================================================================== BUG: KASAN: use-after-free in nilfs_test_metadata_dirty+0x39/0x210 fs/nilfs2/segment.c:813 Read of size 8 at addr ffff88801d1dbe30 by task syz-executor.4/3638 CPU: 1 PID: 3638 Comm: syz-executor.4 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x1f0 mm/kasan/report.c:433 kasan_report+0xc3/0xf0 mm/kasan/report.c:495 nilfs_test_metadata_dirty+0x39/0x210 fs/nilfs2/segment.c:813 nilfs_segctor_confirm+0x78/0x2d0 fs/nilfs2/segment.c:837 nilfs_segctor_destroy fs/nilfs2/segment.c:2729 [inline] nilfs_detach_log_writer+0x4c1/0xbd0 fs/nilfs2/segment.c:2810 nilfs_put_super+0x4b/0x150 fs/nilfs2/super.c:468 generic_shutdown_super+0x130/0x310 fs/super.c:491 kill_block_super+0x79/0xd0 fs/super.c:1427 deactivate_locked_super+0xa7/0xf0 fs/super.c:331 cleanup_mnt+0x4ce/0x560 fs/namespace.c:1186 task_work_run+0x146/0x1c0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:294 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f60ef68ca17 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 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:00007ffdc9e0fbe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f60ef68ca17 RDX: 00007ffdc9e0fcbc RSI: 000000000000000a RDI: 00007ffdc9e0fcb0 RBP: 00007ffdc9e0fcb0 R08: 00000000ffffffff R09: 00007ffdc9e0fa80 R10: 0000555555db98b3 R11: 0000000000000246 R12: 00007f60ef6e55f6 R13: 00007ffdc9e10d70 R14: 0000555555db9810 R15: 00007ffdc9e10db0 Allocated by task 28878: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc+0xcd/0x100 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:234 [inline] kmem_cache_alloc_trace+0x97/0x310 mm/slub.c:3289 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] nilfs_find_or_create_root+0x142/0x4f0 fs/nilfs2/the_nilfs.c:747 nilfs_attach_checkpoint+0xcd/0x4a0 fs/nilfs2/super.c:519 nilfs_fill_super+0x2e8/0x5d0 fs/nilfs2/super.c:1064 nilfs_mount+0x613/0x9b0 fs/nilfs2/super.c:1317 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x289/0xad0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 3638: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1759 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xda/0x210 mm/slub.c:4567 nilfs_evict_inode+0xe5/0x3d0 fs/nilfs2/inode.c:908 evict+0x2a4/0x620 fs/inode.c:664 dispose_list fs/inode.c:697 [inline] evict_inodes+0x658/0x700 fs/inode.c:747 generic_shutdown_super+0x94/0x310 fs/super.c:479 kill_block_super+0x79/0xd0 fs/super.c:1427 deactivate_locked_super+0xa7/0xf0 fs/super.c:331 cleanup_mnt+0x4ce/0x560 fs/namespace.c:1186 task_work_run+0x146/0x1c0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:294 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x2b/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 call_rcu+0x163/0x970 kernel/rcu/tree.c:2796 fib_create_info+0x18d0/0x2410 net/ipv4/fib_semantics.c:1580 fib_table_insert+0x1e5/0x1f50 net/ipv4/fib_trie.c:1236 fib_magic+0x451/0x650 net/ipv4/fib_frontend.c:1098 fib_add_ifaddr+0x143/0x5c0 net/ipv4/fib_frontend.c:1120 fib_netdev_event+0x628/0x740 net/ipv4/fib_frontend.c:1480 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:455 __dev_notify_flags+0x2ef/0x5d0 dev_change_flags+0xe3/0x190 net/core/dev.c:8615 do_setlink+0xef5/0x3d40 net/core/rtnetlink.c:2788 __rtnl_newlink net/core/rtnetlink.c:3547 [inline] rtnl_newlink+0x1748/0x1fa0 net/core/rtnetlink.c:3594 rtnetlink_rcv_msg+0x772/0xe60 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2540 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] __sys_sendto+0x46e/0x5f0 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2125 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88801d1dbe00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 48 bytes inside of 256-byte region [ffff88801d1dbe00, ffff88801d1dbf00) The buggy address belongs to the physical page: page:ffffea0000747680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d1da head:ffffea0000747680 order:1 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001e70980 dead000000000003 ffff888012041b40 raw: 0000000000000000 0000000080100010 00000001ffffffff 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 3637, tgid 3637 (syz-executor.1), ts 117611899396, free_ts 115351333736 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0x70/0xf0 mm/slub.c:1829 allocate_slab+0x5e/0x520 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x3ee/0xc40 mm/slub.c:3036 __slab_alloc mm/slub.c:3123 [inline] slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3256 [inline] kmem_cache_alloc_trace+0x25f/0x310 mm/slub.c:3287 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] ____ip_mc_inc_group+0x2e9/0xae0 net/ipv4/igmp.c:1449 __ip_mc_inc_group net/ipv4/igmp.c:1484 [inline] ip_mc_inc_group net/ipv4/igmp.c:1490 [inline] ip_mc_up+0x119/0x2d0 net/ipv4/igmp.c:1789 inetdev_event+0xf0e/0x14a0 net/ipv4/devinet.c:1577 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:455 __dev_notify_flags+0x2ef/0x5d0 dev_change_flags+0xe3/0x190 net/core/dev.c:8615 do_setlink+0xef5/0x3d40 net/core/rtnetlink.c:2788 __rtnl_newlink net/core/rtnetlink.c:3547 [inline] rtnl_newlink+0x1748/0x1fa0 net/core/rtnetlink.c:3594 rtnetlink_rcv_msg+0x772/0xe60 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2540 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3476 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3248 [inline] kmem_cache_alloc_node+0x1cc/0x350 mm/slub.c:3298 __alloc_skb+0xcf/0x2b0 net/core/skbuff.c:497 alloc_skb include/linux/skbuff.h:1265 [inline] nlmsg_new include/net/netlink.h:964 [inline] inet6_netconf_notify_devconf+0xf8/0x1b0 net/ipv6/addrconf.c:581 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7116 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7140 [inline] addrconf_notify+0x332/0xfe0 net/ipv6/addrconf.c:3679 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:1945 [inline] call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] dev_change_name+0x695/0x990 net/core/dev.c:1226 do_setlink+0xa73/0x3d40 net/core/rtnetlink.c:2761 __rtnl_newlink net/core/rtnetlink.c:3547 [inline] rtnl_newlink+0x1748/0x1fa0 net/core/rtnetlink.c:3594 rtnetlink_rcv_msg+0x772/0xe60 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2540 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345 Memory state around the buggy address: ffff88801d1dbd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801d1dbd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801d1dbe00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801d1dbe80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801d1dbf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================