ci2 starts bisection 2026-10-28 07:38:59.239994872 +0000 UTC m=+56467.115831434 bisecting fixing commit since e334a66065d388b8f7c7b3fc17a23eff4181619e building syzkaller on 1e72964b0111319984575e60f266d1fa0a98abb5 ensuring issue is reproducible on original commit e334a66065d388b8f7c7b3fc17a23eff4181619e testing commit e334a66065d388b8f7c7b3fc17a23eff4181619e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 377f0b8fe1bbb9667e6521461cfbc4a4093ca9f8a09785e7bb246d661b10ca32 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_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_put 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_get run #17: crashed: KASAN: use-after-free Write in config_item_get run #18: crashed: KASAN: use-after-free Write in config_item_put 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 [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit e334a66065d388b8f7c7b3fc17a23eff4181619e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 3ef8ae5c81b121dbee277b7be6798dfc6138e72834bbc0636be049d0a6ca0017 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_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: general protection fault in configfs_symlink 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 [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed kconfig minimization: base=4788 full=6024 leaves diff=248 split chunks (needed=false): <248> split chunk #0 of len 248 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 e334a66065d388b8f7c7b3fc17a23eff4181619e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: ef9823f8a16e7bbf95b8446d0c5bf512b69f5f044edbdee32ea14bddfc89d6c7 run #0: crashed: KASAN: use-after-free Write in config_item_put run #1: crashed: KASAN: use-after-free Write in config_item_put 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_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_put 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] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit e334a66065d388b8f7c7b3fc17a23eff4181619e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 05ea89c5fe442a79d5a3402cde8402455152d62059b3b246fab8d167ba9e8877 run #0: crashed: KASAN: use-after-free Write in config_item_get run #1: crashed: KASAN: use-after-free Write in config_item_put 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_get 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_put 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 3/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit e334a66065d388b8f7c7b3fc17a23eff4181619e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 810f1ffa3f0e7b1c969348734a4558fb44462080dfec82c5896fbed6e39eb1f3 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_get run #4: crashed: KASAN: use-after-free Write in config_item_put 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_get, types: [KASAN-USE-AFTER-FREE-WRITE] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit e334a66065d388b8f7c7b3fc17a23eff4181619e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 0c3ea9452dc484c340e0f62e23d612f367ff2ab9a5102bc876926c31c23aaf9d all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit e334a66065d388b8f7c7b3fc17a23eff4181619e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building e334a66065d388b8f7c7b3fc17a23eff4181619e: net/socket.c:1129:(.text+0x1307): undefined reference to `wext_handle_ioctl' net/socket.c:3398:(.text+0x17c7): undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:346:(.text+0x33b): undefined reference to `wext_proc_exit' net/core/net-procfs.c:330:(.text+0x4e2): undefined reference to `wext_proc_init' minimized to 98 configs; suspects: [HID_ZEROPLUS SND SOUND USB_CONFIGFS 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_EHCI_ROOT_HUB_TT 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 [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed testing current HEAD f61a392235e085addf6e809b78c6e6114320e6e7 testing commit f61a392235e085addf6e809b78c6e6114320e6e7 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 00590c4ac53057ab2e60ae6cec4b7379351d25dc4b127bf7f40fac91a2f86fe8 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_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_put, types: [KASAN-USE-AFTER-FREE-WRITE] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 2h38m31.563333103s (build: 1h19m45.357327165s, test: 43m49.898762701s) crash still not fixed or there were kernel test errors commit msg: Merge 5.10.272 into android13-5.10-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/asm-generic/atomic-instrumented.h:220 [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:151 Write of size 4 at addr ffff88811a70781c by task syz.2.373/1229 CPU: 0 PID: 1229 Comm: syz.2.373 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:77 [inline] dump_stack_lvl+0x81/0xac lib/dump_stack.c:118 print_address_description.constprop.0+0x24/0x160 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report.cold+0x82/0xdb mm/kasan/report.c:452 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/asm-generic/atomic-instrumented.h:220 [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:151 configfs_symlink+0x3b0/0xe80 fs/configfs/symlink.c:212 vfs_symlink fs/namei.c:4149 [inline] vfs_symlink+0x38a/0x5b0 fs/namei.c:4135 do_symlinkat+0x125/0x220 fs/namei.c:4176 __do_sys_symlinkat fs/namei.c:4190 [inline] __se_sys_symlinkat fs/namei.c:4187 [inline] __x64_sys_symlinkat+0x6e/0xb0 fs/namei.c:4187 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f0bac7530d9 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:00007f0bac5b4028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007f0bac9dafa0 RCX: 00007f0bac7530d9 RDX: 00002000000002c0 RSI: ffffffffffffff9c RDI: 0000200000000280 RBP: 00007f0bac7ea024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0bac9db038 R14: 00007f0bac9dafa0 R15: 00007ffe2dec3a78 Allocated by task 1230: 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:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] ____kasan_kmalloc mm/kasan/common.c:468 [inline] __kasan_kmalloc+0xae/0xe0 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0xa9/0x500 mm/slub.c:2979 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:667 [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:636 configfs_mkdir+0x485/0x1090 fs/configfs/dir.c:1378 vfs_mkdir+0x463/0x700 fs/namei.c:3840 do_mkdirat+0x12a/0x290 fs/namei.c:3862 __do_sys_mkdirat fs/namei.c:3873 [inline] __se_sys_mkdirat fs/namei.c:3871 [inline] __x64_sys_mkdirat+0x71/0xb0 fs/namei.c:3871 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 1230: 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:362 [inline] ____kasan_slab_free mm/kasan/common.c:324 [inline] __kasan_slab_free+0x111/0x150 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+0x9b/0x1a0 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kfree+0xc2/0x4e0 mm/slub.c:4196 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:130 config_item_release fs/configfs/item.c:139 [inline] kref_put include/linux/kref.h:65 [inline] config_item_put+0x45/0x60 fs/configfs/item.c:151 configfs_rmdir+0x731/0x9e0 fs/configfs/dir.c:1604 vfs_rmdir.part.0+0xdf/0x3e0 fs/namei.c:3902 vfs_rmdir fs/namei.c:3888 [inline] do_rmdir+0x2b4/0x3a0 fs/namei.c:3962 __do_sys_unlinkat fs/namei.c:4126 [inline] __se_sys_unlinkat fs/namei.c:4120 [inline] __x64_sys_unlinkat+0xab/0xe0 fs/namei.c:4120 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88811a707800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 28 bytes inside of 256-byte region [ffff88811a707800, ffff88811a707900) The buggy address belongs to the page: page:ffffea000469c180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a706 head:ffffea000469c180 order:1 compound_mapcount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea00044c7a80 0000000b0000000b ffff888100043200 raw: 0000000000000000 0000000000100010 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 613, ts 38624100235, free_ts 38390229572 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page mm/page_alloc.c:2462 [inline] get_page_from_freelist+0x1fee/0x2ad0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x2ae/0x2540 mm/page_alloc.c:5384 __alloc_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] alloc_slab_page mm/slub.c:1670 [inline] allocate_slab+0x30f/0x460 mm/slub.c:1813 new_slab mm/slub.c:1874 [inline] new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc.constprop.0+0x32b/0x730 mm/slub.c:2796 __slab_alloc mm/slub.c:2836 [inline] slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc_trace+0x4a2/0x500 mm/slub.c:2977 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:667 [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:636 configfs_mkdir+0x485/0x1090 fs/configfs/dir.c:1378 vfs_mkdir+0x463/0x700 fs/namei.c:3840 do_mkdirat+0x12a/0x290 fs/namei.c:3862 __do_sys_mkdirat fs/namei.c:3873 [inline] __se_sys_mkdirat fs/namei.c:3871 [inline] __x64_sys_mkdirat+0x71/0xb0 fs/namei.c:3871 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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_pcp_prepare+0x1a7/0x230 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3336 [inline] free_unref_page+0x19/0x270 mm/page_alloc.c:3391 free_the_page mm/page_alloc.c:5443 [inline] __free_pages+0xba/0xf0 mm/page_alloc.c:5454 __free_slab+0xde/0x1d0 mm/slub.c:1899 free_slab mm/slub.c:1914 [inline] discard_slab+0x2b/0x40 mm/slub.c:1920 unfreeze_partials+0x1e1/0x240 mm/slub.c:2415 put_cpu_partial+0xce/0x120 mm/slub.c:2451 __slab_free+0x23f/0x560 mm/slub.c:3100 do_slab_free mm/slub.c:3196 [inline] ___cache_free+0x255/0x2b0 mm/slub.c:3215 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x71/0x150 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15f/0x1c0 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xaa/0xc0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook mm/slab.h:580 [inline] slab_alloc_node mm/slub.c:2952 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc+0x15d/0x4f0 mm/slub.c:2965 getname_flags.part.0+0x4d/0x480 fs/namei.c:141 getname_flags include/linux/audit.h:328 [inline] user_path_at_empty+0x8e/0xf0 fs/namei.c:2790 user_path_at include/linux/namei.h:60 [inline] ksys_umount fs/namespace.c:1768 [inline] __do_sys_umount fs/namespace.c:1776 [inline] __se_sys_umount fs/namespace.c:1774 [inline] __x64_sys_umount+0xbe/0x120 fs/namespace.c:1774 Memory state around the buggy address: ffff88811a707700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811a707780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811a707800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811a707880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811a707900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================