VMALLOC_END change: commit 0536bdf33faff4d940ac094c77998cfac368cfffupstream

From: Varun Wadekar
Date: Tue May 22 2012 - 02:15:42 EST


Hi,

With commit 0536bdf33faff4d940ac094c77998cfac368cfff we now have static mappings inside the vmalloc range. I am using this change on Tegra in my downstream kernel with Android. I see that with static mappings from 0xFB000000-0xFF000000 I get the following crashes when I boot my device.

<snip>

[ 345.059841] Unable to handle kernel paging request at virtual address 90011000
[ 345.067063] pgd = ebc34000
[ 345.069793] [90011000] *pgd=00000000
[ 345.073383] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 345.078685] Modules linked in: bcmdhd cfg80211 inv_mpu_ak8975 inv_mpu_kxtf9 mpu3050
[ 345.086380] CPU: 0 Tainted: G W (3.4.0-rc1-05660-g0d4b175 #1)
[ 345.093351] PC is at vmap_page_range_noflush+0xf0/0x200
[ 345.098569] LR is at vmap_page_range+0x14/0x50
[ 345.103005] pc : [<c01091c8>] lr : [<c01092ec>] psr: 80000013
[ 345.103009] sp : ebc41e38 ip : fe000fff fp : 00002000
[ 345.114472] r10: c0a78480 r9 : 90011000 r8 : c096e2ac
[ 345.119685] r7 : 90011000 r6 : 00000000 r5 : fe000000 r4 : 00000000
[ 345.126198] r3 : 50011452 r2 : f385c400 r1 : fe000fff r0 : f385c400
[ 345.132713] Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 345.139835] Control: 10c5387d Table: abc3404a DAC: 00000015

<snip>

<snip>

[ 736.834629] Unable to handle kernel paging request at virtual address 94711780
[ 736.842284] pgd = eb938000
[ 736.845093] [94711780] *pgd=00000000
[ 736.848687] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 736.853994] Modules linked in: bcmdhd cfg80211 inv_mpu_ak8975 inv_mpu_kxtf9 mpu3050
[ 736.861691] CPU: 0 Tainted: G W (3.4.0-rc3-06429-g666edc3-dirty #1)
[ 736.869186] PC is at vmap_page_range_noflush+0xf0/0x200
[ 736.874404] LR is at pcpu_alloc+0x64c/0xa7c
[ 736.878581] pc : [<c01077c8>] lr : [<c00f84f8>] psr: 80000013
[ 736.878585] sp : f3627e58 ip : fefe0fff fp : 00000000
[ 736.890046] r10: c0a71a40 r9 : 94711780 r8 : c09682ac
[ 736.895259] r7 : 94711780 r6 : 00000000 r5 : fefe0000 r4 : 00000000
[ 736.901773] r3 : 54711452 r2 : f344e1c0 r1 : fefe0fff r0 : f344e1c0
[ 736.908289] Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 736.915409] Control: 10c5387d Table: ab93804a DAC: 00000015
[ 736.921142]
[ 736.921144] PC: 0xc0107748:
[ 736.925406] 7748 e1a03a83 e2432001 e1520001 e59d2010 31a00003 e58d0000 e3520000 0a00003e
[ 736.933629] 7768 e5923000 e3530000 0a00004a e7e82655 e3c37eff e3c7700f e24774c0 e0977102
[ 736.941856] 7788 0a000035 e59d001c e3a04000 e0800106 e58d0004 ea000007 e1a0100b e2855a01
[ 736.950081] 77a8 ebfc5df0 e59d2000 e2866001 e2844004 e1520005 0a000020 e59d2004 e0879004
[ 736.958302] 77c8 e7971004 e1a00009 e7923004 e2512000 1a00002b e3530000 0a000024 e59ab000
[ 736.966528] 77e8 e3e0c441 e5981000 e155000c e06b3003 e59dc008 e1a01621 e1a03143 e023139c
[ 736.974751] 7808 e59d100c e181b603 8affffe2 e1a0000b e2855a01 ebfc4dbd e3a02b02 e1a00009
[ 736.982977] 7828 e1a0100b ebfc5dcf e59d2000 e2866001 e2844004 e1520005 1affffde e59d3000
[ 736.991199]
[ 736.991200] LR: 0xc00f8478:
[ 736.995464] 8478 e59dc054 e58de010 e1a03603 e58d4044 e1a04003 e58dc03c e58d302c e28b2001
[ 737.003692] 8498 e3a01004 e59d000c eb05aab4 e5973000 e1a01004 e1500003 e1a0b000 2a00009e
[ 737.011916] 84b8 e5953038 e303ec10 e5952010 e34ce0a0 e595003c e793310b e596c010 e790010b
[ 737.020142] 84d8 e023a392 e59e2000 e59de010 e3822c02 e08cc00e e08c0000 e0883103 eb003e6c
[ 737.028365] 84f8 e3500000 aaffffe4 e59d8040 e1a04006 e59d9010 e3e06000 e59da00c e58d8010
[ 737.036590] 8518 e59d802c ea000007 e15b0006 0a00000e e595303c e5940010 e7933106 e0800009
[ 737.044810] 8538 e0800003 eb003c61 e2862001 e3a01004 e1a0000a eb05aa89 e5973000 e1a01008
[ 737.053035] 8558 e1500003 e1a06000 3affffee e59f3398 e59d8010 e5933000 e3130002 0a0000b5
[ 737.061263]
[ 737.061264] SP: 0xf3627dd8:
[ 737.065528] 7dd8 f655d090 00000003 00000001 ffffffff 00000000 c09eda80 f6af8200 00000002
[ 737.073754] 7df8 c09ee440 c01077c8 80000013 ffffffff f3627e44 c000ec98 f344e1c0 fefe0fff
[ 737.081975] 7e18 f344e1c0 54711452 00000000 fefe0000 00000000 94711780 c09682ac 94711780
[ 737.090197] 7e38 c0a71a40 00000000 fefe0fff f3627e58 c00f84f8 c01077c8 80000013 ffffffff
[ 737.098421] 7e58 fefe1000 f344e1c0 38e38e39 0000065f c0007fb8 fefe1000 fefe0fff f344e1c0
[ 737.106646] 7e78 c0a6d180 00001000 c096125c eb8ce500 c0960ae4 f344e1c0 c065e874 00000000
[ 737.114870] 7e98 00000000 c00f84f8 f67d3bb8 00000001 f67d3bdc c0960230 00000000 f3627ef0
[ 737.123092] 7eb8 f344e1c0 00000000 00000001 00000000 00000008 00001000 00000001 00000001
[ 737.131316]
[ 737.131318] IP: 0xfefe0f7f:
[ 737.135582] 0f7c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.143821] 0f9c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.152050] 0fbc ******** ******** ******** ******** ******** ******** ******** ********
[ 737.160278] 0fdc ******** ******** ******** ******** ******** ******** ******** ********
[ 737.168501] 0ffc ******** ******** ******** ******** ******** ******** ******** ********
[ 737.176725] 101c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.184950] 103c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.193173] 105c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.201397] 107c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.209623]
[ 737.209626] R0: 0xf344e140:
[ 737.213889] e140 00000000 00000018 0000000c 00000000 00000000 00000000 ebdc6ac0 ea984ac0
[ 737.222115] e160 ee371580 f2764ac0 e68b1040 ee2a7040 ebdc6040 eba6d040 f3c74580 f3dc4040
[ 737.230339] e180 f3561580 f686c580 f344e184 00000000 00000000 726d7410 32706c5f 656b6177
[ 737.238561] e1a0 7570635f 00000031 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.246784] e1c0 c164907c 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.255006] e1e0 c1649058 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.263229] e200 c1649034 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.271454] e220 c1649010 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.279682]
[ 737.279684] R1: 0xfefe0f7f:
[ 737.283946] 0f7c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.292173] 0f9c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.300397] 0fbc ******** ******** ******** ******** ******** ******** ******** ********
[ 737.308619] 0fdc ******** ******** ******** ******** ******** ******** ******** ********
[ 737.316844] 0ffc ******** ******** ******** ******** ******** ******** ******** ********
[ 737.325070] 101c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.333299] 103c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.341520] 105c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.349743] 107c ******** ******** ******** ******** ******** ******** ******** ********
[ 737.357969]
[ 737.357971] R2: 0xf344e140:
[ 737.362232] e140 00000000 00000018 0000000c 00000000 00000000 00000000 ebdc6ac0 ea984ac0
[ 737.370457] e160 ee371580 f2764ac0 e68b1040 ee2a7040 ebdc6040 eba6d040 f3c74580 f3dc4040
[ 737.378681] e180 f3561580 f686c580 f344e184 00000000 00000000 726d7410 32706c5f 656b6177
[ 737.386904] e1a0 7570635f 00000031 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.395126] e1c0 c164907c 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.403349] e1e0 c1649058 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.411571] e200 c1649034 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.419796] e220 c1649010 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.428023]
[ 737.428025] R5: 0xfefdff80:
[ 737.432290] ff80 ******** ******** ******** ******** ******** ******** ******** ********
[ 737.440513] ffa0 ******** ******** ******** ******** ******** ******** ******** ********
[ 737.448739] ffc0 ******** ******** ******** ******** ******** ******** ******** ********
[ 737.456960] ffe0 ******** ******** ******** ******** ******** ******** ******** ********
[ 737.465188] 0000 ******** ******** ******** ******** ******** ******** ******** ********
[ 737.473413] 0020 ******** ******** ******** ******** ******** ******** ******** ********
[ 737.481640] 0040 ******** ******** ******** ******** ******** ******** ******** ********
[ 737.489866] 0060 ******** ******** ******** ******** ******** ******** ******** ********
[ 737.498093]
[ 737.498095] R8: 0xc096822c:
[ 737.502359] 822c c064e0e4 c0336950 c064e0ec c0336e8c c064e0f4 c0336f1c c064e0fc c0337218
[ 737.510581] 824c c064e104 c0473a74 c064e110 c0473adc c064e118 c0473b9c c064e120 c0473bd4
[ 737.518806] 826c c064e128 c0473efc c064e130 c0473f64 c064e138 c0474024 c064e140 c047405c
[ 737.527032] 828c c064e148 c04ce1d4 c064e150 c04ce82c c064e158 c04ce848 c064e160 00000001
[ 737.535253] 82ac 80000000 000000c0 00000000 00000000 c0932000 00000002 00200000 00000000
[ 737.543477] 82cc 00000000 00000000 00000000 00000078 00000078 00000078 00000000 c065fa30
[ 737.551701] 82ec 00000000 00000400 00400000 00000000 00000000 00000000 c0968304 c0968304
[ 737.559925] 830c 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.568152]
[ 737.568154] R10: 0xc0a719c0:
[ 737.572504] 19c0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.580728] 19e0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.588951] 1a00 00000000 00000000 f6ffb000 000000af 00000000 00000000 00000000 00000000
[ 737.597175] 1a20 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.605397] 1a40 c1029000 00000000 00000000 00000000 0003fe00 0003eb00 f7000000 00000000
[ 737.613624] 1a60 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.621851] 1a80 00000000 00000000 00102160 00000000 c09b8eb8 c0959a90 c0933df4 00000000
[ 737.630075] 1aa0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 737.638309] Process zygote (pid: 1495, stack limit = 0xf36262f0)
[ 737.644301] Stack: (0xf3627e58 to 0xf3628000)
[ 737.648649] 7e40: fefe1000 f344e1c0
[ 737.656814] 7e60: 38e38e39 0000065f c0007fb8 fefe1000 fefe0fff f344e1c0 c0a6d180 00001000
[ 737.664976] 7e80: c096125c eb8ce500 c0960ae4 f344e1c0 c065e874 00000000 00000000 c00f84f8
[ 737.673138] 7ea0: f67d3bb8 00000001 f67d3bdc c0960230 00000000 f3627ef0 f344e1c0 00000000
[ 737.681300] 7ec0: 00000001 00000000 00000008 00001000 00000001 00000001 00000000 ec009280
[ 737.689464] 7ee0: 00000050 c0960230 00000001 00000001 00000000 ec009280 f681b150 eba047c0
[ 737.697627] 7f00: ebdde0c0 f5c87ac0 f5cb6010 f5cb6000 f3626000 00000000 f3627f2c c007995c
[ 737.705791] 7f20: c09ab648 ebdde0c0 00000000 c00a7a44 bed4986c ee769400 f67d3bb8 000001fd
[ 737.713954] 7f40: 00000000 00000000 f67d3bb8 f655fb88 00000000 c000f2c4 f3626000 00000000
[ 737.722119] 7f60: 00000000 c0120e9c 00000000 c0120f78 bed4986c 000001fd f3627f88 000001fd
[ 737.730281] 7f80: f67d3bb8 c0120f94 f681b150 f655d668 00000000 bed4986c bed498cf 00000015
[ 737.738443] 7fa0: 00000027 c000f100 bed4986c bed498cf bed4986c 000001fd bed4986c 00000000
[ 737.746607] 7fc0: bed4986c bed498cf 00000015 00000027 0000272c 0000272c 00000000 00000000
[ 737.754769] 7fe0: bed498c0 bed49860 b6f055a7 b6eebae8 60000010 bed4986c ff5b5b5b ff5b5b5b
[ 737.762966] [<c01077c8>] (vmap_page_range_noflush+0xf0/0x200) from [<c00f84f8>] (pcpu_alloc+0x64c/0xa7c)
[ 737.772450] [<c00f84f8>] (pcpu_alloc+0x64c/0xa7c) from [<c007995c>] (cpuacct_create+0x64/0x94)
[ 737.781067] [<c007995c>] (cpuacct_create+0x64/0x94) from [<c00a7a44>] (cgroup_mkdir+0xf8/0x380)
[ 737.789768] [<c00a7a44>] (cgroup_mkdir+0xf8/0x380) from [<c0120e9c>] (vfs_mkdir+0x94/0xd8)
[ 737.798024] [<c0120e9c>] (vfs_mkdir+0x94/0xd8) from [<c0120f94>] (sys_mkdirat+0xb4/0xc4)
[ 737.806115] [<c0120f94>] (sys_mkdirat+0xb4/0xc4) from [<c000f100>] (ret_fast_syscall+0x0/0x30)
[ 737.814714] Code: e1520005 0a000020 e59d2004 e0879004 (e7971004)

<snip>

Now if I change my static mappings from 0xFA000000-0xFE000000, then I never see these crashes. I thought if the virtual page mappings are getting over-written somehow or maybe vmalloc space is getting exhausted due to which we see the crashes. But I did not find any proof to support this theory.

Can some one shed some light, why this would be seen?

Thanks.

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