ci2 starts bisection 2026-04-03 06:07:09.406024413 +0000 UTC m=+29005.165084918
bisecting fixing commit since dad37bbb13a8cb34a50620b396e22db5eff2dfdd
building syzkaller on 4180d91913899c7394d15307c52f8ec0b228f6cc
ensuring issue is reproducible on original commit dad37bbb13a8cb34a50620b396e22db5eff2dfdd

testing commit dad37bbb13a8cb34a50620b396e22db5eff2dfdd gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: caba6f230d5e84793b56f522388aecab3c3c807614b70a02a49bdc423d95f060
run #0: crashed: kernel BUG in ext4_ext_map_blocks
run #1: crashed: kernel BUG in ext4_split_extent_at
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_mb_normalize_request
run #6: crashed: kernel BUG in ext4_split_extent_at
run #7: crashed: kernel BUG in ext4_mb_normalize_request
run #8: crashed: kernel BUG in ext4_mb_normalize_request
run #9: crashed: kernel BUG in ext4_mb_normalize_request
run #10: crashed: kernel BUG in ext4_mb_normalize_request
run #11: crashed: kernel BUG in ext4_split_extent_at
run #12: crashed: kernel BUG in ext4_mb_normalize_request
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_split_extent_at
run #16: crashed: kernel BUG in ext4_mb_normalize_request
run #17: crashed: kernel BUG in ext4_ext_map_blocks
run #18: crashed: kernel BUG in ext4_split_extent_at
run #19: crashed: kernel BUG in ext4_split_extent_at
representative crash: kernel BUG in ext4_ext_map_blocks, types: [BUG]
check whether we can drop unnecessary instrumentation
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing commit dad37bbb13a8cb34a50620b396e22db5eff2dfdd gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 0c7504a318dc18272179f45fdcdee85d0fd8ef98fcf4e217006ecceef42443a5
run #0: crashed: kernel BUG in ext4_split_extent_at
run #1: crashed: kernel BUG in ext4_ext_map_blocks
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_split_extent_at
run #6: crashed: kernel BUG in ext4_split_extent_at
run #7: crashed: kernel BUG in ext4_mb_normalize_request
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_split_extent_at, types: [BUG]
the bug reproduces without the instrumentation
disabling configs for [ubsan kasan locking atomic_sleep hang memleak], 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 dad37bbb13a8cb34a50620b396e22db5eff2dfdd gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: ba0a5b6f70192f712bf4bb7ac4e0c31e195d296be83d786fe57db4677afe49dd
run #0: crashed: kernel BUG in ext4_mb_normalize_request
run #1: crashed: kernel BUG in ext4_mb_normalize_request
run #2: crashed: kernel BUG in ext4_split_extent_at
run #3: crashed: kernel BUG in ext4_mb_normalize_request
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_mb_normalize_request
run #7: crashed: kernel BUG in ext4_split_extent_at
run #8: crashed: kernel BUG in __es_remove_extent
run #9: crashed: kernel BUG in ext4_split_extent_at
representative crash: kernel BUG in ext4_mb_normalize_request, 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 dad37bbb13a8cb34a50620b396e22db5eff2dfdd gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: a92388a9a761db860f14e41487f3376450cfecd045609cc9cec7237ffd56dc94
run #0: crashed: kernel BUG in ext4_split_extent_at
run #1: crashed: kernel BUG in ext4_mb_normalize_request
run #2: crashed: kernel BUG in ext4_es_cache_extent
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_mb_use_inode_pa
run #8: crashed: kernel BUG in ext4_split_extent_at
run #9: OK
representative crash: kernel BUG in ext4_split_extent_at, types: [BUG]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit dad37bbb13a8cb34a50620b396e22db5eff2dfdd gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 95a3a6f38954068bf5750ea187f2da65fb70b7cadc3558f0c7640a0cfcf68441
run #0: crashed: kernel BUG in ext4_split_extent_at
run #1: crashed: kernel BUG in ext4_mb_normalize_request
run #2: crashed: kernel BUG in ext4_split_extent_at
run #3: crashed: kernel BUG in ext4_mb_normalize_request
run #4: crashed: kernel BUG in ext4_split_extent_at
run #5: crashed: kernel BUG in ext4_mb_normalize_request
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_split_extent_at
run #9: OK
representative crash: kernel BUG in ext4_split_extent_at, types: [BUG]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [locking atomic_sleep hang memleak ubsan kasan], they are not needed
testing commit dad37bbb13a8cb34a50620b396e22db5eff2dfdd gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: a79d92b31e7dc5cc3392c1f8e4c129c87532a1726072717097363e9d02e5d537
run #0: crashed: kernel BUG in ext4_mb_normalize_request
run #1: crashed: kernel BUG in ext4_split_extent_at
run #2: crashed: kernel BUG in ext4_mb_normalize_request
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
representative crash: kernel BUG in ext4_mb_normalize_request, types: [BUG]
testing without sub-chunk 5/5
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit dad37bbb13a8cb34a50620b396e22db5eff2dfdd gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
failed building dad37bbb13a8cb34a50620b396e22db5eff2dfdd: 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 98 configs; suspects: [HID_ZEROPLUS SND SOUND USB_CONFIGFS USB_CONFIGFS_ECM_SUBSET USB_CONFIGFS_EEM USB_CONFIGFS_F_ACC USB_CONFIGFS_F_AUDIO_SRC USB_CONFIGFS_F_FS USB_CONFIGFS_F_HID USB_CONFIGFS_F_LB_SS USB_CONFIGFS_F_MIDI USB_CONFIGFS_F_PRINTER USB_CONFIGFS_F_UAC1 USB_CONFIGFS_F_UAC1_LEGACY USB_CONFIGFS_F_UAC2 USB_CONFIGFS_F_UVC USB_CONFIGFS_MASS_STORAGE USB_CONFIGFS_NCM USB_CONFIGFS_OBEX USB_CONFIGFS_RNDIS USB_CONFIGFS_SERIAL USB_CONFIGFS_UEVENT USB_EHCI_ROOT_HUB_TT USB_EHSET_TEST_FIXTURE USB_F_ACC USB_F_ACM USB_F_AUDIO_SRC USB_F_ECM USB_F_EEM USB_F_FS USB_F_HID USB_F_MASS_STORAGE USB_F_MIDI USB_F_NCM USB_F_OBEX USB_F_PRINTER USB_F_RNDIS USB_F_SERIAL USB_F_SS_LB USB_F_SUBSET USB_F_UAC1 USB_F_UAC1_LEGACY USB_F_UAC2 USB_F_UVC USB_GADGET_DEBUG_FILES USB_GADGET_DEBUG_FS USB_IPHETH USB_ISP1760 USB_ISP1760_HCD USB_ISP1760_HOST_ROLE USB_LIBCOMPOSITE USB_LINK_LAYER_TEST USB_MON 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 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 [ubsan kasan locking atomic_sleep hang memleak], 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: 130539c8decbd8081f99770ec1e65f5d85e49f44acf27c466d395dc1bff3d2fd
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_mb_normalize_request
run #3: crashed: kernel BUG in ext4_mb_normalize_request
run #4: crashed: kernel BUG in ext4_split_extent_at
run #5: crashed: kernel BUG in ext4_mb_normalize_request
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_split_extent_at
run #9: crashed: kernel BUG in ext4_mb_normalize_request
run #10: crashed: kernel BUG in ext4_split_extent_at
run #11: crashed: kernel BUG in ext4_split_extent_at
run #12: crashed: kernel BUG in ext4_mb_normalize_request
run #13: crashed: kernel BUG in ext4_split_extent_at
run #14: crashed: kernel BUG in ext4_mb_normalize_request
run #15: crashed: kernel BUG in ext4_mb_normalize_request
run #16: OK
run #17: crashed: kernel BUG in ext4_split_extent_at
run #18: OK
run #19: OK
representative crash: kernel BUG in ext4_split_extent_at, types: [BUG]
crash still not fixed/happens on the oldest tested release
reproducer is flaky (0.90 repro chance estimate)
revisions tested: 7, total time: 1h16m5.674747167s (build: 12m25.162326116s, test: 57m4.638547371s)
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_split_extent_at
EXT4-fs error (device loop2): ext4_mb_mark_diskspace_used:3357: comm syz.2.35: Allocating blocks 497-513 which overlap fs metadata
EXT4-fs (loop2): pa ffff88810d1b06e8: logic 128, phys. 385, len 8
EXT4-fs error (device loop2): ext4_mb_release_inode_pa:4374: group 0, free 0, pa_free 1
------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:3184!
invalid opcode: 0000 [#1] PREEMPT SMP
CPU: 0 PID: 572 Comm: syz.2.35 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_split_extent_at+0x3be/0x5a0 fs/ext4/extents.c:3184
Code: 0c 00 00 48 c7 c7 80 5e 7e 82 66 41 89 44 24 04 41 0f b7 43 08 4c 8d 04 40 49 c1 e0 04 4d 01 d8 e8 c7 ca ff ff e9 2e fd ff ff <0f> 0b f6 45 b0 04 41 0f b7 44 24 04 0f 85 82 00 00 00 8d 90 00 80
RSP: 0018:ffffc90000a03748 EFLAGS: 00010297
RAX: 0000000000000000 RBX: 0000000000000072 RCX: 0000000000000072
RDX: 0000000000000000 RSI: ffff88810d238198 RDI: 0000000000000001
RBP: ffffc90000a037d8 R08: ffff88811907b1b0 R09: 0000000000000000
R10: ffffc90000a03900 R11: ffff88811907b180 R12: ffff8881166e04a8
R13: ffff88810d238198 R14: ffffc90000a03ae0 R15: 0000000000000001
FS:  00007fa4e95576c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000340bf CR3: 000000010976c000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_split_extent+0xd4/0x1a0 fs/ext4/extents.c:3386
 ext4_split_convert_extents+0xa4/0xb0 fs/ext4/extents.c:3715
 ext4_ext_handle_unwritten_extents fs/ext4/extents.c:3876 [inline]
 ext4_ext_map_blocks+0xd40/0x1a30 fs/ext4/extents.c:4231
 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: 0033:0x7fa4e96f4799
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:00007fa4e9557028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fa4e996dfa0 RCX: 00007fa4e96f4799
RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000006
RBP: 00007fa4e978abd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa4e996e038 R14: 00007fa4e996dfa0 R15: 00007ffe56cae298
Modules linked in:
---[ end trace 402d94dfd000edb3 ]---
RIP: 0010:ext4_split_extent_at+0x3be/0x5a0 fs/ext4/extents.c:3184
Code: 0c 00 00 48 c7 c7 80 5e 7e 82 66 41 89 44 24 04 41 0f b7 43 08 4c 8d 04 40 49 c1 e0 04 4d 01 d8 e8 c7 ca ff ff e9 2e fd ff ff <0f> 0b f6 45 b0 04 41 0f b7 44 24 04 0f 85 82 00 00 00 8d 90 00 80
RSP: 0018:ffffc90000a03748 EFLAGS: 00010297
RAX: 0000000000000000 RBX: 0000000000000072 RCX: 0000000000000072
RDX: 0000000000000000 RSI: ffff88810d238198 RDI: 0000000000000001
RBP: ffffc90000a037d8 R08: ffff88811907b1b0 R09: 0000000000000000
R10: ffffc90000a03900 R11: ffff88811907b180 R12: ffff8881166e04a8
R13: ffff88810d238198 R14: ffffc90000a03ae0 R15: 0000000000000001
FS:  00007fa4e95576c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000340bf CR3: 000000010976c000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400