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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3088:b0:3d3:f9e0:709b with SMTP id e9e14a558f8ab-3d6e576d541mr57143835ab.17.1743849149168; Sat, 05 Apr 2025 03:32:29 -0700 (PDT) Date: Sat, 05 Apr 2025 03:32:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67f106bd.050a0220.0a13.0235.GAE@google.com> Subject: [syzbot] [bcachefs?] KASAN: slab-use-after-free Read in bchfs_read From: syzbot To: kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: acc4d5ff0b61 Merge tag 'net-6.15-rc0' of git://git.kernel... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=15425274580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1dd3eb8e9a9c75c9 dashboard link: https://syzkaller.appspot.com/bug?extid=2deb10b8dc9aae6fab67 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=177d894c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=127d4fb0580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ee88ff7b5f77/disk-acc4d5ff.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ad1210e493cd/vmlinux-acc4d5ff.xz kernel image: https://storage.googleapis.com/syzbot-assets/1f3cc7813b7a/bzImage-acc4d5ff.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/7f634c35cdf6/mount_0.gz The issue was bisected to: commit 3ba0240a8789f8c059990b81c6f34c29769a5a49 Author: Kent Overstreet Date: Mon Mar 24 15:51:01 2025 +0000 bcachefs: Fix silent short reads in data read retry path bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1215494c580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=1115494c580000 console output: https://syzkaller.appspot.com/x/log.txt?x=1615494c580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2deb10b8dc9aae6fab67@syzkaller.appspotmail.com Fixes: 3ba0240a8789 ("bcachefs: Fix silent short reads in data read retry path") ================================================================== BUG: KASAN: slab-use-after-free in bchfs_read+0x2b48/0x3350 fs/bcachefs/fs-io-buffered.c:228 Read of size 4 at addr ffff8880756ac148 by task syz-executor406/5854 CPU: 0 UID: 0 PID: 5854 Comm: syz-executor406 Not tainted 6.14.0-syzkaller-12456-gacc4d5ff0b61 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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 bchfs_read+0x2b48/0x3350 fs/bcachefs/fs-io-buffered.c:228 bch2_readahead+0xe7a/0x12d0 fs/bcachefs/fs-io-buffered.c:301 read_pages+0x193/0x590 mm/readahead.c:160 page_cache_ra_order+0xa37/0xca0 mm/readahead.c:515 filemap_get_pages+0x59f/0x1fc0 mm/filemap.c:2590 filemap_read+0x466/0x1260 mm/filemap.c:2701 bch2_read_iter+0x1179/0x14b0 fs/bcachefs/fs-io-direct.c:221 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x9a0/0xb90 fs/read_write.c:570 ksys_read+0x19d/0x2d0 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc1adbabc59 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1b 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd419910a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ffd419910d0 RCX: 00007fc1adbabc59 RDX: 0000000000002020 RSI: 0000200000000800 RDI: 0000000000000004 RBP: 0000000000000001 R08: 00007ffd41990e47 R09: 00007ffd419910f0 R10: 0000000000000001 R11: 0000000000000246 R12: 00007ffd419910cc R13: 0000000000000002 R14: 431bde82d7b634db R15: 00007ffd41991110 Allocated by task 5854: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_mempool_unpoison_object+0x9e/0x170 mm/kasan/common.c:547 kasan_unpoison_element mm/mempool.c:-1 [inline] remove_element+0x129/0x1a0 mm/mempool.c:150 mempool_alloc_noprof+0x552/0x5a0 mm/mempool.c:408 bio_alloc_bioset+0x26f/0x1130 block/bio.c:554 bch2_readahead+0xbaf/0x12d0 fs/bcachefs/fs-io-buffered.c:290 read_pages+0x193/0x590 mm/readahead.c:160 page_cache_ra_order+0xa37/0xca0 mm/readahead.c:515 filemap_get_pages+0x59f/0x1fc0 mm/filemap.c:2590 filemap_read+0x466/0x1260 mm/filemap.c:2701 bch2_read_iter+0x1179/0x14b0 fs/bcachefs/fs-io-direct.c:221 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x9a0/0xb90 fs/read_write.c:570 ksys_read+0x19d/0x2d0 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5854: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_mempool_poison_object+0xaa/0x120 mm/kasan/common.c:522 kasan_mempool_poison_object include/linux/kasan.h:360 [inline] kasan_poison_element mm/mempool.c:118 [inline] add_element mm/mempool.c:141 [inline] mempool_free+0x1c8/0x390 mm/mempool.c:541 bch2_readpages_end_io+0x17c/0x1d0 fs/bcachefs/fs-io-buffered.c:36 bch2_rbio_done fs/bcachefs/io_read.c:430 [inline] __bch2_read_extent+0x1348/0x4400 fs/bcachefs/io_read.c:1257 bch2_read_extent fs/bcachefs/io_read.h:140 [inline] bchfs_read+0x251a/0x3350 fs/bcachefs/fs-io-buffered.c:226 bch2_readahead+0xe7a/0x12d0 fs/bcachefs/fs-io-buffered.c:301 read_pages+0x193/0x590 mm/readahead.c:160 page_cache_ra_order+0xa37/0xca0 mm/readahead.c:515 filemap_get_pages+0x59f/0x1fc0 mm/filemap.c:2590 filemap_read+0x466/0x1260 mm/filemap.c:2701 bch2_read_iter+0x1179/0x14b0 fs/bcachefs/fs-io-direct.c:221 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x9a0/0xb90 fs/read_write.c:570 ksys_read+0x19d/0x2d0 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880756ac000 which belongs to the cache bio-488 of size 488 The buggy address is located 328 bytes inside of freed 488-byte region [ffff8880756ac000, ffff8880756ac1e8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x756ac head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff888033497a00 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff888033497a00 dead000000000122 0000000000000000 head: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000 head: 00fff00000000001 ffffea0001d5ab01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 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 5854, tgid 5854 (syz-executor406), ts 92613750343, free_ts 91077243774 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1717 prep_new_page mm/page_alloc.c:1725 [inline] get_page_from_freelist+0x351d/0x36b0 mm/page_alloc.c:3652 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4934 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2459 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2623 new_slab mm/slub.c:2676 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3862 __slab_alloc+0x58/0xa0 mm/slub.c:3952 __slab_alloc_node mm/slub.c:4027 [inline] slab_alloc_node mm/slub.c:4188 [inline] kmem_cache_alloc_noprof+0x270/0x390 mm/slub.c:4207 mempool_init_node+0x1ee/0x4e0 mm/mempool.c:217 mempool_init_noprof+0x3a/0x50 mm/mempool.c:246 bioset_init+0x2ea/0x820 block/bio.c:1709 bch2_fs_io_read_init+0x29/0xc0 fs/bcachefs/io_read.c:1377 bch2_fs_alloc fs/bcachefs/super.c:944 [inline] bch2_fs_open+0x2f2f/0x32a0 fs/bcachefs/super.c:2182 bch2_fs_get_tree+0x77b/0x18f0 fs/bcachefs/fs.c:2172 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878 page last free pid 5830 tgid 5830 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_pages_ok+0xb17/0xd90 mm/page_alloc.c:1437 __folio_put+0x2b5/0x360 mm/swap.c:112 folio_put include/linux/mm.h:1563 [inline] free_large_kmalloc+0x143/0x1e0 mm/slub.c:4771 kfree+0x216/0x430 mm/slub.c:4839 bch2_dev_journal_exit+0x2ba/0x4a0 fs/bcachefs/journal.c:1478 bch2_dev_free+0x14d/0x230 fs/bcachefs/super.c:1220 bch2_fs_free+0x27b/0x3c0 fs/bcachefs/super.c:679 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x422/0x4c0 fs/namespace.c:1435 task_work_run+0x251/0x310 kernel/task_work.c:227 ptrace_notify+0x2dc/0x390 kernel/signal.c:2522 ptrace_report_syscall include/linux/ptrace.h:415 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline] syscall_exit_work+0xc7/0x1d0 kernel/entry/common.c:173 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline] syscall_exit_to_user_mode+0x24a/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880756ac000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880756ac080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880756ac100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880756ac180: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff8880756ac200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup