Bug#645071: linux-image-2.6.32-5-686-bigmem: init crashes during runlevel switch
2011/10/13 Ben Hutchings <ben@decadent.org.uk>:
> On Wed, 2011-10-12 at 14:05 +0300, Matrosov Dmitriy wrote:
>> Package: linux-2.6
>> Version: 2.6.32-38
>> Severity: normal
>> Tags: squeeze
>>
>> Steps to reproduce:
>> 1. Reboot computer.
>> 2. Boot into runlevel 2.
>> 3. Switch to console and go to single-user runlevel:
>> # telinit 1
>> 4. Enter root password and switch to runlevel 2 again:
>> # telinit 2
>> 5. And now, as i understand, second init copy (which run by telinit) will
>> crash.
>>
>> I can't reproduce this again without rebooting system, i.e. it occurs only
>> after reboot and only once.
>> Also, i can't reproduce this with previous kernel (=2.6.32-35squeeze2), and,
>> though, i don't sure that this is kernel bug, but it seems, like last kernel
>> upgrade (=2.6.32-38) triggers it.
>
> This isn't a crash.
>
> [...]
>> [ 75.608119] ------------[ cut here ]------------
>> [ 75.608136] WARNING: at /build/buildd-linux-2.6_2.6.32-38-i386-G9QRBd/linux-2.6-2.6.32/debian/build/source_i386_none/drivers/char/tty_ldisc.c:738 tty_ldisc_reinit+0x3e/0x6c()
>> [ 75.608144] Hardware name: 6460EDG
>> [ 75.608148] Modules linked in: acpi_cpufreq cpufreq_stats cpufreq_powersave cpufreq_conservative cpufreq_userspace pppoe pppox ppp_generic slhc binfmt_misc uinput fuse ipt_REJECT ipt_LOG xt_limit xt_tcpudp xt_state iptable_filter ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_mangle ip_tables x_tables ext3 jbd ext2 tp_smapi thinkpad_ec loop firewire_sbp2 snd_hda_codec_analog btusb snd_hda_intel bluetooth arc4 snd_hda_codec sg snd_hwdep ecb iwlagn snd_pcm nouveau iwlcore sr_mod sdhci_pci sdhci ttm snd_seq mac80211 snd_timer firewire_ohci cdrom drm_kms_helper snd_seq_device joydev firewire_core mmc_core cfg80211 drm pcmcia yenta_socket snd thinkpad_acpi soundcore rsrc_nonstatic i2c_algo_bit i2c_i801 wmi uhci_hcd pcmcia_core ricoh_mmc crc_itu_t snd_page_alloc ehci_hcd i2c_core ata_piix ata_generic e1000e rfkill led_class nvram usbcore nls_base processor button ac battery psmouse evdev pcspkr video output serio_raw ext4 mbcache jbd2 crc
>> 16 dm_mod sd_mod crc_t10dif ahci libata scsi_mod thermal thermal_sys [last unloaded: kvm]
>> [ 75.608352] Pid: 2422, comm: init Not tainted 2.6.32-5-686-bigmem #1
>> [ 75.608357] Call Trace:
>> [ 75.608369] [<c1036819>] ? warn_slowpath_common+0x5e/0x8a
>> [ 75.608378] [<c103684f>] ? warn_slowpath_null+0xa/0xc
>> [ 75.608386] [<c11a38b9>] ? tty_ldisc_reinit+0x3e/0x6c
>> [ 75.608394] [<c11a39d6>] ? tty_ldisc_hangup+0xef/0x172
>> [ 75.608403] [<c10a5c14>] ? remove_vma+0x43/0x48
>> [ 75.608413] [<c119e136>] ? do_tty_hangup+0xd0/0x2b1
>> [ 75.608422] [<c119e60d>] ? disassociate_ctty+0x3b/0x1b3
>> [ 75.608430] [<c103961a>] ? do_exit+0x212/0x5cd
>> [ 75.608439] [<c1039a34>] ? do_group_exit+0x5f/0x82
>> [ 75.608449] [<c10449bf>] ? get_signal_to_deliver+0x30d/0x32e
>> [ 75.608459] [<c10075b4>] ? do_notify_resume+0x6f/0x713
>> [ 75.608469] [<c110a800>] ? security_task_wait+0xc/0xd
>> [ 75.608478] [<c103902e>] ? wait_consider_task+0x983/0x990
>> [ 75.608488] [<c104a804>] ? remove_wait_queue+0xb/0x2f
>> [ 75.608496] [<c10391ea>] ? do_wait+0x1af/0x1e3
>> [ 75.608504] [<c10392b6>] ? sys_wait4+0x98/0xa2
>> [ 75.608514] [<c1037c44>] ? child_wait_callback+0x0/0x5f
>> [ 75.608522] [<c10392d3>] ? sys_waitpid+0x13/0x17
>> [ 75.608530] [<c10082f4>] ? work_notifysig+0x13/0x1b
>> [ 75.608536] ---[ end trace a550edb008c670a3 ]---
> [...].
>
> This warning message was added by the bug fix "TTY: ldisc, do not close
> until there are readers". I don't believe that the warning a
> regression; it's just reporting a problem that already existed.
>
> If you would like to help us understand and fix the problem, please can
> you test the attached patch, following the instructions at
> <http://kernel-handbook.alioth.debian.org/ch-common-tasks.html#s-common-official>. It should replace the warnings with log lines of the form
> "tty_ldisc_reinit: refcount of <name> is still <number>" which you
> should send back.
>
> Ben.
>
> --
> Ben Hutchings
> Quantity is no substitute for quality, but it's the only one we've got.
>
Hi, Ben.
I am not sure, that i do all correctly, but it doesn't compile. Here
is what i get
$ apt-get source linux-2.6=2.6.32-38
$ cd linux-2.6-2.6.32/
$ bash debian/bin/test-patches ../0001-TTY-tty_ldisc_wait_idle-debug.patch
[...]
CC [M] drivers/bluetooth/btmrvl_sdio.o
LD drivers/cdrom/built-in.o
CC [M] drivers/cdrom/cdrom.o
CC drivers/char/mem.o
CC drivers/char/random.o
CC drivers/char/tty_io.o
CC drivers/char/n_tty.o
CC drivers/char/tty_ioctl.o
CC drivers/char/tty_ldisc.o
/home/sgf/Documents/kernel/src/test_patch/linux-2.6-2.6.32/debian/build/source_i386_none/drivers/char/tty_ldisc.c:
In function ‘tty_ldisc_reinit’:
/home/sgf/Documents/kernel/src/test_patch/linux-2.6-2.6.32/debian/build/source_i386_none/drivers/char/tty_ldisc.c:742:
error: implicit declaration of function ‘printk_ratelimited’
make[6]: *** [drivers/char/tty_ldisc.o] Error 1
make[5]: *** [drivers/char] Error 2
make[4]: *** [drivers] Error 2
make[3]: *** [sub-make] Error 2
make[2]: *** [all] Error 2
make[2]: Leaving directory
`/home/sgf/Documents/kernel/src/test_patch/linux-2.6-2.6.32/debian/build/build_i386_none_686-bigmem'
make[1]: *** [debian/stamps/build_i386_none_686-bigmem_plain] Error 2
make[1]: Leaving directory
`/home/sgf/Documents/kernel/src/test_patch/linux-2.6-2.6.32'
make: *** [binary-arch_i386_none_686-bigmem_real] Error 2
Dmitriy Matrosov.
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