ci2 starts bisection 2026-05-05 07:22:11.513106596 +0000 UTC m=+42078.744891203 bisecting fixing commit since cc0ae2abdc73d5432c9a86d8576c344c68a1e29c building syzkaller on dcaebc52ee9a07f19b1af93180bb01c9c454c55c ensuring issue is reproducible on original commit cc0ae2abdc73d5432c9a86d8576c344c68a1e29c testing commit cc0ae2abdc73d5432c9a86d8576c344c68a1e29c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: b87026decd33aea8e293ea90a3231755f889f0caaf4196211e01aa61ec7169d0 run #0: crashed: KASAN: use-after-free Read in ext4_find_extent run #1: crashed: KASAN: use-after-free Read in ext4_find_extent run #2: crashed: KASAN: use-after-free Read in ext4_find_extent run #3: crashed: KASAN: use-after-free Read in ext4_find_extent run #4: crashed: KASAN: use-after-free Read in ext4_find_extent run #5: crashed: KASAN: use-after-free Read in ext4_find_extent run #6: crashed: KASAN: use-after-free Read in ext4_find_extent run #7: crashed: KASAN: use-after-free Read in ext4_find_extent run #8: crashed: KASAN: use-after-free Read in ext4_find_extent run #9: crashed: KASAN: use-after-free Read in ext4_ext_try_to_merge_right run #10: crashed: KASAN: use-after-free Read in ext4_find_extent run #11: crashed: KASAN: use-after-free Read in ext4_find_extent run #12: crashed: KASAN: slab-out-of-bounds Read in ext4_find_extent run #13: crashed: KASAN: use-after-free Read in ext4_find_extent run #14: crashed: KASAN: use-after-free Read in ext4_find_extent run #15: crashed: KASAN: use-after-free Read in ext4_ext_try_to_merge_right run #16: crashed: KASAN: slab-out-of-bounds Read in ext4_ext_try_to_merge_right run #17: crashed: KASAN: use-after-free Read in ext4_find_extent run #18: crashed: KASAN: use-after-free Read in ext4_find_extent run #19: crashed: KASAN: use-after-free Read in ext4_find_extent representative crash: KASAN: use-after-free Read in ext4_find_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 cc0ae2abdc73d5432c9a86d8576c344c68a1e29c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 80431c50b55f6b0944a02ae779e7aa2f80a13a999285c18252042bf82b86e158 run #0: crashed: KASAN: use-after-free Read in ext4_find_extent run #1: crashed: KASAN: use-after-free Read in ext4_find_extent run #2: crashed: KASAN: use-after-free Read in ext4_find_extent run #3: crashed: KASAN: slab-out-of-bounds Read in ext4_find_extent run #4: crashed: KASAN: use-after-free Read in ext4_find_extent run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_find_extent run #6: crashed: KASAN: use-after-free Read in ext4_find_extent run #7: crashed: KASAN: use-after-free Read in ext4_find_extent run #8: crashed: KASAN: use-after-free Read in ext4_ext_try_to_merge_right run #9: crashed: KASAN: use-after-free Read in ext4_ext_try_to_merge_right representative crash: KASAN: use-after-free Read in ext4_find_extent, 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 [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed testing commit cc0ae2abdc73d5432c9a86d8576c344c68a1e29c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 442c171a57a43dd209badc835dd7ed1d2f8a76a5b9ab47b92db2b5dc66249888 run #0: crashed: KASAN: use-after-free Read in ext4_find_extent run #1: crashed: KASAN: use-after-free Read in ext4_find_extent run #2: crashed: KASAN: use-after-free Read in ext4_find_extent run #3: crashed: KASAN: slab-out-of-bounds Read in ext4_find_extent run #4: crashed: KASAN: slab-out-of-bounds Read in ext4_find_extent run #5: crashed: KASAN: use-after-free Read in ext4_find_extent run #6: crashed: KASAN: use-after-free Read in ext4_find_extent run #7: crashed: KASAN: slab-out-of-bounds Read in ext4_find_extent run #8: crashed: KASAN: use-after-free Read in ext4_find_extent run #9: crashed: KASAN: use-after-free Read in ext4_find_extent representative crash: KASAN: use-after-free Read in ext4_find_extent, types: [KASAN-USE-AFTER-FREE-READ KASAN-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 cc0ae2abdc73d5432c9a86d8576c344c68a1e29c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: f295b80c4218402e865f4ad45be87285c5d620c29682b2b2f938e305e7434b42 all runs: crashed: KASAN: use-after-free Read in ext4_find_extent representative crash: KASAN: use-after-free Read in ext4_find_extent, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed testing commit cc0ae2abdc73d5432c9a86d8576c344c68a1e29c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 107285edb31565ce59c3022e5827cba10cba66f2d460b91483957530100bc647 run #0: crashed: KASAN: use-after-free Read in ext4_find_extent run #1: crashed: KASAN: slab-out-of-bounds Read in ext4_find_extent run #2: crashed: KASAN: use-after-free Read in ext4_find_extent run #3: crashed: KASAN: use-after-free Read in ext4_ext_try_to_merge_right run #4: crashed: KASAN: slab-out-of-bounds Read in ext4_find_extent run #5: crashed: KASAN: use-after-free Read in ext4_find_extent run #6: crashed: KASAN: use-after-free Read in ext4_find_extent run #7: crashed: KASAN: slab-out-of-bounds Read in ext4_find_extent run #8: crashed: KASAN: use-after-free Read in ext4_find_extent run #9: crashed: KASAN: use-after-free Read in ext4_find_extent representative crash: KASAN: use-after-free Read in ext4_find_extent, types: [KASAN-USE-AFTER-FREE-READ KASAN-READ] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit cc0ae2abdc73d5432c9a86d8576c344c68a1e29c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: a2727f0748d0d49a3bfa142720f73d92cd882b9d14c55316811e4a0f794afcad run #0: crashed: KASAN: use-after-free Read in ext4_find_extent run #1: crashed: KASAN: use-after-free Read in ext4_find_extent run #2: crashed: KASAN: use-after-free Read in ext4_find_extent run #3: crashed: KASAN: use-after-free Read in ext4_find_extent run #4: crashed: KASAN: use-after-free Read in ext4_find_extent run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_find_extent run #6: crashed: KASAN: use-after-free Read in ext4_find_extent run #7: crashed: KASAN: use-after-free Read in ext4_ext_try_to_merge_right run #8: crashed: KASAN: use-after-free Read in ext4_find_extent run #9: crashed: KASAN: use-after-free Read in ext4_find_extent representative crash: KASAN: use-after-free Read in ext4_find_extent, 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 cc0ae2abdc73d5432c9a86d8576c344c68a1e29c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building cc0ae2abdc73d5432c9a86d8576c344c68a1e29c: 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 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 7ae299a5827ae907825706c33e93f124c678e853 testing commit 7ae299a5827ae907825706c33e93f124c678e853 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 6e7febef3ba27e77f3d58aa488b8ffda9e42a5c2df550a19882e22528626221e run #0: crashed: KASAN: use-after-free Read in ext4_find_extent run #1: crashed: KASAN: use-after-free Read in ext4_find_extent run #2: crashed: KASAN: use-after-free Read in ext4_find_extent run #3: crashed: KASAN: use-after-free Read in ext4_ext_try_to_merge_right run #4: crashed: KASAN: slab-out-of-bounds Read in ext4_find_extent run #5: crashed: KASAN: use-after-free Read in ext4_find_extent run #6: crashed: KASAN: use-after-free Read in ext4_find_extent run #7: crashed: KASAN: use-after-free Read in ext4_find_extent run #8: crashed: KASAN: use-after-free Read in ext4_find_extent run #9: OK representative crash: KASAN: use-after-free Read in ext4_find_extent, types: [KASAN-USE-AFTER-FREE-READ] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 1h45m35.373173711s (build: 23m34.815292113s, test: 1h6m2.156840369s) crash still not fixed or there were kernel test errors commit msg: Revert "wifi: libertas: fix use-after-free in lbs_free_adapter()" crash: KASAN: use-after-free Read in ext4_find_extent ================================================================== BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:826 [inline] BUG: KASAN: use-after-free in ext4_find_extent+0xb93/0xc70 fs/ext4/extents.c:945 Read of size 4 at addr ffff88811fbe4018 by task syz.3.283/1840 CPU: 1 PID: 1840 Comm: syz.3.283 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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_ext_binsearch fs/ext4/extents.c:826 [inline] ext4_find_extent+0xb93/0xc70 fs/ext4/extents.c:945 ext4_ext_shift_extents+0xa2/0xee0 fs/ext4/extents.c:5198 ext4_collapse_range fs/ext4/extents.c:5446 [inline] ext4_fallocate+0x1b74/0x2c70 fs/ext4/extents.c:4779 vfs_fallocate+0x2b1/0xb10 fs/open.c:310 ksys_fallocate fs/open.c:333 [inline] __do_sys_fallocate fs/open.c:341 [inline] __se_sys_fallocate fs/open.c:339 [inline] __x64_sys_fallocate+0xb6/0x110 fs/open.c:339 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f21a7ef7819 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:00007f21a7d5a028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f21a8170fa0 RCX: 00007f21a7ef7819 RDX: 0000000000004000 RSI: 0000000000000008 RDI: 0000000000000007 RBP: 00007f21a7f8dc91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000008000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f21a8171038 R14: 00007f21a8170fa0 R15: 00007fff62a37d88 The buggy address belongs to the page: page:ffffea00047ef900 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x11fbe4 flags: 0x4000000000000000() raw: 4000000000000000 dead000000000100 dead000000000122 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 1820, ts 74386772510, free_ts 74419021440 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] shmem_alloc_page.part.0+0x121/0x180 mm/shmem.c:1580 shmem_alloc_page+0x8a/0x190 mm/shmem.c:1576 shmem_alloc_and_acct_page+0xf6/0x620 mm/shmem.c:1605 shmem_getpage_gfp+0x3a3/0x16e0 mm/shmem.c:1918 shmem_getpage mm/shmem.c:161 [inline] shmem_write_begin+0xd5/0x1a0 mm/shmem.c:2497 generic_perform_write+0x202/0x4a0 mm/filemap.c:3509 __generic_file_write_iter+0x309/0x540 mm/filemap.c:3638 generic_file_write_iter+0xc2/0x1d0 mm/filemap.c:3670 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_pwrite64 fs/read_write.c:712 [inline] __do_sys_pwrite64 fs/read_write.c:722 [inline] __se_sys_pwrite64 fs/read_write.c:719 [inline] __x64_sys_pwrite64+0x1b2/0x200 fs/read_write.c:719 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_list+0x18a/0xae0 mm/page_alloc.c:3443 release_pages+0x374/0xb00 mm/swap.c:1103 __pagevec_release+0x5e/0xe0 mm/swap.c:1123 pagevec_release include/linux/pagevec.h:88 [inline] shmem_undo_range+0x56a/0xe50 mm/shmem.c:965 shmem_truncate_range mm/shmem.c:1069 [inline] shmem_evict_inode+0x30d/0xa00 mm/shmem.c:1169 evict+0x372/0x940 fs/inode.c:612 iput_final fs/inode.c:1736 [inline] iput.part.0+0x33b/0x640 fs/inode.c:1762 iput+0x3f/0x50 fs/inode.c:1752 do_unlinkat+0x337/0x5d0 fs/namei.c:4050 __do_sys_unlink fs/namei.c:4090 [inline] __se_sys_unlink fs/namei.c:4088 [inline] __x64_sys_unlink+0xa5/0xe0 fs/namei.c:4088 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff88811fbe3f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811fbe3f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88811fbe4000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88811fbe4080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811fbe4100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================