pkg/report: improve report titles

1. Replace stacktraceRe with custom code which is more flexible.
stacktraceRe stumbled on any unrelated lines and
could not properly parse truncated stacks.

2. Match report regexp earlier.
If we match simler title regexp, but don't match
report regexp or fail to parse stack trace, the report is corrupted.
This eliminates lots of duplicate corrupted oops entries,
which were there only because we had complex regexp's in titles.

3. Ignore low-level frames during stack parsing.
E.g. we never want to report a GPF in lock_acquire or memcpy
(somewhat similar to what we do for guilty files).

4. Add a bunch of specialized formats for WARNINGs.
There is number of generic debugging facilities (like ODEBUG,
debug usercopy, kobject, refcount_t, etc), and the bug
is never in these facilities, it's in the caller instead.

5. Improve some other oops formats.

6. Add a bunch of additional tests.

This resolves most of TODOs in tests.
Fixes #515

1 files changed, 57 insertions, 0 deletions

diff --git a/pkg/report/testdata/linux/guilty/32 b/pkg/report/testdata/linux/guilty/32
new file mode 100644
index 000000000..15420b982
--- /dev/null
+++ b/pkg/report/testdata/linux/guilty/32
@@ -0,0 +1,57 @@
+FILE: net/tipc/name_table.c
+
+list_del corruption. prev->next should be 00000000bc6553ca, but was 0000000038fa8131
+------------[ cut here ]------------
+kernel BUG at lib/list_debug.c:53!
+invalid opcode: 0000 [#1] SMP KASAN
+Dumping ftrace buffer:
+   (ftrace buffer empty)
+Modules linked in:
+CPU: 1 PID: 3200 Comm: syz-executor4 Not tainted 4.15.0-rc8+ #264
+Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+RIP: 0010:__list_del_entry_valid+0xef/0x150 lib/list_debug.c:51
+RSP: 0018:ffff8801be95eb20 EFLAGS: 00010286
+RAX: 0000000000000054 RBX: ffff8801d359f240 RCX: 0000000000000000
+RDX: 0000000000000054 RSI: 1ffff10039af2dca RDI: ffffed0037d2bd58
+RBP: ffff8801be95eb38 R08: 1ffff10037d2bcfc R09: 0000000000000000
+R10: ffff8801be95ea00 R11: 0000000000000000 R12: ffff8801d50e4900
+R13: ffff8801be95ecd8 R14: ffff8801c29ac860 R15: ffff8801bd76aa80
+FS:  00007f70eee26700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
+CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+CR2: 00000000010bad18 CR3: 0000000006822006 CR4: 00000000001606e0
+Call Trace:
+ __list_del_entry include/linux/list.h:117 [inline]
+ list_del_init include/linux/list.h:159 [inline]
+ tipc_nametbl_unsubscribe+0x318/0x990 net/tipc/name_table.c:851
+ tipc_subscrb_subscrp_delete+0x1e9/0x460 net/tipc/subscr.c:208
+ tipc_subscrb_delete net/tipc/subscr.c:238 [inline]
+ tipc_subscrb_release_cb+0x17/0x30 net/tipc/subscr.c:316
+ tipc_close_conn+0x171/0x270 net/tipc/server.c:204
+ tipc_topsrv_kern_unsubscr+0x213/0x340 net/tipc/server.c:532
+ tipc_group_delete+0x2c0/0x3d0 net/tipc/group.c:206
+ tipc_sk_leave+0x10b/0x200 net/tipc/socket.c:2780
+ tipc_release+0x154/0xfe0 net/tipc/socket.c:575
+ sock_release+0x8d/0x1e0 net/socket.c:602
+ sock_close+0x16/0x20 net/socket.c:1131
+ __fput+0x327/0x7e0 fs/file_table.c:210
+ ____fput+0x15/0x20 fs/file_table.c:244
+ task_work_run+0x199/0x270 kernel/task_work.c:113
+ exit_task_work include/linux/task_work.h:22 [inline]
+ do_exit+0x9bb/0x1ad0 kernel/exit.c:865
+ do_group_exit+0x149/0x400 kernel/exit.c:968
+ get_signal+0x73f/0x16c0 kernel/signal.c:2335
+ do_signal+0x90/0x1eb0 arch/x86/kernel/signal.c:809
+ exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
+ prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
+ syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
+ entry_SYSCALL_64_fastpath+0x9e/0xa0
+RIP: 0033:0x452df9
+RSP: 002b:00007f70eee25c88 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
+RAX: 0000000000000001 RBX: 000000000071bea0 RCX: 0000000000452df9
+RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000071becc
+RBP: 0000000000000573 R08: 0000000000000000 R09: 0000000000000000
+R10: 0000000000000010 R11: 0000000000000246 R12: 0000000000000001
+R13: 0000000000000014 R14: 00007f70eee266d4 R15: ffffffffffffffff
+Code: 4c 89 e2 48 c7 c7 c0 fb e0 85 e8 95 26 fe fe 0f 0b 48 c7 c7 20 fc e0 85 e8 87 26 fe fe 0f 0b 48 c7 c7 80 fc e0 85 e8 79 26 fe fe <0f> 0b 48 c7 c7 e0 fc e0 85 e8 6b 26 fe fe 0f 0b 48 89 df 48 89 
+RIP: __list_del_entry_valid+0xef/0x150 lib/list_debug.c:51 RSP: ffff8801be95eb20
+---[ end trace 0c495e0cee371de9 ]---