On 04/23, Nicolai Stange wrote: >Hi Xiaolong, > >I'm encountering some difficulties running the reproducer, see below. >Any help is very welcome! >
Thanks for watching the report and trying the reproducer. > >On Tue, Apr 18 2017, kernel test robot wrote: > >> [ 45.772683] BUG: unable to handle kernel NULL pointer dereference at >> 0000000000000010 ><snip> >> [ 45.772697] IP: __debugfs_remove+0x5c/0xc0 >> [ 45.772743] Call Trace: >> [ 45.772750] debugfs_remove_recursive+0xd4/0x1e0 >> [ 45.772758] rpc_clnt_debugfs_unregister+0x19/0x30 >> [ 45.772762] rpc_client_register+0x18a/0x1c0 >> [ 45.772765] rpc_new_client+0x1de/0x2e0 >> [ 45.772768] rpc_create_xprt+0x58/0x170 >> [ 45.772769] rpc_create+0xea/0x1c0 >> [ 45.772776] nfs_create_rpc_client+0xe8/0x130 >> [ 45.772814] nfs4_init_client+0x7e/0x290 [nfsv4] >> [ 45.772820] ? __radix_tree_replace+0x8a/0x140 >> [ 45.772823] ? radix_tree_iter_tag_clear+0x1c/0x20 >> [ 45.772827] ? __rpc_init_priority_wait_queue+0x81/0xb0 >> [ 45.772830] ? rpc_init_wait_queue+0x13/0x20 >> [ 45.772847] ? nfs4_alloc_client+0x1d2/0x1e0 [nfsv4] ><snip> >> [ 45.772985] Code: 8b 7c 24 30 48 89 de e8 f3 28 e6 ff 48 89 df e8 3b >> 22 e5 ff 4c 8b 63 78 48 c7 c2 20 d7 3b 82 48 c7 c6 e0 9f c9 81 49 8d >> 7c 24 18 <41> c7 44 24 10 00 00 00 00 4d 8d 6c 24 10 e8 a1 b6 cc ff 49 >> 8d > >Ok, that's > > 41 c7 44 24 10 00 00 movl $0x0,0x10(%r12) > >which is probably the init_completion() in __debugfs_remove_file(): > > fsd = dentry->d_fsdata; > init_completion(&fsd->active_users_drained); > >This would mean that fsd == NULL and this can happen only if the dentry >in question isn't a regular file but a symlink or whatever. So, an >additional d_is_reg() is needed here. I'll fix this in the next >iteration once I got the reproducer working. > > >> To reproduce: >> >> git clone https://github.com/01org/lkp-tests.git >> cd lkp-tests >> bin/lkp qemu -k <bzImage> job-script # job-script is attached in >> this email >> > >This gives > > make: Entering directory '/home/nic/lkp-tests/bin/event' > gcc -c -o wakeup.o wakeup.c > gcc -o wakeup wakeup.o > rm -f wakeup.o > strip wakeup > make: Leaving directory '/home/nic/lkp-tests/bin/event' > cpio: root:lkp: invalid group > cpio: root:lkp: invalid group > cpio: root:lkp: invalid group > gzip: /home/nic/.lkp/cache/lkp-x86_64.cpio: No such file or directory > mv: cannot stat ‘/home/nic/.lkp/cache/lkp-x86_64.cpio.gz’: No such file or > directory > mv: cannot stat ‘/home/nic/.lkp/cache/lkp-x86_64.cgz’: No such file or > directory > result_root: > /home/nic/.lkp//result/boot/1/vm-lkp-nex04-8G/debian-x86_64-2016-08-31.cgz/x86_64-rhel-7.2/gcc-6/f3e7155d085591ab58f0993ce633fea58c082b35/3 > downloading initrds ... > /usr/bin/wget -q --local-encoding=UTF-8 --retry-connrefused --waitretry 1000 > --tries 1000 > https://github.com/0day-ci/lkp-qemu/raw/master/osimage/debian/debian-x86_64-2016-08-31.cgz > -N -P /home/nic/.lkp/cache/osimage/debian > /usr/bin/wget -q --local-encoding=UTF-8 --retry-connrefused --waitretry 1000 > --tries 1000 > https://github.com/0day-ci/lkp-qemu/raw/master/osimage/deps/debian-x86_64-2016-08-31.cgz/lkp_2017-04-01.cgz > -N -P /home/nic/.lkp/cache/osimage/deps/debian-x86_64-2016-08-31.cgz > Failed to download > osimage/deps/debian-x86_64-2016-08-31.cgz/lkp_2017-04-01.cgz > >Manual download of that very last lkp_2017-04-01.cgz file results in a 404 >error. Please let me know if you need more details. It's most likely we haven't upload the lkp_2017-04-01.cgz file to github. I'll check it and get back to you later. Thanks, Xiaolong > > >Thank you! > >Nicolai
