================================================================== BUG: KASAN: slab-use-after-free in lbmIODone+0xedc/0x1200 fs/jfs/jfs_logmgr.c:2184 Read of size 4 at addr ffff888015787808 by task ksoftirqd/0/15 CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.9.0-rc6-syzkaller-00046-g18daea77cca6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 lbmIODone+0xedc/0x1200 fs/jfs/jfs_logmgr.c:2184 bio_endio+0x5f0/0x700 block/bio.c:1603 req_bio_endio block/blk-mq.c:786 [inline] blk_update_request+0x693/0x1820 block/blk-mq.c:931 blk_mq_end_request+0x4f/0x90 block/blk-mq.c:1054 lo_complete_rq+0x232/0x2f0 drivers/block/loop.c:366 blk_complete_reqs+0xae/0xf0 block/blk-mq.c:1129 __do_softirq+0x218/0x922 kernel/softirq.c:554 run_ksoftirqd kernel/softirq.c:924 [inline] run_ksoftirqd+0x35/0x60 kernel/softirq.c:916 smpboot_thread_fn+0x661/0xa10 kernel/smpboot.c:164 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 8177: 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:628 [inline] lbmLogInit fs/jfs/jfs_logmgr.c:1822 [inline] lmLogInit+0x3ec/0x1a90 fs/jfs/jfs_logmgr.c:1270 open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline] lmLogOpen+0x7e1/0x1400 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+0x14e6/0x1f20 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] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 7010: 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:579 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:2106 [inline] slab_free mm/slub.c:4280 [inline] kfree+0x129/0x390 mm/slub.c:4390 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+0x14e/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:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xdc/0x260 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888015787800 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 8 bytes inside of freed 192-byte region [ffff888015787800, ffff8880157878c0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15787 anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888015041a00 0000000000000000 dead000000000001 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1265236090 (swapper/0), ts 1, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2175 [inline] allocate_slab mm/slub.c:2338 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2391 ___slab_alloc+0x66d/0x1790 mm/slub.c:3525 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3610 __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmalloc_trace+0x2fb/0x330 mm/slub.c:3992 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] call_usermodehelper_setup+0x9a/0x340 kernel/umh.c:363 kobject_uevent_env+0x14f1/0x1810 lib/kobject_uevent.c:613 device_add+0x111d/0x1ab0 drivers/base/core.c:3701 device_create_groups_vargs+0x1f8/0x270 drivers/base/core.c:4412 device_create+0xe9/0x130 drivers/base/core.c:4451 chr_dev_init+0xd4/0x170 drivers/char/mem.c:768 do_one_initcall+0x128/0x700 init/main.c:1245 do_initcall_level init/main.c:1307 [inline] do_initcalls init/main.c:1323 [inline] do_basic_setup init/main.c:1342 [inline] kernel_init_freeable+0x69d/0xca0 init/main.c:1555 kernel_init+0x1c/0x2b0 init/main.c:1444 page_owner free stack trace missing Memory state around the buggy address: ffff888015787700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888015787780: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888015787800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888015787880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888015787900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================