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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:19c8:b0:3e4:9a1:6542 with SMTP id e9e14a558f8ab-3e921c51667mr187231425ab.18.1756111953724; Mon, 25 Aug 2025 01:52:33 -0700 (PDT) Date: Mon, 25 Aug 2025 01:52:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68ac2451.050a0220.37038e.008a.GAE@google.com> Subject: [syzbot] [bcachefs?] KASAN: slab-use-after-free Read in __bch2_journal_key_search 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: 7fa4d8dc380f Add linux-next specific files for 20250821 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=124b8062580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5d054fcd55656377 dashboard link: https://syzkaller.appspot.com/bug?extid=64ebb0de0a7a7a1535bd compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14b53fa2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1569aa34580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a843be98ab42/disk-7fa4d8dc.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/17b718892b67/vmlinux-7fa4d8dc.xz kernel image: https://storage.googleapis.com/syzbot-assets/8939424b4b54/bzImage-7fa4d8dc.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/5918c7367d54/mount_0.gz The issue was bisected to: commit aecfff73c6c0ef4d697aa17d752d45f60230a649 Author: Kent Overstreet Date: Thu Aug 14 14:28:41 2025 +0000 bcachefs: accounting_read() improvemnts bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=118d4062580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=138d4062580000 console output: https://syzkaller.appspot.com/x/log.txt?x=158d4062580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+64ebb0de0a7a7a1535bd@syzkaller.appspotmail.com Fixes: aecfff73c6c0 ("bcachefs: accounting_read() improvemnts") bcachefs (loop0): set_node_max(): u64s 11 type btree_ptr_v2 0:82:0 len 0 ver 0: seq 4dc858ad08044b41 written 16 min_key POS_MIN durability: 1 ptr: 0:141:0 gen 0 -> SPOS_MAX done bcachefs (loop0): accounting_read... done bcachefs (loop0): alloc_read... done bcachefs (loop0): snapshots_read... done bcachefs (loop0): check_allocations... ================================================================== BUG: KASAN: slab-use-after-free in __journal_key_cmp fs/bcachefs/btree_journal_iter.h:63 [inline] BUG: KASAN: slab-use-after-free in __bch2_journal_key_search+0x57b/0x12e0 fs/bcachefs/btree_journal_iter.c:54 Read of size 4 at addr ffff88802f05fe94 by task syz.0.17/6037 CPU: 0 UID: 0 PID: 6037 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 __journal_key_cmp fs/bcachefs/btree_journal_iter.h:63 [inline] __bch2_journal_key_search+0x57b/0x12e0 fs/bcachefs/btree_journal_iter.c:54 bch2_journal_key_search fs/bcachefs/btree_journal_iter.c:73 [inline] bch2_journal_iter_init fs/bcachefs/btree_journal_iter.c:540 [inline] __bch2_btree_and_journal_iter_init_node_iter+0x3ad/0x9f0 fs/bcachefs/btree_journal_iter.c:659 btree_node_iter_and_journal_peek+0x210/0x10a0 fs/bcachefs/btree_iter.c:899 btree_path_down fs/bcachefs/btree_iter.c:956 [inline] bch2_btree_path_traverse_one+0x148d/0x21d0 fs/bcachefs/btree_iter.c:1199 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:252 [inline] __bch2_btree_iter_peek fs/bcachefs/btree_iter.c:2266 [inline] bch2_btree_iter_peek_max+0xa56/0x6580 fs/bcachefs/btree_iter.c:2385 bch2_btree_iter_peek_max_type fs/bcachefs/btree_iter.h:769 [inline] bch2_gc_btree fs/bcachefs/btree_gc.c:736 [inline] bch2_gc_btrees fs/bcachefs/btree_gc.c:800 [inline] bch2_check_allocations+0x149b/0x5870 fs/bcachefs/btree_gc.c:1099 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:487 [inline] __bch2_run_recovery_passes+0x3b7/0x1090 fs/bcachefs/recovery_passes.c:543 bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:614 bch2_fs_recovery+0x1af4/0x2c20 fs/bcachefs/recovery.c:813 bch2_fs_start+0x97f/0xd10 fs/bcachefs/super.c:1405 bch2_fs_get_tree+0xb35/0x1540 fs/bcachefs/fs.c:2446 vfs_get_tree+0x92/0x2b0 fs/super.c:1752 do_new_mount+0x2a2/0xa30 fs/namespace.c:3810 do_mount fs/namespace.c:4138 [inline] __do_sys_mount fs/namespace.c:4349 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4326 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc56719038a 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:00007ffc8714bdf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffc8714be80 RCX: 00007fc56719038a RDX: 0000200000024c80 RSI: 0000200000000080 RDI: 00007ffc8714be40 RBP: 0000200000024c80 R08: 00007ffc8714be80 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000080 R13: 00007ffc8714be40 R14: 0000000000024c6a R15: 0000200000000180 Allocated by task 6037: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x21c/0x3a0 mm/slub.c:4396 kmalloc_noprof include/linux/slab.h:909 [inline] bch2_journal_key_insert fs/bcachefs/btree_journal_iter.c:360 [inline] bch2_journal_key_delete+0xff/0x230 fs/bcachefs/btree_journal_iter.c:379 bch2_btree_repair_topology_recurse+0xeb2/0x5070 fs/bcachefs/btree_gc.c:379 bch2_check_topology+0x1059/0x19f0 fs/bcachefs/btree_gc.c:614 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:487 [inline] __bch2_run_recovery_passes+0x3b7/0x1090 fs/bcachefs/recovery_passes.c:543 bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:614 bch2_fs_recovery+0x1af4/0x2c20 fs/bcachefs/recovery.c:813 bch2_fs_start+0x97f/0xd10 fs/bcachefs/super.c:1405 bch2_fs_get_tree+0xb35/0x1540 fs/bcachefs/fs.c:2446 vfs_get_tree+0x92/0x2b0 fs/super.c:1752 do_new_mount+0x2a2/0xa30 fs/namespace.c:3810 do_mount fs/namespace.c:4138 [inline] __do_sys_mount fs/namespace.c:4349 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4326 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6037: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kfree+0x18e/0x440 mm/slub.c:4879 bch2_journal_key_insert_take+0x160e/0x1af0 fs/bcachefs/btree_journal_iter.c:300 set_node_max+0x3f7/0x680 fs/bcachefs/btree_gc.c:172 btree_repair_node_end fs/bcachefs/btree_gc.c:329 [inline] bch2_btree_repair_topology_recurse+0x3942/0x5070 fs/bcachefs/btree_gc.c:447 bch2_check_topology+0x1059/0x19f0 fs/bcachefs/btree_gc.c:614 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:487 [inline] __bch2_run_recovery_passes+0x3b7/0x1090 fs/bcachefs/recovery_passes.c:543 bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:614 bch2_fs_recovery+0x1af4/0x2c20 fs/bcachefs/recovery.c:813 bch2_fs_start+0x97f/0xd10 fs/bcachefs/super.c:1405 bch2_fs_get_tree+0xb35/0x1540 fs/bcachefs/fs.c:2446 vfs_get_tree+0x92/0x2b0 fs/super.c:1752 do_new_mount+0x2a2/0xa30 fs/namespace.c:3810 do_mount fs/namespace.c:4138 [inline] __do_sys_mount fs/namespace.c:4349 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4326 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802f05fe80 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 20 bytes inside of freed 64-byte region [ffff88802f05fe80, ffff88802f05fec0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2f05f anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801a8418c0 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000200020 00000000f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 11474234050, free_ts 11427462095 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab+0x8a/0x330 mm/slub.c:2655 new_slab mm/slub.c:2709 [inline] ___slab_alloc+0xbd1/0x13e0 mm/slub.c:3891 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] __kmalloc_cache_noprof+0x282/0x3a0 mm/slub.c:4391 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1043 [inline] snd_device_new+0x7b/0x320 sound/core/device.c:37 snd_timer_new+0x516/0x6d0 sound/core/timer.c:953 snd_pcm_timer_init+0x162/0x3e0 sound/core/pcm_timer.c:108 snd_pcm_dev_register+0x6be/0x920 sound/core/pcm.c:1080 __snd_device_register sound/core/device.c:149 [inline] snd_device_register_all+0xd0/0x1b0 sound/core/device.c:197 snd_card_register+0x1cf/0x760 sound/core/init.c:893 loopback_probe+0xe27/0x1420 sound/drivers/aloop.c:1831 platform_probe+0xf6/0x190 drivers/base/platform.c:1405 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x26d/0x9e0 drivers/base/dd.c:659 page last free pid 43 tgid 43 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895 vfree+0x25a/0x400 mm/vmalloc.c:3434 delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3353 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff88802f05fd80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff88802f05fe00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff88802f05fe80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88802f05ff00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff88802f05ff80: 00 00 00 00 00 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