#2369: cat s3c2440-uart.1/clock_source causes oops in s3c24xx_serial_show_clksrc
--------------------+-------------------------------------------------------
Reporter: lindi | Owner: openmoko-kernel
Type: defect | Status: new
Priority: normal | Milestone:
Component: kernel | Version: unspecified
Severity: normal | Keywords:
Haspatch: 0 | Blockedby:
Estimated: | Patchreview:
Blocking: | Reproducible: always
--------------------+-------------------------------------------------------
Steps to reproduce:
1) cat /sys/devices/platform/s3c2440-uart.1/clock_source as normal user
Expected results:
1) the system does not oops
Actual results:
1)
{{{
[ 5130.450000] Unable to handle kernel NULL pointer dereference at virtual
address 00000000
[ 5130.450000] pgd = c7b7c000
[ 5130.450000] [00000000] *pgd=36da9031, *pte=00000000, *ppte=00000000
[ 5130.450000] Internal error: Oops: 17 [#1]
[ 5130.450000] Modules linked in: ipv6 fuse btusb bluetooth ohci_hcd tun
snd_soc_neo1973_gta02_wm8753 snd_soc_s3c24xx_i2s snd_soc_s3c24xx g_ether
snd_soc_wm8753 snd_soc_core snd_pcm_oss snd_mixer_oss ar6000 snd_pcm
snd_timer snd_page_alloc s3cmci snd s3c2410_wdt
[ 5130.450000] CPU: 0 Tainted: G W (2.6.29-GTA02_lindi2-andy-
tracking-mokodev #4)
[ 5130.450000] PC is at s3c24xx_serial_show_clksrc+0x1c/0x30
[ 5130.450000] LR is at dev_attr_show+0x2c/0x4c
[ 5130.450000] pc : [<c0189098>] lr : [<c0189f14>] psr: a0000013
[ 5130.450000] sp : c6c8bec8 ip : c6c8bed8 fp : c6c8bed4
[ 5130.450000] r10: 0001b000 r9 : c6c8a000 r8 : c7b6ac38
[ 5130.450000] r7 : c037f320 r6 : c78bb5e4 r5 : c7b6ac20 r4 : c037f174
[ 5130.450000] r3 : 00000000 r2 : c7988000 r1 : 00001000 r0 : c7988000
[ 5130.450000] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM
Segment user
[ 5130.450000] Control: c000717f Table: 37b7c000 DAC: 00000015
[ 5130.450000] Process cat (pid: 8356, stack limit = 0xc6c8a268)
[ 5130.450000] Stack: (0xc6c8bec8 to 0xc6c8c000)
[ 5130.450000] bec0: c6c8beec c6c8bed8 c0189f14 c018908c
c036c0f4 c7b6ac20
[ 5130.450000] bee0: c6c8bf14 c6c8bef0 c00e1a28 c0189ef8 00000000 c6c1e640
c7b6ac20 c6c8bf78
[ 5130.450000] bf00: 00008000 c7b6ac38 c6c8bf4c c6c8bf18 c00e1ad4 c00e19b8
c6c8bf4c c6c8bf28
[ 5130.450000] bf20: c0034b40 c008d4e0 c6c1e640 0001b000 c6c8bf78 00008000
c002df48 00000000
[ 5130.450000] bf40: c6c8bf74 c6c8bf50 c00a10b4 c00e1a8c 00000001 00000000
00000000 00000000
[ 5130.450000] bf60: c6c1e640 00000003 c6c8bfa4 c6c8bf78 c00a13d0 c00a100c
00000000 00000000
[ 5130.450000] bf80: c0034ee8 00000000 00000000 00008000 0001b000 00000003
00000000 c6c8bfa8
[ 5130.450000] bfa0: c002dda0 c00a1394 00008000 0001b000 00000003 0001b000
00008000 0001b000
[ 5130.450000] bfc0: 00008000 0001b000 00000003 00000003 0001b000 00000000
40025000 00000000
[ 5130.450000] bfe0: 7fffe000 beaef1c0 0000dea0 400eea7c 60000010 00000003
00000000 00000000
[ 5130.450000] Backtrace:
[ 5130.450000] [<c018907c>] (s3c24xx_serial_show_clksrc+0x0/0x30) from
[<c0189f14>] (dev_attr_show+0x2c/0x4c)
[ 5130.450000] [<c0189ee8>] (dev_attr_show+0x0/0x4c) from [<c00e1a28>]
(fill_read_buffer+0x80/0xd4)
[ 5130.450000] r5:c7b6ac20 r4:c036c0f4
[ 5130.450000] [<c00e19a8>] (fill_read_buffer+0x0/0xd4) from [<c00e1ad4>]
(sysfs_read_file+0x58/0x114)
[ 5130.450000] r8:c7b6ac38 r7:00008000 r6:c6c8bf78 r5:c7b6ac20
r4:c6c1e640
[ 5130.450000] [<c00e1a7c>] (sysfs_read_file+0x0/0x114) from [<c00a10b4>]
(vfs_read+0xb8/0x148)
[ 5130.450000] [<c00a0ffc>] (vfs_read+0x0/0x148) from [<c00a13d0>]
(sys_read+0x4c/0x7c)
[ 5130.450000] r7:00000003 r6:c6c1e640 r5:00000000 r4:00000000
[ 5130.450000] [<c00a1384>] (sys_read+0x0/0x7c) from [<c002dda0>]
(ret_fast_syscall+0x0/0x2c)
[ 5130.450000] r6:00000003 r5:0001b000 r4:00008000
[ 5130.450000] Code: e590309c e3a01a01 e513300c e1a00002 (e5933000)
[ 5130.450000] ---[ end trace ef85096ca71097fb ]---
}}}
More info:
1) this is with andy-tracking 2.6.29 a3587e4ed77974ad
--
Ticket URL: <https://docs.openmoko.org/trac/ticket/2369>
docs.openmoko.org <http://docs.openmoko.org/trac/>
openmoko trac
