Messages in this thread | | | Subject | AW: [SYSFS] Kernel Null pointer dereference in sysfs_readdir() | Date | Wed, 12 Jul 2006 14:39:45 +0200 | From | "Duetsch, Thomas LDE1" <> |
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Steven Rostedt wrote: > On Wed, 2006-07-12 at 13:35 +0200, Duetsch, Thomas LDE1 wrote: >> Hi, >> >> I'm currently working on a custom kernel based on Ingo's -rt patch >> (2.6.16-rt29). >> >> While rebooting my machine, I came across a kernel null pointer >> dereference in this code segment in fs/sysfs/dir.c, function >> sysfs_readdir(): >> >> for (p=q->next; p!= &parent_sd->s_children; p=p->next) { struct >> sysfs_dirent *next; const char * name; >> int len; >> >> next = list_entry(p, struct sysfs_dirent, >> s_sibling); >> if (!next->s_element) >> continue; >> >> name = sysfs_get_name(next); >> len = strlen(name); >> if (next->s_dentry) >> PROBLEM -> ino = next->s_dentry->d_inode->i_ino; >> else >> ino = iunique(sysfs_sb, 2); >> > > Hi Thomas, > > Do you have a backtrace to look at? It might be helpful to see what > functions brought us to this point. Also it might help to determine if > the problem is vanilla, -rt, or the custom kernel. > > Thanks, > > -- Steve
Of course, here you go:
<1>BUG: Unable to handle kernel NULL pointer dereference at virtual address 00000020 <1> printing eip: <4>c01af187 <1>*pde = 00000000 <0>Oops: 0000 [#1] <0>PREEMPT <4>cpu=0 current find:2667 <4>current resource_set: 0 <4> [<c0103fb1>] show_trace+0x21/0x30 (20) <4> [<c01040ee>] dump_stack+0x1e/0x30 (20) <4> [<c01044ca>] die+0xba/0x1b0 (68) <4> [<c01146ed>] do_page_fault+0x37d/0x6d0 (96) <4> [<c0103b0b>] error_code+0x4f/0x54 (120) <4> [<c0182a60>] vfs_readdir+0xa0/0xc0 (36) <4> [<c0182e85>] sys_getdents64+0x75/0xd0 (64) <4> [<c0102fd9>] syscall_call+0x7/0xb (-8116) <4>Modules linked in: ide_dump diskdump ipv6 eeprom adm1021 hwmon i2c_piix4 i2c_core NPCI pcnet32 e100 unix <0>CPU: 0 <4>EIP: 0060:[<c01af187>] Tainted: P VLI <4>EFLAGS: 00010286 (2.6.16-rt29-rs_1.0 #1) <0>EIP is at sysfs_readdir+0xd7/0x240 <0>eax: 00000000 ebx: cfd095a0 ecx: 00000005 edx: cf02be88 <0>esi: cfd0959c edi: ce150c16 ebp: c35b5f50 esp: c35b5f14 <0>ds: 007b es: 007b ss: 0068 preempt: 00000001 <0>Process find (pid: 2667, threadinfo=c35b4000 task=c3686730 wchan=00000000) stack_left=7900 worst_left=-1) <0>Stack: <0>cfd0959c c3618e60 00000004 00000003 00000000 00000d74 00000004 cfe46a58 <0> 00000005 ce150c10 cf02bb68 cfe46a4c ca844f20 fffffffe cfe47e40 c35b5f74 <0> c0182a60 ca844f20 c35b5f98 c0182d20 cfe47ec8 00001000 ca844f20 c0182d20 <0>Call Trace: <4>cpu=0 current find:2667 <4>current resource_set: 0 <0> [<c010406a>] show_stack_log_lvl+0xaa/0xe0 (32) <0> [<c01042ca>] show_registers+0x1ca/0x250 (64) <0> [<c0104508>] die+0xf8/0x1b0 (68) <0> [<c01146ed>] do_page_fault+0x37d/0x6d0 (96) <0> [<c0103b0b>] error_code+0x4f/0x54 (120) <0> [<c0182a60>] vfs_readdir+0xa0/0xc0 (36) <0> [<c0182e85>] sys_getdents64+0x75/0xd0 (64) <0> [<c0102fd9>] syscall_call+0x7/0xb (-8116) <0>Code: 8d 74 26 00 89 34 24 e8 68 e4 ff ff 89 45 e8 b9 ff ff ff ff 31 c0 8b 7d e8 f2 ae f7 d1 49 89 4d e4 8b 46 20 85 c0 74 74 8b 40 20 <8b> 50 20 0f b7 46 1c 89 54 24 14 8b 4d 08 c1 e8 0c 89 44 24 18
I hope that helps,
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