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use-after-free. [ 202.815386][ T801] WARNING: CPU: 30 PID: 801 at lib/refcount.c:87 refcount_dec_and_lock (lib/refcount.c:87 lib/refcount.c:146) [ 202.824562][ T801] Modules linked in: kmem rpcsec_gss_krb5 nfsv4 dns_resolver nfsd auth_rpcgss xfs intel_rapl_msr intel_rapl_common intel_uncore_frequency intel_uncore_frequency_common device_dax nd_pmem nd_btt dax_pmem i10nm_edac skx_edac_common x86_pkg_temp_thermal intel_powerclamp btrfs blake2b_generic coretemp xor raid6_pq sd_mod kvm_intel sg kvm snd_pcm irqbypass ghash_clmulni_intel snd_timer ahci dax_hmem rapl ast snd cxl_acpi libahci ipmi_ssif intel_cstate acpi_power_meter drm_client_lib cxl_port cxl_core intel_th_gth drm_shmem_helper mei_me soundcore isst_if_mmio isst_if_mbox_pci intel_uncore ipmi_si i2c_i801 ioatdma acpi_ipmi libata intel_th_pci einj pcspkr drm_kms_helper mei isst_if_common i2c_smbus intel_pch_thermal intel_th intel_vsec nfit wmi dca ipmi_devintf libnvdimm ipmi_msghandler acpi_pad joydev binfmt_misc drm fuse dm_mod loop ip_tables [ 202.828256][ T815] ------------[ cut here ]------------ [ 202.900301][ T801] CPU: 30 UID: 0 PID: 801 Comm: kworker/u513:4 Not tainted 6.15.0-rc7-00105-g6f1433fc8dc2 #1 VOLUNTARY [ 202.905608][ T815] WARNING: CPU: 70 PID: 815 at fs/nfsd/nfs4state.c:1047 nfs4_free_deleg (fs/nfsd/nfs4state.c:1047 (discriminator 1)) nfsd [ 202.916555][ T801] Workqueue: rpciod rpc_async_schedule [ 202.926199][ T815] Modules linked in: kmem rpcsec_gss_krb5 nfsv4 dns_resolver nfsd [ 202.931511][ T801] [ 202.931512][ T801] RIP: 0010:refcount_dec_and_lock (lib/refcount.c:87 lib/refcount.c:146) [ 202.932691][ T815] auth_rpcgss xfs [ 202.940344][ T801] Code: 55 1e 9d 01 01 e8 82 fd 94 ff 0f 0b eb c8 80 3d 42 1e 9d 01 00 75 9c 48 c7 c7 30 d8 ac 82 c6 05 32 1e 9d 01 01 e8 62 fd 94 ff <0f> 0b eb 85 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 All code ======== 0: 55 push %rbp 1: 1e (bad) 2: 9d popf 3: 01 01 add %eax,(%rcx) 5: e8 82 fd 94 ff call 0xffffffffff94fd8c a: 0f 0b ud2 c: eb c8 jmp 0xffffffffffffffd6 e: 80 3d 42 1e 9d 01 00 cmpb $0x0,0x19d1e42(%rip) # 0x19d1e57 15: 75 9c jne 0xffffffffffffffb3 17: 48 c7 c7 30 d8 ac 82 mov $0xffffffff82acd830,%rdi 1e: c6 05 32 1e 9d 01 01 movb $0x1,0x19d1e32(%rip) # 0x19d1e57 25: e8 62 fd 94 ff call 0xffffffffff94fd8c 2a:* 0f 0b ud2 <-- trapping instruction 2c: eb 85 jmp 0xffffffffffffffb3 2e: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 35: 00 00 00 38: 0f 1f 40 00 nopl 0x0(%rax) 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: eb 85 jmp 0xffffffffffffff89 4: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) b: 00 00 00 e: 0f 1f 40 00 nopl 0x0(%rax) 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop [ 202.942535][ T815] intel_rapl_msr intel_rapl_common intel_uncore_frequency [ 202.948281][ T801] RSP: 0018:ffa0000008987d90 EFLAGS: 00010282 [ 202.949557][ T1502] /usr/bin/wget -q --timeout=3600 --tries=1 --local-encoding=UTF-8 http://internal-lkp-server:80/~lkp/cgi-bin/lkp-jobfile-append-var?job_file=/lkp/jobs/scheduled/lkp-icl-2sp6/filebench-performance-1HDD-xfs-nfsv4-cvar_example.f-debian-12-x86_64-20240206.cgz-6f1433fc8dc2-20250528-100439-vlpvt2-0.yaml&job_state=post_run -O /dev/null [ 202.949560][ T1502] [ 202.951860][ T815] intel_uncore_frequency_common device_dax nd_pmem [ 202.971301][ T801] [ 202.978343][ T815] nd_btt dax_pmem i10nm_edac [ 202.984263][ T801] RAX: 0000000000000000 RBX: ff110002564719d0 RCX: 0000000000000000 [ 203.014960][ T815] skx_edac_common x86_pkg_temp_thermal intel_powerclamp btrfs blake2b_generic coretemp [ 203.017153][ T801] RDX: ff1100103f9a9f40 RSI: ff1100103f99bd80 RDI: ff1100103f99bd80 [ 203.017154][ T801] RBP: ff1100109035a330 R08: 0000000000000000 R09: 0000000000000003 [ 203.023593][ T815] xor raid6_pq sd_mod kvm_intel sg [ 203.025784][ T801] R10: ffa0000008987c30 R11: ffffffff831e50c8 R12: ff11001090359fb0 [ 203.030308][ T815] kvm snd_pcm irqbypass ghash_clmulni_intel [ 203.038136][ T801] R13: ff110002566d9728 R14: 0000000000000001 R15: 0000000004248060 [ 203.047695][ T815] snd_timer ahci dax_hmem rapl [ 203.055520][ T801] FS: 0000000000000000(0000) GS:ff110010bbb55000(0000) knlGS:0000000000000000 [ 203.063348][ T815] ast snd cxl_acpi [ 203.068400][ T801] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 203.076223][ T815] libahci ipmi_ssif intel_cstate acpi_power_meter drm_client_lib [ 203.082056][ T801] CR2: 00005555555733c0 CR3: 000000207de24002 CR4: 0000000000773ef0 [ 203.089881][ T815] cxl_port cxl_core intel_th_gth [ 203.094581][ T801] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 203.103361][ T815] drm_shmem_helper [ 203.107026][ T801] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 203.113464][ T815] mei_me soundcore isst_if_mmio [ 203.121118][ T801] PKRU: 55555554 [ 203.128942][ T815] isst_if_mbox_pci intel_uncore ipmi_si i2c_i801 ioatdma [ 203.133822][ T801] Call Trace: [ 203.141649][ T815] acpi_ipmi libata intel_th_pci [ 203.145314][ T801] [ 203.153138][ T815] einj pcspkr drm_kms_helper mei isst_if_common i2c_smbus [ 203.157935][ T801] nfs4_put_stid (fs/nfsd/nfs4state.c:1264) nfsd [ 203.161338][ T815] intel_pch_thermal intel_th intel_vsec nfit [ 203.168299][ T801] nfsd41_destroy_cb (fs/nfsd/nfs4callback.c:1167 fs/nfsd/nfs4callback.c:1403) nfsd [ 203.171442][ T815] wmi dca ipmi_devintf libnvdimm [ 203.176239][ T801] rpc_free_task (net/sunrpc/sched.c:1190) [ 203.179037][ T815] ipmi_msghandler acpi_pad joydev [ 203.186082][ T801] __rpc_execute (include/linux/sched.h:1842 net/sunrpc/sched.c:1005) [ 203.190962][ T815] binfmt_misc [ 203.196882][ T801] rpc_async_schedule (include/linux/sched/mm.h:339 include/linux/sched/mm.h:399 net/sunrpc/sched.c:1035) [ 203.202192][ T815] drm fuse dm_mod loop ip_tables [ 203.207073][ T801] process_one_work (kernel/workqueue.c:3243) [ 203.211343][ T815] CPU: 70 UID: 0 PID: 815 Comm: kworker/u513:15 Not tainted 6.15.0-rc7-00105-g6f1433fc8dc2 #1 VOLUNTARY [ 203.216311][ T801] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400) [ 203.220758][ T815] Workqueue: rpciod rpc_async_schedule [ 203.223990][ T801] ? __pfx_worker_thread (kernel/workqueue.c:3346) [ 203.228696][ T815] [ 203.228698][ T815] RIP: 0010:nfs4_free_deleg (fs/nfsd/nfs4state.c:1047 (discriminator 1)) nfsd [ 203.233576][ T801] kthread (kernel/kthread.c:464) [ 203.238279][ T815] Code: 75 46 48 8b 3d c9 50 1e 00 e8 b4 33 0b c0 f0 48 ff 0d a4 50 1e 00 c3 cc cc cc cc 0f 0b 48 8b 56 48 48 8d 46 48 48 39 c2 74 be <0f> 0b 48 8b 56 58 48 8d 46 58 48 39 c2 74 bc 0f 0b 48 8b 56 68 48 All code ======== 0: 75 46 jne 0x48 2: 48 8b 3d c9 50 1e 00 mov 0x1e50c9(%rip),%rdi # 0x1e50d2 9: e8 b4 33 0b c0 call 0xffffffffc00b33c2 e: f0 48 ff 0d a4 50 1e lock decq 0x1e50a4(%rip) # 0x1e50ba 15: 00 16: c3 ret 17: cc int3 18: cc int3 19: cc int3 1a: cc int3 1b: 0f 0b ud2 1d: 48 8b 56 48 mov 0x48(%rsi),%rdx 21: 48 8d 46 48 lea 0x48(%rsi),%rax 25: 48 39 c2 cmp %rax,%rdx 28: 74 be je 0xffffffffffffffe8 2a:* 0f 0b ud2 <-- trapping instruction 2c: 48 8b 56 58 mov 0x58(%rsi),%rdx 30: 48 8d 46 58 lea 0x58(%rsi),%rax 34: 48 39 c2 cmp %rax,%rdx 37: 74 bc je 0xfffffffffffffff5 39: 0f 0b ud2 3b: 48 8b 56 68 mov 0x68(%rsi),%rdx 3f: 48 rex.W Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 48 8b 56 58 mov 0x58(%rsi),%rdx 6: 48 8d 46 58 lea 0x58(%rsi),%rax a: 48 39 c2 cmp %rax,%rdx d: 74 bc je 0xffffffffffffffcb f: 0f 0b ud2 11: 48 8b 56 68 mov 0x68(%rsi),%rdx 15: 48 rex.W The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250529/202505291332.f6944aed-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki