ci2 starts bisection 2026-08-20 07:11:27.64608227 +0000 UTC m=+200988.312757914 bisecting fixing commit since 3feee789f44683df0030028bc3536a4f043b04cd building syzkaller on 79d68adabef23664d6fbd2cc314a7fef90391ccd ensuring issue is reproducible on original commit 3feee789f44683df0030028bc3536a4f043b04cd testing commit 3feee789f44683df0030028bc3536a4f043b04cd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 4f24a5682e64952a9e7ec9a261918a65d8e3b353007afc9e3ee9c476fcc75ae7 all runs: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode representative crash: KASAN: use-after-free Read in ext4_xattr_delete_inode, types: [KASAN-USE-AFTER-FREE-READ] 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 3feee789f44683df0030028bc3536a4f043b04cd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 62d48c9499a2b123b3fcb30b70dc39335552de9a63b510cc7108ebedb8a0f730 run #0: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #1: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #2: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #3: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_delete_inode run #4: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_delete_inode run #6: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #7: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #8: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #9: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode representative crash: KASAN: use-after-free Read in ext4_xattr_delete_inode, types: [KASAN-USE-AFTER-FREE-READ] 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=6018 leaves diff=242 split chunks (needed=false): <242> split chunk #0 of len 242 into 5 parts testing without sub-chunk 1/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 3feee789f44683df0030028bc3536a4f043b04cd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: f2248d77530107b52b959210aeb365394fa64b0ea23f1c458814f68ac7c344df all runs: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode representative crash: KASAN: use-after-free Read in ext4_xattr_delete_inode, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed testing commit 3feee789f44683df0030028bc3536a4f043b04cd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: e4351e688c67f0fb6a315f17c2e7f12324aff4c7b0d4656853a9d6ea13d1ef7d all runs: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode representative crash: KASAN: use-after-free Read in ext4_xattr_delete_inode, types: [KASAN-USE-AFTER-FREE-READ] 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 3feee789f44683df0030028bc3536a4f043b04cd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: cbcc2a93014856cecb7cf70fed52e68f484e82925b00b36aa7e687a2c17d5294 all runs: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode representative crash: KASAN: use-after-free Read in ext4_xattr_delete_inode, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 3feee789f44683df0030028bc3536a4f043b04cd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 660d1a78116226953c4524ae18e22d49b43d683c6a91c8c1034ec17d91634fa3 run #0: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #1: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_delete_inode run #2: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #3: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #4: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #5: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #6: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #7: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #8: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode run #9: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode representative crash: KASAN: use-after-free Read in ext4_xattr_delete_inode, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 3feee789f44683df0030028bc3536a4f043b04cd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building 3feee789f44683df0030028bc3536a4f043b04cd: net/socket.c:1128:(.text+0x1307): undefined reference to `wext_handle_ioctl' net/socket.c:3397:(.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 46 configs; suspects: [HID_ZEROPLUS 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 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 X86_X32 ZEROPLUS_FF] disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing current HEAD e334a66065d388b8f7c7b3fc17a23eff4181619e testing commit e334a66065d388b8f7c7b3fc17a23eff4181619e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: be6eafaea36365a2a779cc2b6ae8bab8eda2ceb460e986f897c5a68093bef95d all runs: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode representative crash: KASAN: use-after-free Read in ext4_xattr_delete_inode, types: [KASAN-USE-AFTER-FREE-READ] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 1h41m5.772343669s (build: 35m29.543035519s, test: 56m47.048823039s) crash still not fixed or there were kernel test errors commit msg: Merge 5.10.264 into android13-5.10-lts crash: KASAN: use-after-free Read in ext4_xattr_delete_inode ================================================================== BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xddd/0xe30 fs/ext4/xattr.c:2893 Read of size 4 at addr ffff88810ed5f000 by task syz-executor/483 CPU: 1 PID: 483 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 ext4_xattr_delete_inode+0xddd/0xe30 fs/ext4/xattr.c:2893 ext4_evict_inode+0x823/0x1650 fs/ext4/inode.c:302 evict+0x372/0x940 fs/inode.c:612 iput_final fs/inode.c:1736 [inline] iput.part.0+0x33b/0x640 fs/inode.c:1762 iput+0x3f/0x50 fs/inode.c:1752 d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir.part.0+0x303/0x3e0 fs/namei.c:3873 vfs_rmdir fs/namei.c:3846 [inline] do_rmdir+0x2b4/0x3a0 fs/namei.c:3920 __do_sys_unlinkat fs/namei.c:4084 [inline] __se_sys_unlinkat fs/namei.c:4078 [inline] __x64_sys_unlinkat+0xab/0xe0 fs/namei.c:4078 do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f65f7acd927 Code: 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 b8 07 01 00 00 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:00007fff4d52fae8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f65f7acd927 RDX: 0000000000000200 RSI: 00007fff4d530c90 RDI: 00000000ffffff9c RBP: 00007f65f7b4be43 R08: 0000000000018670 R09: 00000000ffffffff R10: 0000000000000100 R11: 0000000000000207 R12: 00007fff4d530c90 R13: 00007f65f7b4be43 R14: 000000000000910e R15: 00000000000090b5 Allocated by task 80: 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_slab_alloc+0x94/0xc0 mm/kasan/common.c:463 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 kmem_cache_alloc_node include/linux/slab.h:426 [inline] __alloc_skb+0x41/0x4d0 net/core/skbuff.c:200 alloc_skb include/linux/skbuff.h:1126 [inline] alloc_skb_with_frags+0x76/0x4a0 net/core/skbuff.c:6019 sock_alloc_send_pskb+0x69b/0x850 net/core/sock.c:2393 unix_dgram_sendmsg+0x339/0x1e50 net/unix/af_unix.c:1725 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg+0xb5/0xf0 net/socket.c:664 __sys_sendto+0x1e3/0x2f0 net/socket.c:2007 __do_sys_sendto net/socket.c:2019 [inline] __se_sys_sendto net/socket.c:2015 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:2015 do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 73: 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] kmem_cache_free+0x106/0x440 mm/slub.c:3224 kfree_skbmem+0x95/0x140 net/core/skbuff.c:638 __kfree_skb net/core/skbuff.c:695 [inline] consume_skb net/core/skbuff.c:851 [inline] consume_skb+0xae/0x1d0 net/core/skbuff.c:845 skb_free_datagram+0x12/0xd0 net/core/datagram.c:325 unix_dgram_recvmsg+0x6e9/0xce0 net/unix/af_unix.c:2233 sock_recvmsg_nosec net/socket.c:906 [inline] sock_recvmsg net/socket.c:924 [inline] sock_recvmsg net/socket.c:920 [inline] sock_read_iter+0x2da/0x510 net/socket.c:997 call_read_iter include/linux/fs.h:2060 [inline] new_sync_read+0x489/0x6d0 fs/read_write.c:415 vfs_read+0x2cf/0x430 fs/read_write.c:496 ksys_read+0x192/0x210 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x6e/0xb0 fs/read_write.c:642 do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88810ed5f000 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 0 bytes inside of 240-byte region [ffff88810ed5f000, ffff88810ed5f0f0) The buggy address belongs to the page: page:ffffea00043b57c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ed5f flags: 0x4000000000000200(slab) raw: 4000000000000200 0000000000000000 0000000c00000001 ffff888107fed680 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 98, ts 2756602419, free_ts 0 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+0x491/0x4f0 mm/slub.c:2965 kmem_cache_alloc_node include/linux/slab.h:426 [inline] __alloc_skb+0x41/0x4d0 net/core/skbuff.c:200 alloc_skb include/linux/skbuff.h:1126 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1178 [inline] netlink_sendmsg+0x8a4/0xd10 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg+0xb5/0xf0 net/socket.c:664 ____sys_sendmsg+0x694/0x990 net/socket.c:2377 ___sys_sendmsg+0xfc/0x190 net/socket.c:2431 __sys_sendmsg+0xc3/0x160 net/socket.c:2460 __do_sys_sendmsg net/socket.c:2469 [inline] __se_sys_sendmsg net/socket.c:2467 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2467 do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb page_owner free stack trace missing Memory state around the buggy address: ffff88810ed5ef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810ed5ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810ed5f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810ed5f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff88810ed5f100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================