ci2 starts bisection 2026-04-04 21:13:34.364772521 +0000 UTC m=+169790.123833036 bisecting fixing commit since fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df building syzkaller on e28266709dd2a1d1452d4a5bbf271700e10335c6 ensuring issue is reproducible on original commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df testing commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 9720259587d508450c39d0b55f2602d8a0b7837a24974a3f2fdb585a5af10853 run #0: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #1: crashed: KASAN: use-after-free Read in ext4_ext_remove_space run #2: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #3: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #4: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #5: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #6: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #7: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #8: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #9: crashed: KASAN: use-after-free Read in ext4_ext_remove_space run #10: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #11: crashed: KASAN: use-after-free Read in ext4_ext_remove_space run #12: crashed: KASAN: use-after-free Read in ext4_find_extent run #13: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #14: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #15: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #16: crashed: KASAN: use-after-free Read in ext4_ext_remove_space run #17: crashed: KASAN: use-after-free Read in ext4_ext_remove_space run #18: crashed: lost connection to test machine run #19: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent representative crash: KASAN: use-after-free Read in ext4_ext_insert_extent, 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 fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: c0be6195c9abadf6007d572b26ca5c1ac0b130a5df0e98dc8dcbda80d59c58b0 run #0: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #1: crashed: KASAN: use-after-free Read in ext4_find_extent run #2: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #3: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #4: crashed: KASAN: use-after-free Read in ext4_ext_remove_space run #5: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #6: crashed: KASAN: use-after-free Read in ext4_find_extent run #7: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #8: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #9: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent representative crash: KASAN: use-after-free Read in ext4_ext_insert_extent, types: [KASAN-USE-AFTER-FREE-READ KASAN-USE-AFTER-FREE-WRITE] the bug reproduces without the instrumentation disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed kconfig minimization: base=4788 full=6023 leaves diff=246 split chunks (needed=false): <246> split chunk #0 of len 246 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 fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 02094109e3451a1ffac0e71a6b4f5f0ddebafbe23add72b5ebb33afd74d19a49 run #0: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #1: crashed: KASAN: use-after-free Read in ext4_find_extent run #2: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #3: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #4: crashed: KASAN: out-of-bounds Read in ext4_ext_remove_space run #5: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #6: crashed: KASAN: use-after-free Read in ext4_ext_remove_space run #7: crashed: KASAN: out-of-bounds Read in ext4_find_extent run #8: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #9: crashed: KASAN: use-after-free Read in ext4_ext_remove_space representative crash: KASAN: use-after-free Write in ext4_ext_remove_space, types: [KASAN-USE-AFTER-FREE-WRITE KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed testing commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: b35d8da80b0a4347d43656e7632f7e92415f34863028cc1196ec1c7531952b5b run #0: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #1: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #2: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #3: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #4: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #5: crashed: KASAN: use-after-free Read in ext4_ext_remove_space run #6: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #7: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #8: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #9: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent representative crash: KASAN: use-after-free Read in ext4_ext_insert_extent, types: [KASAN-USE-AFTER-FREE-READ KASAN-USE-AFTER-FREE-WRITE] 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 fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 1a3711cd44140443f2d00979feb9dd85938d4a6eaceac0290a7432ea45a91e47 run #0: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #1: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #2: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #3: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #4: crashed: KASAN: use-after-free Read in ext4_ext_remove_space run #5: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #6: crashed: KASAN: use-after-free Read in ext4_ext_remove_space run #7: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #8: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #9: crashed: KASAN: use-after-free Read in ext4_find_extent representative crash: KASAN: use-after-free Read in ext4_ext_insert_extent, types: [KASAN-USE-AFTER-FREE-READ KASAN-USE-AFTER-FREE-WRITE] 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 fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: e050b3ec99ed93cc3dd21f1558aa714e917d93fd0ed16a3ecc3e5f1dd0e30911 run #0: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #1: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #2: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #3: crashed: KASAN: use-after-free Read in ext4_find_extent run #4: crashed: KASAN: out-of-bounds Read in ext4_ext_insert_extent run #5: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #6: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #7: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #8: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #9: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent representative crash: KASAN: use-after-free Read in ext4_ext_insert_extent, types: [KASAN-USE-AFTER-FREE-READ KASAN-USE-AFTER-FREE-WRITE] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building fc9aa81462ee32fea3dd6d7c6d8d7dcdb69637df: 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 46 configs; suspects: [HID_ZEROPLUS 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 X86_X32 ZEROPLUS_FF] disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], 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: f5945efba8b4e03b33d8fafb2f6807d8097eec8159b1e348b70b3e0f07dfb8cb run #0: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #1: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #2: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #3: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #4: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #5: crashed: KASAN: use-after-free Read in ext4_ext_remove_space run #6: crashed: KASAN: use-after-free Read in ext4_find_extent run #7: crashed: KASAN: use-after-free Write in ext4_ext_remove_space run #8: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent run #9: crashed: KASAN: use-after-free Read in ext4_ext_insert_extent representative crash: KASAN: use-after-free Read in ext4_ext_insert_extent, types: [KASAN-USE-AFTER-FREE-READ KASAN-USE-AFTER-FREE-WRITE] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 2h16m48.576411173s (build: 1h12m35.402870928s, test: 1h1m57.808086229s) 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 ext4_ext_insert_extent ================================================================== BUG: KASAN: use-after-free in ext4_ext_insert_extent+0x1965/0x3e70 fs/ext4/extents.c:2153 Read of size 450036 at addr ffff88812b29cc3c by task syz.6.25/589 CPU: 0 PID: 589 Comm: syz.6.25 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 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x148/0x190 mm/kasan/generic.c:189 memmove+0x24/0x60 mm/kasan/shadow.c:54 ext4_ext_insert_extent+0x1965/0x3e70 fs/ext4/extents.c:2153 ext4_ext_map_blocks+0xfd6/0x52d0 fs/ext4/extents.c:4362 ext4_map_blocks+0x58d/0x1430 fs/ext4/inode.c:674 _ext4_get_block+0x206/0x5b0 fs/ext4/inode.c:817 ext4_get_block+0x11/0x20 fs/ext4/inode.c:834 ext4_block_write_begin+0x3b9/0xdc0 fs/ext4/inode.c:1101 ext4_write_begin+0x484/0xf00 fs/ext4/inode.c:1243 ext4_da_write_begin+0x52b/0xc30 fs/ext4/inode.c:3033 generic_perform_write+0x202/0x4a0 mm/filemap.c:3509 ext4_buffered_write_iter+0x1e5/0x420 fs/ext4/file.c:271 ext4_file_write_iter+0x358/0x18e0 fs/ext4/file.c:685 call_write_iter include/linux/fs.h:2066 [inline] new_sync_write+0x358/0x6d0 fs/read_write.c:518 vfs_write+0x4e4/0x750 fs/read_write.c:605 ksys_write+0x111/0x210 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:667 do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f2d0fd958f9 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:00007f2d0f7dc028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f2d0ffc4080 RCX: 00007f2d0fd958f9 RDX: 00000000002a979d RSI: 0000400000000000 RDI: 0000000000000004 RBP: 00007f2d0fe271bc R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2d0ffc4080 R15: 00007ffeb78f1178 The buggy address belongs to the page: page:ffffea0004aca700 refcount:2 mapcount:0 mapping:ffff88810e394b10 index:0x3f pfn:0x12b29c aops:def_blk_aops ino:0 flags: 0x4000000000002014(uptodate|lru|private) raw: 4000000000002014 ffffea000467b888 ffffea0004a80c88 ffff88810e394b10 raw: 000000000000003f ffff8881172ca1f8 00000002ffffffff ffff888118544000 page dumped because: kasan: bad access detected page->mem_cgroup:ffff888118544000 page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 589, ts 52581026874, free_ts 51295948690 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] __page_cache_alloc include/linux/pagemap.h:290 [inline] pagecache_get_page+0x169/0x6f0 mm/filemap.c:1848 find_or_create_page include/linux/pagemap.h:402 [inline] grow_dev_page fs/buffer.c:976 [inline] grow_buffers fs/buffer.c:1045 [inline] __getblk_slow+0x1ad/0x580 fs/buffer.c:1072 __getblk_gfp+0x3d/0x50 fs/buffer.c:1370 sb_getblk_gfp include/linux/buffer_head.h:368 [inline] ext4_ext_grow_indepth fs/ext4/extents.c:1327 [inline] ext4_ext_create_new_leaf fs/ext4/extents.c:1426 [inline] ext4_ext_insert_extent+0xe50/0x3e70 fs/ext4/extents.c:2098 ext4_ext_map_blocks+0xfd6/0x52d0 fs/ext4/extents.c:4362 ext4_map_blocks+0x58d/0x1430 fs/ext4/inode.c:674 _ext4_get_block+0x206/0x5b0 fs/ext4/inode.c:817 ext4_get_block+0x11/0x20 fs/ext4/inode.c:834 ext4_block_write_begin+0x3b9/0xdc0 fs/ext4/inode.c:1101 ext4_write_begin+0x484/0xf00 fs/ext4/inode.c:1243 ext4_da_write_begin+0x52b/0xc30 fs/ext4/inode.c:3033 generic_perform_write+0x202/0x4a0 mm/filemap.c:3509 ext4_buffered_write_iter+0x1e5/0x420 fs/ext4/file.c:271 ext4_file_write_iter+0x358/0x18e0 fs/ext4/file.c:685 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_list+0x18a/0xae0 mm/page_alloc.c:3443 release_pages+0x374/0xb00 mm/swap.c:1103 free_pages_and_swap_cache+0x180/0x1e0 mm/swap_state.c:356 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x129/0x790 mm/mmu_gather.c:326 exit_mmap+0x296/0x520 mm/mmap.c:3387 __mmput kernel/fork.c:1153 [inline] mmput kernel/fork.c:1176 [inline] mmput+0x99/0x430 kernel/fork.c:1170 exit_mm kernel/exit.c:539 [inline] do_exit+0x873/0x2330 kernel/exit.c:859 do_group_exit+0xe6/0x290 kernel/exit.c:986 get_signal+0x353/0x1a10 kernel/signal.c:2793 arch_do_signal_or_restart+0x2ad/0x2510 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x10f/0x160 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x27/0x160 kernel/entry/common.c:274 do_syscall_64+0x3f/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff88812b2b7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88812b2b7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88812b2b8000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88812b2b8080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88812b2b8100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop6): ext4_free_blocks:5700: comm syz.6.25: Freeing blocks not in datazone - block = 253226331490846, count = 15260 EXT4-fs error (device loop6): ext4_free_blocks:5700: comm syz.6.25: Freeing blocks not in datazone - block = 264241675879988, count = 5193 EXT4-fs error (device loop6): ext4_free_blocks:5700: comm syz.6.25: Freeing blocks not in datazone - block = 238221962560673, count = 8532 EXT4-fs error (device loop6): ext4_free_blocks:5700: comm syz.6.25: Freeing blocks not in datazone - block = 20277165544866, count = 5890 EXT4-fs error (device loop6): ext4_free_blocks:5700: comm syz.6.25: Freeing blocks not in datazone - block = 150240581669017, count = 9702 EXT4-fs error (device loop6): ext4_free_blocks:5700: comm syz.6.25: Freeing blocks not in datazone - block = 205974759593376, count = 16462 EXT4-fs error (device loop6): ext4_free_blocks:5700: comm syz.6.25: Freeing blocks not in datazone - block = 39607309140166, count = 14968 EXT4-fs error (device loop6): ext4_free_blocks:5700: comm syz.6.25: Freeing blocks not in datazone - block = 104785453204186, count = 11028 EXT4-fs error (device loop6): ext4_free_blocks:5700: comm syz.6.25: Freeing blocks not in datazone - block = 140442853531818, count = 6507 EXT4-fs error (device loop6): ext4_free_blocks:5700: comm syz.6.25: Freeing blocks not in datazone - block = 150833561824354, count = 284