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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:c24b:0:b0:3d4:3ab3:e1c9 with SMTP id e9e14a558f8ab-3d441a06d8cmr265782365ab.15.1741840141998; Wed, 12 Mar 2025 21:29:01 -0700 (PDT) Date: Wed, 12 Mar 2025 21:29:01 -0700 In-Reply-To: <1f4c7fbe-f666-45d2-911e-59fffdca905d@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67d25f0d.050a0220.14e108.002d.GAE@google.com> Subject: Re: [syzbot] [xfs?] KASAN: slab-out-of-bounds Read in xlog_cksum From: syzbot To: ardb@kernel.org, bp@alien8.de, chandan.babu@oracle.com, dave.hansen@linux.intel.com, ebiggers@kernel.org, hpa@zytor.com, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, mingo@redhat.com, sunjunchao2870@gmail.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: slab-out-of-bounds Read in xlog_cksum ======================================================= XFS (loop0): Mounting V5 Filesystem bfdc47fc-10d8-4eed-a562-11a831b3f791 ================================================================== BUG: KASAN: slab-out-of-bounds in crc32c_le_arch+0xc7/0x1b0 arch/x86/lib/crc32-glue.c:81 Read of size 8 at addr ffff888040eb5200 by task syz.0.16/5913 CPU: 0 UID: 0 PID: 5913 Comm: syz.0.16 Not tainted 6.14.0-rc6-syzkaller-gb7f94fcf5546 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 crc32c_le_arch+0xc7/0x1b0 arch/x86/lib/crc32-glue.c:81 __crc32c_le include/linux/crc32.h:36 [inline] crc32c include/linux/crc32c.h:9 [inline] xlog_cksum+0x91/0xf0 fs/xfs/xfs_log.c:1588 xlog_recover_process+0x78/0x1e0 fs/xfs/xfs_log_recover.c:2900 xlog_do_recovery_pass+0xa01/0xdc0 fs/xfs/xfs_log_recover.c:3235 xlog_verify_head+0x21f/0x5a0 fs/xfs/xfs_log_recover.c:1058 xlog_find_tail+0xa04/0xdf0 fs/xfs/xfs_log_recover.c:1315 xlog_recover+0xe1/0x540 fs/xfs/xfs_log_recover.c:3419 xfs_log_mount+0x252/0x3e0 fs/xfs/xfs_log.c:666 xfs_mountfs+0xfbb/0x2500 fs/xfs/xfs_mount.c:878 xfs_fs_fill_super+0x1223/0x1550 fs/xfs/xfs_super.c:1817 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f010618e90a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0106f3ce68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f0106f3cef0 RCX: 00007f010618e90a RDX: 0000400000000500 RSI: 0000400000000200 RDI: 00007f0106f3ceb0 RBP: 0000400000000500 R08: 00007f0106f3cef0 R09: 0000000002218a5d R10: 0000000002218a5d R11: 0000000000000246 R12: 0000400000000200 R13: 00007f0106f3ceb0 R14: 0000000000009706 R15: 0000400000000100 Allocated by task 5913: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_node_noprof+0x290/0x4d0 mm/slub.c:4300 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:662 xlog_do_recovery_pass+0x143/0xdc0 fs/xfs/xfs_log_recover.c:3016 xlog_verify_head+0x21f/0x5a0 fs/xfs/xfs_log_recover.c:1058 xlog_find_tail+0xa04/0xdf0 fs/xfs/xfs_log_recover.c:1315 xlog_recover+0xe1/0x540 fs/xfs/xfs_log_recover.c:3419 xfs_log_mount+0x252/0x3e0 fs/xfs/xfs_log.c:666 xfs_mountfs+0xfbb/0x2500 fs/xfs/xfs_mount.c:878 xfs_fs_fill_super+0x1223/0x1550 fs/xfs/xfs_super.c:1817 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888040eb5000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes to the right of allocated 512-byte region [ffff888040eb5000, ffff888040eb5200) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x40eb4 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801b041c80 ffffea0000d00580 dead000000000003 raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 04fff00000000040 ffff88801b041c80 ffffea0000d00580 dead000000000003 head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 04fff00000000001 ffffea000103ad01 ffffffffffffffff 0000000000000000 head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2, tgid 2 (kthreadd), ts 23865404352, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4740 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2587 new_slab mm/slub.c:2640 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826 __slab_alloc+0x58/0xa0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __kmalloc_cache_noprof+0x27b/0x390 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] set_kthread_struct+0xc2/0x330 kernel/kthread.c:126 copy_process+0x1179/0x3cf0 kernel/fork.c:2331 kernel_clone+0x226/0x8e0 kernel/fork.c:2815 kernel_thread+0x1c0/0x250 kernel/fork.c:2877 create_kthread kernel/kthread.c:487 [inline] kthreadd+0x60d/0x810 kernel/kthread.c:847 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 page_owner free stack trace missing Memory state around the buggy address: ffff888040eb5100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888040eb5180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888040eb5200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888040eb5280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888040eb5300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== Tested on: commit: b7f94fcf Merge tag 'sched_ext-for-6.14-rc6-fixes' of g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16f4cc78580000 kernel config: https://syzkaller.appspot.com/x/.config?x=31c94a07ddad0b00 dashboard link: https://syzkaller.appspot.com/bug?extid=9f6d080dece587cfdd4c compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Note: no patches were applied.