... Log Wrap ... Log Wrap ... Log Wrap ... ================================================================== BUG: KASAN: use-after-free in lmLogSync+0x63c/0x88c fs/jfs/jfs_logmgr.c:1013 Write of size 4 at addr ffff0000d7429a20 by task jfsCommit/241 CPU: 0 PID: 241 Comm: jfsCommit Not tainted 5.15.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xec/0x15c mm/kasan/report.c:451 __asan_report_store4_noabort+0x44/0x50 mm/kasan/report_generic.c:313 lmLogSync+0x63c/0x88c fs/jfs/jfs_logmgr.c:1013 jfs_syncpt+0x70/0x94 fs/jfs/jfs_logmgr.c:1049 txEnd+0x294/0x510 fs/jfs/jfs_txnmgr.c:549 txLazyCommit fs/jfs/jfs_txnmgr.c:2718 [inline] jfs_lazycommit+0x4a4/0x9bc fs/jfs/jfs_txnmgr.c:2766 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Allocated by task 5654: 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+0xb0/0xf0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x274/0x3fc mm/slub.c:3247 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+0x288/0xd68 fs/jfs/jfs_logmgr.c:1077 jfs_mount_rw+0xe4/0x50c fs/jfs/jfs_mount.c:253 jfs_fill_super+0x49c/0x960 fs/jfs/super.c:570 mount_bdev+0x264/0x358 fs/super.c:1400 jfs_do_mount+0x44/0x58 fs/jfs/super.c:675 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611 vfs_get_tree+0x90/0x274 fs/super.c:1530 do_new_mount+0x228/0x810 fs/namespace.c:3012 path_mount+0x5b4/0x1000 fs/namespace.c:3342 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount fs/namespace.c:3540 [inline] __arm64_sys_mount+0x514/0x5e4 fs/namespace.c:3540 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Freed by task 4028: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0x170/0x40c mm/slub.c:4559 lmLogClose+0x250/0x4c8 fs/jfs/jfs_logmgr.c:-1 jfs_umount+0x244/0x328 fs/jfs/jfs_umount.c:116 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x2f0 fs/super.c:475 kill_block_super+0x70/0xdc fs/super.c:1427 deactivate_locked_super+0xb8/0x13c fs/super.c:335 deactivate_super+0xf8/0x118 fs/super.c:366 cleanup_mnt+0x3a4/0x458 fs/namespace.c:1143 __cleanup_mnt+0x20/0x30 fs/namespace.c:1150 task_work_run+0x12c/0x1e0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] do_notify_resume+0x24b4/0x3128 arch/arm64/kernel/signal.c:946 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_svc+0xf0/0x1e0 arch/arm64/kernel/entry-common.c:609 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xcc/0x114 mm/kasan/generic.c:348 kvfree_call_rcu+0xb8/0x66c kernel/rcu/tree.c:3596 neigh_destroy+0x464/0x6a8 net/core/neighbour.c:860 neigh_release include/net/neighbour.h:419 [inline] neigh_cleanup_and_release+0x140/0x348 net/core/neighbour.c:103 neigh_flush_dev+0x188/0x828 net/core/neighbour.c:374 __neigh_ifdown+0x54/0x348 net/core/neighbour.c:391 neigh_ifdown+0x2c/0x40 net/core/neighbour.c:408 rt6_disable_ip+0x5c4/0x658 net/ipv6/route.c:4922 addrconf_ifdown+0x148/0x1688 net/ipv6/addrconf.c:3778 addrconf_notify+0x2f4/0xc6c net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2049 [inline] call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] dev_close_many+0x2cc/0x440 net/core/dev.c:1650 unregister_netdevice_many+0x3d4/0x17d0 net/core/dev.c:11109 default_device_exit_batch+0x444/0x4a4 net/core/dev.c:11666 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x644/0xa14 net/core/net_namespace.c:618 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310 worker_thread+0x8f4/0x101c kernel/workqueue.c:2457 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 The buggy address belongs to the object at ffff0000d7429800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 544 bytes inside of 1024-byte region [ffff0000d7429800, ffff0000d7429c00) The buggy address belongs to the page: page:0000000092e9d031 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117428 head:0000000092e9d031 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002780 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d7429900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d7429980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d7429a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d7429a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d7429b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================