... Log Wrap ... Log Wrap ... Log Wrap ... ================================================================== BUG: KASAN: use-after-free in lmLogSync+0x924/0x9c0 fs/jfs/jfs_logmgr.c:1013 Write of size 4 at addr ffff888022aec220 by task jfsCommit/276 CPU: 0 PID: 276 Comm: jfsCommit Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 lmLogSync+0x924/0x9c0 fs/jfs/jfs_logmgr.c:1013 jfs_syncpt+0x77/0x90 fs/jfs/jfs_logmgr.c:1049 txEnd+0x2e1/0x520 fs/jfs/jfs_txnmgr.c:549 txLazyCommit fs/jfs/jfs_txnmgr.c:2718 [inline] jfs_lazycommit+0x5ba/0xb20 fs/jfs/jfs_txnmgr.c:2766 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 7009: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:735 [inline] open_inline_log fs/jfs/jfs_logmgr.c:1167 [inline] lmLogOpen+0x2c0/0xf90 fs/jfs/jfs_logmgr.c:1077 jfs_mount_rw+0xf2/0x5c0 fs/jfs/jfs_mount.c:253 jfs_fill_super+0x5bb/0xaf0 fs/jfs/super.c:570 mount_bdev+0x287/0x3c0 fs/super.c:1400 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3014 do_mount fs/namespace.c:3357 [inline] __do_sys_mount fs/namespace.c:3565 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3542 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 5479: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0xef/0x2a0 mm/slub.c:4559 lmLogClose+0x293/0x520 fs/jfs/jfs_logmgr.c:-1 jfs_umount+0x28f/0x360 fs/jfs/jfs_umount.c:116 jfs_put_super+0x88/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x300 fs/super.c:475 kill_block_super+0x7c/0xe0 fs/super.c:1427 deactivate_locked_super+0x93/0xf0 fs/super.c:335 cleanup_mnt+0x418/0x4d0 fs/namespace.c:1139 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x35/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348 kvfree_call_rcu+0x10a/0x7c0 kernel/rcu/tree.c:3600 neigh_del net/core/neighbour.c:197 [inline] neigh_remove_one+0x4e8/0x5f0 net/core/neighbour.c:218 neigh_forced_gc net/core/neighbour.c:251 [inline] neigh_alloc net/core/neighbour.c:429 [inline] ___neigh_create+0x468/0x2250 net/core/neighbour.c:591 ip6_finish_output2+0xa01/0x1500 net/ipv6/ip6_output.c:127 dst_output include/net/dst.h:452 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ndisc_send_skb+0xbea/0x14a0 net/ipv6/ndisc.c:513 ndisc_send_ns+0x63c/0x840 net/ipv6/ndisc.c:655 ndisc_solicit+0x2f8/0x4e0 net/ipv6/ndisc.c:747 neigh_probe net/core/neighbour.c:1017 [inline] __neigh_event_send+0xf12/0x14e0 net/core/neighbour.c:1178 neigh_event_send include/net/neighbour.h:438 [inline] neigh_resolve_output+0x1b3/0x6a0 net/core/neighbour.c:1488 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x1070/0x1500 net/ipv6/ip6_output.c:130 dst_output include/net/dst.h:452 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ip6_xmit+0x1054/0x1670 net/ipv6/ip6_output.c:338 inet6_csk_xmit+0x444/0x6d0 net/ipv6/inet6_connection_sock.c:135 __tcp_transmit_skb+0x1ced/0x31c0 net/ipv4/tcp_output.c:1404 tcp_transmit_skb net/ipv4/tcp_output.c:1422 [inline] tcp_connect+0x21a9/0x4970 net/ipv4/tcp_output.c:3893 tcp_v6_connect+0x1136/0x1920 net/ipv6/tcp_ipv6.c:337 __inet_stream_connect+0x293/0xdf0 net/ipv4/af_inet.c:672 inet_stream_connect+0x62/0xa0 net/ipv4/af_inet.c:736 mptcp_stream_connect+0x674/0x950 net/mptcp/protocol.c:3436 __sys_connect_file net/socket.c:1923 [inline] __sys_connect+0x389/0x410 net/socket.c:1940 __do_sys_connect net/socket.c:1950 [inline] __se_sys_connect net/socket.c:1947 [inline] __x64_sys_connect+0x76/0x80 net/socket.c:1947 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888022aec000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 544 bytes inside of 1024-byte region [ffff888022aec000, ffff888022aec400) The buggy address belongs to the page: page:ffffea00008aba00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22ae8 head:ffffea00008aba00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888016841dc0 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4192, ts 54828306427, free_ts 54771802719 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5474 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1975 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] __kmalloc_node+0x200/0x3b0 mm/slub.c:4451 kmalloc_node include/linux/slab.h:627 [inline] kzalloc_node include/linux/slab.h:746 [inline] qdisc_alloc+0x8d/0xb10 net/sched/sch_generic.c:888 qdisc_create_dflt+0x5f/0x430 net/sched/sch_generic.c:950 attach_one_default_qdisc net/sched/sch_generic.c:1113 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2379 [inline] attach_default_qdiscs net/sched/sch_generic.c:1131 [inline] dev_activate+0x331/0x12b0 net/sched/sch_generic.c:1190 __dev_open+0x32c/0x420 net/core/dev.c:1546 __dev_change_flags+0x20a/0x6a0 net/core/dev.c:8853 dev_change_flags+0x82/0x1a0 net/core/dev.c:8924 do_setlink+0xc01/0x3980 net/core/rtnetlink.c:2779 __rtnl_newlink net/core/rtnetlink.c:3450 [inline] rtnl_newlink+0x1419/0x17d0 net/core/rtnetlink.c:3572 rtnetlink_rcv_msg+0x9b9/0xe60 net/core/rtnetlink.c:5650 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 free_slab mm/slub.c:2015 [inline] discard_slab mm/slub.c:2021 [inline] __unfreeze_partials+0x1a5/0x200 mm/slub.c:2507 put_cpu_partial+0x12d/0x190 mm/slub.c:2587 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] kmem_cache_alloc_node+0x12d/0x2d0 mm/slub.c:3256 __alloc_skb+0xf4/0x750 net/core/skbuff.c:415 alloc_skb include/linux/skbuff.h:1162 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline] netlink_sendmsg+0x645/0xbc0 net/netlink/af_netlink.c:1893 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] __sys_sendto+0x423/0x580 net/socket.c:2063 __do_sys_sendto net/socket.c:2075 [inline] __se_sys_sendto net/socket.c:2071 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2071 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff888022aec100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022aec180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888022aec200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888022aec280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022aec300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================