ci2 starts bisection 2024-08-24 23:47:14.548648777 +0000 UTC m=+131163.438789076
bisecting fixing commit since 424f92bcbe8fa613ada7aec5ebe4ef434d5e50e4
building syzkaller on 34889ee3b09e7b4d381828377aa6173bfcc36cc7
ensuring issue is reproducible on original commit 424f92bcbe8fa613ada7aec5ebe4ef434d5e50e4

testing commit 424f92bcbe8fa613ada7aec5ebe4ef434d5e50e4 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: ebb53c47074e591ef2d3ed24a81496d7da129e80732ee9971cbaa0a816326fb2
run #0: crashed: KASAN: slab-out-of-bounds 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: 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
run #10: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode
run #11: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode
run #12: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode
run #13: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode
run #14: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode
run #15: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode
run #16: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode
run #17: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode
run #18: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode
run #19: crashed: KASAN: use-after-free Read in ext4_xattr_delete_inode
representative crash: KASAN: slab-out-of-bounds Read in ext4_xattr_delete_inode, types: [KASAN]
check whether we can drop unnecessary instrumentation
disabling configs for [UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed
testing commit 424f92bcbe8fa613ada7aec5ebe4ef434d5e50e4 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: c7b9957c00a4812eeec1e15e1965485aad67ffd8285e5fa224811d7cf2088b8e
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]
the bug reproduces without the instrumentation
disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed
kconfig minimization: base=4920 full=6160 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 [BUG LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed
testing commit 424f92bcbe8fa613ada7aec5ebe4ef434d5e50e4 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 2c14e3c5d8d2a184ded91552d288d6ae9e3ff9a6ee5bef67faaf56437b81424b
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]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [BUG LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed
testing commit 424f92bcbe8fa613ada7aec5ebe4ef434d5e50e4 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 8aaff0f7fa661181252dbffc301b162c0afce6425a7a785c20819117e593dfdc
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: 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: slab-out-of-bounds Read in ext4_xattr_delete_inode
run #9: crashed: KASAN: slab-out-of-bounds Read in ext4_xattr_delete_inode
representative crash: KASAN: use-after-free Read in ext4_xattr_delete_inode, types: [KASAN]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed
testing commit 424f92bcbe8fa613ada7aec5ebe4ef434d5e50e4 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 5a4b6d37d7dd76bff3cb1156ee91a0d857e26a4772b1cc4c1101f1f24474dd2c
run #0: crashed: KASAN: slab-out-of-bounds 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: 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: slab-out-of-bounds 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: slab-out-of-bounds Read in ext4_xattr_delete_inode, types: [KASAN]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [BUG LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed
testing commit 424f92bcbe8fa613ada7aec5ebe4ef434d5e50e4 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: cd08c75da856ca1ef9c0d9beac568b9b76d6d782986b7f409c9bc95676f6a4a5
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: 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: lost connection to test machine
representative crash: KASAN: use-after-free Read in ext4_xattr_delete_inode, types: [KASAN]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG LOCKDEP], they are not needed
testing commit 424f92bcbe8fa613ada7aec5ebe4ef434d5e50e4 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
failed building 424f92bcbe8fa613ada7aec5ebe4ef434d5e50e4: net/socket.c:1191: undefined reference to `wext_handle_ioctl'
net/socket.c:3385: undefined reference to `compat_wext_handle_ioctl'
net/core/net-procfs.c:343: undefined reference to `wext_proc_exit'
net/core/net-procfs.c:327: 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 [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed
testing current HEAD 29d153aabd54226781d6165592fbcfa1e00e571c
testing commit 29d153aabd54226781d6165592fbcfa1e00e571c gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 235a31d47643e65e9b7f4c74bd80cab794fd670c9fe6ef0db518267709410ae1
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]
crash still not fixed/happens on the oldest tested release
revisions tested: 7, total time: 1h7m4.663221423s (build: 14m50.769416197s, test: 20m24.787591955s)
crash still not fixed or there were kernel test errors
commit msg: Merge 5.15.156 into android13-5.15-lts
crash: KASAN: use-after-free Read in ext4_xattr_delete_inode
==================================================================
BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xe4e/0xe80 fs/ext4/xattr.c:2904
Read of size 4 at addr ffff88811f5da000 by task syz-executor.0/455

CPU: 0 PID: 455 Comm: syz-executor.0 Not tainted 5.15.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
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_delete_inode+0xe4e/0xe80 fs/ext4/xattr.c:2904
 ext4_evict_inode+0x8a0/0x1700 fs/ext4/inode.c:300
 evict+0x2ab/0x610 fs/inode.c:587
 iput_final fs/inode.c:1705 [inline]
 iput.part.0+0x334/0x640 fs/inode.c:1731
 iput+0x3f/0x50 fs/inode.c:1721
 d_delete_notify include/linux/fsnotify.h:270 [inline]
 vfs_rmdir.part.0+0x370/0x460 fs/namei.c:4162
 vfs_rmdir fs/namei.c:4135 [inline]
 do_rmdir+0x2e8/0x3f0 fs/namei.c:4210
 __do_sys_unlinkat fs/namei.c:4390 [inline]
 __se_sys_unlinkat fs/namei.c:4384 [inline]
 __x64_sys_unlinkat+0xad/0xe0 fs/namei.c:4384
 x64_sys_call+0x2c1/0x990 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x33/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4226a5d6c7
Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcdd41ece8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f4226a5d6c7
RDX: 0000000000000200 RSI: 00007ffcdd41fe90 RDI: 00000000ffffff9c
RBP: 00007f4226aa9336 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffcdd41fe90
R13: 00007f4226aa9336 R14: 000000000000ba80 R15: 0000000000000007
 </TASK>

The buggy address belongs to the page:
page:ffffea00047d7680 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x11f5da
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea00047d7748 ffff8881f743c680 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x100cca(GFP_HIGHUSER_MOVABLE), pid 465, ts 47888738807, free_ts 47897698949
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook mm/page_alloc.c:2605 [inline]
 prep_new_page+0x1a2/0x310 mm/page_alloc.c:2611
 get_page_from_freelist+0x1ce2/0x30a0 mm/page_alloc.c:4485
 __alloc_pages+0x2d5/0x2620 mm/page_alloc.c:5779
 __alloc_pages_node include/linux/gfp.h:591 [inline]
 alloc_pages_node include/linux/gfp.h:605 [inline]
 alloc_pages include/linux/gfp.h:618 [inline]
 wp_page_copy+0x168/0x16f0 mm/memory.c:3191
 do_wp_page+0x1fe/0x11f0 mm/memory.c:3531
 handle_pte_fault+0xa7c/0x23d0 mm/memory.c:4892
 __handle_mm_fault+0x4ea/0x1480 mm/memory.c:5167
 do_handle_mm_fault+0x33b/0x690 mm/memory.c:5293
 do_user_addr_fault+0x73d/0x1160 arch/x86/mm/fault.c:1356
 handle_page_fault arch/x86/mm/fault.c:1540 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1596
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:568
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 free_pcp_prepare+0x1b6/0x4c0 mm/page_alloc.c:1544
 free_unref_page_prepare mm/page_alloc.c:3534 [inline]
 free_unref_page_list+0x1e3/0xcd0 mm/page_alloc.c:3671
 release_pages+0x37f/0xff0 mm/swap.c:1009
 __pagevec_lru_add+0x7e5/0xb20 mm/swap.c:1102
 lru_add_drain_cpu+0x17b/0x390 mm/swap.c:642
 lru_add_drain+0x1f/0x50 mm/swap.c:747
 __pagevec_release+0x86/0xe0 mm/swap.c:1026
 pagevec_release include/linux/pagevec.h:81 [inline]
 shmem_undo_range+0x550/0xdc0 mm/shmem.c:965
 shmem_truncate_range mm/shmem.c:1064 [inline]
 shmem_evict_inode+0x30d/0xa00 mm/shmem.c:1146
 evict+0x2ab/0x610 fs/inode.c:587
 iput_final fs/inode.c:1705 [inline]
 iput.part.0+0x334/0x640 fs/inode.c:1731
 iput+0x3f/0x50 fs/inode.c:1721
 dentry_unlink_inode+0x284/0x400 fs/dcache.c:376
 __dentry_kill+0x326/0x610 fs/dcache.c:582
 dentry_kill fs/dcache.c:708 [inline]
 dput+0x308/0x8c0 fs/dcache.c:889
 do_renameat2+0x598/0xa50 fs/namei.c:4987

Memory state around the buggy address:
 ffff88811f5d9f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811f5d9f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88811f5da000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88811f5da080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88811f5da100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================