Date: Sat, 20 Jan 2018 11:18:45 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 225339] psm: Panic when trying to scroll with an Elantech touchpad without a trackpoint, with EVDEV_SUPPORT Message-ID: <bug-225339-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225339 Bug ID: 225339 Summary: psm: Panic when trying to scroll with an Elantech touchpad without a trackpoint, with EVDEV_SUPPORT Product: Base System Version: 11.0-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: dumbbell@FreeBSD.org After fixing bug 225338 and enabling EVDEV_SUPPORT, I got a kernel panic when I tried to scroll with the Elantech touch of a Gigabyte Aero 15X laptop: #4 0xffffffff80a947b3 in panic (fmt=<unavailable>) at /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/kern/kern_shutdown.c:738 #5 0xffffffff80f3ff32 in trap_fatal (frame=0xfffffe0087dc2610, eva=328) at /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/amd64/amd64/trap.c:794 #6 0xffffffff80f3ffa2 in trap_pfault (frame=0xfffffe0087dc2610, usermode=0) at /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/amd64/amd64/trap.c:649 #7 0xffffffff80f3f772 in trap (frame=0xfffffe0087dc2610) at /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/amd64/amd64/trap.c:417 #8 <signal handler called> #9 0xffffffff8059e3d5 in bit_test (_bitstr=<optimized out>, _bit=<optimized out>) at /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/sys/bitstring.h:141 #10 evdev_event_supported (type=2, evdev=<optimized out>) at /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/dev/evdev/evdev.c:441 #11 evdev_check_event (type=2, code=0, evdev=<optimized out>, value=<optimized out>) at /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/dev/evdev/evdev.c:490 #12 evdev_push_event (evdev=0x0, type=2, code=0, value=-16) at /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/dev/evdev/evdev.c:764 #13 0xffffffff80f67546 in evdev_push_rel (evdev=<optimized out>, code=<optimized out>, value=<optimized out>) at /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/dev/evdev/evdev.h:172 #14 proc_elantech (pb=<optimized out>, sc=<optimized out>, ms=<optimized out>, x=<optimized out>, y=<optimized out>, z=<optimized out>) at /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/dev/atkbdc/psm.c:4512 The problem is that the packet was erroneously detected as a trackpoint packet, but the device has no trackpoint. We later want to emit an evdev event for this packet, but the associated relative evdev device (`evdev_r`) is not initialized, causing the panic. -- You are receiving this mail because: You are the assignee for the bug.
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