================================================================== BUG: KASAN: slab-use-after-free in jfs_lazycommit+0xa29/0xb20 fs/jfs/jfs_txnmgr.c:2736 Read of size 4 at addr ffff88802417f294 by task jfsCommit/111 CPU: 1 UID: 0 PID: 111 Comm: jfsCommit Not tainted 6.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 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 jfs_lazycommit+0xa29/0xb20 fs/jfs/jfs_txnmgr.c:2736 kthread+0x2c4/0x3a0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 14173: 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:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] jfs_fill_super+0xe5/0xd20 fs/jfs/super.c:495 mount_bdev+0x1e6/0x2d0 fs/super.c:1679 legacy_get_tree+0x10c/0x220 fs/fs_context.c:662 vfs_get_tree+0x92/0x380 fs/super.c:1800 do_new_mount fs/namespace.c:3507 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount fs/namespace.c:4032 [inline] __x64_sys_mount+0x294/0x320 fs/namespace.c:4032 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 13140: 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:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x14f/0x4b0 mm/slub.c:4727 generic_shutdown_super+0x15f/0x3d0 fs/super.c:642 kill_block_super+0x3b/0x90 fs/super.c:1696 deactivate_locked_super+0xc1/0x1a0 fs/super.c:473 deactivate_super+0xde/0x100 fs/super.c:506 cleanup_mnt+0x222/0x450 fs/namespace.c:1373 task_work_run+0x151/0x250 kernel/task_work.c:239 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+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802417f200 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 148 bytes inside of freed 256-byte region [ffff88802417f200, ffff88802417f300) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2417e head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b041b40 ffffea0001e1d600 dead000000000003 raw: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801b041b40 ffffea0001e1d600 dead000000000003 head: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000 head: 00fff00000000001 ffffea0000905f81 ffffffffffffffff 0000000000000000 head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000 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 5234, tgid 5234 (syz-executor), ts 86665892710, free_ts 86645624071 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x101e/0x3070 mm/page_alloc.c:3457 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2412 [inline] allocate_slab mm/slub.c:2578 [inline] new_slab+0x2ba/0x3f0 mm/slub.c:2631 ___slab_alloc+0xdac/0x1880 mm/slub.c:3818 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] __kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4290 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] ____ip_mc_inc_group+0x273/0xcf0 net/ipv4/igmp.c:1452 __ip_mc_inc_group net/ipv4/igmp.c:1487 [inline] ip_mc_inc_group net/ipv4/igmp.c:1493 [inline] ip_mc_up+0x154/0x3b0 net/ipv4/igmp.c:1792 inetdev_event+0xab7/0x1830 net/ipv4/devinet.c:1618 notifier_call_chain+0xbc/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] __dev_notify_flags+0x12d/0x2e0 net/core/dev.c:8880 dev_change_flags+0x10c/0x160 net/core/dev.c:8918 do_setlink+0x1b0e/0x41c0 net/core/rtnetlink.c:2929 page last free pid 5236 tgid 5236 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0x5f4/0xdc0 mm/page_alloc.c:2638 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4141 fib_table_insert+0x80d/0x1d70 net/ipv4/fib_trie.c:1363 fib_magic+0x4d6/0x5c0 net/ipv4/fib_frontend.c:1104 fib_add_ifaddr+0x4c0/0x560 net/ipv4/fib_frontend.c:1148 fib_netdev_event+0x38a/0x710 net/ipv4/fib_frontend.c:1486 notifier_call_chain+0xbc/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] __dev_notify_flags+0x12d/0x2e0 net/core/dev.c:8880 dev_change_flags+0x10c/0x160 net/core/dev.c:8918 do_setlink+0x1b0e/0x41c0 net/core/rtnetlink.c:2929 __rtnl_newlink+0xc35/0x1920 net/core/rtnetlink.c:3725 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3772 Memory state around the buggy address: ffff88802417f180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802417f200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802417f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802417f300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802417f380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================