xf3
+[    7.598935][    T1]  mount_block_root+0x3f8/0x4dd
+[    7.600581][    T1]  ? init_rootfs+0x59/0x59
+[    7.601603][    T1]  ? memcpy+0x39/0x60
+[    7.602547][    T1]  mount_root+0x1af/0x1f5
+[    7.603323][    T1]  ? mount_block_root+0x4dd/0x4dd
+[    7.604170][    T1]  ? memcpy+0x39/0x60
+[    7.605058][    T1]  prepare_namespace+0x1ff/0x234
+[    7.606115][    T1]  kernel_init_freeable+0x71f/0x737
+[    7.607467][    T1]  ? rest_init+0x400/0x400
+[    7.609009][    T1]  kernel_init+0x1a/0x1d0
+[    7.610261][    T1]  ? rest_init+0x400/0x400
+[    7.611325][    T1]  ret_from_fork+0x1f/0x30
+[    7.614266][    T1] Kernel Offset: disabled
+[    7.615575][    T1] Rebooting in 86400 seconds..
\ No newline at end of file
diff --git a/pkg/report/testdata/linux/report/79 b/pkg/report/testdata/linux/report/79
index 025b95ec5..9e97b9dc3 100644
--- a/pkg/report/testdata/linux/report/79
+++ b/pkg/report/testdata/linux/report/79
@@ -1,4 +1,4 @@
-TITLE: KASAN: use-after-free in do_con_write.part.23 at addr ADDR
+TITLE: KASAN: use-after-free in do_con_write.part.NUM at addr ADDR
 CORRUPTED: Y
 
 [  374.860710] BUG: KASAN: use-after-free in do_con_write.part.23+0x1c50/0x1cb0 at addr ffff88000012c43a