================================================================== BUG: KASAN: slab-use-after-free in lbmIODone+0xed4/0x11f0 fs/jfs/jfs_logmgr.c:2179 Read of size 4 at addr ffff88801c6eb608 by task ksoftirqd/1/21 CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 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 lbmIODone+0xed4/0x11f0 fs/jfs/jfs_logmgr.c:2179 bio_endio+0x593/0x6a0 block/bio.c:1603 req_bio_endio block/blk-mq.c:783 [inline] blk_update_request+0x67b/0x1780 block/blk-mq.c:928 blk_mq_end_request+0x57/0x520 block/blk-mq.c:1051 lo_complete_rq+0x232/0x2f0 drivers/block/loop.c:370 blk_complete_reqs+0xb2/0xf0 block/blk-mq.c:1131 __do_softirq+0x218/0x965 kernel/softirq.c:553 run_ksoftirqd kernel/softirq.c:921 [inline] run_ksoftirqd+0x31/0x60 kernel/softirq.c:913 smpboot_thread_fn+0x660/0xa00 kernel/smpboot.c:164 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Allocated by task 21309: 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+0xa3/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:599 [inline] lbmLogInit fs/jfs/jfs_logmgr.c:1822 [inline] lmLogInit+0x3ec/0x1a80 fs/jfs/jfs_logmgr.c:1270 open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline] lmLogOpen+0x7d9/0x13f0 fs/jfs/jfs_logmgr.c:1069 jfs_mount_rw+0x2ea/0x6f0 fs/jfs/jfs_mount.c:257 jfs_fill_super+0x9d2/0xd20 fs/jfs/super.c:565 mount_bdev+0x1f3/0x2e0 fs/super.c:1629 legacy_get_tree+0x109/0x220 fs/fs_context.c:638 vfs_get_tree+0x8c/0x370 fs/super.c:1750 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 5073: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x138/0x190 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] __cache_free mm/slab.c:3370 [inline] __do_kmem_cache_free mm/slab.c:3557 [inline] __kmem_cache_free+0xcc/0x2d0 mm/slab.c:3564 lbmLogShutdown fs/jfs/jfs_logmgr.c:1865 [inline] lmLogShutdown+0x379/0x780 fs/jfs/jfs_logmgr.c:1684 lmLogClose+0x57a/0x710 fs/jfs/jfs_logmgr.c:1460 jfs_umount+0x2f0/0x430 fs/jfs/jfs_umount.c:114 jfs_put_super+0x88/0x1d0 fs/jfs/super.c:194 generic_shutdown_super+0x161/0x3c0 fs/super.c:693 kill_block_super+0x3b/0x70 fs/super.c:1646 deactivate_locked_super+0x9a/0x170 fs/super.c:481 deactivate_super+0xde/0x100 fs/super.c:514 cleanup_mnt+0x222/0x3d0 fs/namespace.c:1254 task_work_run+0x14d/0x240 kernel/task_work.c:180 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+0x215/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88801c6eb600 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 8 bytes inside of freed 192-byte region [ffff88801c6eb600, ffff88801c6eb6c0) The buggy address belongs to the physical page: page:ffffea000071bac0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c6eb flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x10() raw: 00fff00000000800 ffff888012c40000 ffffea00009c8b90 ffffea0000ac1290 raw: 0000000000000000 ffff88801c6eb000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x342040(__GFP_IO|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 18971, tgid 18971 (syz-executor.3), ts 1234997689221, free_ts 1234157335860 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0xee0/0x2f20 mm/page_alloc.c:3170 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4426 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1356 [inline] cache_grow_begin+0x99/0x3a0 mm/slab.c:2550 cache_alloc_refill+0x294/0x3a0 mm/slab.c:2923 ____cache_alloc mm/slab.c:2999 [inline] ____cache_alloc mm/slab.c:2982 [inline] __do_cache_alloc mm/slab.c:3185 [inline] slab_alloc_node mm/slab.c:3230 [inline] __kmem_cache_alloc_node+0x38a/0x470 mm/slab.c:3521 __do_kmalloc_node mm/slab_common.c:1022 [inline] __kmalloc_node+0x52/0x110 mm/slab_common.c:1030 kmalloc_array_node include/linux/slab.h:697 [inline] kcalloc_node include/linux/slab.h:702 [inline] memcg_alloc_slab_cgroups+0x10e/0x200 mm/memcontrol.c:2895 memcg_slab_post_alloc_hook+0xa9/0x350 mm/slab.h:530 slab_post_alloc_hook mm/slab.h:770 [inline] slab_alloc_node mm/slab.c:3237 [inline] slab_alloc mm/slab.c:3246 [inline] __kmem_cache_alloc_lru mm/slab.c:3423 [inline] kmem_cache_alloc+0x18d/0x400 mm/slab.c:3432 kmem_cache_zalloc include/linux/slab.h:710 [inline] alloc_buffer_head+0x21/0x140 fs/buffer.c:3023 folio_alloc_buffers+0x2e7/0x7f0 fs/buffer.c:935 folio_create_empty_buffers+0x36/0x470 fs/buffer.c:1648 ext4_block_write_begin+0xcc4/0xf10 fs/ext4/inode.c:1024 ext4_da_write_begin+0x40a/0x8c0 fs/ext4/inode.c:2890 generic_perform_write+0x278/0x600 mm/filemap.c:3969 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1136 [inline] free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2312 free_unref_page_list+0xe6/0xb30 mm/page_alloc.c:2451 release_pages+0x32a/0x14e0 mm/swap.c:1042 __folio_batch_release+0x77/0xe0 mm/swap.c:1062 folio_batch_release include/linux/pagevec.h:83 [inline] mapping_try_invalidate+0x39a/0x480 mm/truncate.c:535 invalidate_bdev+0xb1/0xd0 block/bdev.c:87 ext4_put_super+0x535/0xdc0 fs/ext4/super.c:1353 generic_shutdown_super+0x161/0x3c0 fs/super.c:693 kill_block_super+0x3b/0x70 fs/super.c:1646 ext4_kill_sb+0x6a/0xb0 fs/ext4/super.c:7305 deactivate_locked_super+0x9a/0x170 fs/super.c:481 deactivate_super+0xde/0x100 fs/super.c:514 cleanup_mnt+0x222/0x3d0 fs/namespace.c:1254 task_work_run+0x14d/0x240 kernel/task_work.c:180 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+0x215/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296 Memory state around the buggy address: ffff88801c6eb500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801c6eb580: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801c6eb600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801c6eb680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801c6eb700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================