Hi, Recently I always hit nfs crash[1] on latest mainline upstream linux 6.15.0-rc5+, which HEAD=707df3375124b51048233625a7e1c801e8c8a7fd . I've hit this bug on aarch64 and x86_64 several times, by running xfstests on nfsv4.2 [2]. Thanks, Zorro [1] [ 1004.936621] run fstests generic/023 at 2025-05-07 11:06:07 [ 1005.840825] ------------[ cut here ]------------ [ 1005.845547] kernel BUG at kernel/cred.c:104! [ 1005.849848] Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI [ 1005.855440] CPU: 12 UID: 0 PID: 78471 Comm: kworker/u128:20 Not tainted 6.15.0-rc5+ #1 PREEMPT(voluntary) [ 1005.865104] Hardware name: Dell Inc. PowerEdge R660/0R5JJC, BIOS 2.1.5 03/14/2024 [ 1005.872583] Workqueue: nfslocaliod nfs_local_call_write [nfs] [ 1005.878416] RIP: 0010:__put_cred+0xea/0x120 [ 1005.882618] Code: 2d 8b 83 a8 00 00 00 85 c0 74 0b 48 83 c4 08 5b 5d e9 fa fb ff ff 48 83 c4 08 48 c7 c6 c0 af da 83 5b 5d e9 28 54 1d 00 0f 0b <0f> 0b 0f 0b 48 89 3c 24 e8 09 dc 99 00 48 8b 3c 24 eb c4 48 89 df [ 1005.901383] RSP: 0018:ffa00000247a78d8 EFLAGS: 00010246 [ 1005.906626] RAX: dffffc0000000000 RBX: ff110001428ea000 RCX: ffffffff83dab30c [ 1005.913757] RDX: 1fe220004203d19a RSI: 0000000000000008 RDI: ff110002101e8cd0 [ 1005.920892] RBP: ff110002101e8000 R08: 0000000000000000 R09: ffe21c002851d400 [ 1005.928024] R10: ff110001428ea007 R11: 0000000000000001 R12: 0000000000000000 [ 1005.935157] R13: ff110001f6c1ce88 R14: ff110001f6c1ce68 R15: ff110001f6c1ce00 [ 1005.942289] FS: 0000000000000000(0000) GS:ff110008938c7000(0000) knlGS:0000000000000000 [ 1005.950376] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1005.956122] CR2: 00007f619475fdc0 CR3: 00000003f6c76004 CR4: 0000000000f73ef0 [ 1005.963256] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1005.970388] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400 [ 1005.977520] PKRU: 55555554 [ 1005.980234] Call Trace: [ 1005.982685] <TASK> [ 1005.984794] __fput+0x61e/0xaa0 [ 1005.987958] nfsd_file_free+0x1a1/0x3e0 [nfsd] [ 1005.992505] nfsd_file_put_local+0x35/0x50 [nfsd] [ 1005.997290] nfs_close_local_fh+0x362/0x6f0 [nfs_localio] [ 1006.002709] __put_nfs_open_context+0x380/0x500 [nfs] [ 1006.007813] ? nfs_write_completion+0x111/0x8a0 [nfs] [ 1006.012926] nfs_pgio_header_free+0x41/0xe0 [nfs] [ 1006.017693] nfs_write_completion+0x139/0x8a0 [nfs] [ 1006.022631] ? __pfx_nfs_writeback_done.part.0+0x10/0x10 [nfs] [ 1006.028517] ? __pfx_nfs_write_completion+0x10/0x10 [nfs] [ 1006.033981] nfs_local_call_write+0x4fc/0xa50 [nfs] [ 1006.038918] ? __pfx_nfs_local_call_write+0x10/0x10 [nfs] [ 1006.044376] ? rcu_is_watching+0x15/0xb0 [ 1006.048320] ? rcu_is_watching+0x15/0xb0 [ 1006.052246] process_one_work+0xd6e/0x1330 [ 1006.056349] ? __pfx_process_one_work+0x10/0x10 [ 1006.060897] ? assign_work+0x16c/0x240 [ 1006.064668] worker_thread+0x5f3/0xfe0 [ 1006.068437] ? __kthread_parkme+0xb4/0x200 [ 1006.072553] ? __pfx_worker_thread+0x10/0x10 [ 1006.076842] kthread+0x3b1/0x770 [ 1006.080077] ? local_clock_noinstr+0xd/0xe0 [ 1006.084278] ? __pfx_kthread+0x10/0x10 [ 1006.088032] ? __lock_release.isra.0+0x1a4/0x2c0 [ 1006.092667] ? rcu_is_watching+0x15/0xb0 [ 1006.096611] ? __pfx_kthread+0x10/0x10 [ 1006.100382] ret_from_fork+0x31/0x70 [ 1006.103978] ? __pfx_kthread+0x10/0x10 [ 1006.107738] ret_from_fork_asm+0x1a/0x30 [ 1006.111687] </TASK> [ 1006.113894] Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfs netfs rpcrdma rdma_cm iw_cm ib_cm ib_core nfsd auth_rpcgss nfs_acl lockd grace nfs_localio rfkill intel_rapl_msr intel_rapl_common intel_uncore_frequency intel_uncore_frequency_common intel_ifs sunrpc i10nm_edac skx_edac_common nfit x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm dax_hmem irqbypass cxl_acpi iTCO_wdt igb mgag200 cxl_port rapl dell_pc pmt_telemetry iTCO_vendor_support pmt_class cxl_core intel_sdsi dell_smbios platform_profile intel_cstate ipmi_ssif ses isst_if_mmio dcdbas wmi_bmof dell_wmi_descriptor pcspkr intel_uncore enclosure einj isst_if_mbox_pci mei_me isst_if_common intel_vsec i2c_i801 i2c_algo_bit tg3 dca mei i2c_smbus i2c_ismt acpi_power_meter ipmi_si acpi_ipmi ipmi_devintf ipmi_msghandler sg fuse loop dm_mod nfnetlink xfs sd_mod iaa_crypto mpt3sas ahci raid_class ghash_clmulni_intel libahci scsi_transport_sas idxd libata idxd_bus wmi pinctrl_emmitsburg [ 1006.198764] ---[ end trace 0000000000000000 ]--- [ 1006.223531] RIP: 0010:__put_cred+0xea/0x120 [ 1006.227744] Code: 2d 8b 83 a8 00 00 00 85 c0 74 0b 48 83 c4 08 5b 5d e9 fa fb ff ff 48 83 c4 08 48 c7 c6 c0 af da 83 5b 5d e9 28 54 1d 00 0f 0b <0f> 0b 0f 0b 48 89 3c 24 e8 09 dc 99 00 48 8b 3c 24 eb c4 48 89 df [ 1006.246509] RSP: 0018:ffa00000247a78d8 EFLAGS: 00010246 [ 1006.251762] RAX: dffffc0000000000 RBX: ff110001428ea000 RCX: ffffffff83dab30c [ 1006.258911] RDX: 1fe220004203d19a RSI: 0000000000000008 RDI: ff110002101e8cd0 [ 1006.266065] RBP: ff110002101e8000 R08: 0000000000000000 R09: ffe21c002851d400 [ 1006.273218] R10: ff110001428ea007 R11: 0000000000000001 R12: 0000000000000000 [ 1006.280368] R13: ff110001f6c1ce88 R14: ff110001f6c1ce68 R15: ff110001f6c1ce00 [ 1006.287521] FS: 0000000000000000(0000) GS:ff110008938c7000(0000) knlGS:0000000000000000 [ 1006.295623] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1006.301387] CR2: 00007f619475fdc0 CR3: 00000003f6c76004 CR4: 0000000000f73ef0 [ 1006.308535] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1006.315687] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400 [ 1006.322836] PKRU: 55555554 [ 1006.325569] Kernel panic - not syncing: Fatal exception [ 1006.330842] Kernel Offset: 0x2800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 1006.361714] ---[ end Kernel panic - not syncing: Fatal exception ]--- [-- MARK -- Wed May 7 15:10:00 2025] [-- MARK -- Wed May 7 15:15:00 2025] [2] export FSTYP=nfs export TEST_DEV=xxxxxxx.xxxxxxxxxx.xxxxxxxxxxxx:/mnt/xfstests/test/nfs-server export TEST_DIR=/mnt/xfstests/test/nfs-client export SCRATCH_DEV=xxxxxxx.xxxxxxxxxx.xxxxxxxxxxxx:/mnt/xfstests/scratch/nfs-server export SCRATCH_MNT=/mnt/xfstests/scratch/nfs-client export MOUNT_OPTIONS="-o vers=4.2" export TEST_FS_MOUNT_OPTS="-o vers=4.2"
