ci2 starts bisection 2026-08-19 05:03:35.658809281 +0000 UTC m=+106916.325484905
bisecting fixing commit since 50b3a256e550e98ff6a49d32e77fb67998707961
building syzkaller on 2130f682322a1c2ef698e3c27a2b97e89e96142f
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: c24782f87902a425882f868a8001a313b195edfd0b3a9163fc8675b0c0a7123f
run #0: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_list_entries
run #1: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #2: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #3: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #4: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_list_entries
run #5: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #6: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #7: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_list_entries
run #8: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #9: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #10: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #11: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #12: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #13: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #14: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #15: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_list_entries
run #16: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #17: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #18: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_list_entries
run #19: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
representative crash: KASAN: use-after-free Read in ext4_xattr_list_entries, types: [KASAN-USE-AFTER-FREE-READ]
check whether we can drop unnecessary instrumentation
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: 67b9f505e08f628cef18cfb9e23b5cf23933c27a15daa76f8a1b0e068cf0a99d
run #0: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #1: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #2: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #3: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #4: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_list_entries
run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_list_entries
run #6: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #7: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #8: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #9: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
representative crash: KASAN: use-after-free Read in ext4_xattr_list_entries, 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=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: 32b01d7df067f11fb70479f0968b3f14b2b109c6741bcf0a16d6a011b5b58688
all runs: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
representative crash: KASAN: use-after-free Read in ext4_xattr_list_entries, 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 50b3a256e550e98ff6a49d32e77fb67998707961 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: ab7c946403e7255f3b96086ed30ba6643d9c68c6a4f6a74c6036180303f9e5e9
run #0: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #1: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #2: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #3: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #4: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #5: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #6: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_list_entries
run #7: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #8: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #9: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
representative crash: KASAN: use-after-free Read in ext4_xattr_list_entries, types: [KASAN-USE-AFTER-FREE-READ]
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 50b3a256e550e98ff6a49d32e77fb67998707961 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 4054b0c2170286e31f18a7109e6d634404a339be9dce11068e4aae7c49e6601d
run #0: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #1: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #2: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_list_entries
run #3: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #4: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #5: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #6: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #7: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #8: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #9: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
representative crash: KASAN: use-after-free Read in ext4_xattr_list_entries, 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 50b3a256e550e98ff6a49d32e77fb67998707961 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: c654b17d23020d8120496a90c79437172d041b157daba1a93bd57098d6387cc7
run #0: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_list_entries
run #1: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #2: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #3: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #4: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #5: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #6: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #7: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #8: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #9: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
representative crash: KASAN: use-after-free Read in ext4_xattr_list_entries, 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 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 [locking atomic_sleep hang memleak ubsan bug_or_warning], 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: 5dfa4360c8455bed4779ea335f70cba3b2a77f866fe16a96dd6d0daf2683340c
run #0: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #1: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #2: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #3: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #4: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #5: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #6: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #7: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #8: crashed: KASAN: use-after-free Read in ext4_xattr_list_entries
run #9: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_list_entries
representative crash: KASAN: use-after-free Read in ext4_xattr_list_entries, types: [KASAN-USE-AFTER-FREE-READ]
crash still not fixed/happens on the oldest tested release
revisions tested: 7, total time: 1h31m14.980288503s (build: 37m49.732970571s, test: 42m20.434310924s)
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_list_entries
EXT4-fs (loop2): Ignoring removed oldalloc option
EXT4-fs (loop2): Ignoring removed mblk_io_submit option
EXT4-fs (loop2): encrypted files will use data=ordered instead of data journaling mode
EXT4-fs (loop2): 1 truncate cleaned up
EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,mblk_io_submit,mblk_io_submit,resgid=0x0000000000000000,oldalloc,mblk_io_submit,nogrpid,
==================================================================
BUG: KASAN: use-after-free in ext4_xattr_list_entries+0x2d0/0x370 fs/ext4/xattr.c:670
Read of size 4 at addr ffff8881133b5018 by task syz.2.19/487

CPU: 0 PID: 487 Comm: syz.2.19 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_list_entries+0x2d0/0x370 fs/ext4/xattr.c:670
 ext4_xattr_ibody_list fs/ext4/xattr.c:740 [inline]
 ext4_listxattr+0x3dd/0xae0 fs/ext4/xattr.c:765
 vfs_listxattr+0xd4/0x140 fs/xattr.c:420
 listxattr+0x5c/0xf0 fs/xattr.c:715
 path_listxattr+0xae/0x110 fs/xattr.c:739
 __do_sys_listxattr fs/xattr.c:751 [inline]
 __se_sys_listxattr fs/xattr.c:748 [inline]
 __x64_sys_listxattr+0x73/0xb0 fs/xattr.c:748
 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7eff59107e59
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:00007eff58f69028 EFLAGS: 00000246 ORIG_RAX: 00000000000000c2
RAX: ffffffffffffffda RBX: 00007eff5938ffa0 RCX: 00007eff59107e59
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007eff5919de6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007eff59390038 R14: 00007eff5938ffa0 R15: 00007fff1b4f36e8

Allocated by task 426:
 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_alloc+0x1c/0x160 kernel/fork.c:358
 __mmap_region mm/mmap.c:1859 [inline]
 mmap_region+0x730/0x11d0 mm/mmap.c:3075
 do_mmap+0x5ca/0x1160 mm/mmap.c:1661
 vm_mmap_pgoff+0x14a/0x2f0 mm/util.c:543
 ksys_mmap_pgoff+0x47/0x180 mm/mmap.c:1712
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __x64_sys_mmap+0xed/0x1a0 arch/x86/kernel/sys_x86_64.c:86
 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 426:
 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
 __vma_adjust+0x724/0x1a10 mm/mmap.c:1017
 __vma_merge+0x242/0x13a0 mm/mmap.c:1303
 vma_merge include/linux/mm.h:2717 [inline]
 mprotect_fixup+0x2c8/0x880 mm/mprotect.c:456
 do_mprotect_pkey+0x3b6/0x750 mm/mprotect.c:622
 __do_sys_mprotect mm/mprotect.c:647 [inline]
 __se_sys_mprotect mm/mprotect.c:644 [inline]
 __x64_sys_mprotect+0x73/0xb0 mm/mprotect.c:644
 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 ffff8881133b5000
 which belongs to the cache vm_area_struct of size 232
The buggy address is located 24 bytes inside of
 232-byte region [ffff8881133b5000, ffff8881133b50e8)
The buggy address belongs to the page:
page:ffffea00044ced40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1133b5
flags: 0x4000000000000200(slab)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100160c00
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 426, ts 36814933832, free_ts 36774362181
 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_alloc+0x1c/0x160 kernel/fork.c:358
 __mmap_region mm/mmap.c:1859 [inline]
 mmap_region+0x730/0x11d0 mm/mmap.c:3075
 do_mmap+0x5ca/0x1160 mm/mmap.c:1661
 vm_mmap_pgoff+0x14a/0x2f0 mm/util.c:543
 ksys_mmap_pgoff+0x47/0x180 mm/mmap.c:1712
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __x64_sys_mmap+0xed/0x1a0 arch/x86/kernel/sys_x86_64.c:86
 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
 __vunmap+0x4b7/0x7d0 mm/vmalloc.c:2307
 free_work+0x51/0x70 mm/vmalloc.c:69
 process_one_work+0x5f5/0xe40 kernel/workqueue.c:2301
 worker_thread+0x402/0xcd0 kernel/workqueue.c:2447
 kthread+0x345/0x420 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Memory state around the buggy address:
 ffff8881133b4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881133b4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881133b5000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff8881133b5080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
 ffff8881133b5100: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
==================================================================