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use-after-free. [ 343.438660][ T1682] WARNING: CPU: 2 PID: 1682 at lib/refcount.c:28 refcou= nt_warn_saturate (lib/refcount.c:28 (discriminator 3))=20 [ 343.447798][ T1682] Modules linked in: nls_utf8 cifs cifs_arc4 nls_ucs2_= utils rdma_cm iw_cm ib_cm ib_core cifs_md4 dns_resolver snd_hda_codec_hdmi = snd_ctl_led btrfs snd_hda_codec_realtek snd_hda_codec_generic snd_hda_scode= c_component snd_soc_avs blake2b_generic xor snd_soc_hda_codec zstd_compress= snd_hda_ext_core raid6_pq intel_rapl_msr snd_soc_core intel_rapl_common sn= d_compress x86_pkg_temp_thermal snd_hda_intel sd_mod intel_powerclamp coret= emp dell_pc snd_intel_dspcfg sg platform_profile snd_intel_sdw_acpi kvm_int= el ipmi_devintf ipmi_msghandler i915 kvm dell_wmi snd_hda_codec ghash_clmul= ni_intel sha512_ssse3 dell_smbios intel_gtt cec drm_buddy sha256_ssse3 sha1= _ssse3 ttm snd_hda_core rfkill wmi_bmof mei_wdt dcdbas sparse_keymap dell_w= mi_descriptor rapl drm_display_helper snd_hwdep ahci intel_cstate snd_pcm l= ibahci drm_kms_helper mei_me intel_uncore snd_timer pcspkr intel_pch_therma= l libata snd video mei intel_pmc_core i2c_i801 soundcore i2c_smbus intel_vs= ec wmi pmt_telemetry acpi_pad pmt_class binfmt_misc loop fuse drm [ 343.447976][ T1682] dm_mod ip_tables [ 343.542088][ T1682] CPU: 2 UID: 0 PID: 1682 Comm: cifsd Not tainted 6.14= .0-rc4-00008-gdcd7ee93858c #1 [ 343.551316][ T1682] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS = 1.8.1 12/05/2017 [ 343.559415][ T1682] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (= discriminator 3))=20 [ 343.565344][ T1682] Code: 9f a1 b5 03 01 e8 26 99 cb fe 0f 0b eb b5 80 3d= 8c a1 b5 03 00 75 ac 48 c7 c7 20 83 53 84 c6 05 7c a1 b5 03 01 e8 06 99 cb= fe <0f> 0b eb 95 80 3d 6a a1 b5 03 00 75 8c 48 c7 c7 e0 83 53 84 c6 05 All code =3D=3D=3D=3D=3D=3D=3D=3D 0: 9f lahf 1: a1 b5 03 01 e8 26 99 movabs 0xfecb9926e80103b5,%eax 8: cb fe=20 a: 0f 0b ud2 c: eb b5 jmp 0xffffffffffffffc3 e: 80 3d 8c a1 b5 03 00 cmpb $0x0,0x3b5a18c(%rip) # 0x3b5a1a1 15: 75 ac jne 0xffffffffffffffc3 17: 48 c7 c7 20 83 53 84 mov $0xffffffff84538320,%rdi 1e: c6 05 7c a1 b5 03 01 movb $0x1,0x3b5a17c(%rip) # 0x3b5a1a1 25: e8 06 99 cb fe call 0xfffffffffecb9930 2a:* 0f 0b ud2 <-- trapping instruction 2c: eb 95 jmp 0xffffffffffffffc3 2e: 80 3d 6a a1 b5 03 00 cmpb $0x0,0x3b5a16a(%rip) # 0x3b5a19f 35: 75 8c jne 0xffffffffffffffc3 37: 48 c7 c7 e0 83 53 84 mov $0xffffffff845383e0,%rdi 3e: c6 .byte 0xc6 3f: 05 .byte 0x5 Code starting with the faulting instruction =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 0: 0f 0b ud2 2: eb 95 jmp 0xffffffffffffff99 4: 80 3d 6a a1 b5 03 00 cmpb $0x0,0x3b5a16a(%rip) # 0x3b5a175 b: 75 8c jne 0xffffffffffffff99 d: 48 c7 c7 e0 83 53 84 mov $0xffffffff845383e0,%rdi 14: c6 .byte 0xc6 15: 05 .byte 0x5 [ 343.584797][ T1682] RSP: 0018:ffffc900020bfac8 EFLAGS: 00010286 [ 343.590720][ T1682] RAX: 0000000000000000 RBX: ffff8887f912fee8 RCX: fff= fffff8277b84a [ 343.598547][ T1682] RDX: 1ffff110f0fe6ac8 RSI: 0000000000000008 RDI: fff= f888787f35640 [ 343.606377][ T1682] RBP: 0000000000000003 R08: 0000000000000001 R09: fff= ff52000417f0f [ 343.614205][ T1682] R10: ffffc900020bf87f R11: 0000000000000001 R12: 000= 0000000000000 [ 343.622033][ T1682] R13: 000000000000000a R14: ffff88810fa041c8 R15: fff= f8887f912fee8 [ 343.629861][ T1682] FS: 0000000000000000(0000) GS:ffff888787f00000(0000= ) knlGS:0000000000000000 [ 343.638643][ T1682] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 343.645082][ T1682] CR2: 0000564d628e7a48 CR3: 000000081aa6c003 CR4: 000= 00000003726f0 [ 343.652908][ T1682] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000= 0000000000000 [ 343.660735][ T1682] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 000= 0000000000400 [ 343.668560][ T1682] Call Trace: [ 343.671702][ T1682] [ 343.674497][ T1682] ? __warn (kernel/panic.c:748)=20 [ 343.678427][ T1682] ? refcount_warn_saturate (lib/refcount.c:28 (discrimi= nator 3))=20 [ 343.683742][ T1682] ? report_bug (lib/bug.c:180 lib/bug.c:219)=20 [ 343.688101][ T1682] ? handle_bug (arch/x86/kernel/traps.c:285)=20 [ 343.692286][ T1682] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discri= minator 1))=20 [ 343.696821][ T1682] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h= :574)=20 [ 343.701713][ T1682] ? llist_add_batch (lib/llist.c:33 (discriminator 14))= =20 [ 343.706426][ T1682] ? refcount_warn_saturate (lib/refcount.c:28 (discrimi= nator 3))=20 [ 343.711749][ T1682] ? refcount_warn_saturate (lib/refcount.c:28 (discrimi= nator 3))=20 [ 343.717070][ T1682] netfs_put_request (include/linux/refcount.h:275 inclu= de/linux/refcount.h:307 fs/netfs/objects.c:173)=20 [ 343.721874][ T1682] smb2_readv_callback (include/linux/instrumented.h:96 = include/linux/atomic/atomic-instrumented.h:400 include/linux/refcount.h:264= include/linux/refcount.h:307 include/linux/refcount.h:325 include/linux/kr= ef.h:64 fs/smb/client/cifsproto.h:744 fs/smb/client/smb2pdu.c:4621) cifs=20 [ 343.727715][ T1682] ? _raw_spin_lock (arch/x86/include/asm/atomic.h:107 i= nclude/linux/atomic/atomic-arch-fallback.h:2170 include/linux/atomic/atomic= -instrumented.h:1302 include/asm-generic/qspinlock.h:111 include/linux/spin= lock.h:187 include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:1= 54)=20 [ 343.732249][ T1682] ? __pfx__raw_spin_lock (kernel/locking/spinlock.c:153= )=20 [ 343.737303][ T1682] ? __pfx_smb2_readv_callback (fs/smb/client/smb2pdu.c:= 4505) cifs=20 [ 343.743566][ T1682] ? dequeue_mid (include/linux/list.h:215 include/linux= /list.h:287 fs/smb/client/connect.c:854) cifs=20 [ 343.748690][ T1682] cifs_demultiplex_thread (fs/smb/client/connect.c:1283= ) cifs=20 [ 343.754855][ T1682] ? __pfx_cifs_demultiplex_thread (fs/smb/client/connec= t.c:1143) cifs=20 [ 343.761451][ T1682] ? __pfx___schedule (kernel/sched/core.c:6646)=20 [ 343.766158][ T1682] ? _raw_spin_lock_irqsave (arch/x86/include/asm/atomic= .h:107 include/linux/atomic/atomic-arch-fallback.h:2170 include/linux/atomi= c/atomic-instrumented.h:1302 include/asm-generic/qspinlock.h:111 include/li= nux/spinlock.h:187 include/linux/spinlock_api_smp.h:111 kernel/locking/spin= lock.c:162)=20 [ 343.771386][ T1682] ? __kthread_parkme (arch/x86/include/asm/bitops.h:206= arch/x86/include/asm/bitops.h:238 include/asm-generic/bitops/instrumented-= non-atomic.h:142 kernel/kthread.c:291)=20 [ 343.776179][ T1682] ? __pfx_cifs_demultiplex_thread (fs/smb/client/connec= t.c:1143) cifs=20 [ 343.782774][ T1682] kthread (kernel/kthread.c:464)=20 [ 343.786699][ T1682] ? __pfx_kthread (kernel/kthread.c:413)=20 [ 343.791143][ T1682] ? __pfx__raw_spin_lock_irq (kernel/locking/spinlock.c= :169)=20 [ 343.796544][ T1682] ? __pfx_kthread (kernel/kthread.c:413)=20 [ 343.800989][ T1682] ret_from_fork (arch/x86/kernel/process.c:148)=20 [ 343.805265][ T1682] ? __pfx_kthread (kernel/kthread.c:413)=20 [ 343.809714][ T1682] ret_from_fork_asm (arch/x86/entry/entry_64.S:257)=20 [ 343.814337][ T1682] [ 343.817220][ T1682] ---[ end trace 0000000000000000 ]--- [ 343.975682][ T287] generic/214 _check_dmesg: something found in d= mesg (see /lkp/benchmarks/xfstests/results//generic/214.dmesg) [ 343.975695][ T287] [ 343.992249][ T287] - output mismatch (see /lkp/benchmarks/xfstests/resu= lts//generic/214.out.bad) [ 343.992259][ T287] [ 344.004869][ T287] --- tests/generic/214.out 2024-12-15 06:14:52.00= 0000000 +0000 [ 344.004879][ T287] [ 344.017021][ T287] +++ /lkp/benchmarks/xfstests/results//generic/21= 4.out.bad 2025-03-22 22:47:49.975533744 +0000 [ 344.017032][ T287] [ 344.030312][ T287] @@ -33,11 +33,7 @@ [ 344.030321][ T287] [ 344.037642][ T287] =3D=3D=3D falloc, write, sync, truncate, read = =3D=3D=3D [ 344.037651][ T287] [ 344.047135][ T287] wrote 65536/65536 bytes at offset 73728 [ 344.047144][ T287] [ 344.056685][ T287] XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and X= XX ops/sec) [ 344.056695][ T287] [ 344.068253][ T287] -00000000: 00 00 00 00 00 00 00 00 00 00 00 00 = 00 00 00 00 ................ [ 344.068263][ T287] [ 344.079832][ T287] -* [ 344.079841][ T287] [ 344.086467][ T287] -00012000: aa aa aa aa aa aa aa aa aa aa aa aa = aa aa aa aa ................ [ 344.086477][ T287] [ 344.098043][ T287] -* [ 344.098051][ T287] [ 344.103114][ T287] ... [ 344.103122][ T287] [ 344.111416][ T287] (Run 'diff -u /lkp/benchmarks/xfstests/tests/gen= eric/214.out /lkp/benchmarks/xfstests/results//generic/214.out.bad' to see= the entire diff) [ 344.111426][ T287] [ 344.128641][ T287] Ran: generic/214 [ 344.128649][ T287] [ 344.134850][ T287] Failures: generic/214 [ 344.134858][ T287] [ 344.141454][ T287] Failed 1 of 1 tests The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250324/202503241538.c2138272-lkp@= intel.com --=20 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki