On Thu, Nov 12, 2020 at 10:28 AM Chuck Lever <chuck.lever@xxxxxxxxxx> wrote: > > > > > On Nov 11, 2020, at 4:42 PM, Olga Kornievskaia <aglo@xxxxxxxxx> wrote: > > > > On Tue, Nov 10, 2020 at 1:25 PM Chuck Lever <chuck.lever@xxxxxxxxxx> wrote: > > > >> Start by identifying what NFS operation is failing, and what configuration > >> of chunks it is using. > > > > This happens after decoding LIST_XATTRS reply. It's a send only reply. > > I can't tell if the real problem is in the nfs4_xdr_dec_listxattrs() > > and it's overwritting memory that messes with rpcrdma_complete_rqst() > > or it's the rdma problem. > > > > Running it with Kasan shows the following: > > > > [ 538.505743] BUG: KASAN: wild-memory-access in > > rpcrdma_complete_rqst+0x41b/0x680 [rpcrdma] > > [ 538.512019] Write of size 8 at addr 0005088000000000 by task kworker/1:1H/493 > > [ 538.517285] > > [ 538.518219] CPU: 1 PID: 493 Comm: kworker/1:1H Not tainted 5.10.0-rc3+ #33 > > [ 538.521811] Hardware name: VMware, Inc. VMware Virtual > > Platform/440BX Desktop Reference Platform, BIOS 6.00 02/27/2020 > > [ 538.529220] Workqueue: ib-comp-wq ib_cq_poll_work [ib_core] > > [ 538.532722] Call Trace: > > [ 538.534366] dump_stack+0x7c/0xa2 > > [ 538.536473] ? rpcrdma_complete_rqst+0x41b/0x680 [rpcrdma] > > [ 538.539514] ? rpcrdma_complete_rqst+0x41b/0x680 [rpcrdma] > > [ 538.542817] kasan_report.cold.9+0x6a/0x7c > > [ 538.545952] ? rpcrdma_complete_rqst+0x41b/0x680 [rpcrdma] > > [ 538.551001] check_memory_region+0x198/0x200 > > [ 538.553763] memcpy+0x38/0x60 > > [ 538.555612] rpcrdma_complete_rqst+0x41b/0x680 [rpcrdma] > > [ 538.558974] ? rpcrdma_reset_cwnd+0x70/0x70 [rpcrdma] > > [ 538.562162] ? ktime_get+0x4f/0xb0 > > [ 538.564072] ? rpcrdma_reply_handler+0x4ca/0x640 [rpcrdma] > > [ 538.567066] __ib_process_cq+0xa7/0x1f0 [ib_core] > > [ 538.569905] ib_cq_poll_work+0x31/0xb0 [ib_core] > > [ 538.573151] process_one_work+0x387/0x680 > > [ 538.575798] worker_thread+0x57/0x5a0 > > [ 538.577917] ? process_one_work+0x680/0x680 > > [ 538.581095] kthread+0x1c8/0x1f0 > > [ 538.583271] ? kthread_parkme+0x40/0x40 > > [ 538.585637] ret_from_fork+0x22/0x30 > > [ 538.587688] ================================================================== > > [ 538.591920] Disabling lock debugging due to kernel taint > > [ 538.595267] general protection fault, probably for non-canonical > > address 0x5088000000000: 0000 [#1] SMP KASAN PTI > > [ 538.601982] CPU: 1 PID: 3623 Comm: fsstress Tainted: G B > > 5.10.0-rc3+ #33 > > [ 538.609032] Hardware name: VMware, Inc. VMware Virtual > > Platform/440BX Desktop Reference Platform, BIOS 6.00 02/27/2020 > > [ 538.619678] RIP: 0010:memcpy_orig+0xf5/0x10f > > [ 538.623892] Code: 00 00 00 00 00 83 fa 04 72 1b 8b 0e 44 8b 44 16 > > fc 89 0f 44 89 44 17 fc c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 83 ea > > 01 72 19 <0f> b6 0e 74 12 4c 0f b6 46 01 4c 0f b6 0c 16 44 88 47 01 44 > > 88 0c > > [ 538.636726] RSP: 0018:ffff888018707628 EFLAGS: 00010202 > > [ 538.641125] RAX: ffff888009098855 RBX: 0000000000000008 RCX: ffffffffc19eca2d > > [ 538.645793] RDX: 0000000000000001 RSI: 0005088000000000 RDI: ffff888009098855 > > [ 538.650290] RBP: 0000000000000000 R08: ffffed100121310b R09: ffffed100121310b > > [ 538.654879] R10: ffff888009098856 R11: ffffed100121310a R12: ffff888018707788 > > [ 538.658700] R13: ffff888009098858 R14: ffff888009098857 R15: 0000000000000002 > > [ 538.662871] FS: 00007f12be1c8740(0000) GS:ffff88805ca40000(0000) > > knlGS:0000000000000000 > > [ 538.667424] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [ 538.670768] CR2: 00007f12be1c7000 CR3: 000000005c37a004 CR4: 00000000001706e0 > > [ 538.675865] Call Trace: > > [ 538.677376] nfs4_xdr_dec_listxattrs+0x31d/0x3c0 [nfsv4] > > [ 538.681151] ? nfs4_xdr_dec_read_plus+0x360/0x360 [nfsv4] > > [ 538.684232] ? xdr_inline_decode+0x1e/0x260 [sunrpc] > > [ 538.687114] call_decode+0x365/0x390 [sunrpc] > > [ 538.689626] ? rpc_decode_header+0x770/0x770 [sunrpc] > > [ 538.692410] ? var_wake_function+0x80/0x80 > > [ 538.694634] ? > > xprt_request_retransmit_after_disconnect.isra.15+0x5e/0x80 [sunrpc] > > [ 538.698920] ? rpc_decode_header+0x770/0x770 [sunrpc] > > [ 538.701578] ? rpc_decode_header+0x770/0x770 [sunrpc] > > [ 538.704252] __rpc_execute+0x11c/0x6e0 [sunrpc] > > [ 538.706829] ? trace_event_raw_event_xprt_cong_event+0x270/0x270 [sunrpc] > > [ 538.710654] ? rpc_make_runnable+0x54/0xe0 [sunrpc] > > [ 538.713416] rpc_run_task+0x29c/0x2c0 [sunrpc] > > [ 538.715806] nfs4_call_sync_custom+0xc/0x40 [nfsv4] > > [ 538.718551] nfs4_do_call_sync+0x114/0x160 [nfsv4] > > [ 538.721571] ? nfs4_call_sync_custom+0x40/0x40 [nfsv4] > > [ 538.724333] ? __alloc_pages_nodemask+0x200/0x410 > > [ 538.726794] ? kasan_unpoison_shadow+0x30/0x40 > > [ 538.729147] ? __kasan_kmalloc.constprop.8+0xc1/0xd0 > > [ 538.731733] _nfs42_proc_listxattrs+0x1f6/0x2f0 [nfsv4] > > [ 538.734504] ? nfs42_offload_cancel_done+0x50/0x50 [nfsv4] > > [ 538.737173] ? __kernel_text_address+0xe/0x30 > > [ 538.739400] ? unwind_get_return_address+0x2f/0x50 > > [ 538.741727] ? create_prof_cpu_mask+0x20/0x20 > > [ 538.744141] ? stack_trace_consume_entry+0x80/0x80 > > [ 538.746585] ? _raw_spin_lock+0x7a/0xd0 > > [ 538.748477] nfs42_proc_listxattrs+0xf4/0x150 [nfsv4] > > [ 538.750920] ? nfs42_proc_setxattr+0x150/0x150 [nfsv4] > > [ 538.753557] ? nfs4_xattr_cache_list+0x91/0x120 [nfsv4] > > [ 538.756313] nfs4_listxattr+0x34d/0x3d0 [nfsv4] > > [ 538.758506] ? _nfs4_proc_access+0x260/0x260 [nfsv4] > > [ 538.760859] ? __ia32_sys_rename+0x40/0x40 > > [ 538.762897] ? selinux_quota_on+0xf0/0xf0 > > [ 538.764827] ? __check_object_size+0x178/0x220 > > [ 538.767063] ? kasan_unpoison_shadow+0x30/0x40 > > [ 538.769233] ? security_inode_listxattr+0x53/0x60 > > [ 538.771962] listxattr+0x5b/0xf0 > > [ 538.773980] path_listxattr+0xa1/0x100 > > [ 538.776147] ? listxattr+0xf0/0xf0 > > [ 538.778064] do_syscall_64+0x33/0x40 > > [ 538.780714] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > [ 538.783440] RIP: 0033:0x7f12bdaebc8b > > [ 538.785341] Code: f0 ff ff 73 01 c3 48 8b 0d fa 21 2c 00 f7 d8 64 > > 89 01 48 83 c8 ff c3 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 c2 00 00 > > 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d cd 21 2c 00 f7 d8 64 89 > > 01 48 > > [ 538.794845] RSP: 002b:00007ffc7947cff8 EFLAGS: 00000206 ORIG_RAX: > > 00000000000000c2 > > [ 538.798985] RAX: ffffffffffffffda RBX: 0000000001454650 RCX: 00007f12bdaebc8b > > [ 538.802840] RDX: 0000000000000018 RSI: 000000000145c150 RDI: 0000000001454650 > > [ 538.807093] RBP: 000000000145c150 R08: 00007f12bddaeba0 R09: 00007ffc7947cc46 > > [ 538.811487] R10: 0000000000000000 R11: 0000000000000206 R12: 00000000000002dd > > [ 538.816713] R13: 0000000000000018 R14: 0000000000000018 R15: 0000000000000000 > > [ 538.820437] Modules linked in: rpcrdma rdma_rxe ip6_udp_tunnel > > udp_tunnel rdma_ucm rdma_cm iw_cm ib_cm ib_uverbs ib_core cts > > rpcsec_gss_krb5 nfsv4 dns_resolver nfs lockd grace nfs_ssc nls_utf8 > > isofs fuse rfcomm nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib > > nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct > > nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 tun bridge stp llc > > ip6_tables nft_compat ip_set nf_tables nfnetlink bnep > > vmw_vsock_vmci_transport vsock snd_seq_midi snd_seq_midi_event > > intel_rapl_msr intel_rapl_common crct10dif_pclmul crc32_pclmul > > vmw_balloon ghash_clmulni_intel joydev pcspkr btusb uvcvideo btrtl > > btbcm btintel videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 > > videobuf2_common snd_ens1371 snd_ac97_codec ac97_bus snd_seq snd_pcm > > videodev bluetooth mc rfkill ecdh_generic ecc snd_timer snd_rawmidi > > snd_seq_device snd soundcore vmw_vmci i2c_piix4 auth_rpcgss sunrpc > > ip_tables xfs libcrc32c sr_mod cdrom sg crc32c_intel ata_generic > > serio_raw nvme vmwgfx drm_kms_helper > > [ 538.820577] syscopyarea sysfillrect sysimgblt fb_sys_fops cec > > nvme_core t10_pi ata_piix ahci libahci ttm vmxnet3 drm libata > > [ 538.869541] ---[ end trace 4abb2d95a72e9aab ]--- > > I'm running a v5.10-rc3 client now with the fix applied and > KASAN enabled. I traced my xfstests run and I'm definitely > exercising the LISTXATTRS path: > > # trace-cmd report -F rpc_request | grep LISTXATTR | wc -l > 462 > > No crash or KASAN splat. I'm still missing something. > > I sometimes apply small patches from the mailing list by hand > editing the modified file. Are you sure you applied my fix > correctly? Again I think the difference is the SoftRoce vs hardware (I still have no ability to test this on hardware). I ran tcp mount with KASAN and generic/013 doesn't trigger anything. Something about softRoCE (or iWarp) that either reveals a problem about the NFS code or perhaps it's softRoCE but KASAN is typically good in identifying the problematic spot. > > > -- > Chuck Lever > > >
