ci2 starts bisection 2026-09-27 16:52:52.785020429 +0000 UTC m=+138174.108332928 bisecting fixing commit since 92668decd5e08edc7a6c138256abd2c37c4970f2 building syzkaller on 1e72964b0111319984575e60f266d1fa0a98abb5 ensuring issue is reproducible on original commit 92668decd5e08edc7a6c138256abd2c37c4970f2 testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 6d8c7d25d56afc58a3fe22231b84ecf4371750a4f25a0e4e091cfdab1cb61639 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 run #10: crashed: KASAN: use-after-free Write in config_item_get run #11: crashed: KASAN: use-after-free Write in config_item_put 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_get 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 [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 6215d1755810380238fa17b8868f4063bf4d31ecf8ea3714550685a4bcfd707a 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_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_put run #8: crashed: KASAN: use-after-free Write in config_item_put 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 [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed kconfig minimization: base=5186 full=6558 leaves diff=267 split chunks (needed=false): <267> split chunk #0 of len 267 into 5 parts testing without sub-chunk 1/5 disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 97b29707e51340645cbbdea653f4e1ef77e32e78c19bd42ad0f0d795303cd398 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_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_get, 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 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 6a50b31da1da4265f5f3ecc5e9a37d76e63d5d4df07613ac71810de600b1f0d8 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_get run #3: crashed: KASAN: use-after-free Write in config_item_put 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 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 [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 1daa69c779356547dd5303533bb1bc2574e7a1ab23006dbaa704eec245ba9eaf 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_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_put 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 4/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 0f3abf9163994059d39810f5282ebda9b3400fb212337a6f089877a0946bbcfa all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 failed building 92668decd5e08edc7a6c138256abd2c37c4970f2: ld.lld: error: undefined symbol: wext_proc_init ld.lld: error: undefined symbol: wext_proc_exit ld.lld: error: undefined symbol: wext_handle_ioctl ld.lld: error: undefined symbol: compat_wext_handle_ioctl minimized to 105 configs; suspects: [COMMON_CLK HAVE_CLK HID_ZEROPLUS SND SOUND USB_ARMLINUX 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_DWC3_OF_SIMPLE 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_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 V4L2_ASYNC V4L2_FWNODE VIDEO_CAMERA_SENSOR WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_PURELIFI WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_SILABS WLAN_VENDOR_ZYDAS ZEROPLUS_FF] disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed testing current HEAD 3d4bd33f0b0bedded31a9d7491d6b20d818e29c7 testing commit 3d4bd33f0b0bedded31a9d7491d6b20d818e29c7 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 1baaf36e46532086e22a76cd88eaad037bd94a607697880e43d9002bb3916010 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: 1h43m37.633755512s (build: 28m58.946336515s, test: 54m26.582419661s) crash still not fixed or there were kernel test errors commit msg: Merge tag 'android14-6.1.177_r00' into android14-6.1 crash: KASAN: use-after-free Write in config_item_put ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline] BUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [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+0x2b/0x180 fs/configfs/item.c:149 Write of size 4 at addr ffff888109a37824 by task syz.5.84/621 CPU: 1 PID: 621 Comm: syz.5.84 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x19/0x1c lib/dump_stack.c:88 dump_stack_lvl+0xcc/0x11c lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:102 [inline] atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [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+0x2b/0x180 fs/configfs/item.c:149 configfs_symlink+0x50a/0x1080 fs/configfs/symlink.c:212 vfs_symlink+0x1ea/0x340 fs/namei.c:4478 do_symlinkat+0x120/0x510 fs/namei.c:4507 __do_sys_symlinkat fs/namei.c:4524 [inline] __se_sys_symlinkat fs/namei.c:4521 [inline] __x64_sys_symlinkat+0x94/0xa0 fs/namei.c:4521 x64_sys_call+0x282/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:267 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f67a739e0d9 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:00007f67a82a2028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007f67a7625fa0 RCX: 00007f67a739e0d9 RDX: 0000200000000300 RSI: ffffffffffffff9c RDI: 0000200000000200 RBP: 00007f67a7435024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f67a7626038 R14: 00007f67a7625fa0 R15: 00007ffff9723af8 Allocated by task 618: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:380 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:212 [inline] kmalloc_trace+0x40/0xb0 mm/slab_common.c:1033 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] fsg_alloc_inst+0x5c/0x550 drivers/usb/gadget/function/f_mass_storage.c:3504 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xf3/0x2d0 drivers/usb/gadget/functions.c:44 function_make+0x102/0x320 drivers/usb/gadget/configfs.c:652 configfs_mkdir+0x4ae/0x910 fs/configfs/dir.c:1329 vfs_mkdir+0x2cc/0x460 fs/namei.c:4113 do_mkdirat+0x13a/0x420 fs/namei.c:4138 __do_sys_mkdirat fs/namei.c:4153 [inline] __se_sys_mkdirat fs/namei.c:4151 [inline] __x64_sys_mkdirat+0x84/0x90 fs/namei.c:4151 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 617: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1750 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776 slab_free mm/slub.c:3712 [inline] __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728 kfree+0x6f/0xf0 mm/slab_common.c:990 fsg_free_inst+0x2a2/0x3a0 drivers/usb/gadget/function/f_mass_storage.c:3495 usb_put_function_instance+0x91/0xa0 drivers/usb/gadget/functions.c:77 fsg_attr_release+0x9/0x10 drivers/usb/gadget/function/f_mass_storage.c:3381 config_item_cleanup fs/configfs/item.c:128 [inline] config_item_release fs/configfs/item.c:137 [inline] kref_put include/linux/kref.h:65 [inline] config_item_put+0x134/0x180 fs/configfs/item.c:149 configfs_rmdir+0x84c/0x900 fs/configfs/dir.c:1540 vfs_rmdir+0x19e/0x3f0 fs/namei.c:4198 do_rmdir+0x1ec/0x5a0 fs/namei.c:4259 __do_sys_rmdir fs/namei.c:4278 [inline] __se_sys_rmdir fs/namei.c:4276 [inline] __x64_sys_rmdir+0x44/0x50 fs/namei.c:4276 x64_sys_call+0x68e/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:85 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888109a37800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 36 bytes inside of 512-byte region [ffff888109a37800, ffff888109a37a00) The buggy address belongs to the physical page: page:ffffea0004268d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109a34 head:ffffea0004268d00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042f00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 1980647437, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook mm/page_alloc.c:2673 [inline] prep_new_page+0x594/0x660 mm/page_alloc.c:2680 get_page_from_freelist+0x304b/0x30c0 mm/page_alloc.c:4587 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x7c/0x360 mm/slub.c:2020 ___slab_alloc+0x5ee/0x990 mm/slub.c:3177 __slab_alloc+0x53/0x90 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc_node_track_caller+0x93/0x180 mm/slab_common.c:958 kmalloc_reserve net/core/skbuff.c:449 [inline] pskb_expand_head+0x169/0xfd0 net/core/skbuff.c:1852 netlink_trim+0x12d/0x1b0 net/netlink/af_netlink.c:1300 netlink_broadcast+0x61/0xe20 net/netlink/af_netlink.c:1506 nlmsg_multicast include/net/netlink.h:1067 [inline] genlmsg_multicast_netns include/net/genetlink.h:336 [inline] genl_ctrl_event+0x544/0x8e0 net/netlink/genetlink.c:1151 genl_register_family+0xb8e/0xec0 net/netlink/genetlink.c:457 nfc_genl_init+0x11/0x28 net/nfc/netlink.c:1914 nfc_init+0x42/0x9c net/nfc/core.c:1224 page_owner free stack trace missing Memory state around the buggy address: ffff888109a37700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888109a37780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888109a37800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888109a37880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888109a37900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================