Date: Tue, 31 Dec 2013 21:59:36 GMT From: "R. Tyler Croy" <tyler@monkeypox.org> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/185374: Unmounting msdos filesystem in a bad state causes kernel panic Message-ID: <201312312159.rBVLxa0B038038@oldred.freebsd.org> Resent-Message-ID: <201312312200.rBVM00ac082234@freefall.freebsd.org>
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>Number: 185374 >Category: kern >Synopsis: Unmounting msdos filesystem in a bad state causes kernel panic >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Dec 31 22:00:00 UTC 2013 >Closed-Date: >Last-Modified: >Originator: R. Tyler Croy >Release: 10.0-PRERELEASE >Organization: n/a >Environment: FreeBSD kiwi 10.0-PRERELEASE FreeBSD 10.0-PRERELEASE #6 r259920: Thu Dec 26 12:14:47 PST 2013 root@kiwi:/usr/obj/usr/src/sys/KIWI amd64 >Description: I was attempting to unmount an msdosfs filesystem that I had attempted to fill up and card looks corrupted, see: g_vfs_done() errors below: Dec 31 12:28:34 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=794335232, length=65536)]error = 5 Dec 31 12:28:34 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=794400768, length=65536)]error = 5 Dec 31 12:28:34 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=794466304, length=65536)]error = 5 Dec 31 12:28:34 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=794531840, length=65536)]error = 5 Dec 31 12:28:34 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=794597376, length=40960)]error = 5 Dec 31 12:28:34 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=794703872, length=65536)]error = 5 Dec 31 12:28:34 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=794769408, length=65536)]error = 5 Dec 31 12:28:34 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=794834944, length=65536)]error = 5 The first time around, I attempted to umount(1) the SD card, and was giving a "resource unavailable" error (the exact string I cannot remember). Being a typical user, I added the -f (force) flag and that caused my machine to kernel panic with the following: Dec 31 10:11:31 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=792348672, length=4096)]error = 5 Dec 31 10:11:31 kiwi kernel: fsync: giving up on dirty Dec 31 10:11:31 kiwi kernel: 0xfffff801994a5b10: tag msdosfs, type VREG Dec 31 10:11:31 kiwi kernel: usecount 0, writecount 0, refcount 27537 mountedhere 0 Dec 31 10:11:31 kiwi kernel: flags (VI_DOOMED|VI_ACTIVE) Dec 31 10:11:31 kiwi kernel: v_object 0xfffff80147804900 ref 0 pages 27535 cleanbuf 6752 dirtybuf 20783 Dec 31 10:11:31 kiwi kernel: lock type msdosfs: EXCL by thread 0xfffff801c572b920 (pid 65381, umount, tid 101016) Dec 31 10:11:31 kiwi kernel: startcluster 187393, dircluster 3, diroffset 192, on dev da1s1 Dec 31 10:11:31 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=769116160, length=4096)]error = 5 Dec 31 10:11:31 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=769120256, length=4096)]error = 5 Dec 31 10:11:31 kiwi kernel: fsync: giving up on dirty Dec 31 10:11:31 kiwi kernel: 0xfffff801624c71d8: tag devfs, type VCHR Dec 31 10:11:31 kiwi kernel: usecount 1, writecount 0, refcount 414 mountedhere 0xfffff801557f3600 Dec 31 10:11:31 kiwi kernel: flags (VI_ACTIVE) Dec 31 10:11:31 kiwi kernel: v_object 0xfffff80133e68d00 ref 0 pages 446 cleanbuf 2 dirtybuf 410 Dec 31 10:11:31 kiwi kernel: lock type devfs: EXCL by thread 0xfffff801c572b920 (pid 65381, umount, tid 101016) Dec 31 10:11:31 kiwi kernel: dev da1s1 Dec 31 10:11:31 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=769116160, length=4096)]error = 5 Dec 31 10:11:31 kiwi kernel: g_vfs_done():da1s1[WRITE(offset=769120256, length=4096)]error = 5 Dec 31 10:11:31 kiwi kernel: fsync: giving up on dirty Dec 31 10:11:31 kiwi kernel: 0xfffff801624c71d8: tag devfs, type VCHR Dec 31 10:11:31 kiwi kernel: usecount 1, writecount 0, refcount 414 mountedhere 0xfffff801557f3600 Dec 31 10:11:31 kiwi kernel: flags (VI_ACTIVE) Dec 31 10:11:31 kiwi kernel: v_object 0xfffff80133e68d00 ref 0 pages 446 cleanbuf 2 dirtybuf 410 Dec 31 10:11:31 kiwi kernel: lock type devfs: UNLOCKED Dec 31 10:11:31 kiwi kernel: dev da1s1 Dec 31 10:13:31 kiwi syslogd: kernel boot file is /boot/kernel/kernel Dec 31 10:13:31 kiwi kernel: Dec 31 10:13:31 kiwi kernel: Dec 31 10:13:31 kiwi kernel: Fatal trap 9: general protection fault while in kernel mode Dec 31 10:13:31 kiwi kernel: cpuid = 0; apic id = 00 Dec 31 10:13:31 kiwi kernel: instruction pointer = 0x20:0xffffffff805a3d7d Dec 31 10:13:31 kiwi kernel: stack pointer = 0x28:0xfffffe0234150970 Dec 31 10:13:31 kiwi kernel: frame pointer = 0x28:0xfffffe02341509b0 Dec 31 10:13:31 kiwi kernel: code segment = base 0x0, limit 0xfffff, type 0x1b Dec 31 10:13:31 kiwi kernel: = DPL 0, pres 1, long 1, def32 0, gran 1 Dec 31 10:13:31 kiwi kernel: processor eflags = interrupt enabled, resume, IOPL = 0 Dec 31 10:13:31 kiwi kernel: current process = 19 (syncer) Dec 31 10:13:31 kiwi kernel: trap number = 9 Dec 31 10:13:31 kiwi kernel: panic: general protection fault Dec 31 10:13:31 kiwi kernel: cpuid = 0 Dec 31 10:13:31 kiwi kernel: KDB: stack backtrace: Dec 31 10:13:31 kiwi kernel: #0 0xffffffff8066c5e0 at kdb_backtrace+0x60 Dec 31 10:13:31 kiwi kernel: #1 0xffffffff80634035 at panic+0x155 Dec 31 10:13:31 kiwi kernel: #2 0xffffffff808cde22 at trap_fatal+0x3a2 Dec 31 10:13:31 kiwi kernel: #3 0xffffffff808cda5f at trap+0x7bf Dec 31 10:13:31 kiwi kernel: #4 0xffffffff808b4b22 at calltrap+0x8 Dec 31 10:13:31 kiwi kernel: #5 0xffffffff806b4633 at bufwrite+0x143 Dec 31 10:13:31 kiwi kernel: #6 0xffffffff806c06ce at vop_stdfsync+0x22e Dec 31 10:13:31 kiwi kernel: #7 0xffffffff8052fae6 at devfs_fsync+0x26 Dec 31 10:13:31 kiwi kernel: #8 0xffffffff80963698 at VOP_FSYNC_APV+0x98 Dec 31 10:13:31 kiwi kernel: #9 0xffffffff806d304a at sched_sync+0x3ca Dec 31 10:13:31 kiwi kernel: #10 0xffffffff8060610a at fork_exit+0x9a Dec 31 10:13:31 kiwi kernel: #11 0xffffffff808b505e at fork_trampoline+0xe Dec 31 10:13:31 kiwi kernel: Uptime: 3d2h58m33s Dec 31 10:13:31 kiwi kernel: Automatic reboot in 15 seconds - press a key on the console to abort Dec 31 10:13:31 kiwi kernel: --> Press a key on the console to reboot, Dec 31 10:13:31 kiwi kernel: --> or switch off the system now. Dec 31 10:13:31 kiwi kernel: Rebooting... >How-To-Repeat: I was able to reproduce a crash, but without the same stack backtrace as above by: 1. Inserting SD card 2. Mounting 3. Writing a file to it that would exceed disk capacity (dd if=/dev/random of=/mnt/card/garbage.bin bs=1M count=1024) 4. Watch g_vfs_done() errors spew in /var/log/messages in a seeming infinite loop 5. Attempt to unmount the device 6. Crash >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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