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OOPSes in mem_cgroup_protected




Hey Tejun,
  With the current linus/master, I'm able to fairly regularly trip
OOPSes (two examples below) in mem_cgroup_protected(), which seems to
be new.  I haven't managed to trigger this sort of thing with v4.17.

I've not had much time to dig in or bisect it - I only know that
enabling most of the memory debuging config options didn't seem to
trip anything prior to the issue. So I wanted to send you a heads up
to see if there was already known, or if there was anything you might
suggest to help chase this down.

Its fairly easy to reproduce for me, so let me know if you have
anything you'd like me to try.

thanks
-john

console:/ $ [  170.530896] Unable to handle kernel read from
unreadable memory at virtual address 0000000000000120
[  170.540158] Mem abort info:
[  170.543092]   ESR = 0x96000005
[  170.546193]   Exception class = DABT (current EL), IL = 32 bits
[  170.552251]   SET = 0, FnV = 0
[  170.555444]   EA = 0, S1PTW = 0
[  170.558698] Data abort info:
[  170.561624]   ISV = 0, ISS = 0x00000005
[  170.565572]   CM = 0, WnR = 0
[  170.568650] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000190bb04e
[  170.575374] [0000000000000120] pgd=0000000000000000, pud=0000000000000000
[  170.582297] Internal error: Oops: 96000005 [#1] PREEMPT SMP
[  170.587929] CPU: 7 PID: 663 Comm: kswapd0 Not tainted
4.17.0-11699-gb4f23f3 #411
[  170.595358] Hardware name: HiKey Development Board (DT)
[  170.600623] pstate: a0400005 (NzCv daif +PAN -UAO)
[  170.605478] pc : mem_cgroup_protected+0x34/0x120
[  170.610142] lr : shrink_node+0x120/0x478
[  170.614093] sp : ffffff8009d23c50
[  170.617438] x29: ffffff8009d23c50 x28: ffffff8009d23d48
[  170.622808] x27: ffffffc074ca1000 x26: ffffff8009d23e28
[  170.628160] x25: ffffff8009d23d88 x24: 0000000000000000
[  170.633481] x23: 0000000000000000 x22: ffffff8009071f80
[  170.638802] x21: 0000000000000012 x20: 0000000000000012
[  170.644124] x19: 0000000000000000 x18: 0000000000000400
[  170.649444] x17: 0000000000000000 x16: ffffffc074ca2000
[  170.654765] x15: 0000000000000000 x14: 0000000000000400
[  170.660087] x13: 00000000000000b1 x12: 0000000000000003
[  170.665408] x11: 0000000000000020 x10: 0000000000000000
[  170.670729] x9 : 0000000000000001 x8 : 0000000000000004
[  170.676050] x7 : ffffffc074d43c00 x6 : 0000000000000000
[  170.681370] x5 : 0000000000000000 x4 : 0000000000000000
[  170.686690] x3 : 000000000000dafa x2 : 0000000000000000
[  170.692010] x1 : ffffffc074ca1000 x0 : ffffffc0386e8000
[  170.697335] Process kswapd0 (pid: 663, stack limit = 0x00000000e0f0ae51)
[  170.704039] Call trace:
[  170.706497]  mem_cgroup_protected+0x34/0x120
[  170.710775]  balance_pgdat+0x1cc/0x418
[  170.714529]  kswapd+0x180/0x3b8
[  170.717674]  kthread+0xf8/0x128
[  170.720824]  ret_from_fork+0x10/0x18
[  170.724411] Code: b40007a2 d103e042 eb02001f 540006c0 (f9409046)
[  170.730542] ---[ end trace 7c961b6d409886f1 ]---
[  170.839299] Kernel panic - not syncing: Fatal exception
[  170.844549] SMP: stopping secondary CPUs
[  170.848488] Kernel Offset: disabled
[  170.851982] CPU features: 0x24802004
[  170.855556] Memory Limit: none
[  170.888494] Rebooting in 5 seconds..




console:/ # [  348.612152] Unable to handle kernel read from
unreadable memory at virtual address 0000000000000120
[  348.617384] Unable to handle kernel access to user memory outside
uaccess routines at virtual address 0000000000000120
[  348.621360] Mem abort info:
[  348.632086] Mem abort info:
[  348.634870]   ESR = 0x96000005
[  348.634885]   Exception class = DABT (current EL), IL = 32 bits
[  348.637686]   ESR = 0x96000005
[  348.640785]   SET = 0, FnV = 0
[  348.646740]   Exception class = DABT (current EL), IL = 32 bits
[  348.649799]   EA = 0, S1PTW = 0
[  348.652892]   SET = 0, FnV = 0
[  348.652901]   EA = 0, S1PTW = 0
[  348.652913] Data abort info:
[  348.658905] Data abort info:
[  348.662041]   ISV = 0, ISS = 0x00000005
[  348.662050]   CM = 0, WnR = 0
[  348.662071] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000697cecc4
[  348.665129]   ISV = 0, ISS = 0x00000005
[  348.668298] [0000000000000120] pgd=000000003a915003, pud=000000003a915003
[  348.671224]   CM = 0, WnR = 0
[  348.671242] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000c568bd29
[  348.674193] , pmd=0000000000000000
[  348.678021] [0000000000000120] pgd=0000000000000000, pud=0000000000000000
[  348.691540] Internal error: Oops: 96000005 [#1] PREEMPT SMP
[  348.723733] CPU: 5 PID: 3246 Comm: CrRendererMain Not tainted
4.17.0-11699-gb4f23f3 #412
[  348.731857] Hardware name: HiKey Development Board (DT)
[  348.737121] pstate: a0400005 (NzCv daif +PAN -UAO)
[  348.741975] pc : mem_cgroup_protected+0x34/0x120
[  348.746640] lr : shrink_node+0x120/0x478
[  348.750590] sp : ffffff800ac9b8a0
[  348.753934] x29: ffffff800ac9b8a0 x28: ffffff800ac9b9d8
[  348.759304] x27: ffffffc071982480 x26: ffffff800ac9bb30
[  348.764673] x25: ffffff800ac9ba18 x24: 0000000000000000
[  348.770038] x23: 0000000000000000 x22: ffffff8009113d00
[  348.775404] x21: 000000000000000f x20: 000000000000000f
[  348.780769] x19: 0000000000000000 x18: 0000000000000000
[  348.786134] x17: 0000000000000000 x16: ffffffc071985a80
[  348.791500] x15: 0000000000000000 x14: 00000000d5e75c2f
[  348.796868] x13: 00000000d7237d18 x12: 0000000000000003
[  348.802233] x11: 0000000000000020 x10: 0000000000000000
[  348.807598] x9 : 0000000000000001 x8 : 0000000000000004
[  348.812963] x7 : ffffffc072d58c80 x6 : 0000000000000000
[  348.818311] x5 : 0000000000000000 x4 : 0000000000000000
[  348.823626] x3 : 000000000000e1fc x2 : 0000000000000000
[  348.828941] x1 : ffffffc071982480 x0 : ffffffc038700080
[  348.834258] Process CrRendererMain (pid: 3246, stack limit =
0x00000000b82069c1)
[  348.841652] Call trace:
[  348.844100]  mem_cgroup_protected+0x34/0x120
[  348.848370]  do_try_to_free_pages+0xd0/0x3c0
[  348.852639]  try_to_free_pages+0xf8/0x120
[  348.856651]  __alloc_pages_nodemask+0x460/0xb68
[  348.861181]  do_huge_pmd_anonymous_page+0x328/0x7d8
[  348.866061]  __handle_mm_fault+0x57c/0xea0
[  348.870157]  handle_mm_fault+0x128/0x1f8
[  348.874082]  do_page_fault+0x1d0/0x490
[  348.877830]  do_translation_fault+0x5c/0x68
[  348.882012]  do_mem_abort+0x54/0x118
[  348.885587]  el0_da+0x20/0x24
[  348.888557] Code: b40007a2 d103e042 eb02001f 540006c0 (f9409046)
[  348.894651] ---[ end trace 58afd90183767ac2 ]---
[  348.942150] Kernel panic - not syncing: Fatal exception
[  348.947448] SMP: stopping secondary CPUs
[  349.784747] SMP: failed to stop secondary CPUs 2,5
[  349.789569] Kernel Offset: disabled
[  349.793089] CPU features: 0x24802004
[  349.796691] Memory Limit: none
[  349.909567] Rebooting in 5 seconds..