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KASAN: use-after-free Read in fast_dput (2)

Status: premoderation: reported on 2025/10/20 04:48
Reported-by: syzbot+0337558a6a2ef6521193@syzkaller.appspotmail.com
First crash: 66d, last: 12h33m
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-1 KASAN: use-after-free Read in fast_dput 19 4 4d16h 61d 0/2 premoderation: reported on 2025/10/25 11:04
android-5-15 KASAN: use-after-free Read in fast_dput 19 1 332d 332d 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 (3) 19 24 1d21h 121d 0/2 premoderation: reported on 2025/08/26 09:24
android-5-10 KASAN: use-after-free Read in fast_dput 19 14 339d 528d 0/2 auto-obsoleted due to no activity on 2025/04/20 07:57
android-5-10 KASAN: use-after-free Read in fast_dput (2) 19 1 234d 234d 0/2 auto-obsoleted due to no activity on 2025/08/03 11:21

Sample crash report:
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffe6eb3ed70
R13: 00007f61d4c72d7d R14: 00005555576294a8 R15: 00007ffe6eb3fe40
 </TASK>
---[ end trace 7387a2a91b7f7900 ]---
==================================================================
BUG: KASAN: use-after-free in fast_dput+0x1e9/0x290 fs/dcache.c:753
Read of size 4 at addr ffff88811199ecc0 by task syz-executor/10010

CPU: 1 PID: 10010 Comm: syz-executor Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0xf1/0x140 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 fast_dput+0x1e9/0x290 fs/dcache.c:753
 dput+0x26/0x90 fs/dcache.c:880
 incfs_free_mount_info+0x60/0x200 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1b8/0x220 fs/incfs/vfs.c:1997
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x446/0x500 fs/namespace.c:1148
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1155
 task_work_run+0x127/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa7e/0x27a0 kernel/exit.c:889
 do_group_exit+0x141/0x310 kernel/exit.c:1003
 __do_sys_exit_group kernel/exit.c:1014 [inline]
 __se_sys_exit_group kernel/exit.c:1012 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1012
 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f61d4bee749
Code: Unable to access opcode bytes at RIP 0x7f61d4bee71f.
RSP: 002b:00007ffe6eb3dab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f61d4c72ddd RCX: 00007f61d4bee749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 00007ffe6eb3b857 R09: 00007ffe6eb3ed70
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffe6eb3ed70
R13: 00007f61d4c72d7d R14: 00005555576294a8 R15: 00007ffe6eb3fe40
 </TASK>

Allocated by task 18683:
 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:433 [inline]
 __kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3245 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
 __d_alloc+0x2d/0x6a0 fs/dcache.c:1749
 d_alloc fs/dcache.c:1828 [inline]
 d_alloc_parallel+0xe1/0x1380 fs/dcache.c:2584
 __lookup_slow+0x13e/0x3e0 fs/namei.c:1656
 lookup_one_len+0x195/0x2c0 fs/namei.c:2726
 incfs_lookup_dentry+0x60/0xb0 fs/incfs/data_mgmt.c:210
 open_or_create_special_dir+0x4f/0x1d0 fs/incfs/vfs.c:475
 incfs_mount_fs+0x42f/0x880 fs/incfs/vfs.c:1884
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1530
 do_new_mount+0x25a/0xa20 fs/namespace.c:3034
 path_mount+0x675/0x1020 fs/namespace.c:3364
 do_mount fs/namespace.c:3377 [inline]
 __do_sys_mount fs/namespace.c:3585 [inline]
 __se_sys_mount+0x318/0x380 fs/namespace.c:3562
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3562
 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 18694:
 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:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
 slab_free mm/slub.c:3526 [inline]
 kmem_cache_free+0x100/0x320 mm/slub.c:3544
 __d_free+0x23/0x30 fs/dcache.c:273
 rcu_do_batch+0x51d/0xba0 kernel/rcu/tree.c:2523
 rcu_core+0x5e4/0xf80 kernel/rcu/tree.c:2763
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776
 handle_softirqs+0x250/0x560 kernel/softirq.c:583
 __do_softirq kernel/softirq.c:621 [inline]
 invoke_softirq kernel/softirq.c:443 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x58/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676

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_common kernel/rcu/tree.c:3011 [inline]
 call_rcu+0x105/0xfe0 kernel/rcu/tree.c:3129
 dentry_free+0xbd/0x150 fs/dcache.c:-1
 __dentry_kill+0x50a/0x650 fs/dcache.c:600
 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1
 dput+0x47/0x90 fs/dcache.c:893
 incfs_free_mount_info+0x60/0x200 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1b8/0x220 fs/incfs/vfs.c:1997
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x446/0x500 fs/namespace.c:1148
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1155
 task_work_run+0x127/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa7e/0x27a0 kernel/exit.c:889
 do_group_exit+0x141/0x310 kernel/exit.c:1003
 __do_sys_exit_group kernel/exit.c:1014 [inline]
 __se_sys_exit_group kernel/exit.c:1012 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1012
 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Second to 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_common kernel/rcu/tree.c:3011 [inline]
 call_rcu+0x105/0xfe0 kernel/rcu/tree.c:3129
 dentry_free+0xbd/0x150 fs/dcache.c:-1
 __dentry_kill+0x50a/0x650 fs/dcache.c:600
 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1
 dput+0x47/0x90 fs/dcache.c:893
 do_unlinkat+0x33f/0x6b0 fs/namei.c:4359
 __do_sys_unlink fs/namei.c:4404 [inline]
 __se_sys_unlink fs/namei.c:4402 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4402
 x64_sys_call+0x878/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88811199ecc0
 which belongs to the cache dentry of size 208
The buggy address is located 0 bytes inside of
 208-byte region [ffff88811199ecc0, ffff88811199ed90)
The buggy address belongs to the page:
page:ffffea0004466780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11199e
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff8881001c4000
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 0x12cd0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_RECLAIMABLE), pid 112, ts 5402262525, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5808
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa1/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x381/0x810 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0x138/0x260 mm/slub.c:3260
 __d_alloc+0x2d/0x6a0 fs/dcache.c:1749
 d_alloc fs/dcache.c:1828 [inline]
 d_alloc_parallel+0xe1/0x1380 fs/dcache.c:2584
 lookup_open fs/namei.c:3395 [inline]
 open_last_lookups fs/namei.c:3540 [inline]
 path_openat+0x958/0x2f10 fs/namei.c:3747
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3777
 do_sys_openat2+0x14c/0x7b0 fs/open.c:1236
 do_sys_open fs/open.c:1252 [inline]
 __do_sys_openat fs/open.c:1268 [inline]
 __se_sys_openat fs/open.c:1263 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1263
 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811199eb80: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb
 ffff88811199ec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88811199ec80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
                                           ^
 ffff88811199ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811199ed80: fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00
==================================================================
------------[ cut here ]------------
WARNING: CPU: 0 PID: 10010 at fs/dcache.c:769 fast_dput+0x210/0x290 fs/dcache.c:769
Modules linked in:
CPU: 0 PID: 10010 Comm: syz-executor Tainted: G    B   W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:fast_dput+0x210/0x290 fs/dcache.c:769
Code: 15 f3 ff e9 46 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 99 fe ff ff 48 89 df e8 ba 15 f3 ff e9 8c fe ff ff e8 20 93 b4 ff <0f> 0b e9 0b ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c e4 fe ff
RSP: 0000:ffffc90001217b40 EFLAGS: 00010293
RAX: ffffffff81b42c30 RBX: ffff88811199ecc0 RCX: ffff888119182780
RDX: 0000000000000000 RSI: 00000000ffffff80 RDI: 0000000000000001
RBP: ffffc90001217b70 R08: 0000000000000004 R09: 0000000000000003
R10: fffff52000242f58 R11: 1ffff92000242f58 R12: 00000000ffffff80
R13: dffffc0000000000 R14: ffff88811199ed18 R15: 1ffff11022333da3
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc6c1913d58 CR3: 0000000147224000 CR4: 00000000003506b0
DR0: 0000000000000009 DR1: 0000000000000008 DR2: 0000000000000008
DR3: 000000000000075f DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dput+0x26/0x90 fs/dcache.c:880
 incfs_free_mount_info+0x60/0x200 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1b8/0x220 fs/incfs/vfs.c:1997
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x446/0x500 fs/namespace.c:1148
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1155
 task_work_run+0x127/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa7e/0x27a0 kernel/exit.c:889
 do_group_exit+0x141/0x310 kernel/exit.c:1003
 __do_sys_exit_group kernel/exit.c:1014 [inline]
 __se_sys_exit_group kernel/exit.c:1012 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1012
 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f61d4bee749
Code: Unable to access opcode bytes at RIP 0x7f61d4bee71f.
RSP: 002b:00007ffe6eb3dab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f61d4c72ddd RCX: 00007f61d4bee749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 00007ffe6eb3b857 R09: 00007ffe6eb3ed70
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffe6eb3ed70
R13: 00007f61d4c72d7d R14: 00005555576294a8 R15: 00007ffe6eb3fe40
 </TASK>
---[ end trace 7387a2a91b7f7901 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 10010 at fs/dcache.c:644 retain_dentry+0x158/0x2a0 fs/dcache.c:644
Modules linked in:
CPU: 0 PID: 10010 Comm: syz-executor Tainted: G    B   W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:retain_dentry+0x158/0x2a0 fs/dcache.c:644
Code: 31 ff e8 1b 95 b4 ff 44 89 e8 83 e0 40 0f 84 a5 00 00 00 e8 5a 91 b4 ff b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 48 91 b4 ff <0f> 0b e9 f9 fe ff ff e8 3c 91 b4 ff 31 c0 eb e0 e8 33 91 b4 ff 31
RSP: 0000:ffffc90001217b48 EFLAGS: 00010293
RAX: ffffffff81b42e08 RBX: ffff88811199ebb0 RCX: ffff888119182780
RDX: 0000000000000000 RSI: 0000000010000000 RDI: 0000000000000000
RBP: ffffc90001217b70 R08: 0000000000000004 R09: 0000000000000003
R10: fffff52000242f50 R11: 1ffff92000242f50 R12: 1ffff11022333d76
R13: ffff888121a563c8 R14: 0000000010000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc6c1913d58 CR3: 000000000660f000 CR4: 00000000003506b0
DR0: 0000000000000009 DR1: 0000000000000008 DR2: 0000000000000008
DR3: 000000000000075f DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dput+0x3b/0x90 fs/dcache.c:888
 incfs_free_mount_info+0x80/0x200 fs/incfs/data_mgmt.c:167
 incfs_kill_sb+0x1b8/0x220 fs/incfs/vfs.c:1997
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x446/0x500 fs/namespace.c:1148
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1155
 task_work_run+0x127/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa7e/0x27a0 kernel/exit.c:889
 do_group_exit+0x141/0x310 kernel/exit.c:1003
 __do_sys_exit_group kernel/exit.c:1014 [inline]
 __se_sys_exit_group kernel/exit.c:1012 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1012
 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f61d4bee749
Code: Unable to access opcode bytes at RIP 0x7f61d4bee71f.
RSP: 002b:00007ffe6eb3dab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f61d4c72ddd RCX: 00007f61d4bee749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 00007ffe6eb3b857 R09: 00007ffe6eb3ed70
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffe6eb3ed70
R13: 00007f61d4c72d7d R14: 00005555576294a8 R15: 00007ffe6eb3fe40
 </TASK>
---[ end trace 7387a2a91b7f7902 ]---
list_del corruption. prev->next should be ffff88811199ec40, but was ffff88811199e090
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:61!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10010 Comm: syz-executor Tainted: G    B   W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__list_del_entry_valid+0x10c/0x120 lib/list_debug.c:59
Code: 48 89 de e8 56 d9 4f 02 0f 0b 48 c7 c7 80 4d 63 85 48 89 de e8 45 d9 4f 02 0f 0b 48 c7 c7 e0 4d 63 85 48 89 de e8 34 d9 4f 02 <0f> 0b 48 c7 c7 40 4e 63 85 48 89 de e8 23 d9 4f 02 0f 0b 00 55 48
RSP: 0000:ffffc90001217ab8 EFLAGS: 00010246
RAX: 0000000000000054 RBX: ffff88811199ec40 RCX: 38a8170cfd036600
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc90001217ad8 R08: dffffc0000000000 R09: ffffed103ee065e8
R10: ffffed103ee065e8 R11: 1ffff1103ee065e7 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88811199e090 R15: ffff8881118fc800
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc6c1913d58 CR3: 000000000660f000 CR4: 00000000003506b0
DR0: 0000000000000009 DR1: 0000000000000008 DR2: 0000000000000008
DR3: 000000000000075f DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry include/linux/list.h:132 [inline]
 dentry_unlist fs/dcache.c:529 [inline]
 __dentry_kill+0x24c/0x650 fs/dcache.c:582
 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1
 dput+0x47/0x90 fs/dcache.c:893
 incfs_free_mount_info+0x80/0x200 fs/incfs/data_mgmt.c:167
 incfs_kill_sb+0x1b8/0x220 fs/incfs/vfs.c:1997
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x446/0x500 fs/namespace.c:1148
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1155
 task_work_run+0x127/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa7e/0x27a0 kernel/exit.c:889
 do_group_exit+0x141/0x310 kernel/exit.c:1003
 __do_sys_exit_group kernel/exit.c:1014 [inline]
 __se_sys_exit_group kernel/exit.c:1012 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1012
 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f61d4bee749
Code: Unable to access opcode bytes at RIP 0x7f61d4bee71f.
RSP: 002b:00007ffe6eb3dab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f61d4c72ddd RCX: 00007f61d4bee749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 00007ffe6eb3b857 R09: 00007ffe6eb3ed70
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffe6eb3ed70
R13: 00007f61d4c72d7d R14: 00005555576294a8 R15: 00007ffe6eb3fe40
 </TASK>
Modules linked in:
---[ end trace 7387a2a91b7f7903 ]---
RIP: 0010:__list_del_entry_valid+0x10c/0x120 lib/list_debug.c:59
Code: 48 89 de e8 56 d9 4f 02 0f 0b 48 c7 c7 80 4d 63 85 48 89 de e8 45 d9 4f 02 0f 0b 48 c7 c7 e0 4d 63 85 48 89 de e8 34 d9 4f 02 <0f> 0b 48 c7 c7 40 4e 63 85 48 89 de e8 23 d9 4f 02 0f 0b 00 55 48
RSP: 0000:ffffc90001217ab8 EFLAGS: 00010246
RAX: 0000000000000054 RBX: ffff88811199ec40 RCX: 38a8170cfd036600
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc90001217ad8 R08: dffffc0000000000 R09: ffffed103ee065e8
R10: ffffed103ee065e8 R11: 1ffff1103ee065e7 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88811199e090 R15: ffff8881118fc800
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc6c1913d58 CR3: 000000000660f000 CR4: 00000000003506b0
DR0: 0000000000000009 DR1: 0000000000000008 DR2: 0000000000000008
DR3: 000000000000075f DR6: 00000000ffff0ff0 DR7: 0000000000000400

Crashes (35):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/25 05:19 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/25 03:03 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/24 16:06 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/24 11:10 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/24 09:03 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/24 01:49 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/23 18:02 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/22 13:42 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/21 20:13 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/21 09:27 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/20 08:44 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/19 04:41 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/16 10:54 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/15 11:53 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/14 17:13 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/14 07:33 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/13 22:34 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/13 18:25 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/13 16:32 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/11 21:28 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/11 18:25 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/08 21:46 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/08 14:37 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/07 12:06 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/04 19:46 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/04 09:51 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/03 07:38 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/02 16:09 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/02 10:57 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/12/01 13:55 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/11/28 15:55 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/11/28 09:25 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/11/11 02:09 android13-5.15-lts 8a8f52308945 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/11/09 20:12 android13-5.15-lts 8a8f52308945 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
2025/10/20 04:47 android13-5.15-lts bce84c40a40b 1c8c8cd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in fast_dput
* Struck through repros no longer work on HEAD.