ci2 starts bisection 2026-08-22 16:17:00.037397961 +0000 UTC m=+406520.704073575 bisecting fixing commit since 50b3a256e550e98ff6a49d32e77fb67998707961 building syzkaller on 7f27c57affd8bddc0f76bd42d53ecfc583fc548b ensuring issue is reproducible on original commit 50b3a256e550e98ff6a49d32e77fb67998707961 testing commit 50b3a256e550e98ff6a49d32e77fb67998707961 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 94d8acaa9bb8f25701e7fd569ab365b66175b7bff0a69262c7ed05101fee26d8 all runs: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, 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 50b3a256e550e98ff6a49d32e77fb67998707961 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: fd9762e0a5f10aed441c3048c29d2c5d8db8396e9a6626d673a0e59e43973b39 all runs: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, types: [KASAN-USE-AFTER-FREE-READ] the bug reproduces without the instrumentation disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], 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 50b3a256e550e98ff6a49d32e77fb67998707961 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: ad3d6e620202befdffa84abb6acbd723020612d5bab6e57d59c2e28316c39af4 all runs: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit 50b3a256e550e98ff6a49d32e77fb67998707961 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 66bd4136580ba2416adf80380eb357cfd33318a467873dcec30cad66eb2b3047 run #0: crashed: KASAN: use-after-free Read in xattr_find_entry run #1: crashed: KASAN: slab-out-of-bounds Read in xattr_find_entry run #2: crashed: KASAN: use-after-free Read in xattr_find_entry run #3: crashed: KASAN: use-after-free Read in xattr_find_entry run #4: crashed: KASAN: use-after-free Read in xattr_find_entry run #5: crashed: KASAN: use-after-free Read in xattr_find_entry run #6: crashed: KASAN: use-after-free Read in xattr_find_entry run #7: crashed: KASAN: use-after-free Read in xattr_find_entry run #8: crashed: KASAN: use-after-free Read in xattr_find_entry run #9: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, 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 50b3a256e550e98ff6a49d32e77fb67998707961 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: f288b01a2d16adaf250b34ab2791d6542a5d3f2725c89c4f6a1fe5049da74044 all runs: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, types: [KASAN-USE-AFTER-FREE-READ] 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 50b3a256e550e98ff6a49d32e77fb67998707961 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: c2ab5a5c629ab527a4ddd67d232971519878af846ca128e9041a483834964b0e run #0: crashed: KASAN: use-after-free Read in xattr_find_entry run #1: crashed: KASAN: use-after-free Read in xattr_find_entry run #2: crashed: KASAN: use-after-free Read in xattr_find_entry run #3: crashed: KASAN: use-after-free Read in xattr_find_entry run #4: crashed: KASAN: use-after-free Read in xattr_find_entry run #5: crashed: KASAN: use-after-free Read in xattr_find_entry run #6: crashed: KASAN: use-after-free Read in xattr_find_entry run #7: crashed: KASAN: use-after-free Read in xattr_find_entry run #8: crashed: KASAN: slab-out-of-bounds Read in xattr_find_entry run #9: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 50b3a256e550e98ff6a49d32e77fb67998707961 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building 50b3a256e550e98ff6a49d32e77fb67998707961: 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 48 configs; suspects: [HID_ZEROPLUS 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 [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: 3d44dd7a66e479e1a9641f0e73c165c64ddcaf0e040c79b08b309c76b2e884d9 run #0: crashed: KASAN: use-after-free Read in xattr_find_entry run #1: crashed: KASAN: use-after-free Read in xattr_find_entry run #2: crashed: KASAN: slab-out-of-bounds Read in xattr_find_entry run #3: crashed: KASAN: use-after-free Read in xattr_find_entry run #4: crashed: KASAN: use-after-free Read in xattr_find_entry run #5: crashed: KASAN: use-after-free Read in xattr_find_entry run #6: crashed: KASAN: use-after-free Read in xattr_find_entry run #7: crashed: KASAN: use-after-free Read in xattr_find_entry run #8: crashed: KASAN: use-after-free Read in xattr_find_entry run #9: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, types: [KASAN-USE-AFTER-FREE-READ] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 2h24m43.566448306s (build: 1h26m34.957412945s, test: 39m8.387283131s) 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 xattr_find_entry EXT4-fs (loop2): mounted filesystem without journal. Opts: block_validity,errors=remount-ro,sysvgroups,norecovery,debug_want_extra_isize=0x0000000000000080,grpjquota=,nogrpid,noauto_da_alloc,norecovery, ================================================================== BUG: KASAN: use-after-free in xattr_find_entry+0x237/0x260 fs/ext4/xattr.c:294 Read of size 4 at addr ffff888113f99004 by task syz.2.20/490 CPU: 1 PID: 490 Comm: syz.2.20 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 xattr_find_entry+0x237/0x260 fs/ext4/xattr.c:294 ext4_xattr_ibody_get+0x241/0x500 fs/ext4/xattr.c:601 ext4_xattr_get+0x149/0xa00 fs/ext4/xattr.c:655 ext4_get_acl+0x42/0x590 fs/ext4/acl.c:162 get_acl.part.0+0xae/0x1e0 fs/posix_acl.c:141 get_acl fs/posix_acl.c:112 [inline] posix_acl_chmod fs/posix_acl.c:565 [inline] posix_acl_chmod+0x180/0x350 fs/posix_acl.c:555 ext4_setattr+0x62c/0x2040 fs/ext4/inode.c:5741 notify_change+0x7b0/0xd90 fs/attr.c:410 chmod_common+0x1ca/0x400 fs/open.c:584 do_fchmodat+0xa4/0x110 fs/open.c:622 __do_sys_fchmodat fs/open.c:635 [inline] __se_sys_fchmodat fs/open.c:632 [inline] __x64_sys_fchmodat+0x71/0xb0 fs/open.c:632 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7efc80349e99 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:00007efc801ab028 EFLAGS: 00000246 ORIG_RAX: 000000000000010c RAX: ffffffffffffffda RBX: 00007efc805d1fa0 RCX: 00007efc80349e99 RDX: 00000000ffffff50 RSI: 0000200000000300 RDI: ffffffffffffff9c RBP: 00007efc803dfeaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efc805d2038 R14: 00007efc805d1fa0 R15: 00007ffdb00f5308 Allocated by task 425: 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 vm_area_dup+0x86/0x420 kernel/fork.c:366 __split_vma+0x8a/0x410 mm/mmap.c:2872 __do_munmap+0x233/0x1000 mm/mmap.c:2989 __vm_munmap+0xfb/0x1a0 mm/mmap.c:3094 __do_sys_munmap mm/mmap.c:3120 [inline] __se_sys_munmap mm/mmap.c:3116 [inline] __x64_sys_munmap+0x62/0x80 mm/mmap.c:3116 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 425: 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 vm_area_free+0x6d/0x190 kernel/fork.c:386 __free_vma mm/mmap.c:180 [inline] put_vma+0x64/0x80 mm/mmap.c:187 remove_vma mm/mmap.c:205 [inline] remove_vma_list mm/mmap.c:2770 [inline] __do_munmap+0x57f/0x1000 mm/mmap.c:3044 __vm_munmap+0xfb/0x1a0 mm/mmap.c:3094 __do_sys_munmap mm/mmap.c:3120 [inline] __se_sys_munmap mm/mmap.c:3116 [inline] __x64_sys_munmap+0x62/0x80 mm/mmap.c:3116 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 ffff888113f99000 which belongs to the cache vm_area_struct of size 232 The buggy address is located 4 bytes inside of 232-byte region [ffff888113f99000, ffff888113f990e8) The buggy address belongs to the page: page:ffffea00044fe640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113f99 flags: 0x4000000000000200(slab) raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100160780 raw: 0000000000000000 00000000000d000d 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 425, ts 38964922513, free_ts 38909101956 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 vm_area_dup+0x86/0x420 kernel/fork.c:366 __split_vma+0x8a/0x410 mm/mmap.c:2872 __do_munmap+0x233/0x1000 mm/mmap.c:2989 __vm_munmap+0xfb/0x1a0 mm/mmap.c:3094 __do_sys_munmap mm/mmap.c:3120 [inline] __se_sys_munmap mm/mmap.c:3116 [inline] __x64_sys_munmap+0x62/0x80 mm/mmap.c:3116 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_pages_ok+0x44b/0x840 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5445 [inline] __free_pages+0xda/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] getname fs/namei.c:212 [inline] __do_sys_unlink fs/namei.c:4090 [inline] __se_sys_unlink fs/namei.c:4088 [inline] __x64_sys_unlink+0x98/0xe0 fs/namei.c:4088 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff888113f98f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888113f98f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888113f99000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888113f99080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff888113f99100: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb ================================================================== EXT4-fs error (device loop2): xattr_find_entry:297: inode #12: comm syz.2.20: corrupted xattr entries EXT4-fs (loop2): Remounting filesystem read-only