================================================================== BUG: KASAN: slab-use-after-free in write_special_inodes fs/jfs/jfs_logmgr.c:200 [inline] BUG: KASAN: slab-use-after-free in jfs_flush_journal+0x8bc/0xf50 fs/jfs/jfs_logmgr.c:1570 Read of size 8 at addr ffff8880794c4c38 by task syz-executor/9414 CPU: 0 UID: 0 PID: 9414 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 write_special_inodes fs/jfs/jfs_logmgr.c:200 [inline] jfs_flush_journal+0x8bc/0xf50 fs/jfs/jfs_logmgr.c:1570 jfs_umount+0x150/0x3b0 fs/jfs/jfs_umount.c:59 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x13d/0x2d0 fs/super.c:751 kill_block_super+0x44/0xa0 fs/super.c:1914 deactivate_locked_super+0xbe/0x110 fs/super.c:586 cleanup_mnt+0x204/0x2a0 fs/namespace.c:1392 task_work_run+0x1d9/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f988499f417 Code: a2 c7 05 dc 62 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 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 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffea6175988 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f9884a34ccb RCX: 00007f988499f417 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffea6175a40 RBP: 00007ffea6175a40 R08: 00007ffea6176a40 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffea6176ad0 R13: 00007f9884a34ccb R14: 00000000000734cb R15: 00007ffea6176b10 Allocated by task 11150: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x31c/0x600 mm/slub.c:5680 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] jfs_fill_super+0xc2/0xda0 fs/jfs/super.c:452 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1883 vfs_get_tree+0x92/0x2a0 fs/super.c:1943 fc_mount fs/namespace.c:1278 [inline] do_new_mount_fc fs/namespace.c:3885 [inline] do_new_mount+0x325/0xb00 fs/namespace.c:3961 do_mount fs/namespace.c:4325 [inline] __do_sys_mount fs/namespace.c:4540 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4517 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6071: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2780 [inline] slab_free mm/slub.c:6630 [inline] kfree+0x1c5/0x650 mm/slub.c:6923 generic_shutdown_super+0x13d/0x2d0 fs/super.c:751 kill_block_super+0x44/0xa0 fs/super.c:1914 deactivate_locked_super+0xbe/0x110 fs/super.c:586 cleanup_mnt+0x204/0x2a0 fs/namespace.c:1392 task_work_run+0x1d9/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880794c4c00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 56 bytes inside of freed 256-byte region [ffff8880794c4c00, ffff8880794c4d00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x794c4 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801c041b40 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801c041b40 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 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 5605, tgid 5605 (syz-executor), ts 77174649401 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1854 prep_new_page mm/page_alloc.c:1862 [inline] get_page_from_freelist+0x220f/0x2280 mm/page_alloc.c:3933 __alloc_frozen_pages_noprof+0x1fc/0x400 mm/page_alloc.c:5477 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab+0x7d/0x5e0 mm/slub.c:3499 new_slab mm/slub.c:3550 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] __do_kmalloc_node mm/slub.c:5530 [inline] __kmalloc_noprof+0x476/0x710 mm/slub.c:5556 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] fib_create_info+0x16fe/0x3170 net/ipv4/fib_semantics.c:1432 fib_table_insert+0xcb/0x1b10 net/ipv4/fib_trie.c:1210 fib_magic+0x43b/0x530 net/ipv4/fib_frontend.c:1147 fib_add_ifaddr+0x139/0x5d0 net/ipv4/fib_frontend.c:1169 fib_inetaddr_event+0x12e/0x190 net/ipv4/fib_frontend.c:1483 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:86 blocking_notifier_call_chain+0x6a/0x90 kernel/notifier.c:485 __inet_insert_ifa+0x9ef/0xbc0 net/ipv4/devinet.c:556 inet_rtm_newaddr+0x1039/0x19f0 net/ipv4/devinet.c:991 page last free pid 15 tgid 15 ts 77148399058 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1401 [inline] __free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2952 rcu_do_batch kernel/rcu/tree.c:2650 [inline] rcu_core+0x92e/0x1230 kernel/rcu/tree.c:2919 handle_softirqs+0x223/0x840 kernel/softirq.c:645 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1099 smpboot_thread_fn+0x5f8/0xb30 kernel/smpboot.c:162 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff8880794c4b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880794c4b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880794c4c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880794c4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880794c4d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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