ci2 starts bisection 2026-08-25 22:18:06.918621733 +0000 UTC m=+38019.796966790 bisecting fixing commit since b4be5dda13e9a1aeaa2db784c67cf19b00ccfc92 building syzkaller on 43bfcdb07c3552e4664e1029672054ac0924d543 ensuring issue is reproducible on original commit b4be5dda13e9a1aeaa2db784c67cf19b00ccfc92 testing commit b4be5dda13e9a1aeaa2db784c67cf19b00ccfc92 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 1ca2d4b961cd82eab62d44d545c4370290db6fb9ac92f15e782e85e2c30111a3 run #0: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #1: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #2: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #3: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #4: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #6: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #7: crashed: KASAN: use-after-free Read in ext4_search_dir run #8: crashed: KASAN: use-after-free Read in ext4_search_dir run #9: crashed: KASAN: use-after-free Read in ext4_search_dir run #10: crashed: KASAN: use-after-free Read in ext4_search_dir run #11: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #12: crashed: KASAN: use-after-free Read in ext4_search_dir run #13: crashed: KASAN: use-after-free Read in ext4_search_dir run #14: crashed: KASAN: use-after-free Read in ext4_search_dir run #15: crashed: KASAN: use-after-free Read in ext4_search_dir run #16: crashed: KASAN: use-after-free Read in ext4_search_dir run #17: crashed: KASAN: use-after-free Read in ext4_search_dir run #18: crashed: KASAN: use-after-free Read in ext4_search_dir run #19: crashed: KASAN: use-after-free Read in ext4_search_dir representative crash: KASAN: use-after-free Read in ext4_search_dir, types: [KASAN-USE-AFTER-FREE-READ KASAN-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 b4be5dda13e9a1aeaa2db784c67cf19b00ccfc92 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: dab488a6833d717b32aa0b2803f2a0d4440677f42b9065716a6f5138320232ea run #0: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #1: crashed: KASAN: use-after-free Read in ext4_search_dir run #2: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #3: crashed: KASAN: use-after-free Read in ext4_search_dir run #4: crashed: KASAN: use-after-free Read in ext4_search_dir run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #6: crashed: KASAN: use-after-free Read in ext4_search_dir run #7: crashed: KASAN: use-after-free Read in ext4_search_dir run #8: crashed: KASAN: use-after-free Read in ext4_search_dir run #9: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir representative crash: KASAN: use-after-free Read in ext4_search_dir, types: [KASAN-USE-AFTER-FREE-READ KASAN-READ] the bug reproduces without the instrumentation disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed kconfig minimization: base=4921 full=6218 leaves diff=256 split chunks (needed=false): <256> split chunk #0 of len 256 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 b4be5dda13e9a1aeaa2db784c67cf19b00ccfc92 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: edc271320ccb08e529a3055627c021e93ecabe250ea50dc899d0f3df9a9993fb run #0: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #1: crashed: KASAN: use-after-free Read in ext4_search_dir run #2: crashed: KASAN: use-after-free Read in ext4_search_dir run #3: crashed: KASAN: use-after-free Read in ext4_search_dir run #4: crashed: KASAN: use-after-free Read in ext4_search_dir run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #6: crashed: KASAN: use-after-free Read in ext4_search_dir run #7: crashed: KASAN: use-after-free Read in ext4_search_dir run #8: crashed: KASAN: use-after-free Read in ext4_search_dir run #9: crashed: KASAN: use-after-free Read in ext4_search_dir representative crash: KASAN: use-after-free Read in ext4_search_dir, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed testing commit b4be5dda13e9a1aeaa2db784c67cf19b00ccfc92 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 25fc9a006e43743aaf49701cdc03850c5efda446f037dfad97a1486d02ec607f run #0: crashed: KASAN: use-after-free Read in ext4_search_dir run #1: crashed: KASAN: use-after-free Read in ext4_search_dir run #2: crashed: KASAN: use-after-free Read in ext4_search_dir run #3: crashed: KASAN: use-after-free Read in ext4_search_dir run #4: crashed: KASAN: use-after-free Read in ext4_search_dir run #5: crashed: KASAN: use-after-free Read in ext4_search_dir run #6: crashed: KASAN: use-after-free Read in ext4_search_dir run #7: crashed: KASAN: out-of-bounds Read in ext4_search_dir run #8: crashed: KASAN: use-after-free Read in ext4_search_dir run #9: crashed: KASAN: use-after-free Read in ext4_search_dir representative crash: KASAN: use-after-free Read in ext4_search_dir, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit b4be5dda13e9a1aeaa2db784c67cf19b00ccfc92 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 24051fbfc030c9a2910ab42268a942d8b7d1e58cc471e6ae691f376eee79b708 run #0: crashed: KASAN: use-after-free Read in ext4_search_dir run #1: crashed: KASAN: use-after-free Read in ext4_search_dir run #2: crashed: KASAN: use-after-free Read in ext4_search_dir run #3: crashed: KASAN: use-after-free Read in ext4_search_dir run #4: crashed: KASAN: use-after-free Read in ext4_search_dir run #5: crashed: KASAN: use-after-free Read in ext4_search_dir run #6: crashed: KASAN: use-after-free Read in ext4_search_dir run #7: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #8: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #9: crashed: KASAN: use-after-free Read in ext4_search_dir representative crash: KASAN: use-after-free Read in ext4_search_dir, 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 b4be5dda13e9a1aeaa2db784c67cf19b00ccfc92 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: ab5ff50c0aa7ddb04e70a60822cc13ebf1fea08eff679be32e84c7a94c522a36 run #0: crashed: KASAN: use-after-free Read in ext4_search_dir run #1: crashed: KASAN: use-after-free Read in ext4_search_dir run #2: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #3: crashed: KASAN: use-after-free Read in ext4_search_dir run #4: crashed: KASAN: use-after-free Read in ext4_search_dir run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #6: crashed: KASAN: use-after-free Read in ext4_search_dir run #7: crashed: KASAN: use-after-free Read in ext4_search_dir run #8: crashed: KASAN: use-after-free Read in ext4_search_dir run #9: crashed: KASAN: use-after-free Read in ext4_search_dir representative crash: KASAN: use-after-free Read in ext4_search_dir, 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 b4be5dda13e9a1aeaa2db784c67cf19b00ccfc92 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building b4be5dda13e9a1aeaa2db784c67cf19b00ccfc92: net/socket.c:1188:(.text+0x6d1a): undefined reference to `wext_handle_ioctl' net/socket.c:3389:(.text+0x7314): 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 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 771777348d20ffba17482b8981f1f75a3b153e63 testing commit 771777348d20ffba17482b8981f1f75a3b153e63 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: f7622e184a8603271281b4e8f84917925bc0d75c74e11095bf0f08bef56cc335 run #0: crashed: KASAN: use-after-free Read in ext4_search_dir run #1: crashed: KASAN: use-after-free Read in ext4_search_dir run #2: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #3: crashed: KASAN: use-after-free Read in ext4_search_dir run #4: crashed: KASAN: use-after-free Read in ext4_search_dir run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #6: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #7: crashed: KASAN: use-after-free Read in ext4_search_dir run #8: crashed: KASAN: use-after-free Read in ext4_search_dir run #9: crashed: KASAN: use-after-free Read in ext4_search_dir representative crash: KASAN: use-after-free Read in ext4_search_dir, types: [KASAN-USE-AFTER-FREE-READ KASAN-READ] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 1h54m55.678409809s (build: 1h0m32.886083702s, test: 43m31.651689713s) crash still not fixed or there were kernel test errors commit msg: Merge a4365bc41baa ("i2c: core: fix adapter registration race") into android13-5.15-lts crash: KASAN: use-after-free Read in ext4_search_dir ================================================================== BUG: KASAN: use-after-free in ext4_search_dir+0x18d/0x1c0 fs/ext4/namei.c:1544 Read of size 1 at addr ffff88811ada5c86 by task syz.2.17/453 CPU: 0 PID: 453 Comm: syz.2.17 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: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_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 ext4_search_dir+0x18d/0x1c0 fs/ext4/namei.c:1544 ext4_find_inline_entry+0x3a7/0x560 fs/ext4/inline.c:1756 __ext4_find_entry+0x8c1/0xde0 fs/ext4/namei.c:1617 ext4_lookup_entry fs/ext4/namei.c:1774 [inline] ext4_lookup fs/ext4/namei.c:1842 [inline] ext4_lookup+0x153/0x6b0 fs/ext4/namei.c:1833 lookup_one_qstr_excl+0xe5/0x150 fs/namei.c:1571 filename_create+0x1a5/0x3e0 fs/namei.c:3844 do_mkdirat+0x9c/0x2c0 fs/namei.c:4088 __do_sys_mkdirat fs/namei.c:4113 [inline] __se_sys_mkdirat fs/namei.c:4111 [inline] __x64_sys_mkdirat+0xf4/0x140 fs/namei.c:4111 x64_sys_call+0x2e4/0x990 arch/x86/include/generated/asm/syscalls_64.h:259 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: 0033:0x7fba77962cc7 Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007fba777c5e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fba777c5ee0 RCX: 00007fba77962cc7 RDX: 00000000000001ff RSI: 0000200000000080 RDI: 00000000ffffff9c RBP: 0000200000000140 R08: 0000200000000080 R09: 0000000000000000 R10: 0000200000000140 R11: 0000000000000246 R12: 0000200000000080 R13: 00007fba777c5ea0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 242: 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_slab_alloc+0x94/0xc0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook mm/slab.h:550 [inline] slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0x179/0x4d0 mm/slub.c:3260 anon_vma_chain_alloc mm/rmap.c:141 [inline] __anon_vma_prepare+0x4e/0x4e0 mm/rmap.c:195 do_cow_fault mm/memory.c:4589 [inline] do_fault mm/memory.c:4711 [inline] handle_pte_fault+0x1db7/0x31c0 mm/memory.c:4923 __handle_mm_fault+0x4ea/0x1480 mm/memory.c:5219 do_handle_mm_fault+0x33b/0x690 mm/memory.c:5345 handle_mm_fault include/linux/mm.h:1847 [inline] do_user_addr_fault+0x2ea/0x1120 arch/x86/mm/fault.c:1416 handle_page_fault arch/x86/mm/fault.c:1507 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1560 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:606 Freed by task 242: 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:365 [inline] ____kasan_slab_free mm/kasan/common.c:327 [inline] __kasan_slab_free+0x111/0x150 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x94/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kmem_cache_free+0x105/0x2a0 mm/slub.c:3544 anon_vma_chain_free mm/rmap.c:146 [inline] unlink_anon_vmas+0x14b/0x6f0 mm/rmap.c:420 free_pgtables+0xa1/0x190 mm/memory.c:491 exit_mmap+0x216/0x840 mm/mmap.c:3247 __mmput+0x70/0x3a0 kernel/fork.c:1185 mmput kernel/fork.c:1208 [inline] mmput+0x35/0xf0 kernel/fork.c:1202 exit_mm kernel/exit.c:555 [inline] do_exit+0x90f/0x2540 kernel/exit.c:877 do_group_exit+0xe6/0x290 kernel/exit.c:1004 __do_sys_exit_group kernel/exit.c:1015 [inline] __se_sys_exit_group kernel/exit.c:1013 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1013 x64_sys_call+0x39a/0x990 arch/x86/include/generated/asm/syscalls_64.h:232 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 ffff88811ada5c60 which belongs to the cache anon_vma_chain of size 64 The buggy address is located 38 bytes inside of 64-byte region [ffff88811ada5c60, ffff88811ada5ca0) The buggy address belongs to the page: page:ffffea00046b6940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11ada5 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000122 ffff888100198300 raw: 0000000000000000 00000000002a002a 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 0x12800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY), pid 240, ts 17648856738, 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+0x48d/0x4d0 mm/slub.c:3260 anon_vma_chain_alloc mm/rmap.c:141 [inline] anon_vma_clone+0xc4/0x510 mm/rmap.c:287 __split_vma+0x12b/0x470 mm/mmap.c:2768 __do_munmap+0x23f/0x1000 mm/mmap.c:2882 __vm_munmap+0x117/0x240 mm/mmap.c:2978 __do_sys_munmap mm/mmap.c:3004 [inline] __se_sys_munmap mm/mmap.c:3000 [inline] __x64_sys_munmap+0x62/0x80 mm/mmap.c:3000 x64_sys_call+0x935/0x990 arch/x86/include/generated/asm/syscalls_64.h:12 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 page_owner free stack trace missing Memory state around the buggy address: ffff88811ada5b80: fc fc fc fc fa fb fb fb fb fb fb fb fc fc fc fc ffff88811ada5c00: fa fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb >ffff88811ada5c80: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff88811ada5d00: fc fc fc fc fa fb fb fb fb fb fb fb fc fc fc fc ffff88811ada5d80: fa fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb ================================================================== EXT4-fs error (device loop2): ext4_check_all_de:666: inode #12: block 7: comm syz.2.17: bad entry in directory: directory entry overrun - offset=0, inode=901261600, rec_len=7976, size=124 fake=0