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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 26 Mar 2020 08:27:11 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 02Q8RAcW57868520 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 26 Mar 2020 08:27:11 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DA72AA405C; Thu, 26 Mar 2020 08:27:10 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 52328A405B; Thu, 26 Mar 2020 08:27:09 +0000 (GMT) Received: from [9.79.188.120] (unknown [9.79.188.120]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 26 Mar 2020 08:27:09 +0000 (GMT) From: Sachin Sant Content-Type: multipart/mixed; boundary="Apple-Mail=_D3DDA360-B6EA-4B33-85FA-E546881B060E" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Subject: [powerpc] Intermittent crashes ( link_path_walk) with linux-next Date: Thu, 26 Mar 2020 13:57:08 +0530 Cc: Linux Next Mailing List , Al Viro To: linuxppc-dev@lists.ozlabs.org, linux-fsdevel@vger.kernel.org X-Mailer: Apple Mail (2.3445.104.11) X-TM-AS-GCONF: 00 x-cbid: 20032608-0028-0000-0000-000003EC143F X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20032608-0029-0000-0000-000024B184AE Message-Id: <1CB4E533-FD97-4C39-87ED-4857F3AB9097@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.645 definitions=2020-03-25_15:2020-03-24,2020-03-25 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 suspectscore=0 adultscore=0 priorityscore=1501 spamscore=0 phishscore=0 malwarescore=0 mlxlogscore=855 clxscore=1011 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003260053 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org --Apple-Mail=_D3DDA360-B6EA-4B33-85FA-E546881B060E Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 I am running into intermittent crashes with linux-next on POWER 9 = PowerVM LPAR First it was against next-20200324 while running LTP tests. With = next-20200325 I ran into similar crash (a different stack trace but same failure point = =E2=80=94 link_path_walk) while running sosreport command. BUG: Kernel NULL pointer dereference on read at 0x00000000 Faulting instruction address: 0xc00000000043f278 Oops: Kernel access of bad area, sig: 11 [#1] LE PAGE_SIZE=3D64K MMU=3DHash SMP NR_CPUS=3D2048 NUMA pSeries Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: loop iscsi_target_mod target_core_mod macsec tcp_diag = udp_diag inet_diag unix_diag af_packet_diag netlink_diag binfmt_misc = overlay dm_mod nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c = ip6_tables nft_compat ip_set rfkill nf_tables nfnetlink sunrpc sg = pseries_rng uio_pdrv_genirq uio sch_fq_codel ip_tables ext4 mbcache jbd2 = sr_mod sd_mod cdrom t10_pi ibmvscsi scsi_transport_srp ibmveth CPU: 26 PID: 7771 Comm: avocado Not tainted = 5.6.0-rc7-next-20200324-autotest #1 NIP: c00000000043f278 LR: c00000000043f330 CTR: 00000000000001fb REGS: c00000082802f830 TRAP: 0300 Not tainted = (5.6.0-rc7-next-20200324-autotest) MSR: 8000000000009033 CR: 28248442 XER: = 20040000 CFAR: c00000000000dec4 DAR: 0000000000000000 DSISR: 40000000 IRQMASK: 0=20= GPR00: c00000000043f330 c00000082802fac0 c00000000155e900 = 0000000000000000=20 GPR04: 0000000000000002 0000000000000000 0000000000000002 = c0000008b3400000=20 GPR08: 0000000000031419 0000000000000000 0000000000000000 = ffffffffffff0000=20 GPR12: 0000000000008000 c00000001ec48600 00007fffa08a53f8 = 0000000000000001=20 GPR16: 00007fff9faf9a63 00000100073bec00 00007fff9f2493b0 = 0000000000000000=20 GPR20: 00007fffa1143bf8 00007fffa1103b18 c00000087f547cb3 = 2f2f2f2f2f2f2f2f=20 GPR24: 0000000000000003 0000000000000000 c00000082802fbc8 = fffffffffffff000=20 GPR28: 0000000000200000 ffffffffffffffff 61c8864680b583eb = 0000000000000000=20 NIP [c00000000043f278] link_path_walk.part.49+0x228/0x400 LR [c00000000043f330] link_path_walk.part.49+0x2e0/0x400 Call Trace: [c00000082802fac0] [c00000000043f330] link_path_walk.part.49+0x2e0/0x400 = (unreliable) [c00000082802fb50] [c00000000043f5a4] path_lookupat.isra.51+0x64/0x1f0 [c00000082802fba0] [c000000000441c00] filename_lookup.part.69+0xa0/0x1b0 [c00000082802fce0] [c00000000042ff38] vfs_statx+0xa8/0x190 [c00000082802fd60] [c0000000004302a0] __do_sys_newstat+0x40/0x90 [c00000082802fe20] [c00000000000b278] system_call+0x5c/0x68 Instruction dump: 3bffffff e93a0058 38800000 7f43d378 7fff07b4 1d5f0030 7d295214 eac90020=20= 4bfffb21 2fa30000 409e00c8 e93a0008 <81290000> 55290256 7f89e000 = 419efecc=20 ---[ end trace 34abf29ebd56e423 ]=E2=80=94 Relevant snippet from obj dump: 6dc4: 20 00 c9 ea ld r22,32(r9) link =3D walk_component(nd, 0); 6db4: 78 d3 43 7f mr r3,r26 name =3D nd->stack[--depth].name; 6db8: b4 07 ff 7f extsw r31,r31 6dbc: 30 00 5f 1d mulli r10,r31,48 6dc0: 14 52 29 7d add r9,r9,r10 6dc4: 20 00 c9 ea ld r22,32(r9) link =3D walk_component(nd, 0); 6dc8: 01 00 00 48 bl 6dc8 = if (unlikely(link)) { 6dcc: 00 00 a3 2f cmpdi cr7,r3,0 6dd0: c8 00 9e 40 bne cr7,6e98 = return dentry->d_flags & DCACHE_ENTRY_TYPE; 6dd4: 08 00 3a e9 ld r9,8(r26) 6dd8: 00 00 29 81 lwz r9,0(r9) <<=3D=3D=3D crashes = here ?? 6ddc: 56 02 29 55 rlwinm r9,r9,0,9,11 if (unlikely(!d_can_lookup(nd->path.dentry))) { 6de0: 00 e0 89 7f cmpw cr7,r9,r28 The code in question (link_path_walk() in fs/namei.c ) was recently = changed by following commit: commit 881386f7e46a:=20 link_path_walk(): sample parent's i_uid and i_mode for the last = component Thanks -Sachin --Apple-Mail=_D3DDA360-B6EA-4B33-85FA-E546881B060E Content-Disposition: attachment; filename=next-20200325.log Content-Type: application/octet-stream; x-unix-mode=0644; name="next-20200325.log" Content-Transfer-Encoding: 7bit Crash while running sosreport command: [ 1917.926113] BUG: Kernel NULL pointer dereference on read at 0x00000000 [ 1917.926126] Faulting instruction address: 0xc00000000043f638 [ 1917.926131] Oops: Kernel access of bad area, sig: 11 [#1] [ 1917.926136] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries [ 1917.926147] Dumping ftrace buffer: [ 1917.926157] (ftrace buffer empty) [ 1917.926161] Modules linked in: iscsi_target_mod target_core_mod macsec tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag binfmt_misc overlay dm_mod nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c ip6_tables nft_compat ip_set rfkill nf_tables nfnetlink sunrpc sg pseries_rng uio_pdrv_genirq uio sch_fq_codel ip_tables ext4 mbcache jbd2 sr_mod cdrom sd_mod t10_pi ibmvscsi scsi_transport_srp ibmveth [ 1917.926198] CPU: 12 PID: 20734 Comm: busctl Not tainted 5.6.0-rc7-next-20200325-autotest #1 [ 1917.926203] NIP: c00000000043f638 LR: c00000000043f6f0 CTR: 0000000000000000 [ 1917.926209] REGS: c00000082bc1f720 TRAP: 0300 Not tainted (5.6.0-rc7-next-20200325-autotest) [ 1917.926215] MSR: 8000000000009033 CR: 28022422 XER: 20040000 [ 1917.926222] CFAR: c00000000000dec4 DAR: 0000000000000000 DSISR: 40000000 IRQMASK: 0 [ 1917.926222] GPR00: c00000000043f6f0 c00000082bc1f9b0 c00000000155e800 0000000000000000 [ 1917.926222] GPR04: 0000000000000002 0000000000000000 0000000000000002 c0000008b3400000 [ 1917.926222] GPR08: 000000000000febb 0000000000000000 0000000000000000 ffffffffffff0000 [ 1917.926222] GPR12: 0000000000002000 c00000001ec5d600 0000000135ed11e0 c0000008879046d0 [ 1917.926222] GPR16: 7fffffffffffffff fffffffffffffe00 fffffffffffffffc fffffffffffffff5 [ 1917.926222] GPR20: c00000089fa27200 0000000000000000 c00000008609bf33 2f2f2f2f2f2f2f2f [ 1917.926222] GPR24: 0000000000000003 0000000000000000 c00000082bc1fab8 fffffffffffff000 [ 1917.926222] GPR28: 0000000000200000 ffffffffffffffff 61c8864680b583eb 0000000000000001 [ 1917.926270] NIP [c00000000043f638] link_path_walk.part.49+0x228/0x400 [ 1917.926275] LR [c00000000043f6f0] link_path_walk.part.49+0x2e0/0x400 [ 1917.926280] Call Trace: [ 1917.926284] [c00000082bc1f9b0] [c00000000043f6f0] link_path_walk.part.49+0x2e0/0x400 (unreliable) [ 1917.926291] [c00000082bc1fa40] [c00000000043f964] path_lookupat.isra.51+0x64/0x1f0 [ 1917.926296] [c00000082bc1fa90] [c000000000441fc0] filename_lookup.part.69+0xa0/0x1b0 [ 1917.926303] [c00000082bc1fbd0] [c000000000ae0784] unix_find_other+0x64/0x3f0 [ 1917.926309] [c00000082bc1fc60] [c000000000ae1b78] unix_stream_connect+0x148/0x930 [ 1917.926316] [c00000082bc1fd30] [c000000000933010] __sys_connect+0x140/0x170 [ 1917.926322] [c00000082bc1fe00] [c000000000933068] sys_connect+0x28/0x40 [ 1917.926328] [c00000082bc1fe20] [c00000000000b278] system_call+0x5c/0x68 [ 1917.926332] Instruction dump: [ 1917.926336] 3bffffff e93a0058 38800000 7f43d378 7fff07b4 1d5f0030 7d295214 eac90020 [ 1917.926343] 4bfffb21 2fa30000 409e00c8 e93a0008 <81290000> 55290256 7f89e000 419efecc [ 1917.926351] ---[ end trace 1b673f0e7295c08b ]--- Objdump o/p =========== fs/namei.o: file format elf64-powerpcle Disassembly of section .text: 0000000000000000 : * In particular, we must end by hashing a final word containing 0..7 * payload bytes, to match the way that hash_name() iterates until it * finds the delimiter after the name. */ unsigned int full_name_hash(const void *salt, const char *name, unsigned int len) { 0: a6 02 08 7c mflr r0 4: 01 00 00 48 bl 4 unsigned long a, x = 0, y = (unsigned long)salt; for (;;) { if (!len) ......... ......... 0000000000006bb0 : static int link_path_walk(const char *name, struct nameidata *nd) 6bb0: 00 00 4c 3c addis r2,r12,0 6bb4: 00 00 42 38 addi r2,r2,0 6bb8: a6 02 08 7c mflr r0 6bbc: 01 00 00 48 bl 6bbc 6bc0: b0 ff c1 fa std r22,-80(r1) 6bc4: d0 ff 41 fb std r26,-48(r1) 6bc8: c0 ff 01 fb std r24,-64(r1) 6bcc: 78 1b 76 7c mr r22,r3 6bd0: 71 ff 21 f8 stdu r1,-144(r1) 6bd4: 78 23 9a 7c mr r26,r4 6bd8: 18 00 41 f8 std r2,24(r1) 6bdc: 78 11 2d e9 ld r9,4472(r13) 6be0: 38 00 21 f9 std r9,56(r1) 6be4: 00 00 20 39 li r9,0 while (*name=='/') 6be8: 00 00 23 89 lbz r9,0(r3) 6bec: 2f 00 89 2b cmplwi cr7,r9,47 6bf0: 1c 00 9e 40 bne cr7,6c0c 6bf4: 00 00 00 60 nop 6bf8: 00 00 00 60 nop 6bfc: 00 00 00 60 nop 6c00: 01 00 36 8d lbzu r9,1(r22) 6c04: 2f 00 89 2b cmplwi cr7,r9,47 6c08: f8 ff 9e 41 beq cr7,6c00 if (!*name) 6c0c: 00 00 a9 2f cmpdi cr7,r9,0 return 0; 6c10: 00 00 00 3b li r24,0 if (!*name) 6c14: 3c 00 9e 40 bne cr7,6c50 } 6c18: 38 00 21 e9 ld r9,56(r1) 6c1c: 78 11 4d e9 ld r10,4472(r13) 6c20: 79 52 29 7d xor. r9,r9,r10 6c24: 00 00 40 39 li r10,0 6c28: 78 c3 03 7f mr r3,r24 6c2c: 54 03 82 40 bne 6f80 6c30: 90 00 21 38 addi r1,r1,144 6c34: b0 ff c1 ea ld r22,-80(r1) 6c38: c0 ff 01 eb ld r24,-64(r1) 6c3c: d0 ff 41 eb ld r26,-48(r1) 6c40: 20 00 80 4e blr 6c44: 00 00 00 60 nop 6c48: 00 00 00 60 nop 6c4c: 00 00 00 60 nop 6c50: 48 00 e1 fa std r23,72(r1) 6c54: 80 00 c1 fb std r30,128(r1) b = a ^ REPEAT_BYTE('/'); 6c58: 2f 2f e0 3e lis r23,12079 6c5c: 2f 2f f7 62 ori r23,r23,12079 6c60: a6 02 08 7c mflr r0 y ^= x * GOLDEN_RATIO_64; 6c64: c8 61 c0 3f lis r30,25032 6c68: 46 86 de 63 ori r30,r30,34374 6c6c: 58 00 21 fb std r25,88(r1) 6c70: 68 00 61 fb std r27,104(r1) unsigned long a = 0, b, x = 0, y = (unsigned long)salt; 6c74: 00 00 20 3b li r25,0 6c78: 70 00 81 fb std r28,112(r1) 6c7c: 78 00 a1 fb std r29,120(r1) 6c80: 88 00 e1 fb std r31,136(r1) x ^= a & zero_bytemask(mask); 6c84: ff ff a0 3b li r29,-1 int depth = 0; // depth <= nd->depth 6c88: 00 00 e0 3b li r31,0 if (unlikely(!d_can_lookup(nd->path.dentry))) { 6c8c: 20 00 80 3f lis r28,32 if (IS_ERR(link)) 6c90: 00 f0 60 3b li r27,-4096 b = a ^ REPEAT_BYTE('/'); 6c94: c6 07 f7 7a rldicr r23,r23,32,31 y ^= x * GOLDEN_RATIO_64; 6c98: c6 07 de 7b rldicr r30,r30,32,31 b = a ^ REPEAT_BYTE('/'); 6c9c: 2f 2f f7 66 oris r23,r23,12079 6ca0: a0 00 01 f8 std r0,160(r1) y ^= x * GOLDEN_RATIO_64; 6ca4: b5 80 de 67 oris r30,r30,32949 b = a ^ REPEAT_BYTE('/'); 6ca8: 2f 2f f7 62 ori r23,r23,12079 y ^= x * GOLDEN_RATIO_64; 6cac: eb 83 de 63 ori r30,r30,33771 if (nd->flags & LOOKUP_RCU) { 6cb0: 38 00 3a 81 lwz r9,56(r26) 6cb4: 30 00 7a e8 ld r3,48(r26) 6cb8: 40 00 29 71 andi. r9,r9,64 6cbc: 08 02 82 41 beq 6ec4 int err = inode_permission(nd->inode, MAY_EXEC|MAY_NOT_BLOCK); 6cc0: 81 00 80 38 li r4,129 6cc4: 01 00 00 48 bl 6cc4 if (err != -ECHILD) 6cc8: f6 ff 83 2f cmpwi cr7,r3,-10 int err = inode_permission(nd->inode, MAY_EXEC|MAY_NOT_BLOCK); 6ccc: 78 1b 78 7c mr r24,r3 if (err != -ECHILD) 6cd0: e0 01 9e 41 beq cr7,6eb0 if (err) 6cd4: 00 00 b8 2f cmpdi cr7,r24,0 6cd8: 30 01 9e 40 bne cr7,6e08 hash_len = hash_name(nd->path.dentry, name); 6cdc: 08 00 7a e8 ld r3,8(r26) len = 0; 6ce0: 00 00 a0 38 li r5,0 unsigned long a = 0, b, x = 0, y = (unsigned long)salt; 6ce4: 00 00 c0 38 li r6,0 6ce8: 78 1b 67 7c mr r7,r3 goto inside; 6cec: 24 00 00 48 b 6d10 HASH_MIX(x, y, a); 6cf0: 78 4a c9 7c xor r9,r6,r9 len += sizeof(unsigned long); 6cf4: 08 00 a5 38 addi r5,r5,8 HASH_MIX(x, y, a); 6cf8: 78 3a 26 7d xor r6,r9,r7 6cfc: 00 60 29 79 rotldi r9,r9,12 6d00: 02 68 c7 78 rotldi r7,r6,45 6d04: 14 4a c6 7c add r6,r6,r9 6d08: 24 1f e9 78 rldicr r9,r7,3,60 6d0c: 14 3a e9 7c add r7,r9,r7 a = load_unaligned_zeropad(name+len); 6d10: 14 2a 56 7d add r10,r22,r5 asm( 6d14: 00 00 2a e9 ld r9,0(r10) b = a ^ REPEAT_BYTE('/'); 6d18: 78 ba 2a 7d xor r10,r9,r23 asm("cmpb %0,%1,%2" : "=r" (ret) : "r" (a), "r" (zero)); 6d1c: f8 cb 28 7d cmpb r8,r9,r25 6d20: f8 cb 4a 7d cmpb r10,r10,r25 } while (!(has_zero(a, &adata, &constants) | has_zero(b, &bdata, &constants))); 6d24: 79 53 0a 7d or. r10,r8,r10 6d28: c8 ff 82 41 beq 6cf0 asm("addi %1,%2,-1\n\t" 6d2c: ff ff 0a 39 addi r8,r10,-1 6d30: 78 50 08 7d andc r8,r8,r10 6d34: f4 03 0a 7d popcntd r10,r8 x ^= a & zero_bytemask(mask); 6d38: 36 50 ab 7f sld r11,r29,r10 return mask >> 3; 6d3c: c2 e8 48 79 rldicl r8,r10,61,3 if (name[0] == '.') switch (hashlen_len(hash_len)) { 6d40: 00 00 96 88 lbz r4,0(r22) x ^= a & zero_bytemask(mask); 6d44: 78 58 2a 7d andc r10,r9,r11 return hashlen_create(fold_hash(x, y), len + find_zero(mask)); 6d48: 14 2a 08 7d add r8,r8,r5 x ^= a & zero_bytemask(mask); 6d4c: 78 32 49 7d xor r9,r10,r6 if (name[0] == '.') switch (hashlen_len(hash_len)) { 6d50: 2e 00 84 2f cmpwi cr7,r4,46 y ^= x * GOLDEN_RATIO_64; 6d54: d2 f1 29 7d mulld r9,r9,r30 6d58: 78 3a 29 7d xor r9,r9,r7 y *= GOLDEN_RATIO_64; 6d5c: d2 f1 29 7d mulld r9,r9,r30 return y >> 32; 6d60: 22 00 29 79 rldicl r9,r9,32,32 return hashlen_create(fold_hash(x, y), len + find_zero(mask)); 6d64: 0e 00 09 79 rldimi r9,r8,32,0 if (name[0] == '.') switch (hashlen_len(hash_len)) { 6d68: c8 00 9e 41 beq cr7,6e30 6d6c: 38 00 5a 81 lwz r10,56(r26) nd->flags &= ~LOOKUP_JUMPED; 6d70: 24 05 4a 55 rlwinm r10,r10,0,20,18 6d74: 38 00 5a 91 stw r10,56(r26) if (unlikely(parent->d_flags & DCACHE_OP_HASH)) { 6d78: 00 00 43 81 lwz r10,0(r3) 6d7c: 01 00 4a 71 andi. r10,r10,1 6d80: 70 01 82 40 bne 6ef0 6d84: 22 00 28 79 rldicl r8,r9,32,32 nd->last.hash_len = hash_len; 6d88: 10 00 3a f9 std r9,16(r26) nd->last.name = name; 6d8c: 18 00 da fa std r22,24(r26) nd->last_type = type; 6d90: 48 00 1a 93 stw r24,72(r26) if (!*name) 6d94: ee 40 36 7d lbzux r9,r22,r8 6d98: 00 00 89 2f cmpwi cr7,r9,0 6d9c: d4 00 9e 40 bne cr7,6e70 if (!depth) { 6da0: 00 00 bf 2f cmpdi cr7,r31,0 6da4: ac 01 9e 41 beq cr7,6f50 name = nd->stack[--depth].name; 6da8: ff ff ff 3b addi r31,r31,-1 6dac: 58 00 3a e9 ld r9,88(r26) link = walk_component(nd, 0); 6db0: 00 00 80 38 li r4,0 6db4: 78 d3 43 7f mr r3,r26 name = nd->stack[--depth].name; 6db8: b4 07 ff 7f extsw r31,r31 6dbc: 30 00 5f 1d mulli r10,r31,48 6dc0: 14 52 29 7d add r9,r9,r10 6dc4: 20 00 c9 ea ld r22,32(r9) link = walk_component(nd, 0); 6dc8: 01 00 00 48 bl 6dc8 if (unlikely(link)) { 6dcc: 00 00 a3 2f cmpdi cr7,r3,0 6dd0: c8 00 9e 40 bne cr7,6e98 return dentry->d_flags & DCACHE_ENTRY_TYPE; 6dd4: 08 00 3a e9 ld r9,8(r26) 6dd8: 00 00 29 81 lwz r9,0(r9) 6ddc: 56 02 29 55 rlwinm r9,r9,0,9,11 if (unlikely(!d_can_lookup(nd->path.dentry))) { 6de0: 00 e0 89 7f cmpw cr7,r9,r28 6de4: cc fe 9e 41 beq cr7,6cb0 if (nd->flags & LOOKUP_RCU) { 6de8: 38 00 3a 81 lwz r9,56(r26) 6dec: 40 00 29 71 andi. r9,r9,64 6df0: 38 01 82 41 beq 6f28 if (unlazy_walk(nd)) 6df4: 78 d3 43 7f mr r3,r26 6df8: 01 00 00 48 bl 6df8 6dfc: 00 00 a3 2f cmpdi cr7,r3,0 6e00: 28 01 9e 41 beq cr7,6f28 return -ECHILD; 6e04: f6 ff 00 3b li r24,-10 6e08: a0 00 01 e8 ld r0,160(r1) 6e0c: 48 00 e1 ea ld r23,72(r1) 6e10: 58 00 21 eb ld r25,88(r1) 6e14: 68 00 61 eb ld r27,104(r1) 6e18: 70 00 81 eb ld r28,112(r1) 6e1c: 78 00 a1 eb ld r29,120(r1) 6e20: 80 00 c1 eb ld r30,128(r1) 6e24: 88 00 e1 eb ld r31,136(r1) 6e28: a6 03 08 7c mtlr r0 6e2c: ec fd ff 4b b 6c18 if (name[0] == '.') switch (hashlen_len(hash_len)) { 6e30: 22 00 28 79 rldicl r8,r9,32,32 6e34: 20 00 0a 79 clrldi r10,r8,32 6e38: 01 00 8a 2b cmplwi cr7,r10,1 6e3c: a4 00 9e 41 beq cr7,6ee0 6e40: 02 00 8a 2b cmplwi cr7,r10,2 6e44: 28 ff 9e 40 bne cr7,6d6c if (name[1] == '.') { 6e48: 01 00 f6 88 lbz r7,1(r22) 6e4c: 38 00 5a 81 lwz r10,56(r26) 6e50: 2e 00 87 2f cmpwi cr7,r7,46 6e54: 1c ff 9e 40 bne cr7,6d70 nd->flags |= LOOKUP_JUMPED; 6e58: 00 10 4a 61 ori r10,r10,4096 type = LAST_DOTDOT; 6e5c: 03 00 00 3b li r24,3 nd->flags |= LOOKUP_JUMPED; 6e60: 38 00 5a 91 stw r10,56(r26) if (likely(type == LAST_NORM)) { 6e64: 24 ff ff 4b b 6d88 6e68: 00 00 00 60 nop 6e6c: 00 00 00 60 nop } while (unlikely(*name == '/')); 6e70: 01 00 36 8d lbzu r9,1(r22) 6e74: 2f 00 89 2b cmplwi cr7,r9,47 6e78: f8 ff 9e 41 beq cr7,6e70 if (unlikely(!*name)) { 6e7c: 00 00 a9 2f cmpdi cr7,r9,0 6e80: 20 ff 9e 41 beq cr7,6da0 link = walk_component(nd, WALK_MORE); 6e84: 02 00 80 38 li r4,2 6e88: 78 d3 43 7f mr r3,r26 6e8c: 01 00 00 48 bl 6e8c if (unlikely(link)) { 6e90: 00 00 a3 2f cmpdi cr7,r3,0 6e94: 40 ff 9e 41 beq cr7,6dd4 if (IS_ERR(link)) 6e98: 40 d8 a3 7f cmpld cr7,r3,r27 6e9c: 94 00 9d 40 ble cr7,6f30 return PTR_ERR(link); 6ea0: b4 07 78 7c extsw r24,r3 6ea4: 64 ff ff 4b b 6e08 6ea8: 00 00 00 60 nop 6eac: 00 00 00 60 nop if (unlazy_walk(nd)) 6eb0: 78 d3 43 7f mr r3,r26 6eb4: 01 00 00 48 bl 6eb4 6eb8: 00 00 a3 2f cmpdi cr7,r3,0 6ebc: 48 ff 9e 40 bne cr7,6e04 6ec0: 30 00 7a e8 ld r3,48(r26) return inode_permission(nd->inode, MAY_EXEC); 6ec4: 01 00 80 38 li r4,1 6ec8: 01 00 00 48 bl 6ec8 6ecc: 78 1b 78 7c mr r24,r3 6ed0: 04 fe ff 4b b 6cd4 6ed4: 00 00 00 60 nop 6ed8: 00 00 00 60 nop 6edc: 00 00 00 60 nop type = LAST_DOT; 6ee0: 02 00 00 3b li r24,2 6ee4: a4 fe ff 4b b 6d88 6ee8: 00 00 00 60 nop 6eec: 00 00 00 60 nop err = parent->d_op->d_hash(parent, &this); 6ef0: 60 00 43 e9 ld r10,96(r3) struct qstr this = { { .hash_len = hash_len }, .name = name }; 6ef4: 28 00 21 f9 std r9,40(r1) 6ef8: 30 00 c1 fa std r22,48(r1) err = parent->d_op->d_hash(parent, &this); 6efc: 28 00 81 38 addi r4,r1,40 6f00: 10 00 2a e9 ld r9,16(r10) 6f04: 78 4b 2c 7d mr r12,r9 6f08: a6 03 29 7d mtctr r9 6f0c: 21 04 80 4e bctrl 6f10: 18 00 41 e8 ld r2,24(r1) if (err < 0) 6f14: 00 00 83 2f cmpwi cr7,r3,0 6f18: 60 00 9c 41 blt cr7,6f78 hash_len = this.hash_len; 6f1c: 28 00 21 e9 ld r9,40(r1) name = this.name; 6f20: 30 00 c1 ea ld r22,48(r1) 6f24: 60 fe ff 4b b 6d84 return -ENOTDIR; 6f28: ec ff 00 3b li r24,-20 6f2c: dc fe ff 4b b 6e08 nd->stack[depth++].name = name; 6f30: 30 00 5f 1d mulli r10,r31,48 6f34: 58 00 3a e9 ld r9,88(r26) 6f38: 01 00 ff 3b addi r31,r31,1 6f3c: b4 07 ff 7f extsw r31,r31 6f40: 14 52 29 7d add r9,r9,r10 6f44: 20 00 c9 fa std r22,32(r9) 6f48: 78 1b 76 7c mr r22,r3 6f4c: 64 fd ff 4b b 6cb0 nd->dir_uid = nd->inode->i_uid; 6f50: 30 00 5a e9 ld r10,48(r26) nd->flags &= ~LOOKUP_PARENT; 6f54: 38 00 3a 81 lwz r9,56(r26) return 0; 6f58: 00 00 00 3b li r24,0 nd->dir_uid = nd->inode->i_uid; 6f5c: 04 00 0a 81 lwz r8,4(r10) nd->flags &= ~LOOKUP_PARENT; 6f60: 34 07 29 55 rlwinm r9,r9,0,28,26 nd->dir_uid = nd->inode->i_uid; 6f64: d8 00 1a 91 stw r8,216(r26) nd->dir_mode = nd->inode->i_mode; 6f68: 00 00 4a a1 lhz r10,0(r10) nd->flags &= ~LOOKUP_PARENT; 6f6c: 38 00 3a 91 stw r9,56(r26) nd->dir_mode = nd->inode->i_mode; 6f70: dc 00 5a b1 sth r10,220(r26) return 0; 6f74: 94 fe ff 4b b 6e08 err = parent->d_op->d_hash(parent, &this); 6f78: 78 1b 78 7c mr r24,r3 6f7c: 8c fe ff 4b b 6e08 6f80: a6 02 08 7c mflr r0 6f84: 48 00 e1 fa std r23,72(r1) 6f88: 58 00 21 fb std r25,88(r1) 6f8c: 68 00 61 fb std r27,104(r1) 6f90: 70 00 81 fb std r28,112(r1) 6f94: 78 00 a1 fb std r29,120(r1) 6f98: 80 00 c1 fb std r30,128(r1) 6f9c: 88 00 e1 fb std r31,136(r1) 6fa0: a0 00 01 f8 std r0,160(r1) } 6fa4: 01 00 00 48 bl 6fa4 6fa8: 00 00 00 60 nop 6fac: 00 00 00 60 nop --Apple-Mail=_D3DDA360-B6EA-4B33-85FA-E546881B060E--