ci2 starts bisection 2025-07-31 06:27:55.417532431 +0000 UTC m=+124246.740009005
bisecting fixing commit since db710ea87c32d5f806ffaaccbf98ecd3108314e4
building syzkaller on 3d2f584ddab119da50e8a8d26765aa98d3b33c02
ensuring issue is reproducible on original commit db710ea87c32d5f806ffaaccbf98ecd3108314e4
testing commit db710ea87c32d5f806ffaaccbf98ecd3108314e4 gcc
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
kernel signature: c5f9a6e510280bb413524a8d253b5b080e92237bb5a68439a0855550a6c7cc5a
run #0: crashed: KASAN: use-after-free Read in ext4_find_extent
run #1: crashed: kernel BUG in ext4_writepages
run #2: crashed: kernel BUG in ext4_writepages
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: kernel BUG in ext4_writepages
run #7: crashed: kernel BUG in ext4_writepages
run #8: crashed: kernel BUG in ext4_writepages
run #9: crashed: kernel BUG in ext4_writepages
run #10: crashed: kernel BUG in ext4_writepages
run #11: crashed: KASAN: use-after-free Read in ext4_find_extent
run #12: crashed: KASAN: use-after-free 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_find_extent
run #16: crashed: kernel BUG in ext4_writepages
run #17: crashed: kernel BUG in ext4_writepages
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 BUG]
check whether we can drop unnecessary instrumentation
disabling configs for [atomic_sleep hang memleak ubsan locking], they are not needed
testing commit db710ea87c32d5f806ffaaccbf98ecd3108314e4 gcc
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
kernel signature: cb38d8eb37964f56d4e2887d7b012880c886d26e60694505320629fee5ebf49c
run #0: crashed: KASAN: use-after-free Read in ext4_find_extent
run #1: crashed: kernel BUG in ext4_writepages
run #2: crashed: KASAN: use-after-free Read in ext4_find_extent
run #3: crashed: kernel BUG in ext4_writepages
run #4: crashed: KASAN: use-after-free Read in ext4_find_extent
run #5: crashed: kernel BUG in ext4_writepages
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_find_extent
representative crash: KASAN: use-after-free Read in ext4_find_extent, types: [KASAN-USE-AFTER-FREE-READ BUG]
the bug reproduces without the instrumentation
disabling configs for [locking atomic_sleep hang memleak ubsan], they are not needed
kconfig minimization: base=5186 full=6555 leaves diff=264
split chunks (needed=false): <264>
split chunk #0 of len 264 into 5 parts
testing without sub-chunk 1/5
disabling configs for [hang memleak ubsan locking atomic_sleep], they are not needed
testing commit db710ea87c32d5f806ffaaccbf98ecd3108314e4 gcc
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
kernel signature: 70c2cbab3169364cd83697ad0f565df72c8ec14bf2e524a214f2afe4b322a383
run #0: crashed: KASAN: use-after-free Read in ext4_find_extent
run #1: crashed: kernel BUG in ext4_writepages
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_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 2/5
disabling configs for [locking atomic_sleep hang memleak ubsan], they are not needed
testing commit db710ea87c32d5f806ffaaccbf98ecd3108314e4 gcc
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
kernel signature: ccb45100cd7aee3d9f77f47eeeabc5d3c636901993fbea0ace71dddfe0d05488
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: kernel BUG in ext4_writepages
run #4: crashed: KASAN: use-after-free Read in ext4_find_extent
run #5: crashed: kernel BUG in ext4_writepages
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: kernel BUG in ext4_writepages
representative crash: KASAN: use-after-free Read in ext4_find_extent, types: [KASAN-USE-AFTER-FREE-READ BUG]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [ubsan locking atomic_sleep hang memleak], they are not needed
testing commit db710ea87c32d5f806ffaaccbf98ecd3108314e4 gcc
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
kernel signature: 2c9ac10fe6660712c24b99eb2c71888e1e6735a583667a567de044fa8ca9f7cb
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: kernel BUG in ext4_writepages
run #5: crashed: KASAN: use-after-free Read in ext4_find_extent
run #6: crashed: kernel BUG in ext4_writepages
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_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 4/5
disabling configs for [locking atomic_sleep hang memleak ubsan], they are not needed
testing commit db710ea87c32d5f806ffaaccbf98ecd3108314e4 gcc
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
kernel signature: e56fe3f72e721b38e5d30422f9ccdf47d2af552cda07f8e328851ad25f8915c3
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 5/5
disabling configs for [locking atomic_sleep hang memleak ubsan], they are not needed
testing commit db710ea87c32d5f806ffaaccbf98ecd3108314e4 gcc
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
failed building db710ea87c32d5f806ffaaccbf98ecd3108314e4: ld.lld: error: undefined symbol: wext_proc_init
ld.lld: error: undefined symbol: wext_proc_exit
ld.lld: error: undefined symbol: wext_handle_ioctl
ld.lld: error: undefined symbol: compat_wext_handle_ioctl
minimized to 52 configs; suspects: [HID_ZEROPLUS 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_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 V4L2_ASYNC V4L2_FWNODE VIDEO_CAMERA_SENSOR WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_PURELIFI WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_SILABS WLAN_VENDOR_ZYDAS ZEROPLUS_FF]
disabling configs for [hang memleak ubsan locking atomic_sleep], they are not needed
testing current HEAD 42472e1a491371d2524e3de4c17c12a868649e3a
testing commit 42472e1a491371d2524e3de4c17c12a868649e3a gcc
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
kernel signature: 59c0e4063983be59903981ab0b60bdb83851e8c9d3791e094671d5a58469788b
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: kernel BUG in ext4_writepages
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: 1h21m33.152549196s (build: 42m48.646562835s, test: 33m45.89781724s)
crash still not fixed or there were kernel test errors
commit msg: ANDROID: GKI: Update symbol list for vivo
crash: KASAN: use-after-free Read in ext4_find_extent
==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:837 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0xbe6/0xda0 fs/ext4/extents.c:953
Read of size 4 at addr ffff888126630018 by task kworker/u4:2/41
CPU: 1 PID: 41 Comm: kworker/u4:2 Not tainted 6.1.145-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: writeback wb_workfn
(flush-7:2)
Call Trace:
__dump_stack+0x19/0x1c lib/dump_stack.c:88
dump_stack_lvl+0xa3/0xec lib/dump_stack.c:106
print_address_description+0x71/0x210 mm/kasan/report.c:316
print_report+0x4a/0x60 mm/kasan/report.c:427
kasan_report+0x122/0x150 mm/kasan/report.c:531
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350
ext4_ext_binsearch fs/ext4/extents.c:837 [inline]
ext4_find_extent+0xbe6/0xda0 fs/ext4/extents.c:953
ext4_ext_map_blocks+0x1cd/0x5240 fs/ext4/extents.c:4166
ext4_map_blocks+0x756/0x1680 fs/ext4/inode.c:679
mpage_map_one_extent fs/ext4/inode.c:2435 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2488 [inline]
ext4_writepages+0x10f7/0x24c0 fs/ext4/inode.c:2856
do_writepages+0x335/0x530 mm/page-writeback.c:2494
__writeback_single_inode+0x9d/0x790 fs/fs-writeback.c:1612
writeback_sb_inodes+0x76a/0x11a0 fs/fs-writeback.c:1903
wb_writeback+0x37c/0x7c0 fs/fs-writeback.c:2079
wb_do_writeback fs/fs-writeback.c:2226 [inline]
wb_workfn+0x347/0xb30 fs/fs-writeback.c:2266
process_one_work+0x70a/0xbd0 kernel/workqueue.c:2302
worker_thread+0x8c0/0xf60 kernel/workqueue.c:2449
kthread+0x245/0x2d0 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the physical page:
page:ffffea0004998c00 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x126630
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea0004998c48 ffffea0004998bc8 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 0x8140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO|__GFP_CMA), pid 379, tgid 379 (syz-executor), ts 51471916612, free_ts 51499459340
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook mm/page_alloc.c:2637 [inline]
prep_new_page+0x58c/0x650 mm/page_alloc.c:2644
get_page_from_freelist+0x2d52/0x2dc0 mm/page_alloc.c:4544
__alloc_pages+0x1c3/0x450 mm/page_alloc.c:5858
__folio_alloc+0x12/0x40 mm/page_alloc.c:5890
__folio_alloc_node include/linux/gfp.h:245 [inline]
folio_alloc include/linux/gfp.h:274 [inline]
alloc_page_vma include/linux/gfp.h:283 [inline]
do_anonymous_page mm/memory.c:4283 [inline]
handle_pte_fault mm/memory.c:5169 [inline]
__handle_mm_fault mm/memory.c:5313 [inline]
handle_mm_fault+0x11a7/0x1c50 mm/memory.c:5453
do_user_addr_fault+0x5f8/0xa10 arch/x86/mm/fault.c:1323
handle_page_fault arch/x86/mm/fault.c:1466 [inline]
exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1522
asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1545 [inline]
free_pcp_prepare mm/page_alloc.c:1619 [inline]
free_unref_page_prepare+0x645/0x650 mm/page_alloc.c:3581
free_unref_page_list+0x112/0x890 mm/page_alloc.c:3730
release_pages+0x913/0x960 mm/swap.c:1043
free_pages_and_swap_cache+0x66/0x80 mm/swap_state.c:315
tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
tlb_flush_mmu mm/mmu_gather.c:261 [inline]
tlb_finish_mmu+0x1af/0x380 mm/mmu_gather.c:361
unmap_region+0x290/0x2e0 mm/mmap.c:2410
do_mas_align_munmap+0x997/0xed0 mm/mmap.c:2676
do_mas_munmap+0x182/0x1f0 mm/mmap.c:2734
__vm_munmap+0x17f/0x290 mm/mmap.c:3033
__do_sys_munmap mm/mmap.c:3059 [inline]
__se_sys_munmap mm/mmap.c:3055 [inline]
__x64_sys_munmap+0x66/0x70 mm/mmap.c:3055
x64_sys_call+0x8a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:12
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff88812662ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88812662ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888126630000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff888126630080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff888126630100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2447!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 41 Comm: kworker/u4:2 Tainted: G B 6.1.145-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: writeback wb_workfn (flush-7:2)
RIP: 0010:mpage_map_one_extent fs/ext4/inode.c:2447 [inline]
RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2488 [inline]
RIP: 0010:ext4_writepages+0x2332/0x24c0 fs/ext4/inode.c:2856
Code: e8 53 5d d3 ff e9 d2 e4 ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 14 e5 ff ff 4c 89 f7 e8 35 5d d3 ff e9 07 e5 ff ff 0f 0b <0f> 0b 65 8b 05 95 95 39 7e 89 c3 c1 e8 06 48 8d 3c c5 28 95 af 85
RSP: 0018:ffffc900002af140 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 000000000000042b RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc900002af4b0 R08: dffffc0000000000 R09: ffffed102484a527
R10: ffffed102484a527 R11: 1ffff1102484a526 R12: 1ffff1102484a533
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888124252970
FS: 0000000000000000(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000f000 CR3: 000000010d40b000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
do_writepages+0x335/0x530 mm/page-writeback.c:2494
__writeback_single_inode+0x9d/0x790 fs/fs-writeback.c:1612
writeback_sb_inodes+0x76a/0x11a0 fs/fs-writeback.c:1903
wb_writeback+0x37c/0x7c0 fs/fs-writeback.c:2079
wb_do_writeback fs/fs-writeback.c:2226 [inline]
wb_workfn+0x347/0xb30 fs/fs-writeback.c:2266
process_one_work+0x70a/0xbd0 kernel/workqueue.c:2302
worker_thread+0x8c0/0xf60 kernel/workqueue.c:2449
kthread+0x245/0x2d0 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:mpage_map_one_extent fs/ext4/inode.c:2447 [inline]
RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2488 [inline]
RIP: 0010:ext4_writepages+0x2332/0x24c0 fs/ext4/inode.c:2856
Code: e8 53 5d d3 ff e9 d2 e4 ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 14 e5 ff ff 4c 89 f7 e8 35 5d d3 ff e9 07 e5 ff ff 0f 0b <0f> 0b 65 8b 05 95 95 39 7e 89 c3 c1 e8 06 48 8d 3c c5 28 95 af 85
RSP: 0018:ffffc900002af140 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 000000000000042b RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc900002af4b0 R08: dffffc0000000000 R09: ffffed102484a527
R10: ffffed102484a527 R11: 1ffff1102484a526 R12: 1ffff1102484a533
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888124252970
FS: 0000000000000000(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000f000 CR3: 000000010d40b000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400