================================================================== BUG: KASAN: double-free in kfree+0xb8/0x19c mm/slab_common.c:1034 Free of addr ffff00012c7b0000 by task syz-executor.5/6040 CPU: 1 PID: 6040 Comm: syz-executor.5 Not tainted 6.5.0-rc7-syzkaller-gfe4469582053 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x174/0x514 mm/kasan/report.c:475 kasan_report_invalid_free+0xc4/0x118 mm/kasan/report.c:550 ____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:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook mm/slub.c:1818 [inline] slab_free mm/slub.c:3801 [inline] __kmem_cache_free+0x2ac/0x480 mm/slub.c:3814 kfree+0xb8/0x19c mm/slab_common.c:1034 diUnmount+0xf4/0x10c fs/jfs/jfs_imap.c:195 jfs_umount+0x15c/0x360 fs/jfs/jfs_umount.c:63 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x328 fs/super.c:499 kill_block_super+0x60/0xa0 fs/super.c:1417 deactivate_locked_super+0xac/0x124 fs/super.c:330 deactivate_super+0xe0/0x100 fs/super.c:361 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1254 __cleanup_mnt+0x20/0x30 fs/namespace.c:1261 task_work_run+0x230/0x2e0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2180/0x3c90 arch/arm64/kernel/signal.c:1305 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline] el0_svc+0xa0/0x16c arch/arm64/kernel/entry-common.c:679 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Allocated by task 6040: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:511 __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x90/0x4a0 mm/slab.h:762 slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x29c/0x424 mm/slub.c:3494 getname_flags+0xd0/0x480 fs/namei.c:140 user_path_at_empty+0x40/0x1a4 fs/namei.c:2906 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1914 [inline] __do_sys_umount fs/namespace.c:1922 [inline] __se_sys_umount fs/namespace.c:1920 [inline] __arm64_sys_umount+0xf8/0x17c fs/namespace.c:1920 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Freed by task 6040: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:522 ____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:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook mm/slub.c:1818 [inline] slab_free mm/slub.c:3801 [inline] kmem_cache_free+0x2e4/0x56c mm/slub.c:3823 putname fs/namei.c:273 [inline] user_path_at_empty+0x148/0x1a4 fs/namei.c:2909 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1914 [inline] __do_sys_umount fs/namespace.c:1922 [inline] __se_sys_umount fs/namespace.c:1920 [inline] __arm64_sys_umount+0xf8/0x17c fs/namespace.c:1920 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the object at ffff00012c7b0000 which belongs to the cache names_cache of size 4096 The buggy address is located 0 bytes inside of 4096-byte region [ffff00012c7b0000, ffff00012c7b1000) The buggy address belongs to the physical page: page:00000000bb5e7fe3 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16c7b0 head:00000000bb5e7fe3 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000010200 ffff0000c185d8c0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00012c7aff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff00012c7aff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff00012c7b0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff00012c7b0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00012c7b0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6040 at mm/slab_common.c:953 free_large_kmalloc+0x34/0x12c mm/slab_common.c:954 Modules linked in: CPU: 1 PID: 6040 Comm: syz-executor.5 Tainted: G B 6.5.0-rc7-syzkaller-gfe4469582053 #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+0x34/0x12c mm/slab_common.c:954 lr : kfree+0xf8/0x19c mm/slab_common.c:1028 sp : ffff800097687700 x29: ffff800097687700 x28: ffff000132778430 x27: ffff000132778d70 x26: ffff0000cb70e828 x25: ffff0000cb70e820 x24: 0000000000000000 x23: ffff00013277ce30 x22: dfff800000000000 x21: ffff800080841de0 x20: ffff0000d18d8000 x19: fffffc0003463600 x18: 1fffe0003683f1c6 x17: ffff80008e09d000 x16: ffff80008a572e30 x15: 000000000000000f x14: 1ffff00012ed0ec0 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000000 x9 : 05ffc00000000000 x8 : ffff800090d43000 x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : 0000000000000000 x3 : 0000000000000030 x2 : 0000000000000008 x1 : ffff0000d18d8000 x0 : fffffc0003463600 Call trace: free_large_kmalloc+0x34/0x12c mm/slab_common.c:954 kfree+0xf8/0x19c mm/slab_common.c:1028 diUnmount+0xf4/0x10c fs/jfs/jfs_imap.c:195 jfs_umount+0x15c/0x360 fs/jfs/jfs_umount.c:63 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x328 fs/super.c:499 kill_block_super+0x60/0xa0 fs/super.c:1417 deactivate_locked_super+0xac/0x124 fs/super.c:330 deactivate_super+0xe0/0x100 fs/super.c:361 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1254 __cleanup_mnt+0x20/0x30 fs/namespace.c:1261 task_work_run+0x230/0x2e0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2180/0x3c90 arch/arm64/kernel/signal.c:1305 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline] el0_svc+0xa0/0x16c arch/arm64/kernel/entry-common.c:679 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 irq event stamp: 3977141 hardirqs last enabled at (3977141): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1378 [inline] hardirqs last enabled at (3977141): [] finish_lock_switch+0xbc/0x1e4 kernel/sched/core.c:5133 hardirqs last disabled at (3977140): [] __schedule+0x2b4/0x23b4 kernel/sched/core.c:6609 softirqs last enabled at (3976650): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (3976648): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- object pointer: 0x0000000093b2d4df page:00000000d56ad487 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1118d8 head:00000000d56ad487 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000010200 ffff0000c185d8c0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: VM_BUG_ON_FOLIO(folio_test_slab(folio)) ------------[ cut here ]------------ kernel BUG at include/linux/memcontrol.h:380! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 6040 Comm: syz-executor.5 Tainted: G B W 6.5.0-rc7-syzkaller-gfe4469582053 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __folio_memcg include/linux/memcontrol.h:380 [inline] pc : folio_memcg+0x148/0x174 include/linux/memcontrol.h:433 lr : __folio_memcg include/linux/memcontrol.h:380 [inline] lr : folio_memcg+0x148/0x174 include/linux/memcontrol.h:433 sp : ffff800097687670 x29: ffff800097687670 x28: ffff000132778430 x27: ffff000132778d70 x26: ffff0000cb70e828 x25: ffff0000cb70e820 x24: dfff800000000000 x23: 1fffff800068c6c1 x22: dfff800000000000 x21: 0000000000000000 x20: fffffc0003463608 x19: fffffc0003463600 x18: 1fffe0003683f1c6 x17: 0000000000000000 x16: ffff80008a4bedb0 x15: 0000000000000001 x14: 1ffff00012ed0ddc x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : ffff0000cd8e0000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800097686ef8 x4 : ffff80008e17f000 x3 : ffff800080365c08 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000003c Call trace: __folio_memcg include/linux/memcontrol.h:380 [inline] folio_memcg+0x148/0x174 include/linux/memcontrol.h:433 page_memcg include/linux/memcontrol.h:438 [inline] __mod_lruvec_page_state+0x110/0x2ec mm/memcontrol.c:860 mod_lruvec_page_state include/linux/vmstat.h:568 [inline] free_large_kmalloc+0x98/0x12c mm/slab_common.c:960 kfree+0xf8/0x19c mm/slab_common.c:1028 diUnmount+0xf4/0x10c fs/jfs/jfs_imap.c:195 jfs_umount+0x15c/0x360 fs/jfs/jfs_umount.c:63 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x328 fs/super.c:499 kill_block_super+0x60/0xa0 fs/super.c:1417 deactivate_locked_super+0xac/0x124 fs/super.c:330 deactivate_super+0xe0/0x100 fs/super.c:361 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1254 __cleanup_mnt+0x20/0x30 fs/namespace.c:1261 task_work_run+0x230/0x2e0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2180/0x3c90 arch/arm64/kernel/signal.c:1305 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline] el0_svc+0xa0/0x16c arch/arm64/kernel/entry-common.c:679 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Code: f004ec61 912b8021 aa1303e0 97f990c8 (d4210000) ---[ end trace 0000000000000000 ]---