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KASAN: use-after-free Read in fast_dput

Status: auto-obsoleted due to no activity on 2025/04/20 07:57
Reported-by: syzbot+5160e74f03ef759c598a@syzkaller.appspotmail.com
First crash: 296d, last: 107d
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 KASAN: use-after-free Read in fast_dput 1 100d 100d 0/2 auto-obsoleted due to no activity on 2025/04/27 04:39
android-5-10 KASAN: use-after-free Read in fast_dput (2) 1 2d05h 2d05h 0/2 premoderation: reported on 2025/05/05 11:21

Sample crash report:
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc82e6e010
R13: 00007fe241b948f4 R14: 00007ffc82e6e050 R15: 0000000000000015
---[ end trace b231a3148a86a565 ]---
==================================================================
BUG: KASAN: use-after-free in fast_dput+0x1f2/0x2a0 fs/dcache.c:750
Read of size 4 at addr ffff88812b058990 by task syz-executor/1069

CPU: 0 PID: 1069 Comm: syz-executor Tainted: G        W         5.10.233-syzkaller-00881-gfbe98d68b6b3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 fast_dput+0x1f2/0x2a0 fs/dcache.c:750
 dput+0x21/0x80 fs/dcache.c:870
 incfs_free_mount_info+0x60/0x210 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1c2/0x220 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x129/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274
 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fe241b1a057
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc82e6ced8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe241b1a057
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc82e6cf90
RBP: 00007ffc82e6cf90 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffc82e6e010
R13: 00007fe241b948f4 R14: 00007ffc82e6e050 R15: 0000000000000015

Allocated by task 1432:
 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+0xb1/0xe0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583
 slab_alloc_node mm/slub.c:2947 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960
 __d_alloc+0x2d/0x6c0 fs/dcache.c:1714
 d_alloc fs/dcache.c:1793 [inline]
 d_alloc_parallel+0xec/0x1370 fs/dcache.c:2547
 __lookup_slow+0x154/0x400 fs/namei.c:1625
 lookup_one_len+0x180/0x2c0 fs/namei.c:2656
 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:210
 open_or_create_special_dir+0x4f/0x1d0 fs/incfs/vfs.c:469
 incfs_mount_fs+0x48d/0xa10 fs/incfs/vfs.c:1867
 legacy_get_tree+0xf1/0x190 fs/fs_context.c:593
 vfs_get_tree+0x88/0x290 fs/super.c:1572
 do_new_mount+0x2ba/0xb30 fs/namespace.c:2917
 path_mount+0x56f/0xcb0 fs/namespace.c:3247
 do_mount fs/namespace.c:3260 [inline]
 __do_sys_mount fs/namespace.c:3468 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3445
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 1450:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x121/0x160 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:1595 [inline]
 slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621
 slab_free mm/slub.c:3203 [inline]
 kmem_cache_free+0xa9/0x1e0 mm/slub.c:3219
 __d_free+0x23/0x30 fs/dcache.c:271
 rcu_do_batch+0x597/0xc40 kernel/rcu/tree.c:2494
 rcu_core+0x5ad/0xe40 kernel/rcu/tree.c:2735
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748
 __do_softirq+0x268/0x5bb kernel/softirq.c:309

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 __call_rcu kernel/rcu/tree.c:2976 [inline]
 call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3050
 dentry_free+0xbf/0x160
 __dentry_kill+0x505/0x650 fs/dcache.c:597
 dentry_kill+0xc0/0x2a0
 dput+0x40/0x80 fs/dcache.c:883
 incfs_free_mount_info+0x60/0x210 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1c2/0x220 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x129/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274
 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 __call_rcu kernel/rcu/tree.c:2976 [inline]
 call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3050
 dentry_free+0xbf/0x160
 __dentry_kill+0x505/0x650 fs/dcache.c:597
 dentry_kill+0xc0/0x2a0
 dput+0x40/0x80 fs/dcache.c:883
 proc_invalidate_siblings_dcache+0x2aa/0x3d0 fs/proc/inode.c:151
 proc_flush_pid+0x1d/0x20 fs/proc/base.c:3427
 release_task+0x10cb/0x1200 kernel/exit.c:270
 wait_task_zombie kernel/exit.c:1170 [inline]
 wait_consider_task+0x1967/0x2960 kernel/exit.c:1397
 do_wait_thread kernel/exit.c:1460 [inline]
 do_wait+0x318/0x7e0 kernel/exit.c:1531
 kernel_wait4+0x29e/0x3d0 kernel/exit.c:1693
 __do_sys_wait4 kernel/exit.c:1721 [inline]
 __se_sys_wait4 kernel/exit.c:1717 [inline]
 __x64_sys_wait4+0x130/0x1e0 kernel/exit.c:1717
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88812b058990
 which belongs to the cache dentry of size 208
The buggy address is located 0 bytes inside of
 208-byte region [ffff88812b058990, ffff88812b058a60)
The buggy address belongs to the page:
page:ffffea0004ac1600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12b058
flags: 0x4000000000000200(slab)
raw: 4000000000000200 0000000000000000 0000000100000001 ffff88810018b680
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 523, ts 33041750041, free_ts 30416806308
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x80/0x400 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x302/0x4b0 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x1b9/0x2e0 mm/slub.c:2960
 __d_alloc+0x2d/0x6c0 fs/dcache.c:1714
 d_alloc fs/dcache.c:1793 [inline]
 d_alloc_parallel+0xec/0x1370 fs/dcache.c:2547
 __lookup_slow+0x154/0x400 fs/namei.c:1625
 lookup_one_len+0x180/0x2c0 fs/namei.c:2656
 start_creating+0x161/0x2f0 fs/debugfs/inode.c:350
 __debugfs_create_file+0x75/0x4c0 fs/debugfs/inode.c:395
 debugfs_create_file+0x4a/0x60 fs/debugfs/inode.c:457
 kvm_arch_create_vcpu_debugfs+0x34/0x140 arch/x86/kvm/debugfs.c:48
 kvm_create_vcpu_debugfs+0x111/0x170 virt/kvm/kvm_main.c:3201
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 __free_pages_ok+0x82c/0x850 mm/page_alloc.c:1629
 free_the_page+0x76/0x370 mm/page_alloc.c:5409
 __free_pages+0x67/0xc0 mm/page_alloc.c:5418
 kfree+0x1f0/0x270 mm/slub.c:4188
 tcf_em_tree_destroy+0x25c/0x2c0 net/sched/ematch.c:420
 tcf_em_tree_validate+0xdbf/0x1040 net/sched/ematch.c:386
 basic_set_parms net/sched/cls_basic.c:157 [inline]
 basic_change+0x5e7/0x1030 net/sched/cls_basic.c:219
 tc_new_tfilter+0x168e/0x1dc0 net/sched/cls_api.c:2134
 rtnetlink_rcv_msg+0x77a/0xc50 net/core/rtnetlink.c:5598
 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2485
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5625
 netlink_unicast_kernel net/netlink/af_netlink.c:1307 [inline]
 netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1333
 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:652 [inline]
 __sock_sendmsg net/socket.c:664 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2376
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2430
 __sys_sendmsg net/socket.c:2459 [inline]
 __do_sys_sendmsg net/socket.c:2468 [inline]
 __se_sys_sendmsg+0x1b1/0x280 net/socket.c:2466

Memory state around the buggy address:
 ffff88812b058880: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88812b058900: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
>ffff88812b058980: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff88812b058a00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88812b058a80: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1069 at fs/dcache.c:766 fast_dput+0x256/0x2a0 fs/dcache.c:766
Modules linked in:
CPU: 1 PID: 1069 Comm: syz-executor Tainted: G    B   W         5.10.233-syzkaller-00881-gfbe98d68b6b3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:fast_dput+0x256/0x2a0 fs/dcache.c:766
Code: f1 ff e9 d4 fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c f7 fe ff ff 4c 89 ef e8 14 ba f1 ff e9 ea fe ff ff e8 ba 1a b4 ff <0f> 0b e9 c0 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 2a ff ff
RSP: 0018:ffffc90000b57cd8 EFLAGS: 00010293
RAX: ffffffff81b6a3e6 RBX: ffff88812b0589ec RCX: ffff8881169da780
RDX: 0000000000000000 RSI: 00000000ffffff80 RDI: 0000000000000001
RBP: ffffc90000b57d10 R08: ffffffff81b6a33b R09: 0000000000000003
R10: fffff5200016af8c R11: dffffc0000000001 R12: 00000000ffffff80
R13: ffff88812b058990 R14: ffff88812b0589e8 R15: dffffc0000000000
FS:  0000555557357500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563e338e3d90 CR3: 00000001244bb000 CR4: 00000000003506a0
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+0x60/0x210 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1c2/0x220 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x129/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274
 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fe241b1a057
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc82e6ced8 EFLAGS: 00000206
 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe241b1a057
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc82e6cf90
RBP: 00007ffc82e6cf90 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffc82e6e010
R13: 00007fe241b948f4 R14: 00007ffc82e6e050 R15: 0000000000000015
---[ end trace b231a3148a86a566 ]---
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1069 at fs/dcache.c:641 retain_dentry+0x153/0x2a0 fs/dcache.c:641
Modules linked in:
CPU: 1 PID: 1069 Comm: syz-executor Tainted: G    B   W         5.10.233-syzkaller-00881-gfbe98d68b6b3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:retain_dentry+0x153/0x2a0 fs/dcache.c:641
Code: 31 ff e8 f0 1c b4 ff 44 89 e8 83 e0 40 0f 84 a2 00 00 00 e8 2f 19 b4 ff b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 1d 19 b4 ff <0f> 0b e9 fe fe ff ff e8 11 19 b4 ff 31 c0 eb e0 e8 08 19 b4 ff 31
RSP: 0018:ffffc90000b57ce8 EFLAGS: 00010293
RAX: ffffffff81b6a583 RBX: 0000000010000000 RCX: ffff8881169da780
RDX: 0000000000000000 RSI: 0000000010000000 RDI: 0000000000000000
RBP: ffffc90000b57d10 R08: ffffffff81b6a47a R09: 0000000000000003
R10: fffff5200016af84 R11: dffffc0000000001 R12: 1ffff1102560b110
R13: 00000000118f7838 R14: ffff88812b058880 R15: dffffc0000000000
FS:  0000555557357500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563e338e3d90 CR3: 00000001244bb000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 dput+0x34/0x80 fs/dcache.c:878
 incfs_free_mount_info+0x80/0x210 fs/incfs/data_mgmt.c:167
 incfs_kill_sb+0x1c2/0x220 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x129/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274
 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fe241b1a057
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc82e6ced8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe241b1a057
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc82e6cf90
RBP: 00007ffc82e6cf90 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffc82e6e010
R13: 00007fe241b948f4 R14: 00007ffc82e6e050 R15: 0000000000000015
---[ end trace b231a3148a86a567 ]---
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 12361d067 P4D 12361d067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1069 Comm: syz-executor Tainted: G    B   W         5.10.233-syzkaller-00881-gfbe98d68b6b3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc90000b57c78 EFLAGS: 00010246
RAX: 1ffffffff0a91faf RBX: ffffffff8548fd78 RCX: ffffffff81b6b7aa
RDX: 0000000000000000 RSI: 0000000000000286 RDI: ffff88812b058880
RBP: ffffc90000b57cd0 R08: ffffffff81b6b77e R09: 0000000000000003
R10: ffffed102560b11b R11: dffffc0000000001 R12: ffff88812b058880
R13: ffff88812b0588d8 R14: 1ffff1102560b110 R15: dffffc0000000000
FS:  0000555557357500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001244bb000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __dentry_kill+0xcc/0x650 fs/dcache.c:571
 dentry_kill+0xc0/0x2a0
 dput+0x40/0x80 fs/dcache.c:883
 incfs_free_mount_info+0x80/0x210 fs/incfs/data_mgmt.c:167
 incfs_kill_sb+0x1c2/0x220 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x129/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274
 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fe241b1a057
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc82e6ced8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe241b1a057
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc82e6cf90
RBP: 00007ffc82e6cf90 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffc82e6e010
R13: 00007fe241b948f4 R14: 00007ffc82e6e050 R15: 0000000000000015
Modules linked in:
CR2: 0000000000000000
---[ end trace b231a3148a86a568 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc90000b57c78 EFLAGS: 00010246
RAX: 1ffffffff0a91faf RBX: ffffffff8548fd78 RCX: ffffffff81b6b7aa
RDX: 0000000000000000 RSI: 0000000000000286 RDI: ffff88812b058880
RBP: ffffc90000b57cd0 R08: ffffffff81b6b77e R09: 0000000000000003
R10: ffffed102560b11b R11: dffffc0000000001 R12: ffff88812b058880
R13: ffff88812b0588d8 R14: 1ffff1102560b110 R15: dffffc0000000000
FS:  0000555557357500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001244bb000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (14):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/01/20 07:50 android13-5.10-lts fbe98d68b6b3 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2025/01/07 20:02 android13-5.10-lts 49e8ba0a684f f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2025/01/05 06:47 android13-5.10-lts 49e8ba0a684f f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2024/11/27 01:16 android13-5.10-lts 139a6bb26d9d e9a9a9f2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2024/11/26 02:06 android13-5.10-lts 139a6bb26d9d 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2024/10/18 17:57 android13-5.10-lts e5e5644ea27f 666f77ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2024/10/16 08:52 android13-5.10-lts e5e5644ea27f bde2d81c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2024/10/16 08:04 android13-5.10-lts e5e5644ea27f bde2d81c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2024/10/16 08:01 android13-5.10-lts e5e5644ea27f bde2d81c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2024/10/16 08:00 android13-5.10-lts e5e5644ea27f bde2d81c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2024/09/27 15:39 android13-5.10-lts 8d23314f588a 9314348a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2024/08/25 14:53 android13-5.10-lts 0890c03b8b7d d7d32352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2024/08/11 18:55 android13-5.10-lts fd58936f3c1f 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
2024/07/14 22:04 android13-5.10-lts 3feee789f446 eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in fast_dput
* Struck through repros no longer work on HEAD.