ci2 starts bisection 2026-10-24 18:24:53.927727023 +0000 UTC m=+85356.184991726
bisecting fixing commit since bf3c87ba3144ea27305ceb6e9ef17fc63e5e572e
building syzkaller on 2130f682322a1c2ef698e3c27a2b97e89e96142f
ensuring issue is reproducible on original commit bf3c87ba3144ea27305ceb6e9ef17fc63e5e572e

testing commit bf3c87ba3144ea27305ceb6e9ef17fc63e5e572e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: b7310fc9bfe460bc419b81b56706fb77ad9e4f10c628f5c65bacd4dcaba3dfa2
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: 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
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: use-after-free 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: use-after-free 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 [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed
testing commit bf3c87ba3144ea27305ceb6e9ef17fc63e5e572e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 61eb22e88a89ff803f4447dedd99249e5c9aa1ed00679e01ebdd59a543bdab32
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 bug reproduces without the instrumentation
disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed
kconfig minimization: base=4925 full=6218 leaves diff=255
split chunks (needed=false): <255>
split chunk #0 of len 255 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 bf3c87ba3144ea27305ceb6e9ef17fc63e5e572e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: dd8288c6a87035b0b777483e6ca2261846cdf7fe51dae7e23f305c6c605e0f96
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: slab-out-of-bounds 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: 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 KASAN-READ]
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 bf3c87ba3144ea27305ceb6e9ef17fc63e5e572e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: a3382c5ec05b157e443fc758c65daa2a6b39284e4a6a58552d02d606069d5b03
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]
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 bf3c87ba3144ea27305ceb6e9ef17fc63e5e572e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 91b01e0e5ab3bd8a51037d4d0394dccd2522f862f8e406a862e72a1115579dc7
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 4/5
disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed
testing commit bf3c87ba3144ea27305ceb6e9ef17fc63e5e572e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 0d45b4e2b27bbd0a211538633da259f78ab5331202ef3804468d9610412c4158
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: 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
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 [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed
testing commit bf3c87ba3144ea27305ceb6e9ef17fc63e5e572e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
failed building bf3c87ba3144ea27305ceb6e9ef17fc63e5e572e: net/socket.c:1189:(.text+0x6dea): undefined reference to `wext_handle_ioctl'
net/socket.c:3390:(.text+0x73e4): undefined reference to `compat_wext_handle_ioctl'
net/core/net-procfs.c:343:(.text+0x33b): undefined reference to `wext_proc_exit'
net/core/net-procfs.c:327:(.text+0x4e2): undefined reference to `wext_proc_init'
minimized to 51 configs; suspects: [HID_ZEROPLUS 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 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 [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed
testing current HEAD 668c22005aabe968fe452d5370a5b1fc4dcc238d
testing commit 668c22005aabe968fe452d5370a5b1fc4dcc238d gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 11170ff6ccdda3f31762df52cafe9dff7c329b0f57d79695ea1d24f7bb61b314
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: slab-out-of-bounds 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]
crash still not fixed/happens on the oldest tested release
revisions tested: 7, total time: 1h32m0.81308187s (build: 26m22.64470877s, test: 47m6.761258943s)
crash still not fixed or there were kernel test errors
commit msg: Revert "remoteproc: Use unbounded workqueue for recovery work"
crash: KASAN: use-after-free Read in ext4_xattr_list_entries
EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,mblk_io_submit,mblk_io_submit,resgid=0x0000000000000000,oldalloc,mblk_io_submit,nogrpid,. Quota mode: none.
==================================================================
BUG: KASAN: use-after-free in ext4_xattr_list_entries+0x2d0/0x370 fs/ext4/xattr.c:670
Read of size 4 at addr ffff888115a7d018 by task syz.2.20/461

CPU: 0 PID: 461 Comm: syz.2.20 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x38/0x49 lib/dump_stack.c:106
 print_address_description.constprop.0+0x24/0x160 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report.cold+0x82/0xdb mm/kasan/report.c:444
 __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:448
 listxattr+0x5c/0xf0 fs/xattr.c:783
 path_listxattr+0xae/0x110 fs/xattr.c:807
 __do_sys_listxattr fs/xattr.c:819 [inline]
 __se_sys_listxattr fs/xattr.c:816 [inline]
 __x64_sys_listxattr+0x73/0xb0 fs/xattr.c:816
 x64_sys_call+0x481/0x990 arch/x86/include/generated/asm/syscalls_64.h:195
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f123348fe59
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:00007f12332f1028 EFLAGS: 00000246 ORIG_RAX: 00000000000000c2
RAX: ffffffffffffffda RBX: 00007f1233717fa0 RCX: 00007f123348fe59
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007f1233525e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1233718038 R14: 00007f1233717fa0 R15: 00007ffdf61b6ba8
 </TASK>

Allocated by task 99:
 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:433 [inline]
 ____kasan_kmalloc mm/kasan/common.c:512 [inline]
 ____kasan_kmalloc mm/kasan/common.c:471 [inline]
 __kasan_kmalloc+0xae/0xe0 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 kmem_cache_alloc_trace+0x30c/0x4e0 mm/slub.c:3274
 kmalloc include/linux/slab.h:619 [inline]
 kernfs_get_open_node fs/kernfs/file.c:552 [inline]
 kernfs_fop_open+0x7e5/0xbc0 fs/kernfs/file.c:698
 do_dentry_open+0x449/0x1020 fs/open.c:828
 vfs_open+0x9a/0xc0 fs/open.c:960
 do_open fs/namei.c:3616 [inline]
 path_openat+0x21a2/0x4180 fs/namei.c:3750
 do_filp_open+0x1ab/0x3f0 fs/namei.c:3777
 do_sys_openat2+0x135/0x8f0 fs/open.c:1236
 do_sys_open fs/open.c:1252 [inline]
 __do_sys_openat fs/open.c:1268 [inline]
 __se_sys_openat fs/open.c:1263 [inline]
 __x64_sys_openat+0x124/0x200 fs/open.c:1263
 x64_sys_call+0x2eb/0x990 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff888115a7d000
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 24 bytes inside of
 64-byte region [ffff888115a7d000, ffff888115a7d040)
The buggy address belongs to the page:
page:ffffea0004569f40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888115a7d400 pfn:0x115a7d
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004534800 0000000700000007 ffff888100042780
raw: ffff888115a7d400 0000000080200000 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 96, ts 4419951528, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook mm/page_alloc.c:2607 [inline]
 prep_new_page+0x1a2/0x310 mm/page_alloc.c:2613
 get_page_from_freelist+0x1ce2/0x30a0 mm/page_alloc.c:4487
 __alloc_pages+0x300/0x2d60 mm/page_alloc.c:5824
 __alloc_pages_node include/linux/gfp.h:595 [inline]
 alloc_pages_node include/linux/gfp.h:609 [inline]
 alloc_pages include/linux/gfp.h:622 [inline]
 alloc_slab_page mm/slub.c:1798 [inline]
 allocate_slab+0x39d/0x530 mm/slub.c:1937
 new_slab mm/slub.c:2000 [inline]
 ___slab_alloc.constprop.0+0x3ca/0x890 mm/slub.c:3033
 __slab_alloc.constprop.0+0x42/0x80 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc_trace+0x4a2/0x4e0 mm/slub.c:3272
 kmalloc include/linux/slab.h:619 [inline]
 kernfs_get_open_node fs/kernfs/file.c:552 [inline]
 kernfs_fop_open+0x7e5/0xbc0 fs/kernfs/file.c:698
 do_dentry_open+0x449/0x1020 fs/open.c:828
 vfs_open+0x9a/0xc0 fs/open.c:960
 do_open fs/namei.c:3616 [inline]
 path_openat+0x21a2/0x4180 fs/namei.c:3750
 do_filp_open+0x1ab/0x3f0 fs/namei.c:3777
 do_sys_openat2+0x135/0x8f0 fs/open.c:1236
 do_sys_open fs/open.c:1252 [inline]
 __do_sys_openat fs/open.c:1268 [inline]
 __se_sys_openat fs/open.c:1263 [inline]
 __x64_sys_openat+0x124/0x200 fs/open.c:1263
 x64_sys_call+0x2eb/0x990 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888115a7cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888115a7cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888115a7d000: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                            ^
 ffff888115a7d080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888115a7d100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================