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AFNElJ/22uWXi/sEsXBYgTJ8jLpjVQ0DdC3cFaSmEALxH9hs5lCoUNihQvPfAxJdgsFhkm6g/Kwuic7R8A==@kvack.org X-Gm-Message-State: AOJu0YwUh+Qk2vq47DJBnSxxbKngDtuwAPxchfkNIlrkzZMts34WX8f2 ZynOMWTXw0nLbobHf7MOqv5hsZ3uG/1RdMb0LAcugIVrxjB7VtUqzdXF6Np7l2JXBOvwDNQ3eYG /HaCneuEgD/nm+nML0TpAXzKnrN6BqME+utz19JZvn5BqBvKvdV6HJF7GrrA= MIME-Version: 1.0 X-Received: by 2002:a05:6820:55cf:b0:696:2b58:4ac0 with SMTP id 006d021491bc7-6962b58521emr2864608eaf.35.1777230113545; Sun, 26 Apr 2026 12:01:53 -0700 (PDT) Date: Sun, 26 Apr 2026 12:01:53 -0700 In-Reply-To: <20260426125719.24698-1-osalvador@suse.de> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69ee6121.170a0220.11de9.0010.GAE@google.com> Subject: [syzbot ci] Re: Implement a new generic pagewalk API From: syzbot ci To: akpm@linux-foundation.org, david@kernel.org, david@redhat.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, mhocko@suse.com, muchun.song@linux.dev, osalvador@suse.de, vbabka@kernel.org Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 8CE95180004 X-Rspam-User: X-Stat-Signature: xk3ninkw1jzatax8f47pkugxnuj6jj75 X-HE-Tag: 1777230114-19735 X-HE-Meta: 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Gt4VFKLoISs= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: syzbot ci has tested the following series [v2] Implement a new generic pagewalk API https://lore.kernel.org/all/20260426125719.24698-1-osalvador@suse.de * [RFC PATCH v2 1/7] mm: Add softleaf_from_pud * [RFC PATCH v2 2/7] mm: Add {pmd,pud}_huge_lock helper * [RFC PATCH v2 3/7] mm: Implement folio_pmd_batch * [RFC PATCH v2 4/7] mm: Implement pt_range_walk * [RFC PATCH v2 5/7] mm: Make /proc/pid/smaps use the new generic pagewalk API * [RFC PATCH v2 6/7] mm: Make /proc/pid/numa_maps use the new generic pagewalk API * [RFC PATCH v2 7/7] mm: Make /proc/pid/pagemap use the new generic pagewalk API and found the following issues: * KASAN: slab-out-of-bounds Write in pagemap_read * WARNING in __page_table_check_pmds_set * WARNING in pt_range_walk * WARNING: bad unlock balance in pt_range_walk Full report is available here: https://ci.syzbot.org/series/409219de-ca42-45a5-9204-0b315095160c *** KASAN: slab-out-of-bounds Write in pagemap_read tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 819bd270abf9de3b7f306e233054b85a07c47820 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/0361816f-57b2-43e4-aef2-186d8d35fdc9/config syz repro: https://ci.syzbot.org/findings/7f740037-7398-46f2-aa01-a57caa186d06/syz_repro ================================================================== BUG: KASAN: slab-out-of-bounds in add_to_pagemap fs/proc/task_mmu.c:1776 [inline] BUG: KASAN: slab-out-of-bounds in pagemap_read_walk_range fs/proc/task_mmu.c:2949 [inline] BUG: KASAN: slab-out-of-bounds in pagemap_read+0x1d60/0x2810 fs/proc/task_mmu.c:3092 Write of size 8 at addr ffff88816f1bd000 by task syz.1.18/5957 CPU: 1 UID: 0 PID: 5957 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 add_to_pagemap fs/proc/task_mmu.c:1776 [inline] pagemap_read_walk_range fs/proc/task_mmu.c:2949 [inline] pagemap_read+0x1d60/0x2810 fs/proc/task_mmu.c:3092 vfs_read+0x20c/0xa70 fs/read_write.c:572 ksys_pread64 fs/read_write.c:765 [inline] __do_sys_pread64 fs/read_write.c:773 [inline] __se_sys_pread64 fs/read_write.c:770 [inline] __x64_sys_pread64+0x199/0x230 fs/read_write.c:770 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f340679cdd9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 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 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f34075d2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 RAX: ffffffffffffffda RBX: 00007f3406a15fa0 RCX: 00007f340679cdd9 RDX: 0000000000019020 RSI: 0000200000000200 RDI: 0000000000000003 RBP: 00007f3406832d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000001000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3406a16038 R14: 00007f3406a15fa0 R15: 00007ffdb721f7e8 Allocated by task 5957: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5339 kmalloc_noprof include/linux/slab.h:962 [inline] kmalloc_array_noprof include/linux/slab.h:1109 [inline] pagemap_read+0x27d/0x2810 fs/proc/task_mmu.c:3033 vfs_read+0x20c/0xa70 fs/read_write.c:572 ksys_pread64 fs/read_write.c:765 [inline] __do_sys_pread64 fs/read_write.c:773 [inline] __se_sys_pread64 fs/read_write.c:770 [inline] __x64_sys_pread64+0x199/0x230 fs/read_write.c:770 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88816f1bc000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 0 bytes to the right of allocated 4096-byte region [ffff88816f1bc000, ffff88816f1bd000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88816f1b8000 pfn:0x16f1b8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 057ff00000000240 ffff888100042140 ffff888160400a08 ffffea0005c6fe10 raw: ffff88816f1b8000 0000000000040003 00000000f5000000 0000000000000000 head: 057ff00000000240 ffff888100042140 ffff888160400a08 ffffea0005c6fe10 head: ffff88816f1b8000 0000000000040003 00000000f5000000 0000000000000000 head: 057ff00000000003 ffffea0005bc6e01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5715, tgid 5715 (rm), ts 50636400155, free_ts 46909302793 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_slab_page mm/slub.c:3255 [inline] allocate_slab+0x77/0x660 mm/slub.c:3444 new_slab mm/slub.c:3502 [inline] refill_objects+0x331/0x3c0 mm/slub.c:7134 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x2b9/0x620 mm/slub.c:4578 alloc_from_pcs mm/slub.c:4681 [inline] slab_alloc_node mm/slub.c:4815 [inline] __do_kmalloc_node mm/slub.c:5218 [inline] __kmalloc_noprof+0x474/0x760 mm/slub.c:5231 kmalloc_noprof include/linux/slab.h:966 [inline] tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x283/0x560 security/tomoyo/file.c:827 tomoyo_path_unlink+0xaa/0xf0 security/tomoyo/tomoyo.c:162 security_path_unlink+0x15f/0x330 security/security.c:1457 filename_unlinkat+0x349/0x610 fs/namei.c:5537 __do_sys_unlink fs/namei.c:5575 [inline] __se_sys_unlink+0x2e/0x140 fs/namei.c:5572 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5257 tgid 5257 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978 __slab_free+0x263/0x2b0 mm/slub.c:5532 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4501 [inline] slab_alloc_node mm/slub.c:4830 [inline] kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4837 alloc_filename fs/namei.c:142 [inline] do_getname+0x2e/0x250 fs/namei.c:182 getname_flags fs/namei.c:225 [inline] getname include/linux/fs.h:2512 [inline] class_filename_constructor include/linux/fs.h:2539 [inline] __do_sys_unlink fs/namei.c:5574 [inline] __se_sys_unlink+0x1e/0x140 fs/namei.c:5572 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88816f1bcf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88816f1bcf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88816f1bd000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88816f1bd080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88816f1bd100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== *** WARNING in __page_table_check_pmds_set tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 819bd270abf9de3b7f306e233054b85a07c47820 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/0361816f-57b2-43e4-aef2-186d8d35fdc9/config syz repro: https://ci.syzbot.org/findings/f8fe52b4-cef7-4d25-8e60-cbbb1a4f4df5/syz_repro ------------[ cut here ]------------ softleaf_cached_writable(entry) WARNING: mm/page_table_check.c:227 at page_table_check_pmd_flags mm/page_table_check.c:227 [inline], CPU#1: syz.0.17/6022 WARNING: mm/page_table_check.c:227 at __page_table_check_pmds_set+0x18e/0x340 mm/page_table_check.c:240, CPU#1: syz.0.17/6022 Modules linked in: CPU: 1 UID: 0 PID: 6022 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:page_table_check_pmd_flags mm/page_table_check.c:227 [inline] RIP: 0010:__page_table_check_pmds_set+0x18e/0x340 mm/page_table_check.c:240 Code: 89 fe e8 85 44 89 ff 48 b8 00 00 00 00 00 00 00 94 4c 01 f8 48 c1 e8 3b 0f 94 c0 4d 39 e5 76 0f 84 c0 74 0b e8 83 3f 89 ff 90 <0f> 0b 90 eb 05 e8 78 3f 89 ff 31 ff 89 ee e8 af 43 89 ff 41 89 ef RSP: 0018:ffffc90003ce7af8 EFLAGS: 00010293 RAX: ffffffff823c4d7d RBX: ffff888111416001 RCX: ffff88816cbd1d00 RDX: 0000000000000000 RSI: 6c00000000000000 RDI: 6c00000000000000 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000000002 R11: 0000000000000000 R12: c7fffffffffffffe R13: dfffffffdc9bfe06 R14: ffff888111416008 R15: 6c00000000000000 FS: 00007ff0386af6c0(0000) GS:ffff8882a9466000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555574a1a9e8 CR3: 00000001063c6000 CR4: 00000000000006f0 Call Trace: page_table_check_pmds_set include/linux/page_table_check.h:92 [inline] set_pmd_at arch/x86/include/asm/pgtable.h:1234 [inline] make_uffd_wp_pmd fs/proc/task_mmu.c:1903 [inline] pagemap_scan_walk fs/proc/task_mmu.c:2631 [inline] do_pagemap_scan fs/proc/task_mmu.c:2785 [inline] do_pagemap_cmd+0x3bd8/0x4310 fs/proc/task_mmu.c:3131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff03779cdd9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 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 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff0386af028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff037a16090 RCX: 00007ff03779cdd9 RDX: 00002000000001c0 RSI: 00000000c0606610 RDI: 0000000000000003 RBP: 00007ff037832d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff037a16128 R14: 00007ff037a16090 R15: 00007ffd47ec5488 *** WARNING in pt_range_walk tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 819bd270abf9de3b7f306e233054b85a07c47820 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/0361816f-57b2-43e4-aef2-186d8d35fdc9/config syz repro: https://ci.syzbot.org/findings/02bfe437-a81f-4510-9fff-4b769eb9a0a4/syz_repro ------------[ cut here ]------------ next_addr < vma->vm_start || next_addr >= vma->vm_end WARNING: mm/pagewalk.c:1052 at pt_range_walk+0x14e/0x35a0 mm/pagewalk.c:1052, CPU#1: syz.2.19/6013 Modules linked in: CPU: 1 UID: 0 PID: 6013 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:pt_range_walk+0x14e/0x35a0 mm/pagewalk.c:1052 Code: 74 08 48 89 df e8 12 1a 15 00 49 89 de 48 8b 1b 48 8b 7c 24 10 48 89 de e8 6f a5 aa ff 48 39 5c 24 10 73 13 e8 03 a3 aa ff 90 <0f> 0b 90 b8 01 00 00 00 e9 88 2b 00 00 49 8d 5e 08 48 89 d8 48 c1 RSP: 0018:ffffc90003d37920 EFLAGS: 00010293 RAX: ffffffff821b11f0 RBX: 0000200000800000 RCX: ffff8881134f5700 RDX: 0000000000000000 RSI: 0000200000800000 RDI: 0000200000800000 RBP: ffffc90003d37b30 R08: 00000000000000ff R09: 1ffff1102dc8b830 R10: dffffc0000000000 R11: ffffed102dc8b831 R12: ffff8881709b1800 R13: dffffc0000000000 R14: ffff8881709b1800 R15: 0000200000800000 FS: 00007f33141ff6c0(0000) GS:ffff8882a9466000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f331344f0d1 CR3: 000000017150e000 CR4: 00000000000006f0 Call Trace: pagemap_scan_walk fs/proc/task_mmu.c:2463 [inline] do_pagemap_scan fs/proc/task_mmu.c:2785 [inline] do_pagemap_cmd+0x3924/0x4310 fs/proc/task_mmu.c:3131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f331339cdd9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 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 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f33141ff028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3313615fa0 RCX: 00007f331339cdd9 RDX: 0000200000000140 RSI: 00000000c0606610 RDI: 0000000000000003 RBP: 00007f3313432d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3313616038 R14: 00007f3313615fa0 R15: 00007fff980e14d8 *** WARNING: bad unlock balance in pt_range_walk tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 819bd270abf9de3b7f306e233054b85a07c47820 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/0361816f-57b2-43e4-aef2-186d8d35fdc9/config syz repro: https://ci.syzbot.org/findings/1e53935d-6673-468b-905d-88da8f1e39f3/syz_repro loop1: detected capacity change from 0 to 4096 ===================================== WARNING: bad unlock balance detected! syzkaller #0 Not tainted ------------------------------------- syz.1.18/5968 is trying to release lock (ptlock_ptr(ptdesc)) at: [] spin_unlock include/linux/spinlock.h:389 [inline] [] pt_range_walk+0x25a/0x35a0 mm/pagewalk.c:1058 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz.1.18/5968: #0: ffff8881626b0340 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:601 [inline] #0: ffff8881626b0340 (&mm->mmap_lock){++++}-{4:4}, at: do_pagemap_scan fs/proc/task_mmu.c:2746 [inline] #0: ffff8881626b0340 (&mm->mmap_lock){++++}-{4:4}, at: do_pagemap_cmd+0x618/0x4310 fs/proc/task_mmu.c:3131 stack backtrace: CPU: 1 UID: 0 PID: 5968 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_unlock_imbalance_bug+0xdc/0xf0 kernel/locking/lockdep.c:5298 __lock_release kernel/locking/lockdep.c:5537 [inline] lock_release+0x248/0x3d0 kernel/locking/lockdep.c:5889 __raw_spin_unlock include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:389 [inline] pt_range_walk+0x25a/0x35a0 mm/pagewalk.c:1058 pagemap_scan_walk fs/proc/task_mmu.c:2463 [inline] do_pagemap_scan fs/proc/task_mmu.c:2785 [inline] do_pagemap_cmd+0x3924/0x4310 fs/proc/task_mmu.c:3131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0ce439cdd9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 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 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0ce5214028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0ce4615fa0 RCX: 00007f0ce439cdd9 RDX: 0000200000000140 RSI: 00000000c0606610 RDI: 0000000000000004 RBP: 00007f0ce4432d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0ce4616038 R14: 00007f0ce4615fa0 R15: 00007fffbeb73768 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.