pkg/report: ignore ref_tracker frames

ref_tracker is a generic debugging facility,
the actual bug is (almost always) in the caller.

4 files changed, 188 insertions, 0 deletions

diff --git a/pkg/report/testdata/linux/guilty/52 b/pkg/report/testdata/linux/guilty/52
new file mode 100644
index 000000000..afd4f4954
--- /dev/null
+++ b/pkg/report/testdata/linux/guilty/52
@@ -0,0 +1,34 @@
+FILE: net/core/net_namespace.c
+
+------------[ cut here ]------------
+WARNING: CPU: 1 PID: 981 at lib/ref_tracker.c:38 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
+WARNING: CPU: 1 PID: 981 at lib/ref_tracker.c:38 ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:37
+Modules linked in:
+CPU: 1 PID: 981 Comm: kworker/u4:5 Not tainted 5.16.0-rc7-syzkaller #0
+Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+Workqueue: netns cleanup_net
+RIP: 0010:ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:38
+Code: 4c 89 ef e8 27 29 aa f8 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 c2 b9 62 f8 48 8b 74 24 10 4c 89 e7 e8 25 15 36 00 <0f> 0b e9 91 40 e9 fa 4c 89 ff e8 f6 28 aa f8 e9 d4 fe ff ff e8 dc
+RSP: 0018:ffffc90004897970 EFLAGS: 00010246
+RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
+RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001
+RBP: ffff88806ec6e600 R08: 0000000000000001 R09: ffffffff8ff9ba0f
+R10: 0000000000000001 R11: 0000000000000001 R12: ffff88806ec6e5b8
+R13: ffff88806ec6e600 R14: ffff88806ec6e600 R15: ffff88806ec6e600
+FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
+CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+CR2: 00007f507edcd370 CR3: 000000000b88e000 CR4: 00000000003506e0
+DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
+DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
+Call Trace:
+ <TASK>
+ free_netdev+0x32a/0x5b0 net/core/dev.c:10280
+ netdev_run_todo+0x8a0/0xaa0 net/core/dev.c:9957
+ default_device_exit_batch+0x2ff/0x3c0 net/core/dev.c:10938
+ ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
+ cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595
+ process_one_work+0x9b2/0x1660 kernel/workqueue.c:2298
+ worker_thread+0x65d/0x1130 kernel/workqueue.c:2445
+ kthread+0x405/0x4f0 kernel/kthread.c:327
+ ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
+ </TASK>
diff --git a/pkg/report/testdata/linux/guilty/53 b/pkg/report/testdata/linux/guilty/53
new file mode 100644
index 000000000..d25be4ac5
--- /dev/null
+++ b/pkg/report/testdata/linux/guilty/53
@@ -0,0 +1,49 @@
+FILE: net/packet/af_packet.c
+
+------------[ cut here ]------------
+WARNING: CPU: 1 PID: 3598 at lib/ref_tracker.c:120 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
+WARNING: CPU: 1 PID: 3598 at lib/ref_tracker.c:120 ref_tracker_free.cold+0x110/0x14e lib/ref_tracker.c:119
+Modules linked in:
+CPU: 1 PID: 3598 Comm: syz-executor840 Not tainted 5.16.0-rc7-syzkaller #0
+Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+RIP: 0010:ref_tracker_free.cold+0x110/0x14e lib/ref_tracker.c:120
+Code: ea 03 48 c1 e0 2a 0f b6 04 02 84 c0 74 04 3c 03 7e 4c 8b 7b 18 e8 39 67 e9 fa e8 04 e8 62 f8 4c 89 ee 48 89 ef e8 39 11 36 00 <0f> 0b 41 bd ea ff ff ff e9 8b 73 e9 fa 4c 89 f7 e8 74 57 aa f8 e9
+RSP: 0018:ffffc9000276fb08 EFLAGS: 00010282
+RAX: 0000000080000001 RBX: ffff888014ffe080 RCX: 0000000000000000
+RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000001
+RBP: ffff888141bb05b8 R08: 0000000000000001 R09: ffffffff8ff9bac7
+R10: 0000000000000001 R11: 0000000000000000 R12: 1ffff920004edf63
+R13: 0000000000000292 R14: ffff888014ffe098 R15: 00000000fa60013b
+FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
+CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+CR2: 00007f586c8c2e08 CR3: 000000000b88e000 CR4: 00000000003506e0
+DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
+DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
+Call Trace:
+ <TASK>
+ netdev_tracker_free include/linux/netdevice.h:3863 [inline]
+ dev_put_track include/linux/netdevice.h:3880 [inline]
+ dev_put_track include/linux/netdevice.h:3876 [inline]
+ packet_release+0x382/0xd00 net/packet/af_packet.c:3113
+ __sock_release+0xcd/0x280 net/socket.c:650
+ sock_close+0x18/0x20 net/socket.c:1315
+ __fput+0x286/0x9f0 fs/file_table.c:280
+ task_work_run+0xdd/0x1a0 kernel/task_work.c:164
+ exit_task_work include/linux/task_work.h:32 [inline]
+ do_exit+0xc14/0x2b40 kernel/exit.c:832
+ do_group_exit+0x125/0x310 kernel/exit.c:929
+ __do_sys_exit_group kernel/exit.c:940 [inline]
+ __se_sys_exit_group kernel/exit.c:938 [inline]
+ __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:938
+ do_syscall_x64 arch/x86/entry/common.c:50 [inline]
+ do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
+ entry_SYSCALL_64_after_hwframe+0x44/0xae
+RIP: 0033:0x7f586c87ece9
+Code: Unable to access opcode bytes at RIP 0x7f586c87ecbf.
+RSP: 002b:00007ffddce50a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
+RAX: ffffffffffffffda RBX: 00007f586c8f2270 RCX: 00007f586c87ece9
+RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
+RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
+R10: 0000000000000000 R11: 0000000000000246 R12: 00007f586c8f2270
+R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
+ </TASK>
diff --git a/pkg/report/testdata/linux/report/639 b/pkg/report/testdata/linux/report/639
new file mode 100644
index 000000000..08da0b161
--- /dev/null
+++ b/pkg/report/testdata/linux/report/639
@@ -0,0 +1,64 @@
+TITLE: WARNING in free_netdev
+
+[  582.890557][  T981] ------------[ cut here ]------------
+[  582.907452][  T981] WARNING: CPU: 1 PID: 981 at lib/ref_tracker.c:38 ref_tracker_dir_exit.cold+0x137/0x1e3
+[  582.923415][  T981] Modules linked in:
+[  582.945529][  T981] CPU: 1 PID: 981 Comm: kworker/u4:5 Not tainted 5.16.0-rc7-syzkaller #0
+[  582.954023][  T981] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[  582.989367][  T981] Workqueue: netns cleanup_net
+[  582.994171][  T981] RIP: 0010:ref_tracker_dir_exit.cold+0x137/0x1e3
+[  583.034829][  T981] Code: 4c 89 ef e8 27 29 aa f8 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 c2 b9 62 f8 48 8b 74 24 10 4c 89 e7 e8 25 15 36 00 <0f> 0b e9 91 40 e9 fa 4c 89 ff e8 f6 28 aa f8 e9 d4 fe ff ff e8 dc
+[  583.063642][  T981] RSP: 0018:ffffc90004897970 EFLAGS: 00010246
+[  583.071448][  T981] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
+[  583.116543][  T981] RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001
+[  583.124638][  T981] RBP: ffff88806ec6e600 R08: 0000000000000001 R09: ffffffff8ff9ba0f
+[  583.184822][  T981] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88806ec6e5b8
+[  583.236536][  T981] R13: ffff88806ec6e600 R14: ffff88806ec6e600 R15: ffff88806ec6e600
+[  583.244547][  T981] FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
+[  583.267265][  T981] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+[  583.313964][  T981] CR2: 00007f507edcd370 CR3: 000000000b88e000 CR4: 00000000003506e0
+[  583.354853][  T981] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
+[  583.387245][  T981] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
+[  583.428985][  T981] Call Trace:
+[  583.438690][  T981]  <TASK>
+[  583.453571][  T981]  free_netdev+0x32a/0x5b0
+[  583.470555][  T981]  netdev_run_todo+0x8a0/0xaa0
+[  583.570864][  T981]  default_device_exit_batch+0x2ff/0x3c0
+[  583.719434][  T981]  ops_exit_list+0x10d/0x160
+[  583.744036][  T981]  cleanup_net+0x4ea/0xb00
+[  583.779533][  T981]  process_one_work+0x9b2/0x1660
+[  583.864495][  T981]  worker_thread+0x65d/0x1130
+[  583.912736][  T981]  kthread+0x405/0x4f0
+[  583.968596][  T981]  ret_from_fork+0x1f/0x30
+[  583.981013][  T981]  </TASK>
+[  583.994730][  T981] Kernel panic - not syncing: panic_on_warn set ...
+[  584.001329][  T981] CPU: 0 PID: 981 Comm: kworker/u4:5 Not tainted 5.16.0-rc7-syzkaller #0
+[  584.009751][  T981] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[  584.019818][  T981] Workqueue: netns cleanup_net
+[  584.024599][  T981] Call Trace:
+[  584.027883][  T981]  <TASK>
+[  584.030820][  T981]  dump_stack_lvl+0xcd/0x134
+[  584.035427][  T981]  panic+0x2b0/0x6dd
+[  584.054713][  T981]  __warn.cold+0x35/0x44
+[  584.064804][  T981]  report_bug+0x1bd/0x210
+[  584.069232][  T981]  handle_bug+0x3c/0x60
+[  584.073454][  T981]  exc_invalid_op+0x14/0x40
+[  584.077977][  T981]  asm_exc_invalid_op+0x12/0x20
+[  584.082842][  T981] RIP: 0010:ref_tracker_dir_exit.cold+0x137/0x1e3
+[  584.089281][  T981] Code: 4c 89 ef e8 27 29 aa f8 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 c2 b9 62 f8 48 8b 74 24 10 4c 89 e7 e8 25 15 36 00 <0f> 0b e9 91 40 e9 fa 4c 89 ff e8 f6 28 aa f8 e9 d4 fe ff ff e8 dc
+[  584.108900][  T981] RSP: 0018:ffffc90004897970 EFLAGS: 00010246
+[  584.114981][  T981] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
+[  584.122964][  T981] RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001
+[  584.130944][  T981] RBP: ffff88806ec6e600 R08: 0000000000000001 R09: ffffffff8ff9ba0f
+[  584.138923][  T981] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88806ec6e5b8
+[  584.146908][  T981] R13: ffff88806ec6e600 R14: ffff88806ec6e600 R15: ffff88806ec6e600
+[  584.155270][  T981]  free_netdev+0x32a/0x5b0
+[  584.159721][  T981]  netdev_run_todo+0x8a0/0xaa0
+[  584.191050][  T981]  default_device_exit_batch+0x2ff/0x3c0
+[  584.223562][  T981]  ops_exit_list+0x10d/0x160
+[  584.228169][  T981]  cleanup_net+0x4ea/0xb00
+[  584.238180][  T981]  process_one_work+0x9b2/0x1660
+[  584.258899][  T981]  worker_thread+0x65d/0x1130
+[  584.268819][  T981]  kthread+0x405/0x4f0
+[  584.278143][  T981]  ret_from_fork+0x1f/0x30
+[  584.282605][  T981]  </TASK>
diff --git a/pkg/report/testdata/linux/report/640 b/pkg/report/testdata/linux/report/640
new file mode 100644
index 000000000..b4603b94f
--- /dev/null
+++ b/pkg/report/testdata/linux/report/640
@@ -0,0 +1,41 @@
+TITLE: WARNING in packet_release
+
+[   51.810488][ T3598] ------------[ cut here ]------------
+[   51.816094][ T3598] WARNING: CPU: 1 PID: 3598 at lib/ref_tracker.c:120 ref_tracker_free.cold+0x110/0x14e
+[   51.825792][ T3598] Modules linked in:
+[   51.829691][ T3598] CPU: 1 PID: 3598 Comm: syz-executor840 Not tainted 5.16.0-rc7-syzkaller #0
+[   51.838549][ T3598] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[   51.848656][ T3598] RIP: 0010:ref_tracker_free.cold+0x110/0x14e
+[   51.854779][ T3598] Code: ea 03 48 c1 e0 2a 0f b6 04 02 84 c0 74 04 3c 03 7e 4c 8b 7b 18 e8 39 67 e9 fa e8 04 e8 62 f8 4c 89 ee 48 89 ef e8 39 11 36 00 <0f> 0b 41 bd ea ff ff ff e9 8b 73 e9 fa 4c 89 f7 e8 74 57 aa f8 e9
+[   51.874455][ T3598] RSP: 0018:ffffc9000276fb08 EFLAGS: 00010282
+[   51.880561][ T3598] RAX: 0000000080000001 RBX: ffff888014ffe080 RCX: 0000000000000000
+[   51.888536][ T3598] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000001
+[   51.896607][ T3598] RBP: ffff888141bb05b8 R08: 0000000000000001 R09: ffffffff8ff9bac7
+[   51.904639][ T3598] R10: 0000000000000001 R11: 0000000000000000 R12: 1ffff920004edf63
+[   51.912661][ T3598] R13: 0000000000000292 R14: ffff888014ffe098 R15: 00000000fa60013b
+[   51.920795][ T3598] FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
+[   51.929842][ T3598] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+[   51.936543][ T3598] CR2: 00007f586c8c2e08 CR3: 000000000b88e000 CR4: 00000000003506e0
+[   51.944578][ T3598] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
+[   51.952650][ T3598] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
+[   51.960674][ T3598] Call Trace:
+[   51.963966][ T3598]  <TASK>
+[   52.030634][ T3598]  packet_release+0x382/0xd00
+[   52.060771][ T3598]  __sock_release+0xcd/0x280
+[   52.065375][ T3598]  sock_close+0x18/0x20
+[   52.069522][ T3598]  __fput+0x286/0x9f0
+[   52.078435][ T3598]  task_work_run+0xdd/0x1a0
+[   52.083061][ T3598]  do_exit+0xc14/0x2b40
+[   52.112396][ T3598]  do_group_exit+0x125/0x310
+[   52.116996][ T3598]  __x64_sys_exit_group+0x3a/0x50
+[   52.122066][ T3598]  do_syscall_64+0x35/0xb0
+[   52.126497][ T3598]  entry_SYSCALL_64_after_hwframe+0x44/0xae
+[   52.132447][ T3598] RIP: 0033:0x7f586c87ece9
+[   52.136865][ T3598] Code: Unable to access opcode bytes at RIP 0x7f586c87ecbf.
+[   52.144277][ T3598] RSP: 002b:00007ffddce50a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
+[   52.152733][ T3598] RAX: ffffffffffffffda RBX: 00007f586c8f2270 RCX: 00007f586c87ece9
+[   52.160740][ T3598] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
+[   52.168711][ T3598] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
+[   52.176834][ T3598] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f586c8f2270
+[   52.184831][ T3598] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
+[   52.192874][ T3598]  </TASK>