diff for duplicates of <1512576648.26816.3.camel@primarydata.com> diff --git a/a/1.txt b/N1/1.txt index bc3c0dd..099caba 100644 --- a/a/1.txt +++ b/N1/1.txt @@ -1,111 +1,156 @@ -SGkgR2VlcnQsDQoNCk9uIFdlZCwgMjAxNy0xMi0wNiBhdCAxNTozMSArMDEwMCwgR2VlcnQgVXl0 -dGVyaG9ldmVuIHdyb3RlOg0KPiBIaSBUcm9uZC4gQW5uYSwNCj4gDQo+IE9uIFR1ZSwgRGVjIDUs -IDIwMTcgYXQgNTowMiBQTSwgR2VlcnQgVXl0dGVyaG9ldmVuIDxnZWVydEBsaW51eC1tNjhrLg0K -PiBvcmc+IHdyb3RlOg0KPiA+IER1cmluZyBhIGZhaWxlZCB3cml0ZSB0byBhIHZpcnR1YWwgc3lz -ZnMgZmlsZSAocm9vdCBmcyBpcyBORlMpLCBJDQo+ID4gZ290Og0KPiA+IA0KPiA+IFVuYWJsZSB0 -byBoYW5kbGUga2VybmVsIE5VTEwgcG9pbnRlciBkZXJlZmVyZW5jZSBhdCB2aXJ0dWFsIGFkZHJl -c3MNCj4gPiAwMDAwMDAyMA0KPiA+IHBnZCA9IGM0NDhiYjE1DQo+ID4gWzAwMDAwMDIwXSAqcGdk -PTY5YzljMDAzLCAqcG1kPTY5ZDU1MDAzLCAqcHRlPTAwMDAwMDAwDQo+ID4gSW50ZXJuYWwgZXJy -b3I6IE9vcHM6IDIwNyBbIzFdIFNNUCBBUk0NCj4gPiBNb2R1bGVzIGxpbmtlZCBpbjoNCj4gPiBD -UFU6IDAgUElEOiAxMjMwIENvbW06IHJzOm1haW4gUTpSZWcgTm90IHRhaW50ZWQNCj4gPiA0LjE1 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-IA0KDQpJJ20gY29uZnVzZWQuIElmIHlvdXIgdGVzdCBpbnZvbHZlcyBvbmx5IHdyaXRpbmcgdG8g -YSBzeXNmcyBmaWxlLCB0aGVuDQp3aHkgaXMgdGhlIE5GUyBjb2RlIGludm9sdmVkIGF0IGFsbD8g -Q291bGQgdGhpcyBiZSBhIHVzZS1hZnRlci1mcmVlPw0KDQotLSANClRyb25kIE15a2xlYnVzdA0K -TGludXggTkZTIGNsaWVudCBtYWludGFpbmVyLCBQcmltYXJ5RGF0YQ0KdHJvbmQubXlrbGVidXN0 -QHByaW1hcnlkYXRhLmNvbQ0K +Hi Geert, + +On Wed, 2017-12-06 at 15:31 +0100, Geert Uytterhoeven wrote: +> Hi Trond. Anna, +> +> On Tue, Dec 5, 2017 at 5:02 PM, Geert Uytterhoeven <geert@linux-m68k. +> org> wrote: +> > During a failed write to a virtual sysfs file (root fs is NFS), I +> > got: +> > +> > Unable to handle kernel NULL pointer dereference at virtual address +> > 00000020 +> > pgd = c448bb15 +> > [00000020] *pgd=69c9c003, *pmd=69d55003, *pte=00000000 +> > Internal error: Oops: 207 [#1] SMP ARM +> > Modules linked in: +> > CPU: 0 PID: 1230 Comm: rs:main Q:Reg Not tainted +> > 4.15.0-rc2-koelsch-01160-gd389a154c640caab-dirty #3752 +> > Hardware name: Generic R-Car Gen2 (Flattened Device Tree) +> > task: 4a3bb6d2 task.stack: fd0c00bd +> > PC is at nfs_flush_incompatible+0x54/0xf8 +> +> Got another nfsroot crash: +> +> Unable to handle kernel NULL pointer dereference at virtual address +> 00000030 +> pgd = 329e8f6e +> [00000030] *pgd=80000040004003, *pmd=00000000 +> Internal error: Oops: 206 [#1] SMP ARM +> Modules linked in: +> CPU: 0 PID: 101 Comm: kworker/u4:1 Not tainted +> 4.15.0-rc2-koelsch-01166-g047d7d3248e08fc7-dirty #3762 +> Hardware name: Generic R-Car Gen2 (Flattened Device Tree) +> Workqueue: writeback wb_workfn (flush-0:15) +> task: 8a5bf858 task.stack: e93c92bc +> PC is at nfs_page_async_flush+0x110/0x244 +> LR is at 0x10 +> pc : [<c03bc648>] lr : [<00000010>] psr: 400f0013 +> sp : eaff9c98 ip : c0c5092b fp : 00000005 +> r10: 00018e84 r9 : ebef92c0 r8 : eaff9d64 +> r7 : ea421a00 r6 : ebef92c0 r5 : ea999040 r4 : ea9b1a00 +> r3 : 00000000 r2 : 00000006 r1 : 00000000 r0 : 00000000 +> Flags: nZcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user +> Control: 30c5387d Table: 69d65680 DAC: fffffffd +> Process kworker/u4:1 (pid: 101, stack limit = 0xeaff8210) +> Stack: (0xeaff9c98 to 0xeaffa000) +> 9c80: ebef92c0 +> eaff9d64 +> 9ca0: eaff9e20 ea421afc 00000000 c03bc858 eaff9e20 00000000 ffffffff +> c02b11e8 +> 9cc0: 00000000 ea8f4500 eb427328 00018e89 00000000 00000009 eaff9d0c +> 00000000 +> 9ce0: c03bc830 eaff9d64 00000000 ffffffff 00000009 00000000 ebef8440 +> ebef45c0 +> 9d00: ebf1abc0 ebef8860 ebef8420 ebef92c0 ebef5ce0 ebef7e80 ebef3cc0 +> eaff9d1c +> 9d20: eaff9d1c eb1d2d98 eb1d2d28 ea421a00 eb400700 ea421a00 eab89bc0 +> ea421afc +> 9d40: eaff9e20 ea421afc 00000002 ea421a50 eaff8000 c03bc94c c081590c +> c02483d8 +> 9d60: eaa62140 00000001 ea421a00 c08157cc c08158e0 00000000 00000000 +> c08157bc +> 9d80: c081590c 00000000 eab89bc0 00000000 00001000 00000001 eaff9d9c +> ea999fc0 +> 9da0: ea999fc0 00004000 00001000 00001000 00000000 c0745704 00000000 +> 00000000 +> 9dc0: ec09e250 eaff9e20 ea421afc eaff9e20 ea9c4c38 c02b2d48 00000086 +> ea421a00 +> 9de0: ea421a00 c0310434 ea421a00 eaff9e20 00000000 ea421ab4 ea421a00 +> 00001400 +> 9e00: ea9c4c38 eaff9efc 00000002 c03109b8 ea9c4c64 00003fd0 ea98b800 +> 00000000 +> 9e20: 000013fb 00000000 00000000 00000000 ffffffff 7fffffff 00000000 +> 00000011 +> 9e40: 00000000 ea9c4c38 00000000 c0e04900 00003fda eaff9efc ea9c4c4c +> ea98b800 +> 9e60: eb1f7584 c0310be0 ea9c4c4c ea9c4c38 eaff9efc c0e04900 ea9c4c64 +> 0000175c +> 9e80: ea9c4d90 c0e13020 0000000a c0310d2c 00003fd0 00003fd0 eb465198 +> 00003418 +> 9ea0: eaff9ea0 eaff9ea0 eaff9ea8 eaff9ea8 eaff9eb0 eaff9eb0 0000001a +> ea9c4d98 +> 9ec0: ea9c4c38 0000175c ea9c4d90 ea9c4c3c ea9c4d80 00000000 00000088 +> c03110a0 +> 9ee0: 00000000 c023b924 eb9a0d80 eafd7100 eb465100 eabe8000 00000000 +> 0000175c +> 9f00: 00000000 eaff9e9c 00000000 00000006 00000003 00000000 00000000 +> 00000000 +> 9f20: eb7f6200 ea9c4d98 eb406600 00000000 eb407f00 00000000 ea9c4d9c +> c0235bdc +> 9f40: eb7f6200 ea9c4d98 eb7f6200 eb406600 eb406600 eaff8000 eb406624 +> c0e04900 +> 9f60: eb7f6218 c023634c eafd7100 eb7f6380 eb7a7fc0 00000000 eb443ee4 +> eb7f63a8 +> 9f80: eb7f6200 c0236080 00000000 c023a528 eb7a7fc0 c023a40c 00000000 +> 00000000 +> 9fa0: 00000000 00000000 00000000 c0206f38 00000000 00000000 00000000 +> 00000000 +> 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 +> 00000000 +> 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 +> 00000000 +> [<c03bc648>] (nfs_page_async_flush) from [<c03bc858>] +> (nfs_writepages_callback+0x28/0x54) +> [<c03bc858>] (nfs_writepages_callback) from [<c02b11e8>] +> (write_cache_pages+0x278/0x364) +> [<c02b11e8>] (write_cache_pages) from [<c03bc94c>] +> (nfs_writepages+0xa8/0xe8) +> [<c03bc94c>] (nfs_writepages) from [<c02b2d48>] +> (do_writepages+0x34/0x80) +> [<c02b2d48>] (do_writepages) from [<c0310434>] +> (__writeback_single_inode+0x34/0x194) +> [<c0310434>] (__writeback_single_inode) from [<c03109b8>] +> (writeback_sb_inodes+0x1cc/0x390) +> [<c03109b8>] (writeback_sb_inodes) from [<c0310be0>] +> (__writeback_inodes_wb+0x64/0xa0) +> [<c0310be0>] (__writeback_inodes_wb) from [<c0310d2c>] +> (wb_writeback+0x110/0x18c) +> [<c0310d2c>] (wb_writeback) from [<c03110a0>] (wb_workfn+0x1b8/0x304) +> [<c03110a0>] (wb_workfn) from [<c0235bdc>] +> (process_one_work+0x1cc/0x31c) +> [<c0235bdc>] (process_one_work) from [<c023634c>] +> (worker_thread+0x2cc/0x408) +> [<c023634c>] (worker_thread) from [<c023a528>] (kthread+0x11c/0x13c) +> [<c023a528>] (kthread) from [<c0206f38>] (ret_from_fork+0x14/0x3c) +> Code: e3a02001 e5c32004 ebf98e95 e595300c (e5930030) +> ---[ end trace 2771b70506a823a3 ]--- +> +> static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, +> struct page *page) +> { +> struct nfs_page *req; +> int ret = 0; +> +> ... +> +> /* If there is a fatal error that covers this write, just +> exit */ +> if (nfs_error_is_fatal_on_server(req->wb_context->error)) +> goto out_launder; +> +> c03bc644: e595300c ldr r3, [r5, #12] +> c03bc648: e5930030 ldr r0, [r3, #48] ; 0x30 +> c03bc64c: ebfffd1b bl c03bbac0 +> <nfs_error_is_fatal_on_server> +> +> req->wb_context must be NULL. +> + +I'm confused. If your test involves only writing to a sysfs file, then +why is the NFS code involved at all? Could this be a use-after-free? + +-- +Trond Myklebust +Linux NFS client maintainer, PrimaryData +trond.myklebust@primarydata.com diff --git a/a/content_digest b/N1/content_digest index da2e85d..1f88fb2 100644 --- a/a/content_digest +++ b/N1/content_digest @@ -11,116 +11,161 @@ " me@tobin.cc <me@tobin.cc>\0" "\00:1\0" "b\0" - "SGkgR2VlcnQsDQoNCk9uIFdlZCwgMjAxNy0xMi0wNiBhdCAxNTozMSArMDEwMCwgR2VlcnQgVXl0\n" - "dGVyaG9ldmVuIHdyb3RlOg0KPiBIaSBUcm9uZC4gQW5uYSwNCj4gDQo+IE9uIFR1ZSwgRGVjIDUs\n" - "IDIwMTcgYXQgNTowMiBQTSwgR2VlcnQgVXl0dGVyaG9ldmVuIDxnZWVydEBsaW51eC1tNjhrLg0K\n" - "PiBvcmc+IHdyb3RlOg0KPiA+IER1cmluZyBhIGZhaWxlZCB3cml0ZSB0byBhIHZpcnR1YWwgc3lz\n" - "ZnMgZmlsZSAocm9vdCBmcyBpcyBORlMpLCBJDQo+ID4gZ290Og0KPiA+IA0KPiA+IFVuYWJsZSB0\n" - "byBoYW5kbGUga2VybmVsIE5VTEwgcG9pbnRlciBkZXJlZmVyZW5jZSBhdCB2aXJ0dWFsIGFkZHJl\n" - "c3MNCj4gPiAwMDAwMDAyMA0KPiA+IHBnZCA9IGM0NDhiYjE1DQo+ID4gWzAwMDAwMDIwXSAqcGdk\n" - "PTY5YzljMDAzLCAqcG1kPTY5ZDU1MDAzLCAqcHRlPTAwMDAwMDAwDQo+ID4gSW50ZXJuYWwgZXJy\n" - "b3I6IE9vcHM6IDIwNyBbIzFdIFNNUCBBUk0NCj4gPiBNb2R1bGVzIGxpbmtlZCBpbjoNCj4gPiBD\n" - 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Anna,\n" + "> \n" + "> On Tue, Dec 5, 2017 at 5:02 PM, Geert Uytterhoeven <geert@linux-m68k.\n" + "> org> wrote:\n" + "> > During a failed write to a virtual sysfs file (root fs is NFS), I\n" + "> > got:\n" + "> > \n" + "> > Unable to handle kernel NULL pointer dereference at virtual address\n" + "> > 00000020\n" + "> > pgd = c448bb15\n" + "> > [00000020] *pgd=69c9c003, *pmd=69d55003, *pte=00000000\n" + "> > Internal error: Oops: 207 [#1] SMP ARM\n" + "> > Modules linked in:\n" + "> > CPU: 0 PID: 1230 Comm: rs:main Q:Reg Not tainted\n" + "> > 4.15.0-rc2-koelsch-01160-gd389a154c640caab-dirty #3752\n" + "> > Hardware name: Generic R-Car Gen2 (Flattened Device Tree)\n" + "> > task: 4a3bb6d2 task.stack: fd0c00bd\n" + "> > PC is at nfs_flush_incompatible+0x54/0xf8\n" + "> \n" + "> Got another nfsroot crash:\n" + "> \n" + "> Unable to handle kernel NULL pointer dereference at virtual address\n" + "> 00000030\n" + "> pgd = 329e8f6e\n" + "> [00000030] *pgd=80000040004003, *pmd=00000000\n" + "> Internal error: Oops: 206 [#1] SMP ARM\n" + "> Modules linked in:\n" + "> CPU: 0 PID: 101 Comm: kworker/u4:1 Not tainted\n" + "> 4.15.0-rc2-koelsch-01166-g047d7d3248e08fc7-dirty #3762\n" + "> Hardware name: Generic R-Car Gen2 (Flattened Device Tree)\n" + "> Workqueue: writeback wb_workfn (flush-0:15)\n" + "> task: 8a5bf858 task.stack: e93c92bc\n" + "> PC is at nfs_page_async_flush+0x110/0x244\n" + "> LR is at 0x10\n" + "> pc : [<c03bc648>] lr : [<00000010>] psr: 400f0013\n" + "> sp : eaff9c98 ip : c0c5092b fp : 00000005\n" + "> r10: 00018e84 r9 : ebef92c0 r8 : eaff9d64\n" + "> r7 : ea421a00 r6 : ebef92c0 r5 : ea999040 r4 : ea9b1a00\n" + "> r3 : 00000000 r2 : 00000006 r1 : 00000000 r0 : 00000000\n" + "> Flags: nZcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user\n" + "> Control: 30c5387d Table: 69d65680 DAC: fffffffd\n" + "> Process kworker/u4:1 (pid: 101, stack limit = 0xeaff8210)\n" + "> Stack: (0xeaff9c98 to 0xeaffa000)\n" + "> 9c80: ebef92c0\n" + "> eaff9d64\n" + "> 9ca0: eaff9e20 ea421afc 00000000 c03bc858 eaff9e20 00000000 ffffffff\n" + "> c02b11e8\n" + "> 9cc0: 00000000 ea8f4500 eb427328 00018e89 00000000 00000009 eaff9d0c\n" + "> 00000000\n" + "> 9ce0: c03bc830 eaff9d64 00000000 ffffffff 00000009 00000000 ebef8440\n" + "> ebef45c0\n" + "> 9d00: ebf1abc0 ebef8860 ebef8420 ebef92c0 ebef5ce0 ebef7e80 ebef3cc0\n" + "> eaff9d1c\n" + "> 9d20: eaff9d1c eb1d2d98 eb1d2d28 ea421a00 eb400700 ea421a00 eab89bc0\n" + "> ea421afc\n" + "> 9d40: eaff9e20 ea421afc 00000002 ea421a50 eaff8000 c03bc94c c081590c\n" + "> c02483d8\n" + "> 9d60: eaa62140 00000001 ea421a00 c08157cc c08158e0 00000000 00000000\n" + "> c08157bc\n" + "> 9d80: c081590c 00000000 eab89bc0 00000000 00001000 00000001 eaff9d9c\n" + "> ea999fc0\n" + "> 9da0: ea999fc0 00004000 00001000 00001000 00000000 c0745704 00000000\n" + "> 00000000\n" + "> 9dc0: ec09e250 eaff9e20 ea421afc eaff9e20 ea9c4c38 c02b2d48 00000086\n" + "> ea421a00\n" + "> 9de0: ea421a00 c0310434 ea421a00 eaff9e20 00000000 ea421ab4 ea421a00\n" + "> 00001400\n" + "> 9e00: ea9c4c38 eaff9efc 00000002 c03109b8 ea9c4c64 00003fd0 ea98b800\n" + "> 00000000\n" + "> 9e20: 000013fb 00000000 00000000 00000000 ffffffff 7fffffff 00000000\n" + "> 00000011\n" + "> 9e40: 00000000 ea9c4c38 00000000 c0e04900 00003fda eaff9efc ea9c4c4c\n" + "> ea98b800\n" + "> 9e60: eb1f7584 c0310be0 ea9c4c4c ea9c4c38 eaff9efc c0e04900 ea9c4c64\n" + "> 0000175c\n" + "> 9e80: ea9c4d90 c0e13020 0000000a c0310d2c 00003fd0 00003fd0 eb465198\n" + "> 00003418\n" + "> 9ea0: eaff9ea0 eaff9ea0 eaff9ea8 eaff9ea8 eaff9eb0 eaff9eb0 0000001a\n" + "> ea9c4d98\n" + "> 9ec0: ea9c4c38 0000175c ea9c4d90 ea9c4c3c ea9c4d80 00000000 00000088\n" + "> c03110a0\n" + "> 9ee0: 00000000 c023b924 eb9a0d80 eafd7100 eb465100 eabe8000 00000000\n" + "> 0000175c\n" + "> 9f00: 00000000 eaff9e9c 00000000 00000006 00000003 00000000 00000000\n" + "> 00000000\n" + "> 9f20: eb7f6200 ea9c4d98 eb406600 00000000 eb407f00 00000000 ea9c4d9c\n" + "> c0235bdc\n" + "> 9f40: eb7f6200 ea9c4d98 eb7f6200 eb406600 eb406600 eaff8000 eb406624\n" + "> c0e04900\n" + "> 9f60: eb7f6218 c023634c eafd7100 eb7f6380 eb7a7fc0 00000000 eb443ee4\n" + "> eb7f63a8\n" + "> 9f80: eb7f6200 c0236080 00000000 c023a528 eb7a7fc0 c023a40c 00000000\n" + "> 00000000\n" + "> 9fa0: 00000000 00000000 00000000 c0206f38 00000000 00000000 00000000\n" + "> 00000000\n" + "> 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000\n" + "> 00000000\n" + "> 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000\n" + "> 00000000\n" + "> [<c03bc648>] (nfs_page_async_flush) from [<c03bc858>]\n" + "> (nfs_writepages_callback+0x28/0x54)\n" + "> [<c03bc858>] (nfs_writepages_callback) from [<c02b11e8>]\n" + "> (write_cache_pages+0x278/0x364)\n" + "> [<c02b11e8>] (write_cache_pages) from [<c03bc94c>]\n" + "> (nfs_writepages+0xa8/0xe8)\n" + "> [<c03bc94c>] (nfs_writepages) from [<c02b2d48>]\n" + "> (do_writepages+0x34/0x80)\n" + "> [<c02b2d48>] (do_writepages) from [<c0310434>]\n" + "> (__writeback_single_inode+0x34/0x194)\n" + "> [<c0310434>] (__writeback_single_inode) from [<c03109b8>]\n" + "> (writeback_sb_inodes+0x1cc/0x390)\n" + "> [<c03109b8>] (writeback_sb_inodes) from [<c0310be0>]\n" + "> (__writeback_inodes_wb+0x64/0xa0)\n" + "> [<c0310be0>] (__writeback_inodes_wb) from [<c0310d2c>]\n" + "> (wb_writeback+0x110/0x18c)\n" + "> [<c0310d2c>] (wb_writeback) from [<c03110a0>] (wb_workfn+0x1b8/0x304)\n" + "> [<c03110a0>] (wb_workfn) from [<c0235bdc>]\n" + "> (process_one_work+0x1cc/0x31c)\n" + "> [<c0235bdc>] (process_one_work) from [<c023634c>]\n" + "> (worker_thread+0x2cc/0x408)\n" + "> [<c023634c>] (worker_thread) from [<c023a528>] (kthread+0x11c/0x13c)\n" + "> [<c023a528>] (kthread) from [<c0206f38>] (ret_from_fork+0x14/0x3c)\n" + "> Code: e3a02001 e5c32004 ebf98e95 e595300c (e5930030)\n" + "> ---[ end trace 2771b70506a823a3 ]---\n" + "> \n" + "> static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,\n" + "> struct page *page)\n" + "> {\n" + "> struct nfs_page *req;\n" + "> int ret = 0;\n" + "> \n" + "> ...\n" + "> \n" + "> /* If there is a fatal error that covers this write, just\n" + "> exit */\n" + "> if (nfs_error_is_fatal_on_server(req->wb_context->error))\n" + "> goto out_launder;\n" + "> \n" + "> c03bc644: e595300c ldr r3, [r5, #12]\n" + "> c03bc648: e5930030 ldr r0, [r3, #48] ; 0x30\n" + "> c03bc64c: ebfffd1b bl c03bbac0\n" + "> <nfs_error_is_fatal_on_server>\n" + "> \n" + "> req->wb_context must be NULL.\n" + "> \n" + "\n" + "I'm confused. If your test involves only writing to a sysfs file, then\n" + "why is the NFS code involved at all? Could this be a use-after-free?\n" + "\n" + "-- \n" + "Trond Myklebust\n" + "Linux NFS client maintainer, PrimaryData\n" + trond.myklebust@primarydata.com -89f962a371f3c860a480b716fffcfa82ff7a760627db45decfe8c1050e5b6cae +366690fbe0a9194f2462498777ce390b2591cffde88e2ba49e564db3046a948c
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