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e9e14a558f8ab-39d26cea212mr8708615ab.2.1724038922993; Sun, 18 Aug 2024 20:42:02 -0700 (PDT) Date: Sun, 18 Aug 2024 20:42:02 -0700 In-Reply-To: <20240819032658.2766427-1-lizhi.xu@windriver.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000095953e06200117be@google.com> Subject: Re: [syzbot] [bcachefs?] KASAN: slab-out-of-bounds Write in bch2_dev_journal_init From: syzbot To: linux-kernel@vger.kernel.org, lizhi.xu@windriver.com, syzkaller-bugs@googlegroups.com 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 Write in bch2_dev_journal_init loop0: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-out-of-bounds in bch2_dev_journal_init+0x8ea/0xcf0 fs/bcachefs/journal.c:1349 Write of size 8 at addr ffff88800e56e7b0 by task syz.0.15/5578 CPU: 0 UID: 0 PID: 5578 Comm: syz.0.15 Not tainted 6.11.0-rc3-syzkaller-00338-gc3f2d783a459-dirty #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:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 bch2_dev_journal_init+0x8ea/0xcf0 fs/bcachefs/journal.c:1349 __bch2_dev_attach_bdev+0x217/0x340 fs/bcachefs/super.c:1390 bch2_dev_attach_bdev+0x2a8/0x6f0 fs/bcachefs/super.c:1420 bch2_fs_open+0x97c/0xdf0 fs/bcachefs/super.c:2122 bch2_fs_get_tree+0x731/0x1700 fs/bcachefs/fs.c:1933 vfs_get_tree+0x90/0x2a0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3472 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997 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: 0033:0x7fedc237b0ba Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 7e 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:00007fedc31b7e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fedc31b7ef0 RCX: 00007fedc237b0ba RDX: 00000000200058c0 RSI: 0000000020005900 RDI: 00007fedc31b7eb0 RBP: 00000000200058c0 R08: 00007fedc31b7ef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020005900 R13: 00007fedc31b7eb0 R14: 00000000000058ad R15: 0000000020005940 Allocated by task 5578: 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:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:685 [inline] kmalloc_array_noprof include/linux/slab.h:726 [inline] bch2_dev_journal_init+0x77c/0xcf0 fs/bcachefs/journal.c:1339 __bch2_dev_attach_bdev+0x217/0x340 fs/bcachefs/super.c:1390 bch2_dev_attach_bdev+0x2a8/0x6f0 fs/bcachefs/super.c:1420 bch2_fs_open+0x97c/0xdf0 fs/bcachefs/super.c:2122 bch2_fs_get_tree+0x731/0x1700 fs/bcachefs/fs.c:1933 vfs_get_tree+0x90/0x2a0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3472 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997 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 ffff88800e56e780 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes to the right of allocated 48-byte region [ffff88800e56e780, ffff88800e56e7b0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xe56e flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff8880158418c0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080200020 00000001fdffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5138, tgid 5138 (syz-executor), ts 83628656409, free_ts 36738612732 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __kmalloc_cache_node_noprof+0x20c/0x300 mm/slub.c:4197 kmalloc_node_noprof include/linux/slab.h:704 [inline] __get_vm_area_node+0x113/0x270 mm/vmalloc.c:3109 __vmalloc_node_range_noprof+0x3c6/0x1400 mm/vmalloc.c:3794 __vmalloc_node_noprof mm/vmalloc.c:3899 [inline] vzalloc_noprof+0x79/0x90 mm/vmalloc.c:3972 alloc_counters+0xd7/0x740 net/ipv4/netfilter/ip_tables.c:799 copy_entries_to_user net/ipv4/netfilter/arp_tables.c:681 [inline] get_entries net/ipv4/netfilter/arp_tables.c:867 [inline] do_arpt_get_ctl+0xe77/0x16a0 net/ipv4/netfilter/arp_tables.c:1461 nf_getsockopt+0x299/0x2c0 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x222/0x2e0 net/ipv4/ip_sockglue.c:1777 tcp_getsockopt+0x163/0x1c0 net/ipv4/tcp.c:4409 page last free pid 28 tgid 28 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2612 __folio_put+0x2c8/0x440 mm/swap.c:128 migrate_folio_move mm/migrate.c:1330 [inline] migrate_pages_batch+0x2a76/0x3560 mm/migrate.c:1818 migrate_pages_sync mm/migrate.c:1884 [inline] migrate_pages+0x1f59/0x3460 mm/migrate.c:1993 compact_zone+0x3404/0x4af0 mm/compaction.c:2671 compact_node+0x2de/0x460 mm/compaction.c:2935 kcompactd+0x788/0x1530 mm/compaction.c:3233 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff88800e56e680: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88800e56e700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88800e56e780: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff88800e56e800: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88800e56e880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== Tested on: commit: c3f2d783 Merge tag 'mm-hotfixes-stable-2024-08-17-19-3.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=14bc03e5980000 kernel config: https://syzkaller.appspot.com/x/.config?x=7229118d88b4a71b dashboard link: https://syzkaller.appspot.com/bug?extid=47ecc948aadfb2ab3efc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=155d8b83980000