pkg/report: skip __might_resched frames

Not skipping this frame leads to "BUG: sleeping function called from
invalid context at" pointing to the wrong function.

Fix that and add a report parse test.

1 files changed, 59 insertions, 0 deletions

diff --git a/pkg/report/testdata/linux/report/628 b/pkg/report/testdata/linux/report/628
new file mode 100644
index 000000000..70978f254
--- /dev/null
+++ b/pkg/report/testdata/linux/report/628
@@ -0,0 +1,59 @@
+TITLE: BUG: sleeping function called from invalid context in console_lock
+
+[   74.488762][ T6529] BUG: sleeping function called from invalid context at kernel/printk/printk.c:2525
+[   74.498327][ T6529] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 6529, name: syz-executor925
+[   74.507803][ T6529] preempt_count: 1, expected: 0
+[   74.512654][ T6529] RCU nest depth: 0, expected: 0
+[   74.517593][ T6529] 3 locks held by syz-executor925/6529:
+[   74.523143][ T6529]  #0: ffff888018d79098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80
+[   74.532941][ T6529]  #1: ffff888018d79468 (&tty->flow.lock){....}-{2:2}, at: n_tty_ioctl_helper+0xb6/0x2d0
+[   74.542810][ T6529]  #2: ffff888018d79098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref+0x1d/0x80
+[   74.552163][ T6529] irq event stamp: 16252
+[   74.556406][ T6529] hardirqs last  enabled at (16251): [<ffffffff8952dbc0>] _raw_spin_unlock_irqrestore+0x50/0x70
+[   74.567006][ T6529] hardirqs last disabled at (16252): [<ffffffff8952d921>] _raw_spin_lock_irq+0x41/0x50
+[   74.576628][ T6529] softirqs last  enabled at (14452): [<ffffffff812bc45c>] fpu_flush_thread+0x23c/0x390
+[   74.586280][ T6529] softirqs last disabled at (14450): [<ffffffff812bc3eb>] fpu_flush_thread+0x1cb/0x390
+[   74.595981][ T6529] Preemption disabled at:
+[   74.595988][ T6529] [<0000000000000000>] 0x0
+[   74.604716][ T6529] CPU: 0 PID: 6529 Comm: syz-executor925 Not tainted 5.15.0-next-20211112-syzkaller #0
+[   74.614337][ T6529] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[   74.624374][ T6529] Call Trace:
+[   74.627650][ T6529]  <TASK>
+[   74.630578][ T6529]  dump_stack_lvl+0xcd/0x134
+[   74.635161][ T6529]  __might_resched.cold+0x222/0x26b
+[   74.640356][ T6529]  console_lock+0x17/0x80
+[   74.644671][ T6529]  do_con_write+0x10f/0x1e40
+[   74.649276][ T6529]  ? n_hdlc_buf_get+0x1a1/0x230
+[   74.654123][ T6529]  ? lock_downgrade+0x6e0/0x6e0
+[   74.659147][ T6529]  ? do_con_trol+0x54f0/0x54f0
+[   74.663893][ T6529]  ? n_hdlc_send_frames+0xf0/0x490
+[   74.668988][ T6529]  ? lock_downgrade+0x6e0/0x6e0
+[   74.673824][ T6529]  ? do_raw_spin_unlock+0x171/0x230
+[   74.679006][ T6529]  ? con_put_char+0xa0/0xa0
+[   74.683493][ T6529]  con_write+0x21/0x40
+[   74.687636][ T6529]  n_hdlc_send_frames+0x24b/0x490
+[   74.692650][ T6529]  ? n_hdlc_send_frames+0x490/0x490
+[   74.697833][ T6529]  tty_wakeup+0xe1/0x120
+[   74.702058][ T6529]  ? lf+0x2c0/0x2c0
+[   74.705854][ T6529]  __start_tty+0xfb/0x130
+[   74.710164][ T6529]  n_tty_ioctl_helper+0x299/0x2d0
+[   74.715215][ T6529]  n_hdlc_tty_ioctl+0xd2/0x340
+[   74.719976][ T6529]  tty_ioctl+0xc69/0x1670
+[   74.724412][ T6529]  ? n_hdlc_tty_open+0x3f0/0x3f0
+[   74.729350][ T6529]  ? tty_lookup_driver+0x550/0x550
+[   74.734451][ T6529]  ? find_held_lock+0x2d/0x110
+[   74.739210][ T6529]  ? __context_tracking_exit+0xb8/0xe0
+[   74.744673][ T6529]  ? lock_downgrade+0x6e0/0x6e0
+[   74.749547][ T6529]  ? lock_downgrade+0x6e0/0x6e0
+[   74.754391][ T6529]  ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70
+[   74.760622][ T6529]  ? tty_lookup_driver+0x550/0x550
+[   74.765717][ T6529]  __x64_sys_ioctl+0x193/0x200
+[   74.770470][ T6529]  do_syscall_64+0x35/0xb0
+[   74.774875][ T6529]  entry_SYSCALL_64_after_hwframe+0x44/0xae
+[   74.780756][ T6529] RIP: 0033:0x7f16c8522349
+[   74.785153][ T6529] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
+[   74.804740][ T6529] RSP: 002b:00007fff6ccb8b98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
+[   74.813135][ T6529] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f16c8522349
+[   74.821088][ T6529] RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005
+[   74.829043][ T6529] RBP: 00007f16c84e61d0 R08: 0000000000000000 R09: 0000000000000000
+[   74.837027][ T6529] R10: 00000000000