R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeb75c1fb0
R13: 00007f2a8303d2ca R14: 000055558038c4e8 R15: 00007ffeb75c3080
---[ end trace d9735f8e816078ea ]---
==================================================================
BUG: KASAN: use-after-free in fast_dput+0x1e0/0x290 fs/dcache.c:750
Read of size 4 at addr ffff88811bfb9660 by task syz-executor/288

CPU: 1 PID: 288 Comm: syz-executor Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x100/0x140 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 fast_dput+0x1e0/0x290 fs/dcache.c:750
 dput+0x21/0x80 fs/dcache.c:870
 incfs_free_mount_info+0x60/0x200 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1a1/0x200 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1123
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa7c/0x24e0 kernel/exit.c:873
 do_group_exit+0x149/0x310 kernel/exit.c:987
 __do_sys_exit_group kernel/exit.c:998 [inline]
 __se_sys_exit_group kernel/exit.c:996 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:996
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f2a82fa7e59
Code: Unable to access opcode bytes at RIP 0x7f2a82fa7e2f.
RSP: 002b:00007ffeb75c0cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f2a8303d32a RCX: 00007f2a82fa7e59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 0000000000000000 R09: 00007f2a8303d2ca
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeb75c1fb0
R13: 00007f2a8303d2ca R14: 000055558038c4e8 R15: 00007ffeb75c3080

Allocated by task 409:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:430 [inline]
 __kasan_slab_alloc+0xb7/0xe0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580
 slab_alloc_node mm/slub.c:2952 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x15a/0x2d0 mm/slub.c:2965
 __d_alloc+0x2d/0x690 fs/dcache.c:1714
 d_alloc fs/dcache.c:1793 [inline]
 d_alloc_parallel+0xe2/0x1390 fs/dcache.c:2549
 __lookup_slow+0x14c/0x410 fs/namei.c:1633
 lookup_one_len+0x196/0x2d0 fs/namei.c:2664
 incfs_lookup_dentry+0x60/0xb0 fs/incfs/data_mgmt.c:210
 open_or_create_special_dir+0x4c/0x1e0 fs/incfs/vfs.c:469
 incfs_mount_fs+0x434/0x8d0 fs/incfs/vfs.c:1867
 legacy_get_tree+0xed/0x190 fs/fs_context.c:593
 vfs_get_tree+0x89/0x260 fs/super.c:1572
 do_new_mount+0x25a/0xa30 fs/namespace.c:3006
 path_mount+0x581/0xca0 fs/namespace.c:3336
 do_mount fs/namespace.c:3349 [inline]
 __do_sys_mount fs/namespace.c:3557 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3534
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 19:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1600 [inline]
 slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626
 slab_free mm/slub.c:3208 [inline]
 kmem_cache_free+0x100/0x2d0 mm/slub.c:3224
 __d_free+0x23/0x30 fs/dcache.c:271
 rcu_do_batch+0x488/0xaf0 kernel/rcu/tree.c:2494
 rcu_core+0x50a/0xca0 kernel/rcu/tree.c:2735
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748
 __do_softirq+0x255/0x563 kernel/softirq.c:309

Last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 __call_rcu kernel/rcu/tree.c:2980 [inline]
 call_rcu+0x11a/0x1090 kernel/rcu/tree.c:3054
 dentry_free+0xbd/0x150 fs/dcache.c:-1
 __dentry_kill+0x516/0x660 fs/dcache.c:597
 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1
 dput+0x42/0x80 fs/dcache.c:883
 incfs_free_mount_info+0x60/0x200 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1a1/0x200 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1123
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa7c/0x24e0 kernel/exit.c:873
 do_group_exit+0x149/0x310 kernel/exit.c:987
 __do_sys_exit_group kernel/exit.c:998 [inline]
 __se_sys_exit_group kernel/exit.c:996 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:996
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88811bfb9660
 which belongs to the cache dentry of size 208
The buggy address is located 0 bytes inside of
 208-byte region [ffff88811bfb9660, ffff88811bfb9730)
The buggy address belongs to the page:
page:ffffea00046fee40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11bfb9
flags: 0x4000000000000200(slab)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff88810018a900
raw: 0000000000000000 00000000000f000f 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112cd0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_RECLAIMABLE), pid 288, ts 25374877176, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x176/0x190 mm/page_alloc.c:2462
 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1813 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1874
 new_slab_objects mm/slub.c:2632 [inline]
 ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796
 __slab_alloc+0x63/0xa0 mm/slub.c:2836
 slab_alloc_node mm/slub.c:2918 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x1a4/0x2d0 mm/slub.c:2965
 __d_alloc+0x2d/0x690 fs/dcache.c:1714
 d_alloc_pseudo+0x1d/0x70 fs/dcache.c:1845
 alloc_file_pseudo+0xe0/0x200 fs/file_table.c:226
 sock_alloc_file+0xba/0x260 net/socket.c:412
 sock_map_fd net/socket.c:436 [inline]
 __sys_socket+0x12b/0x190 net/socket.c:1533
 __do_sys_socket net/socket.c:1538 [inline]
 __se_sys_socket net/socket.c:1536 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1536
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811bfb9500: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb
 ffff88811bfb9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88811bfb9600: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb
                                                       ^
 ffff88811bfb9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811bfb9700: fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00
==================================================================
------------[ cut here ]------------
WARNING: CPU: 0 PID: 288 at fs/dcache.c:766 fast_dput+0x207/0x290 fs/dcache.c:766
Modules linked in:
CPU: 0 PID: 288 Comm: syz-executor Tainted: G    B   W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:fast_dput+0x207/0x290 fs/dcache.c:766
Code: e1 f2 ff e9 4e fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c a1 fe ff ff 48 89 df e8 03 e1 f2 ff e9 94 fe ff ff e8 79 6a b8 ff <0f> 0b e9 13 ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c ec fe ff
RSP: 0018:ffffc90000c77ba0 EFLAGS: 00010293
RAX: ffffffff81ac3787 RBX: ffff88811bfb9660 RCX: ffff8881268d0000
RDX: 0000000000000000 RSI: 00000000ffffff80 RDI: 0000000000000001
RBP: ffffc90000c77bc8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200018ef64 R12: 00000000ffffff80
R13: dffffc0000000000 R14: ffff88811bfb96b8 R15: 1ffff110237f72d7
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4be283c990 CR3: 000000010cce4000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 dput+0x21/0x80 fs/dcache.c:870
 incfs_free_mount_info+0x60/0x200 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1a1/0x200 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1123
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa7c/0x24e0 kernel/exit.c:873
 do_group_exit+0x149/0x310 kernel/exit.c:987
 __do_sys_exit_group kernel/exit.c:998 [inline]
 __se_sys_exit_group kernel/exit.c:996 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:996
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f2a82fa7e59
Code: Unable to access opcode bytes at RIP 0x7f2a82fa7e2f.
RSP: 002b:00007ffeb75c0cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f2a8303d32a RCX: 00007f2a82fa7e59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 0000000000000000 R09: 00007f2a8303d2ca
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeb75c1fb0
R13: 00007f2a8303d2ca R14: 000055558038c4e8 R15: 00007ffeb75c3080
---[ end trace d9735f8e816078eb ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 288 at fs/dcache.c:641 retain_dentry+0x158/0x2a0 fs/dcache.c:641
Modules linked in:
CPU: 0 PID: 288 Comm: syz-executor Tainted: G    B   W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:retain_dentry+0x158/0x2a0 fs/dcache.c:641
Code: 31 ff e8 6b 6c b8 ff 44 89 e8 83 e0 40 0f 84 a5 00 00 00 e8 aa 68 b8 ff b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 98 68 b8 ff <0f> 0b e9 f9 fe ff ff e8 8c 68 b8 ff 31 c0 eb e0 e8 83 68 b8 ff 31
RSP: 0018:ffffc90000c77ba0 EFLAGS: 00010293
RAX: ffffffff81ac3968 RBX: ffff88811bfb9550 RCX: ffff8881268d0000
RDX: 0000000000000000 RSI: 0000000010000000 RDI: 0000000000000000
RBP: ffffc90000c77bc8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200018ef5c R12: 1ffff110237f72aa
R13: ffff88811209d3c8 R14: 0000000010000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4be283c990 CR3: 000000010cce4000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 dput+0x36/0x80 fs/dcache.c:878
 incfs_free_mount_info+0x80/0x200 fs/incfs/data_mgmt.c:167
 incfs_kill_sb+0x1a1/0x200 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1123
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa7c/0x24e0 kernel/exit.c:873
 do_group_exit+0x149/0x310 kernel/exit.c:987
 __do_sys_exit_group kernel/exit.c:998 [inline]
 __se_sys_exit_group kernel/exit.c:996 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:996
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f2a82fa7e59
Code: Unable to access opcode bytes at RIP 0x7f2a82fa7e2f.
RSP: 002b:00007ffeb75c0cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f2a8303d32a RCX: 00007f2a82fa7e59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 0000000000000000 R09: 00007f2a8303d2ca
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeb75c1fb0
R13: 00007f2a8303d2ca R14: 000055558038c4e8 R15: 00007ffeb75c3080
---[ end trace d9735f8e816078ec ]---
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 288 Comm: syz-executor Tainted: G    B   W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc90000c77b40 EFLAGS: 00010246
RAX: 1ffffffff0a52a2f RBX: ffff88811bfb9550 RCX: ffffffff81ac4b27
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811bfb9550
RBP: ffffc90000c77b88 R08: 0000000000000003 R09: 00000000fffffffb
R10: dffffc0000000000 R11: ffffed10237f72b5 R12: 1ffff110237f72aa
R13: dffffc0000000000 R14: ffffffff85295178 R15: ffff88811bfb95a8
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000010cce4000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __dentry_kill+0xca/0x660 fs/dcache.c:571
 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1
 dput+0x42/0x80 fs/dcache.c:883
 incfs_free_mount_info+0x80/0x200 fs/incfs/data_mgmt.c:167
 incfs_kill_sb+0x1a1/0x200 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1123
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa7c/0x24e0 kernel/exit.c:873
 do_group_exit+0x149/0x310 kernel/exit.c:987
 __do_sys_exit_group kernel/exit.c:998 [inline]
 __se_sys_exit_group kernel/exit.c:996 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:996
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f2a82fa7e59
Code: Unable to access opcode bytes at RIP 0x7f2a82fa7e2f.
RSP: 002b:00007ffeb75c0cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f2a8303d32a RCX: 00007f2a82fa7e59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 0000000000000000 R09: 00007f2a8303d2ca
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeb75c1fb0
R13: 00007f2a8303d2ca R14: 000055558038c4e8 R15: 00007ffeb75c3080
Modules linked in:
CR2: 0000000000000000
---[ end trace d9735f8e816078ed ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc90000c77b40 EFLAGS: 00010246
RAX: 1ffffffff0a52a2f RBX: ffff88811bfb9550 RCX: ffffffff81ac4b27
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811bfb9550
RBP: ffffc90000c77b88 R08: 0000000000000003 R09: 00000000fffffffb
R10: dffffc0000000000 R11: ffffed10237f72b5 R12: 1ffff110237f72aa
R13: dffffc0000000000 R14: ffffffff85295178 R15: ffff88811bfb95a8
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000010cce4000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400