ci2 starts bisection 2026-04-08 23:50:59.402573873 +0000 UTC m=+38581.267910559
bisecting fixing commit since 9136079e403ad15ed26ea110e148d3555a295f84
building syzkaller on 176bead5023749b301d573375d79dabee4d0d888
ensuring issue is reproducible on original commit 9136079e403ad15ed26ea110e148d3555a295f84

testing commit 9136079e403ad15ed26ea110e148d3555a295f84 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 9617616f3dc81afc9892a27aa103ac23694bea82281c05592513e3eb10e19f89
run #0: crashed: kernel BUG in ext4_es_cache_extent
run #1: crashed: kernel BUG in ext4_split_extent_at
run #2: crashed: kernel BUG in ext4_split_extent_at
run #3: crashed: kernel BUG in ext4_ext_insert_extent
run #4: crashed: kernel BUG in ext4_ext_insert_extent
run #5: crashed: kernel BUG in ext4_mb_normalize_request
run #6: crashed: kernel BUG in ext4_mb_normalize_request
run #7: crashed: kernel BUG in ext4_mb_normalize_request
run #8: crashed: kernel BUG in ext4_ext_insert_extent
run #9: crashed: kernel BUG in ext4_split_extent_at
run #10: crashed: kernel BUG in ext4_es_cache_extent
run #11: crashed: kernel BUG in ext4_ext_insert_extent
run #12: crashed: kernel BUG in ext4_split_extent_at
run #13: crashed: kernel BUG in ext4_mb_normalize_request
run #14: crashed: kernel BUG in ext4_split_extent_at
run #15: crashed: kernel BUG in ext4_es_cache_extent
run #16: crashed: kernel BUG in ext4_ext_insert_extent
run #17: crashed: kernel BUG in ext4_es_cache_extent
run #18: crashed: kernel BUG in ext4_ext_insert_extent
run #19: crashed: kernel BUG in ext4_ext_insert_extent
representative crash: kernel BUG in ext4_es_cache_extent, types: [BUG]
check whether we can drop unnecessary instrumentation
disabling configs for [memleak ubsan kasan locking atomic_sleep hang], they are not needed
testing commit 9136079e403ad15ed26ea110e148d3555a295f84 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: adff10e28fc675218f76f6601d70c4d421a01960ffeb5f05773f5195feab68ea
run #0: crashed: kernel BUG in ext4_split_extent_at
run #1: crashed: kernel BUG in ext4_split_extent_at
run #2: crashed: kernel BUG in ext4_ext_insert_extent
run #3: crashed: kernel BUG in ext4_ext_insert_extent
run #4: crashed: kernel BUG in ext4_ext_insert_extent
run #5: crashed: kernel BUG in ext4_ext_insert_extent
run #6: crashed: kernel BUG in ext4_split_extent_at
run #7: crashed: kernel BUG in ext4_ext_insert_extent
run #8: crashed: kernel BUG in ext4_ext_insert_extent
run #9: crashed: kernel BUG in ext4_split_extent_at
representative crash: kernel BUG in ext4_split_extent_at, types: [BUG]
the bug reproduces without the instrumentation
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
kconfig minimization: base=4788 full=6025 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 [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing commit 9136079e403ad15ed26ea110e148d3555a295f84 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: fd50e37a2af0b8ff52481098094eb0ccbb43a74226d4293e65bbc6441af562b5
run #0: crashed: kernel BUG in ext4_split_extent_at
run #1: crashed: kernel BUG in ext4_es_cache_extent
run #2: crashed: kernel BUG in ext4_es_cache_extent
run #3: crashed: kernel BUG in ext4_es_cache_extent
run #4: crashed: kernel BUG in ext4_es_cache_extent
run #5: crashed: kernel BUG in ext4_split_extent_at
run #6: crashed: kernel BUG in ext4_ext_insert_extent
run #7: crashed: kernel BUG in ext4_split_extent_at
run #8: crashed: kernel BUG in ext4_es_cache_extent
run #9: crashed: kernel BUG in ext4_ext_insert_extent
representative crash: kernel BUG in ext4_split_extent_at, types: [BUG]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed
testing commit 9136079e403ad15ed26ea110e148d3555a295f84 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 42dae82938b5a7905588e1983d1a8486a0fbb640077f5472aedac4babb392589
run #0: crashed: kernel BUG in ext4_ext_insert_extent
run #1: crashed: kernel BUG in ext4_split_extent_at
run #2: crashed: kernel BUG in ext4_split_extent_at
run #3: crashed: kernel BUG in ext4_split_extent_at
run #4: crashed: kernel BUG in ext4_ext_insert_extent
run #5: crashed: kernel BUG in ext4_split_extent_at
run #6: crashed: kernel BUG in ext4_mb_normalize_request
run #7: crashed: kernel BUG in ext4_mb_normalize_request
run #8: crashed: kernel BUG in ext4_ext_insert_extent
run #9: crashed: kernel BUG in ext4_split_extent_at
representative crash: kernel BUG in ext4_ext_insert_extent, types: [BUG]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing commit 9136079e403ad15ed26ea110e148d3555a295f84 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: c31dfbff85bdc3ea5a867240d65ec98a3b7d91fc0a89607f01ae6d0d0c5c1ba4
run #0: crashed: kernel BUG in ext4_ext_insert_extent
run #1: crashed: kernel BUG in ext4_mb_normalize_request
run #2: crashed: kernel BUG in ext4_mb_normalize_request
run #3: crashed: kernel BUG in ext4_split_extent_at
run #4: crashed: kernel BUG in ext4_split_extent_at
run #5: crashed: kernel BUG in ext4_es_cache_extent
run #6: crashed: kernel BUG in ext4_es_cache_extent
run #7: crashed: kernel BUG in ext4_split_extent_at
run #8: crashed: kernel BUG in ext4_split_extent_at
run #9: crashed: kernel BUG in ext4_split_extent_at
representative crash: kernel BUG in ext4_ext_insert_extent, types: [BUG]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit 9136079e403ad15ed26ea110e148d3555a295f84 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 0139b6d1581765eceb9195fcd92d175701a40d1197a07c842d4d4d56c3c89887
run #0: crashed: kernel BUG in ext4_split_extent_at
run #1: crashed: kernel BUG in ext4_split_extent_at
run #2: crashed: kernel BUG in ext4_split_extent_at
run #3: crashed: kernel BUG in ext4_split_extent_at
run #4: crashed: kernel BUG in ext4_mb_normalize_request
run #5: crashed: kernel BUG in ext4_split_extent_at
run #6: crashed: kernel BUG in ext4_split_extent_at
run #7: crashed: kernel BUG in ext4_split_extent_at
run #8: crashed: kernel BUG in ext4_mb_normalize_request
run #9: crashed: kernel BUG in ext4_split_extent_at
representative crash: kernel BUG in ext4_split_extent_at, types: [BUG]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed
testing commit 9136079e403ad15ed26ea110e148d3555a295f84 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
failed building 9136079e403ad15ed26ea110e148d3555a295f84: net/socket.c:1128:(.text+0x837): undefined reference to `wext_handle_ioctl'
net/socket.c:3397:(.text+0xa28): undefined reference to `compat_wext_handle_ioctl'
net/core/net-procfs.c:346:(.text+0x109): undefined reference to `wext_proc_exit'
net/core/net-procfs.c:330:(.text+0x1e4): 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 [hang memleak ubsan kasan locking atomic_sleep], 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: 004481a397851d30c21fa86261243accdc9509f0df833af3750f866e0732f6e9
run #0: crashed: kernel BUG in ext4_mb_normalize_request
run #1: crashed: kernel BUG in ext4_ext_insert_extent
run #2: crashed: kernel BUG in ext4_mb_normalize_request
run #3: crashed: kernel BUG in ext4_es_cache_extent
run #4: crashed: kernel BUG in ext4_ext_insert_extent
run #5: crashed: kernel BUG in ext4_es_cache_extent
run #6: crashed: kernel BUG in ext4_mb_normalize_request
run #7: crashed: kernel BUG in ext4_split_extent_at
run #8: crashed: kernel BUG in ext4_split_extent_at
run #9: crashed: kernel BUG in ext4_ext_insert_extent
representative crash: kernel BUG in ext4_mb_normalize_request, types: [BUG]
crash still not fixed/happens on the oldest tested release
revisions tested: 7, total time: 1h51m37.746307345s (build: 42m54.10148828s, test: 1h7m1.000699254s)
crash still not fixed or there were kernel test errors
commit msg: Merge android13-5.10 into android13-5.10-lts
crash: kernel BUG in ext4_mb_normalize_request
EXT4-fs error (device loop1): ext4_mb_mark_diskspace_used:3357: comm syz.1.76: Allocating blocks 497-513 which overlap fs metadata
EXT4-fs (loop1): pa ffff888109fe2888: logic 128, phys. 385, len 8
EXT4-fs error (device loop1): ext4_mb_release_inode_pa:4374: group 0, free 0, pa_free 1
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:3729!
invalid opcode: 0000 [#1] PREEMPT SMP
CPU: 0 PID: 844 Comm: syz.1.76 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_mb_normalize_request.constprop.0+0x496/0x540 fs/ext4/mballoc.c:3729
Code: 8b 45 a0 48 29 d6 8b 40 14 48 39 c6 0f 82 67 ff ff ff 48 8d 4b 24 48 8d 53 28 e8 d5 3c fd ff 66 81 4b 58 00 02 e9 4f ff ff ff <0f> 0b 0f 0b 0f 0b 31 ff 41 be 00 00 02 00 e9 e7 fb ff ff 0f 0b 31
RSP: 0018:ffffc90001387730 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888109fe1300 RCX: 0000000000020000
RDX: 0000000000000000 RSI: ffff8881148f9400 RDI: ffff888111620000
RBP: ffffc90001387790 R08: 0000000000000003 R09: 00000000000000d0
R10: 00000000000000e9 R11: ffff88810d6d11e8 R12: ffff88810d6d14d0
R13: 0000000000000017 R14: ffff88810d6d14d0 R15: ffff88810d6d14d0
FS:  00007f8f3c9606c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f05f7273000 CR3: 000000010d1ad000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_mb_new_blocks+0x77d/0x1010 fs/ext4/mballoc.c:5249
 ext4_ext_map_blocks+0x876/0x1a30 fs/ext4/extents.c:4341
 ext4_map_blocks+0x194/0x5a0 fs/ext4/inode.c:674
 mpage_map_one_extent fs/ext4/inode.c:2452 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2505 [inline]
 ext4_writepages+0x829/0x1180 fs/ext4/inode.c:2873
 do_writepages+0x30/0xb0 mm/page-writeback.c:2380
 __filemap_fdatawrite_range+0xc7/0x100 mm/filemap.c:427
 file_write_and_wait_range+0x4e/0x80 mm/filemap.c:766
 ext4_sync_file+0x76/0x380 fs/ext4/fsync.c:151
 vfs_fsync_range+0x41/0x80 fs/sync.c:202
 generic_write_sync include/linux/fs.h:2920 [inline]
 ext4_buffered_write_iter+0x10d/0x150 fs/ext4/file.c:278
 ext4_file_write_iter+0x5b/0x840 fs/ext4/file.c:685
 call_write_iter include/linux/fs.h:2066 [inline]
 new_sync_write+0x105/0x190 fs/read_write.c:518
 vfs_write+0x1fb/0x290 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+0x87/0xc0 fs/read_write.c:719
 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f8f3cafd799
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:00007f8f3c960028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f8f3cd76fa0 RCX: 00007f8f3cafd799
RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000006
RBP: 00007f8f3cb93bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8f3cd77038 R14: 00007f8f3cd76fa0 R15: 00007fff7d5f69b8
Modules linked in:
---[ end trace d91f6577df6713d1 ]---
RIP: 0010:ext4_mb_normalize_request.constprop.0+0x496/0x540 fs/ext4/mballoc.c:3729
Code: 8b 45 a0 48 29 d6 8b 40 14 48 39 c6 0f 82 67 ff ff ff 48 8d 4b 24 48 8d 53 28 e8 d5 3c fd ff 66 81 4b 58 00 02 e9 4f ff ff ff <0f> 0b 0f 0b 0f 0b 31 ff 41 be 00 00 02 00 e9 e7 fb ff ff 0f 0b 31
RSP: 0018:ffffc90001387730 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888109fe1300 RCX: 0000000000020000
RDX: 0000000000000000 RSI: ffff8881148f9400 RDI: ffff888111620000
RBP: ffffc90001387790 R08: 0000000000000003 R09: 00000000000000d0
R10: 00000000000000e9 R11: ffff88810d6d11e8 R12: ffff88810d6d14d0
R13: 0000000000000017 R14: ffff88810d6d14d0 R15: ffff88810d6d14d0
FS:  00007f8f3c9606c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4e0594b000 CR3: 000000010d1ad000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400