I'm running into the following oops running nfstest_posix tests on Trond's testing branch commit d5b9216fd5114be4ed98ca9c1ecc5f164cd8cf5e. I'll go ahead and see what patch introduced this but for another data point 5.2-rc5 was OK. unknown000C29789DA7 login: [ 2726.940822] BUG: kernel NULL pointer dereference, address: 0000000000000040 [ 2726.946600] #PF: supervisor read access in kernel mode [ 2726.949607] #PF: error_code(0x0000) - not-present page [ 2726.952974] PGD 0 P4D 0 [ 2726.954779] Oops: 0000 [#1] SMP PTI [ 2726.957452] CPU: 0 PID: 4556 Comm: python Not tainted 5.2.0-rc7+ #35 [ 2726.962258] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 04/13/2018 [ 2726.969821] RIP: 0010:nfs4_do_setattr+0x18f/0x420 [nfsv4] [ 2726.972969] Code: be 02 00 00 00 48 89 df 4c 89 fa e8 8b 93 01 00 84 c0 0f 85 30 01 00 00 48 8b 44 24 30 48 85 c0 0f 84 f7 00 00 00 48 8b 40 60 <48> 8b 40 40 f6 c4 02 0f 85 35 02 00 00 48 8b 7c 24 30 e8 0a 7a fa [ 2726.982348] RSP: 0018:ffffa303c270bad0 EFLAGS: 00010286 [ 2726.984766] RAX: 0000000000000000 RBX: ffff93237ab4fd98 RCX: ffffa303c270bb08 [ 2726.988368] RDX: ffffa303c270bbb8 RSI: 0000000000000002 RDI: 0000000000000000 [ 2726.992911] RBP: ffffa303c270bc28 R08: ffff9323729f1200 R09: 0000000000000000 [ 2726.997324] R10: 0008000000000000 R11: ffffffffc08f1d40 R12: ffff9323790c6800 [ 2727.001705] R13: ffffa303c270bba0 R14: 00000001002508f0 R15: ffffa303c270bbb8 [ 2727.006000] FS: 00007f867f7fb580(0000) GS:ffff93237cc00000(0000) knlGS:0000000000000000 [ 2727.010822] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2727.014354] CR2: 0000000000000040 CR3: 00000000031b0002 CR4: 00000000001606f0 [ 2727.018261] Call Trace: [ 2727.019565] nfs4_proc_setattr+0xb5/0x150 [nfsv4] [ 2727.021728] nfs_setattr+0xdf/0x1d0 [nfs] [ 2727.023654] notify_change+0x2cf/0x460 [ 2727.025865] do_truncate+0x74/0xc0 [ 2727.027399] path_openat+0xbe3/0xe40 [ 2727.029250] do_filp_open+0x93/0x100 [ 2727.030883] do_sys_open+0x186/0x220 [ 2727.032622] do_syscall_64+0x55/0x1a0 [ 2727.034353] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 2727.039647] RIP: 0033:0x7f867effa2af [ 2727.041899] Code: 52 89 f0 25 00 00 41 00 3d 00 00 41 00 74 44 8b 05 a6 d1 20 00 85 c0 75 65 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05 <48> 3d 00 f0 ff ff 0f 87 9d 00 00 00 48 8b 4c 24 28 64 48 33 0c 25 [ 2727.053137] RSP: 002b:00007fff329ec520 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 2727.057740] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f867effa2af [ 2727.061558] RDX: 0000000000000203 RSI: 000056124897a390 RDI: 00000000ffffff9c [ 2727.064591] RBP: 00005612485692f0 R08: 00005612489e0c30 R09: 0000000000000003 [ 2727.067803] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f867878e500 [ 2727.071309] R13: 00007f867df88fc0 R14: 00005612485692f0 R15: 00007f867f7b3b48 [ 2727.074347] Modules linked in: cts rpcsec_gss_krb5 nfsv4 dns_resolver nfs lockd grace fuse rfcomm bridge stp llc nf_tables nfnetlink bnep snd_seq_midi snd_seq_midi_event crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel vmw_balloon glue_helper crypto_simd cryptd btusb btrtl btbcm pcspkr btintel snd_ens1371 bluetooth snd_ac97_codec ac97_bus uvcvideo snd_seq videobuf2_vmalloc videobuf2_memops rfkill videobuf2_v4l2 snd_pcm videodev ecdh_generic snd_timer videobuf2_common ecc snd_rawmidi snd_seq_device snd soundcore vmw_vmci i2c_piix4 auth_rpcgss sunrpc ip_tables xfs libcrc32c sd_mod sr_mod cdrom vmwgfx ata_generic pata_acpi drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm crc32c_intel drm mptspi scsi_transport_spi mptscsih serio_raw i2c_core e1000 ata_piix mptbase libata dm_mirror dm_region_hash dm_log dm_mod [ 2727.104414] CR2: 0000000000000040 [ 2727.106856] ---[ end trace 67bd5a3a86242a9d ]---
