From: Blaisorblade <blaisorblade@yahoo.it>
To: Jeff Dike <jdike@addtoit.com>,
user-mode-linux-devel@lists.sourceforge.net
Subject: [uml-devel] uml_mconsole hotunplug crash
Date: Fri, 23 Dec 2005 22:51:47 +0100 [thread overview]
Message-ID: <200512232251.49006.blaisorblade@yahoo.it> (raw)
This is just to make this known - on 2.6.14.3-bs3 I did the following:
uml_mconsole umid
config ubd2=toms.cow
config ubd3=toms.cow2
remove ubd2
remove ubd3
this simple sequence leads to a kernel Oops. Complete output below (with
printk timestamping enabled, as you see :-( ).
(The first is another debug trace, already known)
Note that
[42949386.950000] Debug: sleeping function called from invalid context
at /home/paolo/Admin/kernel/6/VCS/linux-2.6.14/mm/slab.c:2459
[42949386.950000] in_atomic():1, irqs_disabled():0
[42949386.950000] a1fedefc: [<a0014672>] dump_stack+0x22/0x30
[42949386.950000] a1fedf1c: [<a003558c>] __might_sleep+0xac/0xd0
[42949386.950000] a1fedf3c: [<a006aa21>] __kmalloc+0xc1/0x110
[42949386.950000] a1fedf6c: [<a0011a39>] um_kmalloc+0x19/0x20
[42949386.950000] a1fedf7c: [<a001017d>] __wrap_malloc+0x2d/0x80
[42949386.950000] a1fedf8c: [<a01f6c59>] execvp+0x79/0x2b0
[42949386.950000] a1fedfbc: [<a000ed3f>] helper_child+0x2f/0xc0
[42949386.950000] a1fedfdc: [<a01f914a>] clone+0x6a/0x80
[42949386.950000]
[42949415.820000] ubdc: unknown partition table
[42949423.360000] ubdd: unknown partition table
[42949429.550000] ubdc: unknown partition table
[42949432.250000] ubdd: unknown partition table
(The additions - don't know why duplicated, I notice only now, maybe in this
time I played a bit more)
[42949436.050000] Kernel panic - not syncing: Segfault with no mm
[42949436.050000]
[42949436.050000] EIP: 0023:[<a01e0341>] CPU: 0 Not tainted ESP: 002b:40000fac
EFLAGS: 00000202
[42949436.050000] Not tainted
[42949436.050000] EAX: 00000000 EBX: 00003c02 ECX: 00000013 EDX: 00003c02
[42949436.050000] ESI: 00003bfc EDI: 00000000 EBP: 40000fb8 DS: 002b ES: 002b
[42949436.050000] a08ab2ac: [<a0032f7a>] show_regs+0x21a/0x230
[42949436.050000] a08ab2dc: [<a0016edc>] panic_exit+0x2c/0x50
[42949436.050000] a08ab2ec: [<a004ac85>] notifier_call_chain+0x25/0x40
[42949436.050000] a08ab30c: [<a0037c01>] panic+0x71/0x100
[42949436.050000] a08ab32c: [<a00162c5>] segv+0x285/0x2f0
[42949436.050000] a08ab41c: [<a001660e>] segv_handler+0x9e/0x100
[42949436.050000] a08ab44c: [<a001d1a2>] sig_handler_common_skas+0xf2/0x130
[42949436.050000] a08ab47c: [<a002c1b3>] sig_handler+0x33/0x40
[42949436.050000] a08ab48c: [<ffffe500>] _etext+0x5fdd0b4a/0x0
[42949436.050000] a08ab7ec: [<a0149c9c>] kobject_unregister+0x2c/0x50
[42949436.050000] a08ab80c: [<a016184c>] elv_unregister_queue+0x1c/0x30
[42949436.050000] a08ab81c: [<a01669cd>] blk_unregister_queue+0x2d/0x60
[42949436.050000] a08ab83c: [<a0167f72>] unlink_gendisk+0x12/0x30
[42949436.050000] a08ab85c: [<a00ba52e>] del_gendisk+0x5e/0x110
[42949436.050000] a08ab87c: [<a0026948>] ubd_remove+0x58/0x130
[42949436.050000] a08ab9dc: [<a0024ff2>] mconsole_remove+0x152/0x180
[42949436.050000] a08abb1c: [<a002450c>] mc_work_proc+0x4c/0x70
[42949436.050000] a08abb2c: [<a004edde>] worker_thread+0x21e/0x2f0
[42949436.050000] a08abbdc: [<a00531da>] kthread+0xaa/0xe0
[42949436.050000] a08abc1c: [<a002c169>] run_kernel_thread+0x39/0x50
[42949436.050000] a08abcdc: [<a001c7b4>] new_thread_handler+0xc4/0x120
[42949436.050000] a08abd1c: [<ffffe500>] _etext+0x5fdd0b4a/0x0
[42949436.050000]
[42949436.050000] * route del -host 192.168.0.6 dev tap1
[42949436.050000] * bash -c echo 0 > /proc/sys/net/ipv4/conf/tap1/proxy_arp
[42949436.050000] * arp -i eth0 -d 192.168.0.6 pub
deactivate_all_fds failed, errno = 9
--
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade
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