On Monday 01 March 2010, Michal Hocko wrote: > [Let's CC mm guys] I guess it's rather architecture-related than a genering mm issue. > On Mon, Mar 01, 2010 at 10:07:37PM +0100, Rafael J. Wysocki wrote: > > On Monday 01 March 2010, Michal Hocko wrote: > > > Hi, > > > > > > I have experienced the following kernel BUG on resume from suspend from > > > disk (the whole log from hibarnation to suspend along with kernel > > > config are attached): > > > > > > BUG: unable to handle kernel paging request at 00aaaaaa > > > IP: [<c019e28c>] anon_vma_link+0x2c/0x39 > > > *pde = 00000000 > > > Oops: 0002 [#1] PREEMPT SMP > > > last sysfs file: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0003:00/power_supply/AC/type > > > Modules linked in: aes_i586 aes_generic iwl3945 iwlcore mac80211 cfg80211 fbcon font bitblit softcursor i915 drm_kms_helper drm fb i2c_algo_bit cfbcopyarea i2c_core cfbimgblt cfbfillrect fuse tun coretemp hwmon snd_hda_codec_realtek snd_hda_intel snd_hda_codec arc4 ecb snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_oss snd_seq_midi_event snd_seq snd_timer fujitsu_laptop snd_seq_device rtc_cmos rtc_core led_class rtc_lib snd snd_page_alloc video backlight output [last unloaded: cfg80211] > > > > > > Pid: 3942, comm: kxkb Not tainted 2.6.33-00001-gbaac35c #11 FJNB1B5/LIFEBOOK S7110 > > > EIP: 0060:[<c019e28c>] EFLAGS: 00010246 CPU: 1 > > > EIP is at anon_vma_link+0x2c/0x39 > > > EAX: 00aaaaaa EBX: f69c6410 ECX: f69c6414 EDX: f63e4df4 > > > ESI: f63e4dc0 EDI: f63e4e14 EBP: f6901ec0 ESP: f6901eb8 > > > DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 > > > Process kxkb (pid: 3942, ti=f6901000 task=f6aa6ff0 task.ti=f6901000) > > > Stack: > > > f63e4dc0 f23fc7e4 f6901efc c012fc28 f6aa6ff0 f63e4e30 f63e4e34 f63e4e24 > > > <0> ca4656f4 f6ace734 f6aa6ff0 f6ace700 ca4656c0 f23fc790 ca560000 fffffff4 > > > <0> f659ef94 f6901f38 c0130821 f6aa6ff0 f6901fb4 bff441f0 ca560208 00000000 > > > Call Trace: > > > [<c012fc28>] ? dup_mm+0x1c7/0x3d3 > > > [<c0130821>] ? copy_process+0x98e/0xf26 > > > [<c0130ed6>] ? do_fork+0x11d/0x2a1 > > > [<c0434547>] ? _raw_spin_unlock+0x14/0x28 > > > [<c01b6795>] ? set_close_on_exec+0x45/0x4b > > > [<c01b6e98>] ? do_fcntl+0x15f/0x3f1 > > > [<c0108678>] ? sys_clone+0x20/0x25 > > > [<c010291d>] ? ptregs_clone+0x15/0x38 > > > [<c0102850>] ? sysenter_do_call+0x12/0x26 > > > Code: 89 e5 56 53 0f 1f 44 00 00 8b 58 3c 89 c6 85 db 74 22 89 d8 e8 54 65 29 00 8b 43 08 8d 56 34 8d 4b 04 89 53 08 89 4e 34 89 46 38 <89> 10 89 d8 e8 9e 62 29 00 5b 5e 5d c3 55 89 e5 0f 1f 44 00 00 > > > EIP: [<c019e28c>] anon_vma_link+0x2c/0x39 SS:ESP 0068:f6901eb8 > > > CR2: 0000000000aaaaaa > > > ---[ end trace b7f008b0e5aa7c65 ]--- > > > > This looks like a low-level memory management issue of some sort. > > Yes, it really looks strange. dup_mm+0x1c7 matches to: > c102fc0e: 81 60 14 ff df ff ff andl $0xffffdfff,0x14(%eax) > c102fc15: 8b 45 ec mov -0x14(%ebp),%eax > c102fc18: c7 43 0c 00 00 00 00 movl $0x0,0xc(%ebx) > c102fc1f: 89 03 mov %eax,(%ebx) > c102fc21: 89 d8 mov %ebx,%eax > c102fc23: e8 38 e6 06 00 call c109e260 <anon_vma_link> > c102fc28: 8b 43 48 mov 0x48(%ebx),%eax <<< BANG > > which corresponds to: > kernel/fork.c:336 > tmp->vm_flags &= ~VM_LOCKED; > tmp->vm_mm = mm; > tmp->vm_next = NULL; > anon_vma_link(tmp); > file = tmp->vm_file; <<< BANG > > ebx is tmp which somehow got deallocated. I cannot see how this could happened. Through a page tables corruption or a TLB issue, for example. > > What's the HEAD commit in this kernel tree? > > $ git describe > v2.6.33-1-gbaac35c I can't find gbaac35c anywhere post 2.6.33. Can you just send the output of "git show | head -1", please? > > Also, is the problem reproducible? > > As I've already mentioned. This is the first time I have seen this problem. > I am using suspend to disk and wake up quite often (several times a day). I > haven't tried suspend/resume loop test yet. OK Given the apparent nature of the problem it will be extremely difficult to track down without a reliable way to reproduce it. Rafael -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>