ci2 starts bisection 2026-10-02 22:52:23.270798291 +0000 UTC m=+19760.854125671 bisecting fixing commit since 0ebdd0175e372714fde617de984849ab045ceea4 building syzkaller on 614e416a2c34ab81eb2b80817ccfa47c00429056 ensuring issue is reproducible on original commit 0ebdd0175e372714fde617de984849ab045ceea4 testing commit 0ebdd0175e372714fde617de984849ab045ceea4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: a53ae577ced214957973540346d68d920ac7eb51b749378d7f833ce1d9ea8471 run #0: crashed: KASAN: use-after-free Write in config_item_get run #1: crashed: KASAN: use-after-free Write in config_item_get run #2: crashed: KASAN: use-after-free Write in config_item_put run #3: crashed: KASAN: use-after-free Write in config_item_get run #4: crashed: KASAN: use-after-free Write in config_item_put run #5: crashed: KASAN: use-after-free Write in config_item_get run #6: crashed: KASAN: use-after-free Write in config_item_get run #7: crashed: KASAN: use-after-free Write in config_item_get run #8: crashed: KASAN: use-after-free Write in config_item_get run #9: crashed: KASAN: use-after-free Write in config_item_get run #10: crashed: KASAN: use-after-free Write in config_item_get run #11: crashed: KASAN: use-after-free Write in config_item_get run #12: crashed: KASAN: use-after-free Write in config_item_get run #13: crashed: KASAN: use-after-free Write in config_item_get run #14: crashed: KASAN: use-after-free Write in config_item_get run #15: crashed: KASAN: use-after-free Write in config_item_get run #16: crashed: KASAN: use-after-free Write in config_item_put run #17: crashed: KASAN: use-after-free Write in config_item_get run #18: crashed: KASAN: use-after-free Write in config_item_get run #19: crashed: KASAN: use-after-free Write in config_item_get representative crash: KASAN: use-after-free Write in config_item_get, types: [KASAN-USE-AFTER-FREE-WRITE] check whether we can drop unnecessary instrumentation disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit 0ebdd0175e372714fde617de984849ab045ceea4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: e9a874220cda2685a86f09b86207a10aa16c20e0ba6a8ae6e9dbd6e0db957e86 run #0: crashed: KASAN: use-after-free Write in config_item_get run #1: crashed: KASAN: use-after-free Write in config_item_get run #2: crashed: KASAN: use-after-free Write in config_item_get run #3: crashed: KASAN: use-after-free Write in config_item_put run #4: crashed: KASAN: use-after-free Write in config_item_get run #5: crashed: KASAN: use-after-free Write in config_item_get run #6: crashed: KASAN: use-after-free Write in config_item_put run #7: crashed: KASAN: use-after-free Write in config_item_get run #8: crashed: KASAN: use-after-free Write in config_item_get run #9: crashed: KASAN: use-after-free Write in config_item_get representative crash: KASAN: use-after-free Write in config_item_get, types: [KASAN-USE-AFTER-FREE-WRITE] the bug reproduces without the instrumentation disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed kconfig minimization: base=4921 full=6218 leaves diff=256 split chunks (needed=false): <256> split chunk #0 of len 256 into 5 parts testing without sub-chunk 1/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 0ebdd0175e372714fde617de984849ab045ceea4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 23712e77c081f8b6cba0b4a899ea7c20b51033c6588fe854de7d820685bb27d2 run #0: crashed: KASAN: use-after-free Write in config_item_get run #1: crashed: KASAN: use-after-free Write in config_item_get run #2: crashed: KASAN: use-after-free Write in config_item_get run #3: crashed: KASAN: use-after-free Write in config_item_put run #4: crashed: KASAN: use-after-free Write in config_item_get run #5: crashed: KASAN: use-after-free Write in config_item_put run #6: crashed: KASAN: use-after-free Write in config_item_get run #7: crashed: KASAN: use-after-free Write in config_item_get run #8: crashed: KASAN: use-after-free Write in config_item_get run #9: crashed: KASAN: use-after-free Write in config_item_get representative crash: KASAN: use-after-free Write in config_item_get, types: [KASAN-USE-AFTER-FREE-WRITE] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed testing commit 0ebdd0175e372714fde617de984849ab045ceea4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 509dfd817362e1263bfbee741bd1adc63d9f7d9a6594047605a9836d63814d01 run #0: crashed: KASAN: use-after-free Write in config_item_put run #1: crashed: KASAN: use-after-free Write in config_item_get run #2: crashed: KASAN: use-after-free Write in config_item_get run #3: crashed: KASAN: use-after-free Write in config_item_get run #4: crashed: KASAN: use-after-free Write in config_item_get run #5: crashed: KASAN: use-after-free Write in config_item_get run #6: crashed: KASAN: use-after-free Write in config_item_put run #7: crashed: KASAN: use-after-free Write in config_item_get run #8: crashed: KASAN: use-after-free Write in config_item_get run #9: crashed: KASAN: use-after-free Write in config_item_get representative crash: KASAN: use-after-free Write in config_item_put, types: [KASAN-USE-AFTER-FREE-WRITE] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 0ebdd0175e372714fde617de984849ab045ceea4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 1f9f8a158602f5f6b8a9e68a39e2c5aa154cb49fdd7fd96d03fe3641ae15ffe3 all runs: crashed: KASAN: use-after-free Write in config_item_get representative crash: KASAN: use-after-free Write in config_item_get, types: [KASAN-USE-AFTER-FREE-WRITE] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed testing commit 0ebdd0175e372714fde617de984849ab045ceea4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 086f0b8a33d6dfa1469e79292958daa1b4f4be22fbad2dc00cf00d2f69285aa5 all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed testing commit 0ebdd0175e372714fde617de984849ab045ceea4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building 0ebdd0175e372714fde617de984849ab045ceea4: net/socket.c:1189:(.text+0x6dea): undefined reference to `wext_handle_ioctl' net/socket.c:3390:(.text+0x73e4): undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:343:(.text+0x33b): undefined reference to `wext_proc_exit' net/core/net-procfs.c:327:(.text+0x4e2): undefined reference to `wext_proc_init' minimized to 100 configs; suspects: [HID_ZEROPLUS SND SOUND USB_BELKIN USB_CONFIGFS USB_CONFIGFS_ACM USB_CONFIGFS_ECM USB_CONFIGFS_ECM_SUBSET USB_CONFIGFS_EEM USB_CONFIGFS_F_ACC USB_CONFIGFS_F_AUDIO_SRC USB_CONFIGFS_F_FS USB_CONFIGFS_F_HID USB_CONFIGFS_F_LB_SS USB_CONFIGFS_F_MIDI USB_CONFIGFS_F_PRINTER USB_CONFIGFS_F_UAC1 USB_CONFIGFS_F_UAC1_LEGACY USB_CONFIGFS_F_UAC2 USB_CONFIGFS_F_UVC USB_CONFIGFS_MASS_STORAGE USB_CONFIGFS_NCM USB_CONFIGFS_OBEX USB_CONFIGFS_RNDIS USB_CONFIGFS_SERIAL USB_CONFIGFS_UEVENT USB_EHSET_TEST_FIXTURE USB_F_ACC USB_F_ACM USB_F_AUDIO_SRC USB_F_ECM USB_F_EEM USB_F_FS USB_F_HID USB_F_MASS_STORAGE USB_F_MIDI USB_F_NCM USB_F_OBEX USB_F_PRINTER USB_F_RNDIS USB_F_SERIAL USB_F_SS_LB USB_F_SUBSET USB_F_UAC1 USB_F_UAC1_LEGACY USB_F_UAC2 USB_F_UVC USB_GADGET_DEBUG_FILES USB_GADGET_DEBUG_FS USB_IPHETH USB_ISP1760 USB_ISP1760_HCD USB_ISP1760_HOST_ROLE USB_LIBCOMPOSITE USB_LINK_LAYER_TEST USB_MON USB_NET_CDC_MBIM USB_NET_CDC_SUBSET USB_NET_CDC_SUBSET_ENABLE USB_NET_DM9601 USB_NET_GL620A USB_NET_MCS7830 USB_NET_NET1080 USB_NET_PLUSB USB_NET_RNDIS_HOST USB_NET_SMSC75XX USB_NET_SMSC95XX USB_NET_SR9700 USB_NET_SR9800 USB_NET_ZAURUS USB_OHCI_HCD USB_OHCI_HCD_PCI USB_OHCI_HCD_PLATFORM USB_OTG USB_OTG_FSM USB_PRINTER USB_SERIAL USB_SERIAL_FTDI_SIO USB_SERIAL_GENERIC USB_SERIAL_PL2303 USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_TRANCEVIBRATOR USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_WDM USB_XHCI_PCI_RENESAS WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_ZYDAS ZEROPLUS_FF] disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing current HEAD f5eaed2bbe33b10b297b366bb5d02819356b5c13 testing commit f5eaed2bbe33b10b297b366bb5d02819356b5c13 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 108b9df7e73555d0f80ea9f82846fdd24bf0684de3e48a34dd97a168caf8398f run #0: crashed: KASAN: use-after-free Write in config_item_put run #1: crashed: KASAN: use-after-free Write in config_item_get run #2: crashed: KASAN: use-after-free Write in config_item_get run #3: crashed: KASAN: use-after-free Write in config_item_get run #4: crashed: KASAN: use-after-free Write in config_item_get run #5: crashed: KASAN: use-after-free Write in config_item_put run #6: crashed: KASAN: use-after-free Write in config_item_get run #7: crashed: KASAN: use-after-free Write in config_item_get run #8: crashed: KASAN: use-after-free Write in config_item_get run #9: crashed: KASAN: use-after-free Write in config_item_put representative crash: KASAN: use-after-free Write in config_item_put, types: [KASAN-USE-AFTER-FREE-WRITE] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 2h32m31.777689143s (build: 1h3m17.334626533s, test: 1h11m52.629436402s) crash still not fixed or there were kernel test errors commit msg: Merge 9f30ba9aa027 ("tcp: clear sock_ops cb flags before force-closing a child socket") into android13-5.15-lts crash: KASAN: use-after-free Write in config_item_put ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline] BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline] BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline] BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline] BUG: KASAN: use-after-free in kref_put include/linux/kref.h:64 [inline] BUG: KASAN: use-after-free in config_item_put+0x21/0x60 fs/configfs/item.c:149 Write of size 4 at addr ffff8881021af81c by task syz.2.515/1487 CPU: 0 PID: 1487 Comm: syz.2.515 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x38/0x49 lib/dump_stack.c:106 print_address_description.constprop.0+0x24/0x160 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report.cold+0x82/0xdb mm/kasan/report.c:444 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x148/0x190 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline] __refcount_sub_and_test include/linux/refcount.h:272 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] kref_put include/linux/kref.h:64 [inline] config_item_put+0x21/0x60 fs/configfs/item.c:149 configfs_symlink+0x3b3/0xe90 fs/configfs/symlink.c:212 vfs_symlink fs/namei.c:4437 [inline] vfs_symlink+0xe9/0x2b0 fs/namei.c:4422 do_symlinkat+0x134/0x2a0 fs/namei.c:4466 __do_sys_symlinkat fs/namei.c:4483 [inline] __se_sys_symlinkat fs/namei.c:4480 [inline] __x64_sys_symlinkat+0x94/0xc0 fs/namei.c:4480 x64_sys_call+0x2ac/0x990 arch/x86/include/generated/asm/syscalls_64.h:267 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5f690700d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5f68ed1028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007f5f692f7fa0 RCX: 00007f5f690700d9 RDX: 00002000000002c0 RSI: ffffffffffffff9c RDI: 0000200000000280 RBP: 00007f5f69107024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5f692f8038 R14: 00007f5f692f7fa0 R15: 00007ffee39187c8 Allocated by task 1484: kasan_save_stack+0x26/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] ____kasan_kmalloc mm/kasan/common.c:471 [inline] __kasan_kmalloc+0xae/0xe0 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] kmem_cache_alloc_trace+0x30c/0x4e0 mm/slub.c:3274 kmalloc include/linux/slab.h:619 [inline] kzalloc include/linux/slab.h:750 [inline] geth_alloc_inst+0x44/0x130 drivers/usb/gadget/function/f_subset.c:434 try_get_usb_function_instance+0xee/0x190 drivers/usb/gadget/functions.c:28 usb_get_function_instance+0xe/0x50 drivers/usb/gadget/functions.c:44 function_make+0xf6/0x410 drivers/usb/gadget/configfs.c:642 configfs_mkdir+0x3e0/0xa50 fs/configfs/dir.c:1360 vfs_mkdir+0x1d5/0x430 fs/namei.c:4073 do_mkdirat+0x152/0x2c0 fs/namei.c:4098 __do_sys_mkdirat fs/namei.c:4113 [inline] __se_sys_mkdirat fs/namei.c:4111 [inline] __x64_sys_mkdirat+0xf4/0x140 fs/namei.c:4111 x64_sys_call+0x2e4/0x990 arch/x86/include/generated/asm/syscalls_64.h:259 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 1486: kasan_save_stack+0x26/0x50 mm/kasan/common.c:38 kasan_set_track+0x25/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x24/0x40 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:365 [inline] ____kasan_slab_free mm/kasan/common.c:327 [inline] __kasan_slab_free+0x111/0x150 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+0x94/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc2/0x2a0 mm/slub.c:4588 geth_free_inst+0x86/0xa0 drivers/usb/gadget/function/f_subset.c:427 usb_put_function_instance+0x85/0xb0 drivers/usb/gadget/functions.c:77 gether_attr_release+0x9/0x10 drivers/usb/gadget/function/f_subset.c:390 config_item_cleanup+0x122/0x210 fs/configfs/item.c:128 config_item_release fs/configfs/item.c:137 [inline] kref_put include/linux/kref.h:65 [inline] config_item_put+0x45/0x60 fs/configfs/item.c:149 configfs_rmdir+0x6c9/0xbb0 fs/configfs/dir.c:1571 vfs_rmdir.part.0+0xe2/0x460 fs/namei.c:4157 vfs_rmdir fs/namei.c:4143 [inline] do_rmdir+0x2e8/0x3f0 fs/namei.c:4218 __do_sys_unlinkat fs/namei.c:4398 [inline] __se_sys_unlinkat fs/namei.c:4392 [inline] __x64_sys_unlinkat+0xad/0xe0 fs/namei.c:4392 x64_sys_call+0x2c1/0x990 arch/x86/include/generated/asm/syscalls_64.h:264 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x26/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd8/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 kvfree_call_rcu+0x98/0x860 kernel/rcu/tree.c:3648 mld_clear_delrec+0x1d7/0x350 net/ipv6/mcast.c:830 ipv6_mc_destroy_dev+0x3e/0x900 net/ipv6/mcast.c:2831 addrconf_ifdown.isra.0+0xef1/0x13f0 net/ipv6/addrconf.c:3952 addrconf_notify+0x31a/0x1260 net/ipv6/addrconf.c:3732 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x8e/0xd0 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2070 [inline] call_netdevice_notifiers_info net/core/dev.c:2055 [inline] call_netdevice_notifiers_extack net/core/dev.c:2082 [inline] call_netdevice_notifiers net/core/dev.c:2096 [inline] unregister_netdevice_many+0x7c9/0x14f0 net/core/dev.c:11176 default_device_exit_batch+0x3ca/0x500 net/core/dev.c:11709 ops_exit_list+0xde/0x130 net/core/net_namespace.c:177 cleanup_net+0x41f/0xb60 net/core/net_namespace.c:599 process_one_work+0x62c/0xec0 kernel/workqueue.c:2328 worker_thread+0x48e/0xdb0 kernel/workqueue.c:2475 kthread+0x324/0x3e0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff8881021af800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 28 bytes inside of 256-byte region [ffff8881021af800, ffff8881021af900) The buggy address belongs to the page: page:ffffea0004086b80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1021ae head:ffffea0004086b80 order:1 compound_mapcount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0004086680 0000000800000003 ffff888100042d80 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 69, ts 4944886952, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook mm/page_alloc.c:2607 [inline] prep_new_page+0x1a2/0x310 mm/page_alloc.c:2613 get_page_from_freelist+0x1ce2/0x30a0 mm/page_alloc.c:4487 __alloc_pages+0x300/0x2d60 mm/page_alloc.c:5824 __alloc_pages_node include/linux/gfp.h:595 [inline] alloc_pages_node include/linux/gfp.h:609 [inline] alloc_pages include/linux/gfp.h:622 [inline] alloc_slab_page mm/slub.c:1798 [inline] allocate_slab+0x39d/0x530 mm/slub.c:1937 new_slab mm/slub.c:2000 [inline] ___slab_alloc.constprop.0+0x3ca/0x890 mm/slub.c:3033 __slab_alloc.constprop.0+0x42/0x80 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc_trace+0x4a2/0x4e0 mm/slub.c:3272 kmalloc include/linux/slab.h:619 [inline] inode_doinit_use_xattr+0x52/0x2d0 security/selinux/hooks.c:1395 inode_doinit_with_dentry+0xcaa/0x15f0 security/selinux/hooks.c:1522 selinux_d_instantiate+0x17/0x20 security/selinux/hooks.c:6496 security_d_instantiate+0x47/0xc0 security/security.c:2075 d_splice_alias+0x70/0xb40 fs/dcache.c:3073 ext4_lookup fs/ext4/namei.c:1888 [inline] ext4_lookup+0x40f/0x6b0 fs/ext4/namei.c:1835 lookup_open fs/namei.c:3448 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x1196/0x4180 fs/namei.c:3747 do_filp_open+0x1ab/0x3f0 fs/namei.c:3777 do_open_execat+0xd2/0xc30 fs/exec.c:928 page_owner free stack trace missing Memory state around the buggy address: ffff8881021af700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881021af780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881021af800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881021af880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881021af900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================