ci2 starts bisection 2026-04-09 06:15:50.935263859 +0000 UTC m=+16234.785637916 bisecting fixing commit since e8b14e1cefe8a3049a46a48685bf937ca244949d building syzkaller on 41d2fa6acff3c67933b109c27d013d1ad890115c ensuring issue is reproducible on original commit e8b14e1cefe8a3049a46a48685bf937ca244949d testing commit e8b14e1cefe8a3049a46a48685bf937ca244949d gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: d7707e7fe065372f762cbcd6c7778a2b2583993dd7a3241186d94e0c313eb2c5 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 [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed testing commit e8b14e1cefe8a3049a46a48685bf937ca244949d gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 30a63e67f5df2728f465f42932a7217b10ca9614e141c8f6491e7470ee75620a 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 [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed kconfig minimization: base=4788 full=6025 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 [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed testing commit e8b14e1cefe8a3049a46a48685bf937ca244949d gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 81fc13048a9b8d26ea8fc1ad8c36d70b8459e226ffddaae8835c54b481d9ab91 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 [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed testing commit e8b14e1cefe8a3049a46a48685bf937ca244949d gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 2d94964c8b7398cb0e3318c97835210107fc5682ac8634b2ca6c017ad79ee31d 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 3/5 disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed testing commit e8b14e1cefe8a3049a46a48685bf937ca244949d gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 175fd2805220dda1d5acda5492d8ca869a2b0faf4a764364ada2aa630b6a0ba3 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] 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 e8b14e1cefe8a3049a46a48685bf937ca244949d gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 0dff58f823f0edd46773127515e256b6e99cbba24788f55edfc0c739aeea9e21 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 5/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit e8b14e1cefe8a3049a46a48685bf937ca244949d gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building e8b14e1cefe8a3049a46a48685bf937ca244949d: 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 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 [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing current HEAD cc0ae2abdc73d5432c9a86d8576c344c68a1e29c testing commit cc0ae2abdc73d5432c9a86d8576c344c68a1e29c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: c13c55302ed917e2011c3fc551799b570e840e56e8a9873ea0a5d4be24fc8712 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: slab-out-of-bounds 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: 1h10m41.082184213s (build: 33m46.093506657s, test: 35m6.481880325s) crash still not fixed or there were kernel test errors commit msg: Merge android13-5.10 into android13-5.10-lts crash: KASAN: use-after-free Read in xattr_find_entry EXT4-fs (loop2): Ignoring removed orlov option EXT4-fs (loop2): mounted filesystem without journal. Opts: block_validity,bsddf,nombcache,inode_readahead_blks=0x0000000000000000,debug_want_extra_isize=0x0000000000000080,orlov,nogrpid,noauto_da_alloc,grpjquota=,,errors=continue ================================================================== BUG: KASAN: use-after-free in xattr_find_entry+0x237/0x260 fs/ext4/xattr.c:294 Read of size 4 at addr ffff888110dba004 by task syz.2.19/459 CPU: 1 PID: 459 Comm: syz.2.19 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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+0x644/0x1f50 fs/ext4/inode.c:5722 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: 0033:0x7f2b61257629 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:00007f2b610ba028 EFLAGS: 00000246 ORIG_RAX: 000000000000010c RAX: ffffffffffffffda RBX: 00007f2b614d0fa0 RCX: 00007f2b61257629 RDX: 000000000000017f RSI: 0000200000000300 RDI: ffffffffffffff9c RBP: 00007f2b612edb39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2b614d1038 R14: 00007f2b614d0fa0 R15: 00007ffc3b03d328 Allocated by task 444: 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] call_modprobe kernel/kmod.c:79 [inline] __request_module+0x1e2/0x640 kernel/kmod.c:170 __rtnl_newlink+0x66b/0x14e0 net/core/rtnetlink.c:3433 rtnl_newlink+0x5f/0x90 net/core/rtnetlink.c:3530 rtnetlink_rcv_msg+0x334/0x970 net/core/rtnetlink.c:5610 netlink_rcv_skb+0x133/0x3c0 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:5628 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x642/0xad0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x815/0xd10 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg+0xb5/0xf0 net/socket.c:664 __sys_sendto+0x1e3/0x2f0 net/socket.c:2006 __do_sys_sendto net/socket.c:2018 [inline] __se_sys_sendto net/socket.c:2014 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:2014 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 444: 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 free_modprobe_argv+0x6f/0xa0 kernel/kmod.c:66 call_usermodehelper_freeinfo kernel/umh.c:44 [inline] call_usermodehelper_exec+0x1f0/0x460 kernel/umh.c:452 call_modprobe kernel/kmod.c:98 [inline] __request_module+0x309/0x640 kernel/kmod.c:170 __rtnl_newlink+0x66b/0x14e0 net/core/rtnetlink.c:3433 rtnl_newlink+0x5f/0x90 net/core/rtnetlink.c:3530 rtnetlink_rcv_msg+0x334/0x970 net/core/rtnetlink.c:5610 netlink_rcv_skb+0x133/0x3c0 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:5628 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x642/0xad0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x815/0xd10 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg+0xb5/0xf0 net/socket.c:664 __sys_sendto+0x1e3/0x2f0 net/socket.c:2006 __do_sys_sendto net/socket.c:2018 [inline] __se_sys_sendto net/socket.c:2014 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:2014 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 ffff888110dba000 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 4 bytes inside of 64-byte region [ffff888110dba000, ffff888110dba040) The buggy address belongs to the page: page:ffffea0004436e80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110dba flags: 0x4000000000000200(slab) raw: 4000000000000200 ffffea0004436c40 0000000400000004 ffff888100043800 raw: 0000000000000000 0000000000200020 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 104, ts 3378837689, 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_trace+0x4a2/0x500 mm/slub.c:2977 kmalloc include/linux/slab.h:555 [inline] kernfs_get_open_node fs/kernfs/file.c:552 [inline] kernfs_fop_open+0x7e5/0xbc0 fs/kernfs/file.c:698 do_dentry_open+0x412/0x1010 fs/open.c:819 vfs_open+0x9a/0xc0 fs/open.c:944 do_open fs/namei.c:3399 [inline] path_openat+0x1e4e/0x3950 fs/namei.c:3517 do_filp_open+0x193/0x3d0 fs/namei.c:3544 do_sys_openat2+0x135/0x810 fs/open.c:1219 do_sys_open fs/open.c:1235 [inline] __do_sys_openat fs/open.c:1251 [inline] __se_sys_openat fs/open.c:1246 [inline] __x64_sys_openat+0x124/0x200 fs/open.c:1246 do_syscall_64+0x32/0x50 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: ffff888110db9f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888110db9f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888110dba000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888110dba080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888110dba100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== EXT4-fs error (device loop2): xattr_find_entry:297: inode #12: comm syz.2.19: corrupted xattr entries