================================================================== BUG: KASAN: double-free in kfree+0xcc/0x1b8 mm/slab_common.c:1007 Free of addr ffff0000d9c58000 by task syz-executor.0/4580 CPU: 1 PID: 4580 Comm: syz-executor.0 Not tainted 6.1.53-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report_invalid_free+0xc4/0x114 mm/kasan/report.c:460 ____kasan_slab_free+0x170/0x1c0 mm/kasan/common.c:225 __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 mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:1007 diUnmount+0xf4/0x10c fs/jfs/jfs_imap.c:195 jfs_umount+0x110/0x338 fs/jfs/jfs_umount.c:63 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x328 fs/super.c:501 kill_block_super+0x70/0xdc fs/super.c:1459 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2144/0x3470 arch/arm64/kernel/signal.c:1132 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+0x9c/0x168 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:581 Allocated by task 4573: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x74/0x458 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x230/0x37c mm/slub.c:3422 getname_flags+0xd0/0x480 fs/namei.c:139 getname fs/namei.c:218 [inline] __do_sys_renameat fs/namei.c:4975 [inline] __se_sys_renameat fs/namei.c:4972 [inline] __arm64_sys_renameat+0xb0/0xe4 fs/namei.c:4972 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 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:581 Freed by task 4573: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 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 mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] kmem_cache_free+0x2f0/0x588 mm/slub.c:3683 putname fs/namei.c:271 [inline] do_renameat2+0xf20/0x1040 fs/namei.c:4961 __do_sys_renameat fs/namei.c:4975 [inline] __se_sys_renameat fs/namei.c:4972 [inline] __arm64_sys_renameat+0xc8/0xe4 fs/namei.c:4972 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 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:581 The buggy address belongs to the object at ffff0000d9c58000 which belongs to the cache names_cache of size 4096 The buggy address is located 0 bytes inside of 4096-byte region [ffff0000d9c58000, ffff0000d9c59000) The buggy address belongs to the physical page: page:000000002e0d5bf5 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x119c58 head:000000002e0d5bf5 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c03d6300 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d9c57f00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ffff0000d9c57f80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe >ffff0000d9c58000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d9c58080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d9c58100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ WARNING: CPU: 0 PID: 4580 at mm/slab_common.c:923 free_large_kmalloc+0x34/0x15c mm/slab_common.c:924 Modules linked in: CPU: 0 PID: 4580 Comm: syz-executor.0 Tainted: G B 6.1.53-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : free_large_kmalloc+0x34/0x15c mm/slab_common.c:924 lr : kfree+0x10c/0x1b8 mm/slab_common.c:1001 sp : ffff80001e1c77a0 x29: ffff80001e1c77a0 x28: ffff0000d167ba00 x27: dfff800000000000 x26: 1fffe0001a2cf745 x25: 0000000000000002 x24: ffff0000d167ba20 x23: ffff0000e23cc4f0 x22: dfff800000000000 x21: ffff800008810fd8 x20: ffff0000c3438000 x19: fffffc00030d0e00 x18: ffff80001e1c7634 x17: ffff8000158bd000 x16: ffff80001212b84c x15: 0000000000000000 x14: 00000000ffff8000 x13: ffff700003c38ec0 x12: 000000000000000f x11: ff80800008098054 x10: 0000000000000000 x9 : 00000000030d0e00 x8 : ffff8000181e1000 x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : 0000000000000000 x3 : 0000000000000030 x2 : 0000000000000008 x1 : ffff0000c3438000 x0 : fffffc00030d0e00 Call trace: free_large_kmalloc+0x34/0x15c mm/slab_common.c:924 kfree+0x10c/0x1b8 mm/slab_common.c:1001 diUnmount+0xf4/0x10c fs/jfs/jfs_imap.c:195 jfs_umount+0x110/0x338 fs/jfs/jfs_umount.c:63 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x328 fs/super.c:501 kill_block_super+0x70/0xdc fs/super.c:1459 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2144/0x3470 arch/arm64/kernel/signal.c:1132 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+0x9c/0x168 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:581 irq event stamp: 212359 hardirqs last enabled at (212359): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1366 [inline] hardirqs last enabled at (212359): [] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:5000 hardirqs last disabled at (212358): [] __schedule+0x2a4/0x1c98 kernel/sched/core.c:6453 softirqs last enabled at (211238): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (211236): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- object pointer: 0x00000000b57ac265 page:000000005de18b52 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103438 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 fffffc00030c5808 ffff0001b45862e0 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:765! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 4580 Comm: syz-executor.0 Tainted: G B W 6.1.53-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : put_page_testzero include/linux/mm.h:765 [inline] pc : __free_pages+0x15c/0x1cc mm/page_alloc.c:5647 lr : put_page_testzero include/linux/mm.h:765 [inline] lr : __free_pages+0x15c/0x1cc mm/page_alloc.c:5647 sp : ffff80001e1c7760 x29: ffff80001e1c7760 x28: ffff0000d167ba00 x27: dfff800000000000 x26: 1fffe0001a2cf745 x25: 0000000000000002 x24: ffff0000d167ba20 x23: dfff800000000000 x22: 05ffc00000000000 x21: fffffc00030d0e34 x20: 0000000000000000 x19: fffffc00030d0e00 x18: 1fffe000368a9b76 x17: 0000000000000000 x16: ffff80001212b84c x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001 x11: ff80800008834da0 x10: 0000000000000000 x9 : ffff800008834da0 x8 : ffff0000c8970000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001e1c6fd8 x4 : ffff8000159a2b20 x3 : ffff800008588964 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000003e Call trace: put_page_testzero include/linux/mm.h:765 [inline] __free_pages+0x15c/0x1cc mm/page_alloc.c:5647 free_large_kmalloc+0xd0/0x15c mm/slab_common.c:932 kfree+0x10c/0x1b8 mm/slab_common.c:1001 diUnmount+0xf4/0x10c fs/jfs/jfs_imap.c:195 jfs_umount+0x110/0x338 fs/jfs/jfs_umount.c:63 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x328 fs/super.c:501 kill_block_super+0x70/0xdc fs/super.c:1459 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2144/0x3470 arch/arm64/kernel/signal.c:1132 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+0x9c/0x168 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:581 Code: d004d301 91160021 aa1303e0 97fdd08b (d4210000) ---[ end trace 0000000000000000 ]---