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[70.29.229.84]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-31c3008f259sm2054568a91.29.2025.07.09.05.51.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 09 Jul 2025 05:51:36 -0700 (PDT) Message-ID: <97d9d605-8216-4e31-b31b-113764781b13@redhat.com> Date: Wed, 9 Jul 2025 08:51:34 -0400 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: BUG: KASAN: stack-out-of-bounds in snapshot_page during gup_test test case To: Harry Yoo Cc: david@redhat.com, willy@infradead.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, shivankg@amd.com, sj@kernel.org References: Content-Language: en-US, en-CA From: Luiz Capitulino In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2025-07-09 04:14, Harry Yoo wrote: > On Mon, Jul 07, 2025 at 02:50:42PM -0400, Luiz Capitulino wrote: >> Hi, >> >> The series introduction will follow the changelog. This is against v6.16-rc5. >> >> Changelog >> ========= >> >> v1 -> v2 >> - Include is_huge_zero_pfn() patch and use it (David) >> - Move free page detection to snapshot_page() (David) >> - Changelog improvements (Shivank) >> - Added Acked-bys >> >> RFC -> v1 >> - Include to avoid build error on sh arch >> >> Introduction >> ============ >> >> This series introduces snapshot_page(), a helper function that can be used >> to create a snapshot of a struct page and its associated struct folio. >> >> This function is intended to help callers with a consistent view of a >> a folio while reducing the chance of encountering partially updated or >> inconsistent state, such as during folio splitting which could lead to >> crashes and BUG_ON()s being triggered. > > Hi, my mm-new test environment started hitting a kernel crash with > snapshot_page() involved. As it's pretty new function, reporting > the bug directly here. Thanks for the detailed report Harry, I'll look into this shortly. > > I have three independent reports, and all of them fails at: > `./gup_test -ct -F 0x1 0 19 0x1000` > while dumping the page in tools/testing/selftests/mm/gup_test.c > test case. > > Attaching the configs as attachment. > > If you need further help to reproduce this, please let me know. > > # Report 1 > > # ----------------------------------------- > # running ./gup_test -ct -F 0x1 0 19 0x1000 > # ----------------------------------------- > # TAP version 13 > # 1..1 > ================================================================== > BUG: KASAN: stack-out-of-bounds in snapshot_page+0x282/0x5d0 > Read of size 256 at addr ffff88810c52fc50 by task gup_test/2236 > > CPU: 3 UID: 0 PID: 2236 Comm: gup_test Not tainted 6.16.0-rc5 #22 PREEMPT(voluntary) > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > Call Trace: > > dump_stack_lvl+0x66/0xa0 > print_report+0xd0/0x640 > ? snapshot_page+0x282/0x5d0 > ? srso_return_thunk+0x5/0x5f > ? __virt_addr_valid+0x208/0x3f0 > ? snapshot_page+0x282/0x5d0 > kasan_report+0xe4/0x120 > ? snapshot_page+0x282/0x5d0 > kasan_check_range+0x105/0x1b0 > __asan_memcpy+0x23/0x60 > snapshot_page+0x282/0x5d0 > ? desc_read_finalized_seq+0x75/0x130 > ? __pfx_snapshot_page+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? srso_return_thunk+0x5/0x5f > ? _raw_spin_unlock_irqrestore+0x22/0x50 > ? prb_read_valid+0x64/0x90 > __dump_page+0x9b/0x590 > ? __pfx___dump_page+0x10/0x10 > ? __pfx__printk+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? mark_held_locks+0x40/0x70 > ? dump_page+0x34/0x80 > dump_page+0x34/0x80 > gup_test_ioctl+0x100d/0x1790 > ? __pfx_gup_test_ioctl+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? __pfx_ioctl_has_perm.constprop.0.isra.0+0x10/0x10 > ? __fget_files+0x1a7/0x2f0 > ? srso_return_thunk+0x5/0x5f > ? lock_release+0xc5/0x290 > __x64_sys_ioctl+0x134/0x1c0 > do_syscall_64+0xbb/0x360 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f8704b24ded > Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00 > RSP: 002b:00007f86fc9fedd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007f86fc9ffcdc RCX: 00007f8704b24ded > RDX: 00007f86fc9fee30 RSI: 00000000c0506706 RDI: 0000000000000004 > RBP: 00007f86fc9fee20 R08: 0000000000000000 R09: 00007f86fc9ff6c0 > R10: 00007f8704a18808 R11: 0000000000000246 R12: 00007f86fc9ff6c0 > R13: ffffffff3faf98ff R14: 0000000000000000 R15: 00007fff93bc7f10 > > > The buggy address belongs to stack of task gup_test/2236 > and is located at offset 288 in frame: > __dump_page+0x0/0x590 > > This frame has 1 object: > [32, 384) 'ps' > > The buggy address belongs to the physical page: > > Memory state around the buggy address: > ffff88810c52fb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88810c52fc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >> ffff88810c52fc80: 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 f3 00 00 > ^ > ffff88810c52fd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88810c52fd80: 00 00 00 f1 f1 f1 f1 f1 f1 00 f2 f2 f2 00 00 00 > ================================================================== > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043139c1 > Oops: general protection fault, probably for non-canonical address 0xe3fffa2204313c50: 0000 [#1] SMP KASAN NOPTI > KASAN: maybe wild-memory-access in range [0x1ffff1102189e280-0x1ffff1102189e287] > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043139b7 > CPU: 0 UID: 102 PID: 444 Comm: in:imklog Tainted: G B 6.16.0-rc5 #22 PREEMPT(voluntary) > Tainted: [B]=BAD_PAGE > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > RIP: 0010:get_mem_cgroup_from_mm+0xe0/0x600 > Code: 03 80 3c 28 00 0f 85 4a 04 00 00 4c 8b bb d0 12 00 00 e8 d3 1b dc 02 85 c0 0f 85 c6 00 00 00 49 8d 7f 20 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 2b 04 00 00 49 8b 5f 20 48 85 db 0f 84 98 00 00 > RSP: 0000:ffff88810b957bc8 EFLAGS: 00010216 > RAX: 03fffe2204313c50 RBX: ffff88810c4f0000 RCX: ffffffff91cb0e6a > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 1ffff1102189e282 > RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: ffffea00042588c7 R11: ffff88810b957e20 R12: ffff88810edc2700 > R13: ffffed1021db85e9 R14: ffffffff91cb0eb0 R15: 1ffff1102189e262 > FS: 00007fe8d345b6c0(0000) GS:ffff888183970000(0000) knlGS:0000000000000000 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043139ac > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fe8d3860000 CR3: 000000010426b000 CR4: 0000000000350ef0 > Call Trace: > > __mem_cgroup_charge+0x1a/0x1e0 > folio_prealloc+0x109/0x220 > do_anonymous_page+0x853/0x1f00 > ? srso_return_thunk+0x5/0x5f > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043139a2 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313997 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431398d > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313982 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313978 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431396d > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313963 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313958 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431394e > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313943 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313939 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431392e > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313924 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313919 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431390f > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313904 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043138fa > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043138ef > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043138e5 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043138da > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043138d0 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043138c5 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043138bb 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mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043136d8 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043136cd > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043136c3 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043136b8 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043136ae > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043136a3 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313699 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431368e > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313684 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313679 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431366f > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313664 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431365a > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431364f > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313645 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431363a > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313630 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313625 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431361b > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313610 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313606 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043135fb > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043135f1 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043135e6 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043135dc > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043135d1 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043135c7 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043135bc > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043135b2 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043135a7 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431359d > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313592 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313588 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431357d > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313573 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313568 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431355e > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313553 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313549 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431353e > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313534 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313529 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431351f > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a04313514 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0431350a > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043134ff > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043134f5 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a043134ea > traps: PANIC: double fault, error_code: 0x0 > ? srso_return_thunk+0x5/0x5f > ? lock_release+0x1c0/0x290 > __handle_mm_fault+0xfb7/0x1310 > ? __pfx___handle_mm_fault+0x10/0x10 > ? lock_release+0x1c0/0x290 > handle_mm_fault+0x2a2/0x670 > ? __x64_sys_gettimeofday+0x118/0x1a0 > do_user_addr_fault+0x242/0xb10 > exc_page_fault+0x5c/0xc0 > asm_exc_page_fault+0x26/0x30 > RIP: 0033:0x564750127362 > Code: ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 f9 ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b 97 38 02 00 00 48 8b 87 40 02 00 00 <48> 89 34 d0 48 8b 87 38 02 00 00 48 63 57 24 48 83 c0 01 48 39 d0 > RSP: 002b:00007fe8d343a1f8 EFLAGS: 00010246 > RAX: 00007fe8d385d010 RBX: 0000000000000001 RCX: 0000000000000000 > RDX: 00000000000005fe RSI: 00007fe8c4016f10 RDI: 000056476d61fc70 > RBP: 00007fe8d343a270 R08: 0000000000000056 R09: 0000000000000000 > R10: a3d70a3d70a3d70b R11: 0000000000000000 R12: 000056475018a560 > R13: 00007fe8d343a220 R14: 0000000000000004 R15: 000056476d61fc70 > > Modules linked in: > Oops: double fault: 0000 [#2] SMP KASAN NOPTI > CPU: 3 UID: 0 PID: 2236 Comm: gup_test Tainted: G B D 6.16.0-rc5 #22 PREEMPT(voluntary) > Tainted: [B]=BAD_PAGE, [D]=DIE > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > RIP: 0010:default_pointer+0x2b/0x490 > Code: 57 41 56 49 89 f6 48 89 ce 48 b9 00 00 00 00 00 fc ff df 41 55 41 54 55 53 48 89 fb 48 83 ec 78 4c 8d 64 24 18 48 8d 7c 24 3c <48> c7 44 24 18 b3 8a b5 41 48 c7 44 24 20 32 42 85 95 49 c1 ec 03 > RSP: 0018:ffff88810c4d2fd8 EFLAGS: 00010096 > RAX: 0000000000000020 RBX: ffff88810c4d337e RCX: dffffc0000000000 > RDX: 0000000000000000 RSI: ffffffffffff0a00 RDI: ffff88810c4d3014 > RBP: ffffffff94cff76a R08: ffffffffffff0a00 R09: 00000000fffffffc > R10: 0000000000000004 R11: 00000000ffffffff R12: ffff88810c4d2ff0 > R13: ffff88810c4d3360 R14: ffff88810c4d3360 R15: 000000000000ffff > ---[ end trace 0000000000000000 ]--- > FS: 00007f86fc9ff6c0(0000) GS:ffff888183af0000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffff88810c4d2fc8 CR3: 000000010135a000 CR4: 0000000000350ef0 > Call Trace: > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:get_mem_cgroup_from_mm+0xe0/0x600 > Oops: general protection fault, probably for non-canonical address 0xe3fffa2204313c50: 0000 [#3] SMP KASAN NOPTI > Code: 03 80 3c 28 00 0f 85 4a 04 00 00 4c 8b bb d0 12 00 00 e8 d3 1b dc 02 85 c0 0f 85 c6 00 00 00 49 8d 7f 20 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 2b 04 00 00 49 8b 5f 20 48 85 db 0f 84 98 00 00 > RSP: 0000:ffff88810b957bc8 EFLAGS: 00010216 > RAX: 03fffe2204313c50 RBX: ffff88810c4f0000 RCX: ffffffff91cb0e6a > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 1ffff1102189e282 > RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: ffffea00042588c7 R11: ffff88810b957e20 R12: ffff88810edc2700 > R13: ffffed1021db85e9 R14: ffffffff91cb0eb0 R15: 1ffff1102189e262 > FS: 00007f86fc9ff6c0(0000) GS:ffff888183af0000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffff88810c4d2fc8 CR3: 000000010135a000 CR4: 0000000000350ef0 > Kernel panic - not syncing: Fatal exception in interrupt > Shutting down cpus with NMI > Kernel Offset: 0x10200000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) > ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]--- > > # Report 2 > > # ----------------------------------------- > # running ./gup_test -ct -F 0x1 0 19 0x1000 > # ----------------------------------------- > # TAP version 13 > # 1..1 > ================================================================== > BUG: KASAN: stack-out-of-bounds in snapshot_page+0x27e/0x5b0 > Read of size 256 at addr ffff888100f67c50 by task gup_test/2268 > > CPU: 0 UID: 0 PID: 2268 Comm: gup_test Not tainted 6.16.0-rc5 #24 PREEMPT(voluntary) > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > Call Trace: > > dump_stack_lvl+0x66/0xa0 > print_report+0xd0/0x640 > ? snapshot_page+0x27e/0x5b0 > ? srso_return_thunk+0x5/0x5f > ? __virt_addr_valid+0x208/0x3f0 > ? snapshot_page+0x27e/0x5b0 > kasan_report+0xe4/0x120 > ? snapshot_page+0x27e/0x5b0 > kasan_check_range+0x105/0x1b0 > __asan_memcpy+0x23/0x60 > snapshot_page+0x27e/0x5b0 > ? desc_read_finalized_seq+0x75/0x130 > ? __asan_memcpy+0x3c/0x60 > ? __pfx_snapshot_page+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? srso_return_thunk+0x5/0x5f > ? _raw_spin_unlock_irqrestore+0x22/0x50 > ? prb_read_valid+0x64/0x90 > __dump_page+0x9b/0x590 > ? __pfx___dump_page+0x10/0x10 > ? __pfx__printk+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? mark_held_locks+0x40/0x70 > ? dump_page+0x34/0x80 > dump_page+0x34/0x80 > gup_test_ioctl+0x100d/0x1780 > ? __pfx_gup_test_ioctl+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? __pfx_ioctl_has_perm.constprop.0.isra.0+0x10/0x10 > ? __fget_files+0x1a7/0x2f0 > ? srso_return_thunk+0x5/0x5f > ? lock_release+0xc5/0x290 > __x64_sys_ioctl+0x134/0x1c0 > do_syscall_64+0xbb/0x360 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f8eb9f24ded > Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00 > RSP: 002b:00007f8eb1dfedd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007f8eb1dffcdc RCX: 00007f8eb9f24ded > RDX: 00007f8eb1dfee30 RSI: 00000000c0506706 RDI: 0000000000000004 > RBP: 00007f8eb1dfee20 R08: 0000000000000000 R09: 00007f8eb1dff6c0 > R10: 00007f8eb9e18808 R11: 0000000000000246 R12: 00007f8eb1dff6c0 > R13: ffffffff3faf98ff R14: 0000000000000000 R15: 00007ffc0a5f6560 > > > The buggy address belongs to stack of task gup_test/2268 > and is located at offset 288 in frame: > __dump_page+0x0/0x590 > > This frame has 1 object: > [32, 384) 'ps' > > The buggy address belongs to the physical page: > > Memory state around the buggy address: > ffff888100f67b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff888100f67c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >> ffff888100f67c80: 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 f3 00 00 > ^ > ffff888100f67d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff888100f67d80: 00 00 00 f1 f1 f1 f1 f1 f1 00 f2 f2 f2 00 00 00 > ================================================================== > BUG: unable to handle page fault for address: ffffde2055761988 > #PF: supervisor read access in kernel mode > #PF: error_code(0x0000) - not-present page > PGD 10002a067 P4D 10002a067 PUD 0 > page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x0 pfn:0xfffffe7a0403b3e7 > Oops: Oops: 0000 [#1] SMP KASAN NOPTI > CPU: 3 UID: 102 PID: 449 Comm: in:imklog Tainted: G B 6.16.0-rc5 #24 PREEMPT(voluntary) > Tainted: [B]=BAD_PAGE > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > RIP: 0010:__cgroup_account_cputime_field+0x6a/0x130 > Code: 00 00 00 48 03 9d f0 03 00 00 83 fe 01 74 2a 76 4b 83 ee 02 83 fe 02 77 62 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 97 00 00 00 4c 01 23 eb 42 48 b8 00 00 00 00 00 > RSP: 0018:ffff88811af88d30 EFLAGS: 00010016 > RAX: dffffc0000000000 RBX: ffff1102abb0cc40 RCX: 0000000000010000 > RDX: 1fffe22055761988 RSI: 0000000000000000 RDI: ffff888100ef53f0 > RBP: ffff888100ef5000 R08: 0000000000000000 R09: 0000000000000000 > R10: ffffffffae4aa457 R11: ffff88811afa96e8 R12: 00000000000f4240 > R13: 0000000000000002 R14: ffff888107a21578 R15: 00000000fffe958d > FS: 00007f18074466c0(0000) GS:ffff88816bb13000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffde2055761988 CR3: 000000010b9ec000 CR4: 0000000000350ef0 > Call Trace: > > account_system_index_time+0x1ac/0x2d0 > update_process_times+0x71/0x1e0 > ? __pfx_update_process_times+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? srso_return_thunk+0x5/0x5f > ? ktime_get+0xa0/0x1e0 > tick_nohz_handler+0x19e/0x440 > ? __pfx_tick_nohz_handler+0x10/0x10 > __hrtimer_run_queues+0x505/0x8c0 > ? __pfx___hrtimer_run_queues+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? ktime_get_update_offsets_now+0xbe/0x360 > hrtimer_interrupt+0x30a/0x860 > ? srso_return_thunk+0x5/0x5f > ? __flush_smp_call_function_queue+0x35b/0x600 > __sysvec_apic_timer_interrupt+0xbc/0x330 > sysvec_apic_timer_interrupt+0x66/0x80 > > > asm_sysvec_apic_timer_interrupt+0x1a/0x20 > RIP: 0010:kasan_check_range+0x15/0x1b0 > Code: 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 85 f6 0f 84 5b 01 00 00 48 89 f8 41 54 41 89 d0 <48> 01 f0 55 53 0f 82 dc 00 00 00 eb 0f cc cc cc 48 b8 00 00 00 00 > RSP: 0018:ffff888109427760 EFLAGS: 00000202 > RAX: ffff888109427900 RBX: ffffffffadbe0fd8 RCX: ffffffffa96fb3ba > RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888109427900 > RBP: ffff888109427900 R08: 0000000000000001 R09: fffffbfff5b7c1fb > R10: ffffffffadbe0fdf R11: fffffffffffd9500 R12: 00000000ffffe4ad > R13: 0000000000000000 R14: ffff8881094277d8 R15: 0000000000000002 > ? desc_read+0x21a/0x2f0 > desc_read+0x21a/0x2f0 > desc_read_finalized_seq+0x75/0x130 > ? __pfx_desc_read_finalized_seq+0x10/0x10 > ? lock_release+0x1c0/0x290 > ? srso_return_thunk+0x5/0x5f > ? __mutex_trylock_common+0xdd/0x250 > _prb_read_valid+0x1ac/0x680 > ? trace_contention_end+0xc4/0x100 > ? __pfx__prb_read_valid+0x10/0x10 > ? lock_release+0x1c0/0x290 > ? syslog_print+0x34c/0x550 > ? record_print_text+0x2e9/0x3a0 > ? srso_return_thunk+0x5/0x5f > ? lock_acquire+0x286/0x2e0 > prb_read_valid+0x64/0x90 > ? __pfx_prb_read_valid+0x10/0x10 > syslog_print+0x37d/0x550 > ? lock_acquire+0x286/0x2e0 > ? __pfx_syslog_print+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? lock_release+0x1c0/0x290 > ? srso_return_thunk+0x5/0x5f > ? __pfx_autoremove_wake_function+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? srso_return_thunk+0x5/0x5f > ? lock_release+0x1c0/0x290 > ? srso_return_thunk+0x5/0x5f > ? lock_acquire+0x286/0x2e0 > do_syslog+0x12b/0x4b0 > ? __pfx_do_syslog+0x10/0x10 > ? __mutex_trylock_common+0xdd/0x250 > ? __pfx___mutex_trylock_common+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? srso_return_thunk+0x5/0x5f > ? srso_return_thunk+0x5/0x5f > ? selinux_file_permission+0x3a7/0x520 > kmsg_read+0x63/0x80 > vfs_read+0x16e/0xa40 > ? fdget_pos+0x228/0x2e0 > ? __pfx___mutex_lock+0x10/0x10 > ? __pfx_vfs_read+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? __fget_files+0x1b1/0x2f0 > ksys_read+0xf4/0x1c0 > ? __pfx_ksys_read+0x10/0x10 > do_syscall_64+0xbb/0x360 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f1807d1ba9a > Code: 55 48 89 e5 48 83 ec 20 48 89 55 e8 48 89 75 f0 89 7d f8 e8 c8 ca f7 ff 48 8b 55 e8 48 8b 75 f0 41 89 c0 8b 7d f8 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 2e 44 89 c7 48 89 45 f8 e8 22 cb f7 ff 48 8b > RSP: 002b:00007f1807425440 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 > RAX: ffffffffffffffda RBX: 000055a4e236a820 RCX: 00007f1807d1ba9a > RDX: 0000000000001fa0 RSI: 00007f1807425c80 RDI: 0000000000000005 > RBP: 00007f1807425460 R08: 0000000000000000 R09: 000055a4e2373348 > R10: 00000000000001d4 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f1807425c80 R14: 0000000000020001 R15: 00007f1807426368 > > Modules linked in: > CR2: ffffde2055761988 > ---[ end trace 0000000000000000 ]--- > RIP: 0010:__cgroup_account_cputime_field+0x6a/0x130 > Code: 00 00 00 48 03 9d f0 03 00 00 83 fe 01 74 2a 76 4b 83 ee 02 83 fe 02 77 62 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 97 00 00 00 4c 01 23 eb 42 48 b8 00 00 00 00 00 > RSP: 0018:ffff88811af88d30 EFLAGS: 00010016 > RAX: dffffc0000000000 RBX: ffff1102abb0cc40 RCX: 0000000000010000 > RDX: 1fffe22055761988 RSI: 0000000000000000 RDI: ffff888100ef53f0 > RBP: ffff888100ef5000 R08: 0000000000000000 R09: 0000000000000000 > R10: ffffffffae4aa457 R11: ffff88811afa96e8 R12: 00000000000f4240 > R13: 0000000000000002 R14: ffff888107a21578 R15: 00000000fffe958d > FS: 00007f18074466c0(0000) GS:ffff88816bb13000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffde2055761988 CR3: 000000010b9ec000 CR4: 0000000000350ef0 > Kernel panic - not syncing: Fatal exception in interrupt > Kernel Offset: 0x28200000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) > ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]--- > > # Report 3 > > # ----------------------------------------- > # running ./gup_test -ct -F 0x1 0 19 0x1000 > # ----------------------------------------- > # TAP version 13 > # 1..1 > ================================================================== > BUG: KASAN: stack-out-of-bounds in snapshot_page+0x27e/0x5b0 > Read of size 256 at addr ffff88810360fc50 by task gup_test/2123 > > CPU: 3 UID: 0 PID: 2123 Comm: gup_test Not tainted 6.16.0-rc5 #24 PREEMPT(voluntary) > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > Call Trace: > > dump_stack_lvl+0x66/0xa0 > print_report+0xd0/0x640 > ? snapshot_page+0x27e/0x5b0 > ? srso_return_thunk+0x5/0x5f > ? __virt_addr_valid+0x208/0x3f0 > ? snapshot_page+0x27e/0x5b0 > kasan_report+0xe4/0x120 > ? snapshot_page+0x27e/0x5b0 > kasan_check_range+0x105/0x1b0 > __asan_memcpy+0x23/0x60 > snapshot_page+0x27e/0x5b0 > ? desc_read_finalized_seq+0x75/0x130 > ? __asan_memcpy+0x3c/0x60 > ? __pfx_snapshot_page+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? srso_return_thunk+0x5/0x5f > ? _raw_spin_unlock_irqrestore+0x22/0x50 > ? prb_read_valid+0x64/0x90 > __dump_page+0x9b/0x590 > ? __pfx___dump_page+0x10/0x10 > ? __pfx__printk+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? mark_held_locks+0x40/0x70 > ? dump_page+0x34/0x80 > dump_page+0x34/0x80 > gup_test_ioctl+0xef0/0x1630 > ? __pfx_gup_test_ioctl+0x10/0x10 > ? srso_return_thunk+0x5/0x5f > ? __pfx_ioctl_has_perm.constprop.0.isra.0+0x10/0x10 > ? __fget_files+0x1a7/0x2f0 > ? srso_return_thunk+0x5/0x5f > ? lock_release+0xc5/0x290 > __x64_sys_ioctl+0x134/0x1c0 > do_syscall_64+0xbb/0x360 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f02c0924ded > Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00 > RSP: 002b:00007f02b87fedd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007f02b87ffcdc RCX: 00007f02c0924ded > RDX: 00007f02b87fee30 RSI: 00000000c0506706 RDI: 0000000000000004 > RBP: 00007f02b87fee20 R08: 0000000000000000 R09: 00007f02b87ff6c0 > R10: 00007f02c0818808 R11: 0000000000000246 R12: 00007f02b87ff6c0 > R13: ffffffff3faf98ff R14: 0000000000000000 R15: 00007ffe07145b50 > > > The buggy address belongs to stack of task gup_test/2123 > and is located at offset 288 in frame: > __dump_page+0x0/0x590 > > This frame has 1 object: > [32, 384) 'ps' > > The buggy address belongs to the physical page: > > Memory state around the buggy address: > ffff88810360fb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88810360fc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >> ffff88810360fc80: 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 f3 00 00 > ^ > ffff88810360fd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88810360fd80: 00 00 00 f1 f1 f1 f1 f1 f1 00 f2 f2 f2 00 00 00 > ================================================================== > traps: PANIC: double fault, error_code: 0x0 > Oops: double fault: 0000 [#1] SMP KASAN NOPTI > CPU: 3 UID: 0 PID: 2123 Comm: gup_test Tainted: G B 6.16.0-rc5 #24 PREEMPT(voluntary) > Tainted: [B]=BAD_PAGE > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > RIP: 0010:number+0x1c/0xa00 > Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 41 55 41 54 49 89 f4 55 53 48 89 fb 48 81 ec f8 00 00 00 48 8d 44 24 58 <48> 89 54 24 08 48 ba 00 00 00 00 00 fc ff df 48 8d 7c 24 78 48 c7 > RSP: 0018:ffff8881035bdfe8 EFLAGS: 00010096 > RAX: ffff8881035be040 RBX: ffff8881035be349 RCX: ffffffffffff0a01 > RDX: 0000000000000000 RSI: ffff8881035be340 RDI: ffff8881035be349 > RBP: ffff8881035be1e8 R08: 0000000000000001 R09: 203a656761703401 > R10: 0000000000000004 R11: ffff8881035be338 R12: ffff8881035be340 > R13: ffff8881035be349 R14: ffff8881035be2f8 R15: 0000000000000010 > FS: 00007f02b87ff6c0(0000) GS:ffff88818e7a2000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffff8881035bdfd8 CR3: 000000010c1d3000 CR4: 0000000000350ef0 > Call Trace: > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:number+0x1c/0xa00 > Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 41 55 41 54 49 89 f4 55 53 48 89 fb 48 81 ec f8 00 00 00 48 8d 44 24 58 <48> 89 54 24 08 48 ba 00 00 00 00 00 fc ff df 48 8d 7c 24 78 48 c7 > RSP: 0018:ffff8881035bdfe8 EFLAGS: 00010096 > RAX: ffff8881035be040 RBX: ffff8881035be349 RCX: ffffffffffff0a01 > RDX: 0000000000000000 RSI: ffff8881035be340 RDI: ffff8881035be349 > RBP: ffff8881035be1e8 R08: 0000000000000001 R09: 203a656761703401 > R10: 0000000000000004 R11: ffff8881035be338 R12: ffff8881035be340 > R13: ffff8881035be349 R14: ffff8881035be2f8 R15: 0000000000000010 > FS: 00007f02b87ff6c0(0000) GS:ffff88818e7a2000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffff8881035bdfd8 CR3: 000000010c1d3000 CR4: 0000000000350ef0 > Kernel panic - not syncing: Fatal exception in interrupt > Kernel Offset: 0x5a00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) > ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]--- > Marking unfinished test run as failed > >> David Hildenbrand (1): >> mm/memory: introduce is_huge_zero_pfn() and use it in >> vm_normal_page_pmd() >> >> Luiz Capitulino (3): >> mm/util: introduce snapshot_page() >> proc: kpagecount: use snapshot_page() >> fs: stable_page_flags(): use snapshot_page() >> >> fs/proc/page.c | 50 +++++++++++++++----------- >> include/linux/huge_mm.h | 12 ++++++- >> include/linux/mm.h | 19 ++++++++++ >> mm/debug.c | 42 +++------------------- >> mm/memory.c | 2 +- >> mm/util.c | 77 +++++++++++++++++++++++++++++++++++++++++ >> 6 files changed, 142 insertions(+), 60 deletions(-) >> >> -- >> 2.50.0 >> >> >