Re: kern/59497: Panic in ucompoll

["Paul Ripke via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR kern/59497; it has been noted by GNATS.

From: Paul Ripke <stix%stix.id.au@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/59497: Panic in ucompoll
Date: Sat, 5 Jul 2025 17:44:42 +1000

 Re msgbuf, after dumping it out, I realise this crash was actually due to
 a failing USB hub flaking out intermittently. I have seen this device
 intermittently disconnect/reconnect without that hub, so there's still
 something going on.
 
 [ 3804001.1947412] ukbd0: was console keyboard
 [ 3804001.1947412] wskbd0: detached
 [ 3804001.1987412] ukbd0: detached
 [ 3804001.1987412] uhidev0: detached
 [ 3804001.1987412] uhidev0: at uhub8 port 1 (addr 2) disconnected
 [ 3804001.1987412] wskbd2: disconnecting from wsdisplay0
 [ 3804001.1987412] wskbd2: detached
 [ 3804001.1987412] ukbd3: detached
 [ 3804001.2027413] wskbd1: disconnecting from wsdisplay0
 [ 3804001.2027413] wskbd1: detached
 [ 3804001.2027413] ukbd2: detached
 [ 3804001.2027413] ukbd1: detached
 [ 3804001.2027413] uhid2: detached
 [ 3804001.2027413] uhid1: detached
 [ 3804001.2027413] uhid0: detached
 [ 3804001.2027413] uhidev1: detached
 [ 3804001.2027413] uhidev1: at uhub8 port 1 (addr 2) disconnected
 [ 3804001.2117415] wsmouse0: detached
 [ 3804001.2117415] ums0: detached
 [ 3804001.2117415] uhidev2: detached
 [ 3804001.2117415] uhidev2: at uhub8 port 2 (addr 12) disconnected
 [ 3804001.2127414] uhid7: detached
 [ 3804001.2127414] uhid6: detached
 [ 3804001.2127414] uhid5: detached
 [ 3804001.2157415] wskbd3: disconnecting from wsdisplay0
 [ 3804001.2157415] wskbd3: detached
 [ 3804001.2157415] ukbd4: detached
 [ 3804001.2157415] uhidev4: detached
 [ 3804001.2157415] uhidev4: at uhub8 port 2 (addr 12) disconnected
 [ 3804001.2157415] uhidev5: detached
 [ 3804001.2157415] uhidev5: at uhub8 port 2 (addr 12) disconnected
 [ 3804001.2307417] ucom1: detached
 [ 3804001.2307417] uplcom0: detached
 [ 3804001.2307417] uplcom0: at uhub9 port 1 (addr 13) disconnected
 [ 3804001.2407419] ucom0: detached
 [ 3804001.2407419] umodem0: detached
 [ 3804001.2407419] umodem0: at uhub9 port 2 (addr 11) disconnected
 [ 3804001.2477419] uhub9: detached
 [ 3804001.2477419] uhub9: at uhub8 port 3 (addr 4) disconnected
 [ 3804001.2537420] uhub8: detached
 [ 3804001.2537420] uhub8: at uhub1 port 5 (addr 1) disconnected
 [ 3804001.7737508] uhub8 at uhub1 port 5: GenesysLogic (0x05e3) USB2.0 Hub (0x0610), class 9/0, rev 2.10/92.26, addr 14
 [ 3804001.7737508] uhub8: multiple transaction translators
 [ 3804001.7887511] uhub8: 4 ports with 1 removable, self powered
 [ 3804002.1207568] uvm_fault(0xffffb1c7ac104780, 0x0, 1) -> e
 [ 3804002.1207568] fatal page fault in supervisor mode
 [ 3804002.1207568] trap type 6 code 0 rip 0xffffffff804960cf cs 0x8 rflags 0x10246 cr2 0xe8 ilevel 0 rsp 0xffffb41236bc5bf0
 [ 3804002.1207568] curlwp 0xffffb1ca652e1340 pid 23833.26753 lowest kstack 0xffffb41236bc12c0
 [ 3804002.1207568] panic: trap
 [ 3804002.1207568] cpu1: Begin traceback...
 [ 3804002.1207568] vpanic() at netbsd:vpanic+0x183
 [ 3804002.1217568] panic() at netbsd:panic+0x3c
 [ 3804002.1227568] trap() at netbsd:trap+0xbaf
 [ 3804002.1227568] --- trap (number 6) ---
 [ 3804002.1227568] ucompoll() at netbsd:ucompoll+0x2a
 [ 3804002.1227568] cdev_poll() at netbsd:cdev_poll+0x87
 [ 3804002.1237565] spec_poll() at netbsd:spec_poll+0x6a
 [ 3804002.1237565] VOP_POLL() at netbsd:VOP_POLL+0x5d
 [ 3804002.1247569] sel_do_scan() at netbsd:sel_do_scan+0x3ba
 [ 3804002.1247569] selcommon() at netbsd:selcommon+0x309
 [ 3804002.1247569] sys___select50() at netbsd:sys___select50+0x75
 [ 3804002.1257569] syscall() at netbsd:syscall+0x1fc
 [ 3804002.1257569] --- syscall (number 417) ---
 [ 3804002.1257569] netbsd:syscall+0x1fc:
 [ 3804002.1257569] cpu1: End traceback...
 
 -- 
 Paul Ripke
 "Great minds discuss ideas, average minds discuss events, small minds
  discuss people."
 -- Disputed: Often attributed to Eleanor Roosevelt. 1948.