KASAN: use-after-free Read in fast

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
android-5-10	KASAN: use-after-free Read in fast_dput				14	34d	223d	0/2	premoderation: reported on 2024/07/14 22:05
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffe8831cb80
R13: 00007f497602908c R14: 000055556be614a8 R15: 0000000000000004
 </TASK>
---[ end trace 100ab3827df7b216 ]---
==================================================================
BUG: KASAN: use-after-free in fast_dput+0x1f2/0x2a0 fs/dcache.c:753
Read of size 4 at addr ffff888112ec0220 by task syz-executor/1013

CPU: 1 PID: 1013 Comm: syz-executor Tainted: G        W         5.15.176-syzkaller-00972-g829d9f138569 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 fast_dput+0x1f2/0x2a0 fs/dcache.c:753
 dput+0x26/0x80 fs/dcache.c:880
 incfs_free_mount_info+0x60/0x210 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1d4/0x230 fs/incfs/vfs.c:1997
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150
 task_work_run+0x129/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xc48/0x2ca0 kernel/exit.c:880
 do_group_exit+0x141/0x310 kernel/exit.c:1002
 __do_sys_exit_group kernel/exit.c:1013 [inline]
 __se_sys_exit_group kernel/exit.c:1011 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011
 x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4975fa7d29
Code: Unable to access opcode bytes at RIP 0x7f4975fa7cff.
RSP: 002b:00007ffe8831b8c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f49760290ec RCX: 00007f4975fa7d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 00007ffe88319667 R09: 00007ffe8831cb80
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffe8831cb80
R13: 00007f497602908c R14: 000055556be614a8 R15: 0000000000000004
 </TASK>

Allocated by task 1099:
 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+0xb1/0xe0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3240 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc+0xf5/0x250 mm/slub.c:3255
 __d_alloc+0x2d/0x6c0 fs/dcache.c:1749
 d_alloc fs/dcache.c:1828 [inline]
 d_alloc_parallel+0xe6/0x12e0 fs/dcache.c:2582
 __lookup_slow+0x154/0x400 fs/namei.c:1648
 lookup_one_len+0x187/0x2c0 fs/namei.c:2718
 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:210
 open_or_create_special_dir+0x4f/0x1d0 fs/incfs/vfs.c:475
 incfs_mount_fs+0x49b/0xa30 fs/incfs/vfs.c:1884
 legacy_get_tree+0xf1/0x190 fs/fs_context.c:611
 vfs_get_tree+0x88/0x290 fs/super.c:1530
 do_new_mount+0x2ba/0xb30 fs/namespace.c:3012
 path_mount+0x671/0x1070 fs/namespace.c:3342
 do_mount fs/namespace.c:3355 [inline]
 __do_sys_mount fs/namespace.c:3563 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3540
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3540
 x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 1190:
 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+0x126/0x160 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:1723 [inline]
 slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749
 slab_free mm/slub.c:3521 [inline]
 kmem_cache_free+0x115/0x330 mm/slub.c:3539
 __d_free+0x23/0x30 fs/dcache.c:273
 rcu_do_batch+0x57a/0xc10 kernel/rcu/tree.c:2523
 rcu_core+0x517/0x1020 kernel/rcu/tree.c:2763
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776
 handle_softirqs+0x25e/0x5c0 kernel/softirq.c:565
 __do_softirq kernel/softirq.c:603 [inline]
 invoke_softirq kernel/softirq.c:425 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:652
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:664
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 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+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 __call_rcu_common kernel/rcu/tree.c:3007 [inline]
 call_rcu+0x123/0x10b0 kernel/rcu/tree.c:3125
 dentry_free+0xbf/0x160
 __dentry_kill+0x505/0x660 fs/dcache.c:600
 dentry_kill+0xc0/0x2a0
 dput+0x45/0x80 fs/dcache.c:893
 incfs_free_mount_info+0x60/0x210 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1d4/0x230 fs/incfs/vfs.c:1997
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150
 task_work_run+0x129/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xc48/0x2ca0 kernel/exit.c:880
 do_group_exit+0x141/0x310 kernel/exit.c:1002
 __do_sys_exit_group kernel/exit.c:1013 [inline]
 __se_sys_exit_group kernel/exit.c:1011 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011
 x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 __call_rcu_common kernel/rcu/tree.c:3007 [inline]
 call_rcu+0x123/0x10b0 kernel/rcu/tree.c:3125
 dentry_free+0xbf/0x160
 __dentry_kill+0x505/0x660 fs/dcache.c:600
 dentry_kill+0xc0/0x2a0
 dput+0x45/0x80 fs/dcache.c:893
 do_unlinkat+0x4a0/0x920 fs/namei.c:4351
 __do_sys_unlink fs/namei.c:4396 [inline]
 __se_sys_unlink fs/namei.c:4394 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4394
 x64_sys_call+0x289/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff888112ec0220
 which belongs to the cache dentry of size 208
The buggy address is located 0 bytes inside of
 208-byte region [ffff888112ec0220, ffff888112ec02f0)
The buggy address belongs to the page:
page:ffffea00044bb000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112ec0
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea00044b1c00 0000000400000003 ffff8881001c4c00
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 334, ts 22867245414, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0x9a/0x4e0 mm/slub.c:1995
 ___slab_alloc+0x39e/0x830 mm/slub.c:3028
 __slab_alloc+0x4a/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc+0x139/0x250 mm/slub.c:3255
 __d_alloc+0x2d/0x6c0 fs/dcache.c:1749
 d_alloc fs/dcache.c:1828 [inline]
 d_alloc_parallel+0xe6/0x12e0 fs/dcache.c:2582
 lookup_open fs/namei.c:3387 [inline]
 open_last_lookups fs/namei.c:3532 [inline]
 path_openat+0xa02/0x2f40 fs/namei.c:3739
 do_filp_open+0x21c/0x460 fs/namei.c:3769
 do_sys_openat2+0x13f/0x820 fs/open.c:1234
 do_sys_open fs/open.c:1250 [inline]
 __do_sys_openat fs/open.c:1266 [inline]
 __se_sys_openat fs/open.c:1261 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1261
 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888112ec0100: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888112ec0180: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888112ec0200: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff888112ec0280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
 ffff888112ec0300: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1013 at fs/dcache.c:769 fast_dput+0x256/0x2a0
Modules linked in:
CPU: 1 PID: 1013 Comm: syz-executor Tainted: G    B   W         5.15.176-syzkaller-00972-g829d9f138569 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:fast_dput+0x256/0x2a0 fs/dcache.c:769
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 04 d8 f1 ff e9 ea fe ff ff e8 6a 72 af 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:ffffc900010a7b20 EFLAGS: 00010293
RAX: ffffffff81c0f9f6 RBX: ffff888112ec027c RCX: ffff88811b3c3b40
RDX: 0000000000000000 RSI: 00000000ffffff80 RDI: 0000000000000001
RBP: ffffc900010a7b58 R08: ffffffff81c0f94b R09: 0000000000000003
R10: fffff52000214f54 R11: dffffc0000000001 R12: 00000000ffffff80
R13: ffff888112ec0220 R14: ffff888112ec0278 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2cbf22 CR3: 000000012f910000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dput+0x26/0x80 fs/dcache.c:880
 incfs_free_mount_info+0x60/0x210 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1d4/0x230 fs/incfs/vfs.c:1997
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150
 task_work_run+0x129/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xc48/0x2ca0 kernel/exit.c:880
 do_group_exit+0x141/0x310 kernel/exit.c:1002
 __do_sys_exit_group kernel/exit.c:1013 [inline]
 __se_sys_exit_group kernel/exit.c:1011 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011
 x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4975fa7d29
Code: Unable to access opcode bytes at RIP 0x7f4975fa7cff.
RSP: 002b:00007ffe8831b8c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f49760290ec RCX: 00007f4975fa7d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 00007ffe88319667 R09: 00007ffe8831cb80
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffe8831cb80
R13: 00007f497602908c R14: 000055556be614a8 R15: 0000000000000004
 </TASK>
---[ end trace 100ab3827df7b217 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1013 at fs/dcache.c:644 retain_dentry+0x153/0x2a0
Modules linked in:
CPU: 0 PID: 1013 Comm: syz-executor Tainted: G    B   W         5.15.176-syzkaller-00972-g829d9f138569 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:retain_dentry+0x153/0x2a0 fs/dcache.c:644
Code: 31 ff e8 a0 74 af ff 44 89 e8 83 e0 40 0f 84 a2 00 00 00 e8 df 70 af ff b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 cd 70 af ff <0f> 0b e9 fe fe ff ff e8 c1 70 af ff 31 c0 eb e0 e8 b8 70 af ff 31
RSP: 0018:ffffc900010a7b30 EFLAGS: 00010293
RAX: ffffffff81c0fb93 RBX: 0000000010000000 RCX: ffff88811b3c3b40
RDX: 0000000000000000 RSI: 0000000010000000 RDI: 0000000000000000
RBP: ffffc900010a7b58 R08: ffffffff81c0fa8a R09: 0000000000000003
R10: fffff52000214f4c R11: dffffc0000000001 R12: 1ffff110225d8110
R13: 0000000010e0b568 R14: ffff888112ec0880 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555559a5528 CR3: 000000011c951000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dput+0x39/0x80 fs/dcache.c:888
 incfs_free_mount_info+0x80/0x210 fs/incfs/data_mgmt.c:167
 incfs_kill_sb+0x1d4/0x230 fs/incfs/vfs.c:1997
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150
 task_work_run+0x129/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xc48/0x2ca0 kernel/exit.c:880
 do_group_exit+0x141/0x310 kernel/exit.c:1002
 __do_sys_exit_group kernel/exit.c:1013 [inline]
 __se_sys_exit_group kernel/exit.c:1011 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011
 x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4975fa7d29
Code: Unable to access opcode bytes at RIP 0x7f4975fa7cff.
RSP: 002b:00007ffe8831b8c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f49760290ec RCX: 00007f4975fa7d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 00007ffe88319667 R09: 00007ffe8831cb80
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffe8831cb80
R13: 00007f497602908c R14: 000055556be614a8 R15: 0000000000000004
 </TASK>
---[ end trace 100ab3827df7b218 ]---
list_del corruption. prev->next should be ffff888112ec0910, but was ffff888112ec05e0
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:61!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1013 Comm: syz-executor Tainted: G    B   W         5.15.176-syzkaller-00972-g829d9f138569 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:__list_del_entry_valid+0x10c/0x120 lib/list_debug.c:59
Code: 4c 89 f6 e8 16 ac 76 02 0f 0b 48 c7 c7 c0 4f a3 85 4c 89 f6 e8 05 ac 76 02 0f 0b 48 c7 c7 20 50 a3 85 4c 89 f6 e8 f4 ab 76 02 <0f> 0b 48 c7 c7 80 50 a3 85 4c 89 f6 e8 e3 ab 76 02 0f 0b cc 55 48
RSP: 0018:ffffc900010a7a98 EFLAGS: 00010246
RAX: 0000000000000054 RBX: ffff888112ec05e0 RCX: a20e6ca45e101000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc900010a7ab8 R08: ffffffff8157a565 R09: ffffed103ee065e8
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888112ec08d8 R14: ffff888112ec0910 R15: ffff888112fe8090
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555559a5528 CR3: 000000011c951000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry include/linux/list.h:132 [inline]
 dentry_unlist fs/dcache.c:529 [inline]
 __dentry_kill+0x250/0x660 fs/dcache.c:582
 dentry_kill+0xc0/0x2a0
 dput+0x45/0x80 fs/dcache.c:893
 incfs_free_mount_info+0x80/0x210 fs/incfs/data_mgmt.c:167
 incfs_kill_sb+0x1d4/0x230 fs/incfs/vfs.c:1997
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150
 task_work_run+0x129/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xc48/0x2ca0 kernel/exit.c:880
 do_group_exit+0x141/0x310 kernel/exit.c:1002
 __do_sys_exit_group kernel/exit.c:1013 [inline]
 __se_sys_exit_group kernel/exit.c:1011 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011
 x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4975fa7d29
Code: Unable to access opcode bytes at RIP 0x7f4975fa7cff.
RSP: 002b:00007ffe8831b8c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f49760290ec RCX: 00007f4975fa7d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 00007ffe88319667 R09: 00007ffe8831cb80
R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffe8831cb80
R13: 00007f497602908c R14: 000055556be614a8 R15: 0000000000000004
 </TASK>
Modules linked in:
---[ end trace 100ab3827df7b219 ]---
RIP: 0010:__list_del_entry_valid+0x10c/0x120 lib/list_debug.c:59
Code: 4c 89 f6 e8 16 ac 76 02 0f 0b 48 c7 c7 c0 4f a3 85 4c 89 f6 e8 05 ac 76 02 0f 0b 48 c7 c7 20 50 a3 85 4c 89 f6 e8 f4 ab 76 02 <0f> 0b 48 c7 c7 80 50 a3 85 4c 89 f6 e8 e3 ab 76 02 0f 0b cc 55 48
RSP: 0018:ffffc900010a7a98 EFLAGS: 00010246
RAX: 0000000000000054 RBX: ffff888112ec05e0 RCX: a20e6ca45e101000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc900010a7ab8 R08: ffffffff8157a565 R09: ffffed103ee065e8
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888112ec08d8 R14: ffff888112ec0910 R15: ffff888112fe8090
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555559a5528 CR3: 000000011c951000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400