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AJvYcCUrhKPKB34zgPsTILnVY0QtUYQM8R3ksvlz0xLLtdeloCrMJkd2rZ6QbKNGRjoMYvNeRASnIclbVw==@kvack.org X-Gm-Message-State: AOJu0YzHT4KNGAx0q3LPNGVNDWMffrqZIJnE3qBL3VxP8yIppJY/5+Sk Ht49IjyjJyiytVuOZ1YnXaQh9Z2IO2WOxPrTP7WbkArf0/kWNVY8XX2t/1UeQuXj7W02G9E/QKj B/32fw+5mr2Oo5Y2BoPgrgfSCyk+fxvYYac3RZLk/ X-Gm-Gg: AZuq6aKvG2Ht+uhEqCxQjXGQG+7HsMmhilTapfkO2r0Jw/vPGr1V29RmfcUXcJICnqI v+2KAjXKqrL1lC4FIr7cDommjiR+k21iPCIiCGf+Q1NrYjzeP2XA2MLCaIL1Xe5IGtXn4nUsO5q eXTlEz/VRIsTHoyCMyUq8i+x6TxMzS5YH+VaHki0rKWzP+qdd1uy3beQOJ1AJBzadR4ehVq9dkx JcVRVEUPvyxbpD5J7etVkvhrtyJBjWjvzAXBEfB6v3WSbu4Ghsnfe94k6ljQXkjowzbDUL1rlUn nc9F0w== X-Received: by 2002:a05:622a:11d6:b0:4f3:5475:6b10 with SMTP id d75a77b69052e-5072c9f4d39mr323241cf.8.1771871695469; Mon, 23 Feb 2026 10:34:55 -0800 (PST) MIME-Version: 1.0 References: <20260223155128.3849-1-00107082@163.com> <6ca5f70c-43c5-4ba3-bdc4-8c48607dbe7c@suse.com> In-Reply-To: <6ca5f70c-43c5-4ba3-bdc4-8c48607dbe7c@suse.com> From: Suren Baghdasaryan Date: Mon, 23 Feb 2026 10:34:42 -0800 X-Gm-Features: AaiRm53fmpm6v_smjKE7BKMzhbuUvY6HlBQw3FyGS4ECJIIm7SZMCx69mqPbH00 Message-ID: Subject: Re: [7.0-rc1] codetag: kernel warning "alloc_tag was not set" during boot To: Vlastimil Babka Cc: David Wang <00107082@163.com>, vbabka@suse.cz, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Harry Yoo Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: E4A8E20005 X-Stat-Signature: jjiub9pn6z45w78w7sybojkn9ctikek1 X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1771871696-253790 X-HE-Meta: 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 cMt2y8xR k+miAe2LerzxaMJIAGkBeAV4cf1mJXenX9HcAn87OswbkSFKpzwkg9w49JpuX6any3zWGWfISLwcZ9fbYFQVKVIKJrzS2cjGidUAagFqayb4FVFDzspsL95l0pNDcGqdblX7e4He+MHHVQ4yKVRlAHm7wX1/aPTQsz11pbx9gdE4W2q099e6m+o6sakbHypwQfMJChUE68XbrQs0LrcWax80JlEWujtLRoWoZQl8FkUrIW4sTZY3IGiSYjAD4ek65KefFhlfs/WOkBPWfS9MHHQCnF1uyTzGbwQ8CBFQ+KQOGtXeyOTPKPFHbcidKnfbq9v+pSLrVv41nKQsAdx0LC4OCBcu/mDqRheyhqggHiyz4+f0v3f6O5AMJr/RV+atB7KfHR3bkrS0q2iDKj22or+8r1OIKowQG5VMn8Y4VfrbxjfJ2lWaRpx7pFPEV+rofmPy5 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: On Mon, Feb 23, 2026 at 9:18=E2=80=AFAM Vlastimil Babka w= rote: > > On 2/23/26 16:51, David Wang wrote: > > Hi, > > > > When upgrade to 7.0.0-rc1, caught a kernel WARN during boot: > > Would this possibly help? (it probably shouldn't but let's see) > https://lore.kernel.org/all/20260223075809.19265-1-harry.yoo@oracle.com/ Hi David, Could you please send us your kernel config? I just tried v7.0-rc1 (Linus` ToT) with CONFIG_MEM_ALLOC_PROFILING_DEBUG enabled and did not see any warnings. Something must be different on your end. Thanks, Suren. > > > ------------[ cut here ]------------ > > alloc_tag was not set > > WARNING: ./include/linux/alloc_tag.h:166 at __alloc_tagging_slab= _free_hook+0xe6/0x120, CPU#4: (udev-worker)/145 > > Modules linked in: xhci_pci(E+) ahci(E) libahci(E) xhci_hcd(E) n= vme(E) sp5100_tco(E) libata(E) r8169(E) realtek(E) usbcore(E) nvme_core(E) = scsi_mod(E) scsi_common(E) usb_common(E) i2c_piix4(E) i2c_smbus(E) wmi(E) f= jes(E-) gpio_amdpt(E) gpio_generic(E) button(E) efivarfs(E) > > CPU: 4 UID: 0 PID: 145 Comm: (udev-worker) Tainted: G = E 7.0.0-rc1-linan-0 #802 PREEMPT(full) > > Tainted: [E]=3DUNSIGNED_MODULE > > Hardware name: Micro-Star International Co., Ltd. MS-7B89/B450M = MORTAR MAX (MS-7B89), BIOS 2.L0 07/18/2024 > > RIP: 0010:__alloc_tagging_slab_free_hook+0xe6/0x120 > > Code: 2c d3 e8 0f af c2 4c 01 f0 48 89 c3 74 9e 48 8b 00 41 8b 5= 4 24 18 48 85 c0 0f 85 6c ff ff ff 89 54 24 04 48 8d 3d da 4e 44 01 <67> 48= 0f b9 3a 48 8b 03 8b 54 24 04 48 85 c0 0f 85 4c ff ff ff 48 > > RSP: 0018:ffffd28e40278e80 EFLAGS: 00010246 > > RAX: 0000000000000000 RBX: ffff8c36422d82c0 RCX: 000000000000000= 8 > > RDX: 0000000000000200 RSI: fffff352840bb800 RDI: ffffffffadc4aee= 0 > > RBP: ffffd28e40278ec8 R08: 0000000000000014 R09: ffffffffac80e09= c > > R10: ffff8c3640042200 R11: ffff8c364dca2480 R12: ffff8c3640042a0= 0 > > R13: fffff352840bb800 R14: ffff8c36422d8200 R15: ffffd28e40278ed= 0 > > FS: 00007fa2ca8be980(0000) GS:ffff8c39c0c1a000(0000) knlGS:0000= 000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007fa2c9b727a5 CR3: 00000001158cc000 CR4: 0000000000350ef= 0 > > Call Trace: > > > > ? rcu_core+0x451/0x750 > > kfree+0xab/0x370 > > rcu_core+0x451/0x750 > > ? rcu_core+0x3eb/0x750 > > ? srso_return_thunk+0x5/0x5f > > handle_softirqs+0x100/0x2e0 > > __irq_exit_rcu+0xb1/0x100 > > sysvec_apic_timer_interrupt+0x9d/0xc0 > > > > > > asm_sysvec_apic_timer_interrupt+0x16/0x20 > > RIP: 0010:xhci_handshake+0x56/0xc0 [xhci_hcd] > > Code: fa 8b 07 89 f1 49 89 fe 41 89 f5 21 c1 41 39 cc 75 22 eb 3= c f3 90 48 81 eb e9 03 00 00 48 89 da 48 c1 ea 3f 44 21 fa 41 8b 06 <44> 89= e9 21 c1 44 39 e1 74 1c 83 f8 ff 74 2d 84 d2 75 3d bf c7 10 > > RSP: 0018:ffffd28e4045f9d0 EFLAGS: 00000246 > > RAX: 0000000000000002 RBX: 000000025354e082 RCX: 000000000000000= 4 > > RDX: 0000000000000000 RSI: 0000000000000df4 RDI: 00000014243ef47= 0 > > RBP: 0000000000989680 R08: ffffffffc0741fbe R09: 00000000fffffff= f > > R10: 0000000000000004 R11: 0000000000000001 R12: 000000000000000= 0 > > R13: 0000000000000002 R14: ffffd28e40cc8020 R15: ffff8c3655ac180= 1 > > ? __pfx_xhci_pci_quirks+0x10/0x10 [xhci_pci] > > xhci_reset+0x6a/0x110 [xhci_hcd] > > xhci_gen_setup+0x201/0x450 [xhci_hcd] > > xhci_pci_setup+0x50/0x1c0 [xhci_pci] > > usb_add_hcd.cold+0x265/0x5d5 [usbcore] > > usb_hcd_pci_probe+0x16f/0x420 [usbcore] > > xhci_pci_common_probe+0x39/0x2c0 [xhci_pci] > > ? srso_return_thunk+0x5/0x5f > > local_pci_probe+0x41/0x90 > > pci_device_probe+0xd0/0x250 > > ? srso_return_thunk+0x5/0x5f > > ? sysfs_do_create_link_sd+0x6e/0xe0 > > really_probe+0xde/0x380 > > ? pm_runtime_barrier+0x56/0x90 > > __driver_probe_device+0x78/0x120 > > driver_probe_device+0x1f/0xa0 > > __driver_attach+0xf6/0x230 > > ? __pfx___driver_attach+0x10/0x10 > > bus_for_each_dev+0x79/0xd0 > > bus_add_driver+0xeb/0x270 > > driver_register+0x6e/0xc0 > > ? __pfx_xhci_pci_init+0x10/0x10 [xhci_pci] > > do_one_initcall+0x43/0x310 > > ? srso_return_thunk+0x5/0x5f > > ? __kmalloc_cache_noprof+0x143/0x3f0 > > ? do_init_module+0x3f/0x280 > > do_init_module+0x91/0x280 > > init_module_from_file+0xc8/0xe0 > > idempotent_init_module+0xfe/0x2f0 > > __x64_sys_finit_module+0x6d/0xe0 > > do_syscall_64+0xf4/0xf20 > > entry_SYSCALL_64_after_hwframe+0x76/0x7e > > RIP: 0033:0x7fa2cb41a779 > > Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f= 8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d= 01 f0 ff ff 73 01 c3 48 8b 0d 4f 86 0d 00 f7 d8 64 89 01 48 > > RSP: 002b:00007ffe556d6b18 EFLAGS: 00000246 ORIG_RAX: 0000000000= 000139 > > RAX: ffffffffffffffda RBX: 000055b03b330950 RCX: 00007fa2cb41a77= 9 > > RDX: 0000000000000000 RSI: 00007fa2c9b9e44d RDI: 000000000000001= f > > RBP: 0000000000000000 R08: 0000000000000000 R09: 000055b03b2fed3= 0 > > R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa2c9b9e44= d > > R13: 0000000000020000 R14: 000055b03b3242e0 R15: 000000000000000= 0 > > > > ---[ end trace 0000000000000000 ]--- > > > > The second time I boot my system, I got the same warning but different = call stacks: > > ------------[ cut here ]------------ > > alloc_tag was not set > > WARNING: ./include/linux/alloc_tag.h:166 at __alloc_tagging_slab= _free_hook+0xe6/0x120, CPU#0: ksoftirqd/0/14 > > Modules linked in: xhci_pci(E+) ahci(E+) r8169(E+) nvme(E) libah= ci(E) xhci_hcd(E) realtek(E) libata(E) i2c_piix4(E) nvme_core(E) i2c_smbus(= E) usbcore(E) scsi_mod(E) usb_common(E) scsi_common(E) wmi(E) fjes(E-) gpio= _amdpt(E) gpio_generic(E) button(E) efivarfs(E) > > CPU: 0 UID: 0 PID: 14 Comm: ksoftirqd/0 Tainted: G E = 7.0.0-rc1-linan-0 #802 PREEMPT(full) > > Tainted: [E]=3DUNSIGNED_MODULE > > Hardware name: Micro-Star International Co., Ltd. MS-7B89/B450M = MORTAR MAX (MS-7B89), BIOS 2.L0 07/18/2024 > > RIP: 0010:__alloc_tagging_slab_free_hook+0xe6/0x120 > > Code: 2c d3 e8 0f af c2 4c 01 f0 48 89 c3 74 9e 48 8b 00 41 8b 5= 4 24 18 48 85 c0 0f 85 6c ff ff ff 89 54 24 04 48 8d 3d da 4e 44 01 <67> 48= 0f b9 3a 48 8b 03 8b 54 24 04 48 85 c0 0f 85 4c ff ff ff 48 > > RSP: 0018:ffffd362c0137d48 EFLAGS: 00010246 > > RAX: 0000000000000000 RBX: ffff8b718006c610 RCX: 000000000000000= 8 > > RDX: 0000000000000200 RSI: fffffa5884001900 RDI: ffffffffa184aee= 0 > > RBP: ffffd362c0137d90 R08: 0000000000000001 R09: ffffffffa040e09= c > > R10: ffff8b7180042700 R11: ffff8b7183b47440 R12: ffff8b7180042a0= 0 > > R13: fffffa5884001900 R14: ffff8b718006c600 R15: ffffd362c0137d9= 8 > > FS: 0000000000000000(0000) GS:ffff8b750ce1a000(0000) knlGS:0000= 000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 0000560882dbc058 CR3: 0000000107e6f000 CR4: 0000000000350ef= 0 > > Call Trace: > > > > ? rcu_core+0x451/0x750 > > kfree+0xab/0x370 > > rcu_core+0x451/0x750 > > ? rcu_core+0x3eb/0x750 > > ? srso_return_thunk+0x5/0x5f > > ? try_to_wake_up+0xaf/0x740 > > handle_softirqs+0x100/0x2e0 > > run_ksoftirqd+0x37/0x50 > > smpboot_thread_fn+0x114/0x2a0 > > ? __pfx_smpboot_thread_fn+0x10/0x10 > > kthread+0x114/0x150 > > ? __pfx_kthread+0x10/0x10 > > ret_from_fork+0x238/0x330 > > ? __pfx_kthread+0x10/0x10 > > ret_from_fork_asm+0x1a/0x30 > > > > ---[ end trace 0000000000000000 ]--- > > > > Bisect narrows it down to 913ffd3a1b(slab: handle kmalloc sheaves boots= trap) > > > > $ git bisect log > > git bisect start > > # status: waiting for both good and bad commits > > # good: [05f7e89ab9731565d8a62e3b5d1ec206485eeb0b] Linux 6.19 > > git bisect good 05f7e89ab9731565d8a62e3b5d1ec206485eeb0b > > # status: waiting for bad commit, 1 good commit known > > # bad: [6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f] Linux 7.0-rc1 > > git bisect bad 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f > > # bad: [6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f] Linux 7.0-rc1 > > git bisect bad 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f > > # good: [939faf71cf7ca9ab3d1bd2912ac0e203d4d7156a] Merge tag 'drm= -next-2026-02-11' of https://gitlab.freedesktop.org/drm/kernel > > git bisect good 939faf71cf7ca9ab3d1bd2912ac0e203d4d7156a > > # bad: [c87c79345ea8ff917354e9223d44034e4aef2690] Merge tag 'uml-= for-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux > > git bisect bad c87c79345ea8ff917354e9223d44034e4aef2690 > > # good: [83310d613382f74070fc8b402f3f6c2af8439ead] Merge git://gi= t.kernel.org/pub/scm/linux/kernel/git/netdev/net > > git bisect good 83310d613382f74070fc8b402f3f6c2af8439ead > > # bad: [541c43310e85dbf35368b43b720c6724bc8ad8ec] Merge tag 'fs_f= or_v6.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-f= s > > git bisect bad 541c43310e85dbf35368b43b720c6724bc8ad8ec > > # bad: [1c2b4a4c2bcb950f182eeeb33d94b565607608cf] Merge tag 'pci-= v7.0-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci > > git bisect bad 1c2b4a4c2bcb950f182eeeb33d94b565607608cf > > # bad: [61e629596fabd7f60cc3748a603703c5d9b58428] Merge tag 'for-= 7.0/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-map= per/linux-dm > > git bisect bad 61e629596fabd7f60cc3748a603703c5d9b58428 > > # bad: [148f95f75c513936d466bcc7e6bf73298da2212b] Merge tag 'slab= -for-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab > > git bisect bad 148f95f75c513936d466bcc7e6bf73298da2212b > > # good: [41f1a08645abb5ef7d2a3ed8835c747334878774] Merge tag 'kbu= ild-7.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux > > git bisect good 41f1a08645abb5ef7d2a3ed8835c747334878774 > > # bad: [6c2f307f30edbe2b18a35584f01854a27e375927] slab: remove un= used PREEMPT_RT specific macros > > git bisect bad 6c2f307f30edbe2b18a35584f01854a27e375927 > > # good: [f3421f8d154cc0906da145299c72f4a7f046ffde] slab: introduc= e percpu sheaves bootstrap > > git bisect good f3421f8d154cc0906da145299c72f4a7f046ffde > > # bad: [e323b52cf00ffc3f5ac79420af7ab340b4576a5c] slab: remove SL= UB_CPU_PARTIAL > > git bisect bad e323b52cf00ffc3f5ac79420af7ab340b4576a5c > > # bad: [913ffd3a1bf5d154995c6cfab44994b07b3c103f] slab: handle km= alloc sheaves bootstrap > > git bisect bad 913ffd3a1bf5d154995c6cfab44994b07b3c103f > > # good: [f1427a1d64156bb88d84f364855c364af6f67a3b] slab: make per= cpu sheaves compatible with kmalloc_nolock()/kfree_nolock() > > git bisect good f1427a1d64156bb88d84f364855c364af6f67a3b > > # first bad commit: [913ffd3a1bf5d154995c6cfab44994b07b3c103f] sl= ab: handle kmalloc sheaves bootstrap > > > > > > > > FYI > > David > > >