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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, we noticed the WARN added in this commit is hit in our tests. not sure if i= t's expected. below full report FYI. kernel test robot noticed "WARNING:at_include/linux/mm.h:#skb_append_pagefr= ags" on: commit: 6431f06eecf44e7b8d42237cb0e166a456f491ad ("mm, slab: warn when incr= easing refcount on large kmalloc page") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master [test failed on linux-next/master 7bac2c97af4078d7a627500c9bcdd5b033f97718] in testcase: blktests version: blktests-x86_64-613b837-1_20250520 with following parameters: disk: 1SSD test: nvme-group-00 nvme_trtype: rdma use_siw: true config: x86_64-rhel-9.4-func compiler: gcc-12 test machine: 8 threads Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz (Skylake) w= ith 16G memory (please refer to attached dmesg/kmsg for entire log/backtrace) If you fix the issue in a separate patch/commit (i.e. not just a new versio= n of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202505221248.595a9117-lkp@intel.co= m [ 130.177740][ T2674] ------------[ cut here ]------------ [ 130.183066][ T2674] WARNING: CPU: 6 PID: 2674 at include/linux/mm.h:1552 = skb_append_pagefrags (kbuild/obj/consumer/x86_64-rhel-9.4-func/include/linu= x/mm.h:1552 kbuild/obj/consumer/x86_64-rhel-9.4-func/net/core/skbuff.c:4518= )=20 [ 130.192642][ T2674] Modules linked in: siw ib_uverbs nvmet_rdma nvmet nv= me_rdma nvme_fabrics rdma_cm nvme_auth nvme_core iw_cm ib_cm ib_core xfs dm= _multipath btrfs blake2b_generic xor zstd_compress raid6_pq intel_rapl_msr = intel_rapl_common x86_pkg_temp_thermal intel_powerclamp snd_soc_avs snd_hda= _codec_hdmi coretemp snd_soc_hda_codec snd_hda_ext_core sd_mod snd_ctl_led = snd_soc_core sg snd_hda_codec_realtek kvm_intel snd_hda_codec_generic snd_c= ompress ipmi_devintf snd_hda_scodec_component ipmi_msghandler i915 kvm snd_= hda_intel snd_intel_dspcfg snd_intel_sdw_acpi intel_gtt snd_hda_codec cec i= rqbypass ghash_clmulni_intel drm_buddy snd_hda_core sha512_ssse3 ttm snd_hw= dep sha256_ssse3 drm_display_helper sha1_ssse3 snd_pcm ahci mei_wdt drm_cli= ent_lib drm_kms_helper rapl libahci mei_me snd_timer intel_cstate video wmi= _bmof i2c_i801 snd intel_uncore mei pcspkr soundcore i2c_smbus libata serio= _raw intel_pmc_core intel_pch_thermal intel_vsec pmt_telemetry wmi acpi_pad= pmt_class binfmt_misc drm fuse loop dm_mod ip_tables [ 130.192875][ T2674] [last unloaded: ib_uverbs] [ 130.286562][ T2674] CPU: 6 UID: 0 PID: 2674 Comm: siw_tx/6 Tainted: G S = 6.15.0-rc3-00001-g6431f06eecf4 #1 PREEMPT(voluntary) [ 130.299313][ T2674] Tainted: [S]=3DCPU_OUT_OF_SPEC [ 130.303929][ T2674] Hardware name: HP HP Z240 SFF Workstation/802E, BIOS= N51 Ver. 01.63 10/05/2017 [ 130.312877][ T2674] RIP: 0010:skb_append_pagefrags (kbuild/obj/consumer/x= 86_64-rhel-9.4-func/include/linux/mm.h:1552 kbuild/obj/consumer/x86_64-rhel= -9.4-func/net/core/skbuff.c:4518)=20 [ 130.318708][ T2674] Code: a2 ff ff 48 8b 4c 24 18 4c 8b 4c 24 10 8b 54 24= 08 4c 8b 14 24 e9 1b fb ff ff 4c 8d 60 ff e9 47 fb ff ff 0f 0b e9 bb fb ff= ff <0f> 0b e9 7b fb ff ff b8 a6 ff ff ff e9 d7 fc ff ff 0f 0b 31 ff e9 All code =3D=3D=3D=3D=3D=3D=3D=3D 0: a2 ff ff 48 8b 4c 24 movabs %al,0x4c18244c8b48ffff 7: 18 4c=20 9: 8b 4c 24 10 mov 0x10(%rsp),%ecx d: 8b 54 24 08 mov 0x8(%rsp),%edx 11: 4c 8b 14 24 mov (%rsp),%r10 15: e9 1b fb ff ff jmp 0xfffffffffffffb35 1a: 4c 8d 60 ff lea -0x1(%rax),%r12 1e: e9 47 fb ff ff jmp 0xfffffffffffffb6a 23: 0f 0b ud2 25: e9 bb fb ff ff jmp 0xfffffffffffffbe5 2a:* 0f 0b ud2 <-- trapping instruction 2c: e9 7b fb ff ff jmp 0xfffffffffffffbac 31: b8 a6 ff ff ff mov $0xffffffa6,%eax 36: e9 d7 fc ff ff jmp 0xfffffffffffffd12 3b: 0f 0b ud2 3d: 31 ff xor %edi,%edi 3f: e9 .byte 0xe9 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: e9 7b fb ff ff jmp 0xfffffffffffffb82 7: b8 a6 ff ff ff mov $0xffffffa6,%eax c: e9 d7 fc ff ff jmp 0xfffffffffffffce8 11: 0f 0b ud2 13: 31 ff xor %edi,%edi 15: e9 .byte 0xe9 [ 130.338106][ T2674] RSP: 0018:ffffc90000ec7220 EFLAGS: 00010246 [ 130.344005][ T2674] RAX: 00000000000000f8 RBX: ffffea00086b0000 RCX: fff= f8883ffd08840 [ 130.351795][ T2674] RDX: 0000000000000001 RSI: 1ffffd40010d6006 RDI: fff= fea00086b0030 [ 130.359609][ T2674] RBP: ffff8883ffd08780 R08: 0000000000000011 R09: fff= f8883ffd08848 [ 130.367426][ T2674] R10: 0000000000000001 R11: 0000000000000001 R12: fff= fea00086b0000 [ 130.375247][ T2674] R13: 0000000000000001 R14: 0000000000001000 R15: 000= 0000000000000 [ 130.383044][ T2674] FS: 0000000000000000(0000) GS:ffff888426d45000(0000= ) knlGS:0000000000000000 [ 130.391798][ T2674] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 130.398234][ T2674] CR2: 000055b575c2cd28 CR3: 000000043c06e004 CR4: 000= 00000003726f0 [ 130.406050][ T2674] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000= 0000000000000 [ 130.413861][ T2674] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 000= 0000000000400 [ 130.421668][ T2674] Call Trace: [ 130.424805][ T2674] [ 130.427594][ T2674] ? __pfx_tcp_established_options (kbuild/obj/consumer/= x86_64-rhel-9.4-func/net/ipv4/tcp_output.c:989)=20 [ 130.433409][ T2674] skb_splice_from_iter (kbuild/obj/consumer/x86_64-rhel= -9.4-func/net/core/skbuff.c:7256)=20 [ 130.438455][ T2674] ? __pfx_skb_splice_from_iter (kbuild/obj/consumer/x86= _64-rhel-9.4-func/net/core/skbuff.c:7223)=20 [ 130.444015][ T2674] ? __sk_mem_raise_allocated (kbuild/obj/consumer/x86_6= 4-rhel-9.4-func/net/core/sock.c:3335)=20 [ 130.449674][ T2674] ? __sk_mem_schedule (kbuild/obj/consumer/x86_64-rhel-= 9.4-func/net/core/sock.c:3353)=20 [ 130.454470][ T2674] tcp_sendmsg_locked (kbuild/obj/consumer/x86_64-rhel-9= .4-func/net/ipv4/tcp.c:1275)=20 [ 130.459521][ T2674] ? tcp_sendmsg (kbuild/obj/consumer/x86_64-rhel-9.4-fu= nc/net/ipv4/tcp.c:1370)=20 [ 130.463786][ T2674] ? sock_sendmsg (kbuild/obj/consumer/x86_64-rhel-9.4-f= unc/net/socket.c:712 kbuild/obj/consumer/x86_64-rhel-9.4-func/net/socket.c:= 727 kbuild/obj/consumer/x86_64-rhel-9.4-func/net/socket.c:750)=20 [ 130.468307][ T2674] ? __pfx_tcp_sendmsg_locked (kbuild/obj/consumer/x86_6= 4-rhel-9.4-func/net/ipv4/tcp.c:1061)=20 [ 130.473697][ T2674] ? __pfx_sock_sendmsg (kbuild/obj/consumer/x86_64-rhel= -9.4-func/net/socket.c:739)=20 [ 130.478561][ T2674] ? _raw_spin_lock_bh (kbuild/obj/consumer/x86_64-rhel-= 9.4-func/arch/x86/include/asm/atomic.h:107 kbuild/obj/consumer/x86_64-rhel-= 9.4-func/include/linux/atomic/atomic-arch-fallback.h:2170 kbuild/obj/consum= er/x86_64-rhel-9.4-func/include/linux/atomic/atomic-instrumented.h:1302 kbu= ild/obj/consumer/x86_64-rhel-9.4-func/include/asm-generic/qspinlock.h:111 k= build/obj/consumer/x86_64-rhel-9.4-func/include/linux/spinlock.h:187 kbuild= /obj/consumer/x86_64-rhel-9.4-func/include/linux/spinlock_api_smp.h:127 kbu= ild/obj/consumer/x86_64-rhel-9.4-func/kernel/locking/spinlock.c:178)=20 [ 130.483350][ T2674] ? __pfx_tcp_release_cb (kbuild/obj/consumer/x86_64-rh= el-9.4-func/net/ipv4/tcp_output.c:1151)=20 [ 130.488394][ T2674] siw_tcp_sendpages+0x1f1/0x4f0 siw=20 [ 130.494322][ T2674] ? __pfx_siw_tcp_sendpages+0x10/0x10 siw=20 [ 130.500763][ T2674] siw_tx_hdt (kbuild/obj/consumer/x86_64-rhel-9.4-func/= drivers/infiniband/sw/siw/siw_qp_tx.c:379 kbuild/obj/consumer/x86_64-rhel-9= .4-func/drivers/infiniband/sw/siw/siw_qp_tx.c:586) siw=20 [ 130.505558][ T2674] ? __pfx_sched_balance_find_src_group (kbuild/obj/cons= umer/x86_64-rhel-9.4-func/kernel/sched/fair.c:11298)=20 [ 130.511811][ T2674] ? __pfx_siw_tx_hdt (kbuild/obj/consumer/x86_64-rhel-9= .4-func/drivers/infiniband/sw/siw/siw_qp_tx.c:431) siw=20 [ 130.517045][ T2674] ? sched_balance_rq (kbuild/obj/consumer/x86_64-rhel-9= .4-func/kernel/sched/fair.c:11770)=20 [ 130.521998][ T2674] ? dl_scaled_delta_exec (kbuild/obj/consumer/x86_64-rh= el-9.4-func/kernel/sched/deadline.c:1481)=20 [ 130.527133][ T2674] ? place_entity (kbuild/obj/consumer/x86_64-rhel-9.4-f= unc/kernel/sched/fair.c:5206)=20 [ 130.531567][ T2674] ? __pfx__raw_spin_lock (kbuild/obj/consumer/x86_64-rh= el-9.4-func/kernel/locking/spinlock.c:153)=20 [ 130.536606][ T2674] ? pick_eevdf (kbuild/obj/consumer/x86_64-rhel-9.4-fun= c/kernel/sched/fair.c:946)=20 [ 130.540970][ T2674] ? __resched_curr (kbuild/obj/consumer/x86_64-rhel-9.4= -func/arch/x86/include/asm/bitops.h:60 kbuild/obj/consumer/x86_64-rhel-9.4-= func/include/asm-generic/bitops/instrumented-atomic.h:29 kbuild/obj/consume= r/x86_64-rhel-9.4-func/include/linux/thread_info.h:97 kbuild/obj/consumer/x= 86_64-rhel-9.4-func/kernel/sched/core.c:1113)=20 [ 130.545678][ T2674] ? update_curr (kbuild/obj/consumer/x86_64-rhel-9.4-fu= nc/kernel/sched/fair.c:1236)=20 [ 130.550031][ T2674] ? xas_load (kbuild/obj/consumer/x86_64-rhel-9.4-func/= include/linux/xarray.h:175 kbuild/obj/consumer/x86_64-rhel-9.4-func/include= /linux/xarray.h:1264 kbuild/obj/consumer/x86_64-rhel-9.4-func/lib/xarray.c:= 241)=20 [ 130.554136][ T2674] ? xa_load (kbuild/obj/consumer/x86_64-rhel-9.4-func/l= ib/xarray.c:1613)=20 [ 130.558136][ T2674] ? __pfx_xa_load (kbuild/obj/consumer/x86_64-rhel-9.4-= func/lib/xarray.c:1613)=20 [ 130.562569][ T2674] ? ttwu_do_activate (kbuild/obj/consumer/x86_64-rhel-9= .4-func/kernel/sched/core.c:3705 kbuild/obj/consumer/x86_64-rhel-9.4-func/k= ernel/sched/core.c:3735)=20 [ 130.567431][ T2674] ? update_rq_clock_task (kbuild/obj/consumer/x86_64-rh= el-9.4-func/kernel/sched/sched.h:1325 kbuild/obj/consumer/x86_64-rhel-9.4-f= unc/kernel/sched/pelt.h:120 kbuild/obj/consumer/x86_64-rhel-9.4-func/kernel= /sched/core.c:797)=20 [ 130.572650][ T2674] ? siw_mem_id2obj (kbuild/obj/consumer/x86_64-rhel-9.4= -func/drivers/infiniband/sw/siw/siw_mem.c:52) siw=20 [ 130.577866][ T2674] ? __pfx_siw_try_1seg (kbuild/obj/consumer/x86_64-rhel= -9.4-func/drivers/infiniband/sw/siw/siw_qp_tx.c:50) siw=20 [ 130.583264][ T2674] ? __pfx_try_to_wake_up (kbuild/obj/consumer/x86_64-rh= el-9.4-func/kernel/sched/core.c:4175)=20 [ 130.588310][ T2674] ? finish_task_switch+0x155/0x750=20 [ 130.593957][ T2674] siw_qp_sq_proc_tx (kbuild/obj/consumer/x86_64-rhel-9.= 4-func/drivers/infiniband/sw/siw/siw_qp_tx.c:882) siw=20 [ 130.599352][ T2674] ? siw_activate_tx (kbuild/obj/consumer/x86_64-rhel-9.= 4-func/drivers/infiniband/sw/siw/siw_qp.c:996) siw=20 [ 130.604670][ T2674] siw_qp_sq_process (kbuild/obj/consumer/x86_64-rhel-9.= 4-func/drivers/infiniband/sw/siw/siw_qp_tx.c:1038) siw=20 [ 130.609905][ T2674] siw_sq_resume (kbuild/obj/consumer/x86_64-rhel-9.4-fu= nc/drivers/infiniband/sw/siw/siw_qp_tx.c:1170) siw=20 [ 130.614789][ T2674] siw_run_sq (kbuild/obj/consumer/x86_64-rhel-9.4-func/= drivers/infiniband/sw/siw/siw_qp_tx.c:1258) siw=20 [ 130.619508][ T2674] ? __pfx_siw_run_sq (kbuild/obj/consumer/x86_64-rhel-9= .4-func/drivers/infiniband/sw/siw/siw_qp_tx.c:1236) siw=20 [ 130.624735][ T2674] ? __pfx__raw_spin_lock_irqsave (kbuild/obj/consumer/x= 86_64-rhel-9.4-func/kernel/locking/spinlock.c:161)=20 [ 130.630482][ T2674] ? __pfx_autoremove_wake_function (kbuild/obj/consumer= /x86_64-rhel-9.4-func/kernel/sched/wait.c:383)=20 [ 130.636383][ T2674] ? __kthread_parkme (kbuild/obj/consumer/x86_64-rhel-9= .4-func/arch/x86/include/asm/bitops.h:206 (discriminator 15) kbuild/obj/con= sumer/x86_64-rhel-9.4-func/arch/x86/include/asm/bitops.h:238 (discriminator= 15) kbuild/obj/consumer/x86_64-rhel-9.4-func/include/asm-generic/bitops/in= strumented-non-atomic.h:142 (discriminator 15) kbuild/obj/consumer/x86_64-r= hel-9.4-func/kernel/kthread.c:291 (discriminator 15))=20 [ 130.641160][ T2674] ? __pfx_siw_run_sq (kbuild/obj/consumer/x86_64-rhel-9= .4-func/drivers/infiniband/sw/siw/siw_qp_tx.c:1236) siw=20 [ 130.646377][ T2674] kthread (kbuild/obj/consumer/x86_64-rhel-9.4-func/ker= nel/kthread.c:464)=20 [ 130.650291][ T2674] ? __pfx_kthread (kbuild/obj/consumer/x86_64-rhel-9.4-= func/kernel/kthread.c:413)=20 [ 130.654724][ T2674] ? __pfx__raw_spin_lock_irq (kbuild/obj/consumer/x86_6= 4-rhel-9.4-func/kernel/locking/spinlock.c:169)=20 [ 130.660098][ T2674] ? __pfx_kthread (kbuild/obj/consumer/x86_64-rhel-9.4-= func/kernel/kthread.c:413)=20 [ 130.664534][ T2674] ret_from_fork (kbuild/obj/consumer/x86_64-rhel-9.4-fu= nc/arch/x86/kernel/process.c:159)=20 [ 130.668809][ T2674] ? __pfx_kthread (kbuild/obj/consumer/x86_64-rhel-9.4-= func/kernel/kthread.c:413)=20 [ 130.673247][ T2674] ret_from_fork_asm (kbuild/obj/consumer/x86_64-rhel-9.= 4-func/arch/x86/entry/entry_64.S:258)=20 [ 130.677869][ T2674] [ 130.680755][ T2674] ---[ end trace 0000000000000000 ]--- The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250522/202505221248.595a9117-lkp@= intel.com --=20 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki