BTRFS: device fsid 24c7a497-3402-47dd-bef8-82358f5f30e0 devid 1 transid 8 /dev/loop0 scanned by syz-executor.0 (20126) ================================================================== BUG: KASAN: slab-use-after-free in btrfs_open_devices+0xb8/0xc0 fs/btrfs/volumes.c:1281 Read of size 4 at addr ffff888041051d30 by task syz-executor.0/20126 CPU: 1 PID: 20126 Comm: syz-executor.0 Not tainted 6.5.0-rc5-next-20230809-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 btrfs_open_devices+0xb8/0xc0 fs/btrfs/volumes.c:1281 btrfs_mount_root+0x681/0xda0 fs/btrfs/super.c:1505 legacy_get_tree+0x109/0x220 fs/fs_context.c:611 vfs_get_tree+0x88/0x350 fs/super.c:1544 fc_mount fs/namespace.c:1112 [inline] vfs_kern_mount.part.0+0xcb/0x170 fs/namespace.c:1142 vfs_kern_mount+0x3f/0x60 fs/namespace.c:1129 btrfs_mount+0x292/0xb10 fs/btrfs/super.c:1578 legacy_get_tree+0x109/0x220 fs/fs_context.c:611 vfs_get_tree+0x88/0x350 fs/super.c:1544 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f8b8be7e1ea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8b8cc92ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f8b8cc92f80 RCX: 00007f8b8be7e1ea RDX: 0000000020005100 RSI: 0000000020005140 RDI: 00007f8b8cc92f40 RBP: 0000000020005100 R08: 00007f8b8cc92f80 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020005140 R13: 00007f8b8cc92f40 R14: 00000000000050ef R15: 0000000020001180 Allocated by task 20126: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:599 [inline] kzalloc include/linux/slab.h:720 [inline] alloc_fs_devices+0x54/0x2b0 fs/btrfs/volumes.c:375 device_list_add.constprop.0+0x3eb/0x1db0 fs/btrfs/volumes.c:807 btrfs_scan_one_device+0x1b7/0x2a0 fs/btrfs/volumes.c:1405 btrfs_mount_root+0x4a8/0xda0 fs/btrfs/super.c:1482 legacy_get_tree+0x109/0x220 fs/fs_context.c:611 vfs_get_tree+0x88/0x350 fs/super.c:1544 fc_mount fs/namespace.c:1112 [inline] vfs_kern_mount.part.0+0xcb/0x170 fs/namespace.c:1142 vfs_kern_mount+0x3f/0x60 fs/namespace.c:1129 btrfs_mount+0x292/0xb10 fs/btrfs/super.c:1578 legacy_get_tree+0x109/0x220 fs/fs_context.c:611 vfs_get_tree+0x88/0x350 fs/super.c:1544 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 20128: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15e/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0xb8/0x2f0 mm/slub.c:3822 btrfs_close_devices+0x4cd/0x610 fs/btrfs/volumes.c:1207 open_ctree+0x1c1/0x5710 fs/btrfs/disk-io.c:3612 btrfs_fill_super fs/btrfs/super.c:1158 [inline] btrfs_mount_root+0x976/0xda0 fs/btrfs/super.c:1520 legacy_get_tree+0x109/0x220 fs/fs_context.c:611 vfs_get_tree+0x88/0x350 fs/super.c:1544 fc_mount fs/namespace.c:1112 [inline] vfs_kern_mount.part.0+0xcb/0x170 fs/namespace.c:1142 vfs_kern_mount+0x3f/0x60 fs/namespace.c:1129 btrfs_mount+0x292/0xb10 fs/btrfs/super.c:1578 legacy_get_tree+0x109/0x220 fs/fs_context.c:611 vfs_get_tree+0x88/0x350 fs/super.c:1544 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2653 pwq_release_workfn+0x244/0x380 kernel/workqueue.c:4138 kthread_worker_fn+0x2fc/0xa80 kernel/kthread.c:823 kthread+0x33a/0x430 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Second to last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2653 pwq_release_workfn+0x244/0x380 kernel/workqueue.c:4138 kthread_worker_fn+0x2fc/0xa80 kernel/kthread.c:823 kthread+0x33a/0x430 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 The buggy address belongs to the object at ffff888041051c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 304 bytes inside of freed 512-byte region [ffff888041051c00, ffff888041051e00) The buggy address belongs to the physical page: page:ffffea0001041400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x41050 head:ffffea0001041400 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012841c80 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 18389, tgid 18388 (syz-executor.3), ts 2432787169622, free_ts 2429503503127 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1567 prep_new_page mm/page_alloc.c:1574 [inline] get_page_from_freelist+0x10d7/0x31b0 mm/page_alloc.c:3253 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4509 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2298 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x24e/0x380 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8bc/0x1570 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x137/0x350 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1022 [inline] __kmalloc+0x4f/0x100 mm/slab_common.c:1036 kmalloc include/linux/slab.h:603 [inline] kzalloc include/linux/slab.h:720 [inline] fib6_info_alloc+0x40/0x100 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x337/0x1b70 net/ipv6/route.c:3747 ip6_route_add+0x26/0x150 net/ipv6/route.c:3841 addrconf_prefix_route+0x300/0x510 net/ipv6/addrconf.c:2434 add_v4_addrs+0x87e/0x9d0 net/ipv6/addrconf.c:3182 addrconf_sit_config net/ipv6/addrconf.c:3455 [inline] addrconf_init_auto_addrs+0x4ea/0x810 net/ipv6/addrconf.c:3492 addrconf_notify+0xe65/0x1920 net/ipv6/addrconf.c:3679 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1158 [inline] free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2380 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2475 kvfree+0x47/0x50 mm/util.c:650 deactivate_locked_super+0x9a/0x170 fs/super.c:330 deactivate_super+0xde/0x100 fs/super.c:361 cleanup_mnt+0x222/0x3d0 fs/namespace.c:1254 task_work_run+0x14d/0x240 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888041051c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888041051c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888041051d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888041051d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888041051e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================