================================================================== BUG: KASAN: use-after-free in txEnd+0xe8/0x4f0 fs/jfs/jfs_txnmgr.c:506 Read of size 8 at addr ffff0000ed955430 by task jfsCommit/92 CPU: 0 PID: 92 Comm: jfsCommit Not tainted 6.1.147-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x200 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:418 kasan_report+0xa8/0x100 mm/kasan/report.c:522 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 txEnd+0xe8/0x4f0 fs/jfs/jfs_txnmgr.c:506 txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline] jfs_lazycommit+0x498/0x918 fs/jfs/jfs_txnmgr.c:2732 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:849 Allocated by task 6856: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] jfs_fill_super+0xdc/0x948 fs/jfs/super.c:495 mount_bdev+0x264/0x358 fs/super.c:1443 jfs_do_mount+0x44/0x58 fs/jfs/super.c:670 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3063 path_mount+0x5b4/0xe78 fs/namespace.c:3393 do_mount fs/namespace.c:3406 [inline] __do_sys_mount fs/namespace.c:3614 [inline] __se_sys_mount fs/namespace.c:3591 [inline] __arm64_sys_mount+0x49c/0x584 fs/namespace.c:3591 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 4324: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x3c/0x60 mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x16c/0x1ec mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xc0/0x224 mm/slub.c:3674 kfree+0xd0/0x1ac mm/slab_common.c:988 jfs_put_super+0x144/0x188 fs/jfs/super.c:203 generic_shutdown_super+0x130/0x324 fs/super.c:501 kill_block_super+0x70/0xdc fs/super.c:1470 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xe8/0x108 fs/super.c:363 cleanup_mnt+0x37c/0x404 fs/namespace.c:1182 __cleanup_mnt+0x20/0x30 fs/namespace.c:1189 task_work_run+0x1ec/0x270 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x1f70/0x2b0c arch/arm64/kernel/signal.c:1137 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0x100/0x954 kernel/rcu/tree.c:2849 vlan_vid_del+0x530/0x610 net/8021q/vlan_core.c:390 vlan_vid0_del net/8021q/vlan.c:387 [inline] vlan_device_event+0x320/0x1970 net/8021q/vlan.c:414 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:2001 [inline] call_netdevice_notifiers_extack net/core/dev.c:2039 [inline] call_netdevice_notifiers net/core/dev.c:2053 [inline] dev_close_many+0x2cc/0x440 net/core/dev.c:1601 unregister_netdevice_many+0x3c4/0x1740 net/core/dev.c:10952 default_device_exit_batch+0x9a8/0xa40 net/core/dev.c:11491 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x644/0xa74 net/core/net_namespace.c:640 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:849 The buggy address belongs to the object at ffff0000ed955400 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 48 bytes inside of 256-byte region [ffff0000ed955400, ffff0000ed955500) The buggy address belongs to the physical page: page:0000000053ae9e3a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12d954 head:0000000053ae9e3a order:1 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003021900 dead000000000003 ffff0000c0002480 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000ed955300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000ed955380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000ed955400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000ed955480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000ed955500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== Unable to handle kernel paging request at virtual address dfff800000000029 KASAN: null-ptr-deref in range [0x0000000000000148-0x000000000000014f] Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 [dfff800000000029] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 92 Comm: jfsCommit Tainted: G B 6.1.147-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2025 pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : txEnd+0x180/0x4f0 fs/jfs/jfs_txnmgr.c:539 lr : txEnd+0x158/0x4f0 fs/jfs/jfs_txnmgr.c:528 sp : ffff80001ce97cc0 x29: ffff80001ce97cc0 x28: 1ffff00003fa5222 x27: ffff800015666000 x26: 1ffff00002accde0 x25: dfff800000000000 x24: ffff80001c45b000 x23: 0000000000000002 x22: 000000000000014c x21: ffff80001fd29138 x20: 0000000000000001 x19: 0000000000000000 x18: ffff800011aabce0 x17: 0000000000000000 x16: ffff800008042c60 x15: 0000000000000000 x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000ff0100 x11: ff0080000989d2c0 x10: 0000000000000000 x9 : 0000000000000029 x8 : 0000000000000001 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001ce97698 x4 : ffff800015194800 x3 : ffff800008191788 x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: txEnd+0x180/0x4f0 fs/jfs/jfs_txnmgr.c:534 txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline] jfs_lazycommit+0x498/0x918 fs/jfs/jfs_txnmgr.c:2732 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:849 Code: 12003e88 790002b7 d343fec9 b9006308 (38f96928) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 12003e88 and w8, w20, #0xffff 4: 790002b7 strh w23, [x21] 8: d343fec9 lsr x9, x22, #3 c: b9006308 str w8, [x24, #96] * 10: 38f96928 ldrsb w8, [x9, x25] <-- trapping instruction