================================================================== BUG: KASAN: slab-use-after-free in lbmIODone+0xed4/0x11f0 fs/jfs/jfs_logmgr.c:2184 Read of size 4 at addr ffff888011bfe808 by task ksoftirqd/0/16 CPU: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.8.0-rc7-syzkaller-00020-g5847c9777c30 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 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:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 lbmIODone+0xed4/0x11f0 fs/jfs/jfs_logmgr.c:2184 bio_endio+0x59c/0x6b0 block/bio.c:1608 req_bio_endio block/blk-mq.c:792 [inline] blk_update_request+0x635/0x1710 block/blk-mq.c:937 blk_mq_end_request+0x4f/0x90 block/blk-mq.c:1060 lo_complete_rq+0x232/0x2f0 drivers/block/loop.c:366 blk_complete_reqs+0xae/0xf0 block/blk-mq.c:1135 __do_softirq+0x21c/0x8e7 kernel/softirq.c:553 run_ksoftirqd kernel/softirq.c:921 [inline] run_ksoftirqd+0x35/0x60 kernel/softirq.c:913 smpboot_thread_fn+0x669/0xa20 kernel/smpboot.c:164 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 14918: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc include/linux/slab.h:590 [inline] lbmLogInit fs/jfs/jfs_logmgr.c:1822 [inline] lmLogInit+0x3ec/0x1a40 fs/jfs/jfs_logmgr.c:1270 open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline] lmLogOpen+0x7ef/0x1410 fs/jfs/jfs_logmgr.c:1069 jfs_mount_rw+0x2ea/0x700 fs/jfs/jfs_mount.c:257 jfs_fill_super+0x9d6/0xd20 fs/jfs/super.c:565 mount_bdev+0x1e3/0x2d0 fs/super.c:1658 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1779 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e2/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 Freed by task 5208: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:589 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x124/0x370 mm/slub.c:4409 lbmLogShutdown fs/jfs/jfs_logmgr.c:1865 [inline] lmLogShutdown+0x379/0x780 fs/jfs/jfs_logmgr.c:1684 lmLogClose+0x57b/0x710 fs/jfs/jfs_logmgr.c:1460 jfs_umount+0x2f0/0x440 fs/jfs/jfs_umount.c:114 jfs_put_super+0x88/0x1d0 fs/jfs/super.c:194 generic_shutdown_super+0x159/0x3d0 fs/super.c:641 kill_block_super+0x3b/0x90 fs/super.c:1675 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472 deactivate_super+0xde/0x100 fs/super.c:505 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14f/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:108 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:212 __do_fast_syscall_32+0x8c/0x120 arch/x86/entry/common.c:324 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 The buggy address belongs to the object at ffff888011bfe800 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 8 bytes inside of freed 192-byte region [ffff888011bfe800, ffff888011bfe8c0) The buggy address belongs to the physical page: page:ffffea000046ff80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11bfe flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888014c42a00 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000001ffffffff 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 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 6951, tgid 6951 (syz-executor.1), ts 188728317907, free_ts 188726727662 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311 __alloc_pages_slowpath mm/page_alloc.c:4101 [inline] __alloc_pages+0x692/0x2440 mm/page_alloc.c:4580 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2190 [inline] allocate_slab mm/slub.c:2354 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2407 ___slab_alloc+0x4b0/0x1780 mm/slub.c:3540 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3625 __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc_node+0x361/0x470 mm/slub.c:3988 kmalloc_array_node include/linux/slab.h:688 [inline] kcalloc_node include/linux/slab.h:693 [inline] memcg_alloc_slab_cgroups+0xa9/0x180 mm/memcontrol.c:3014 __memcg_slab_post_alloc_hook+0xa3/0x370 mm/slub.c:1970 memcg_slab_post_alloc_hook mm/slub.c:1993 [inline] slab_post_alloc_hook mm/slub.c:3822 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x314/0x320 mm/slub.c:3867 kmem_cache_zalloc include/linux/slab.h:701 [inline] alloc_buffer_head+0x21/0x140 fs/buffer.c:2997 folio_alloc_buffers+0x2c8/0x7d0 fs/buffer.c:924 create_empty_buffers+0x36/0x480 fs/buffer.c:1650 ext4_block_write_begin+0xccd/0xef0 fs/ext4/inode.c:1038 ext4_da_write_begin+0x40e/0x8c0 fs/ext4/inode.c:2894 generic_perform_write+0x273/0x620 mm/filemap.c:3930 page last free pid 6981 tgid 6981 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2346 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486 tlb_batch_list_free mm/mmu_gather.c:114 [inline] tlb_finish_mmu+0x1a7/0x700 mm/mmu_gather.c:395 exit_mmap+0x3da/0xb50 mm/mmap.c:3292 __mmput+0x12a/0x4d0 kernel/fork.c:1343 mmput+0x62/0x70 kernel/fork.c:1365 exit_mm kernel/exit.c:569 [inline] do_exit+0x9a5/0x2ad0 kernel/exit.c:858 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020 __do_sys_exit_group kernel/exit.c:1031 [inline] __se_sys_exit_group kernel/exit.c:1029 [inline] __ia32_sys_exit_group+0x3e/0x50 kernel/exit.c:1029 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 Memory state around the buggy address: ffff888011bfe700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888011bfe780: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffff888011bfe800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888011bfe880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888011bfe900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================