ci2 starts bisection 2026-01-15 10:25:48.722791862 +0000 UTC m=+4308960.899914939 bisecting fixing commit since 4032a894ccb2cf50824f8f9be583e515ec22be87 building syzkaller on 3d2f584ddab119da50e8a8d26765aa98d3b33c02 ensuring issue is reproducible on original commit 4032a894ccb2cf50824f8f9be583e515ec22be87 testing commit 4032a894ccb2cf50824f8f9be583e515ec22be87 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: fcacc0b1c2f26a1aa52fc9275de6259080edc70b53edb9d6066027cae785b7c8 all runs: crashed: kernel BUG in ext4_write_inline_data representative crash: kernel BUG in ext4_write_inline_data, types: [BUG] check whether we can drop unnecessary instrumentation disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed testing commit 4032a894ccb2cf50824f8f9be583e515ec22be87 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 7623ffb217887123142b424907f328da77b22879f2887f6fb2619321f2369e09 all runs: crashed: kernel BUG in ext4_write_inline_data representative crash: kernel BUG in ext4_write_inline_data, 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=4921 full=6218 leaves diff=253 split chunks (needed=false): <253> split chunk #0 of len 253 into 5 parts testing without sub-chunk 1/5 disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed testing commit 4032a894ccb2cf50824f8f9be583e515ec22be87 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: cd6a122fcab3a9e3412631ab6ae21b8aa7dead1912d5dc00585019a28aac7fe2 all runs: crashed: kernel BUG in ext4_write_inline_data representative crash: kernel BUG in ext4_write_inline_data, types: [BUG] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed testing commit 4032a894ccb2cf50824f8f9be583e515ec22be87 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: de47ad499b336b3cb89eb0a93fbe3c1dd2db8b6dcf34e5bc068860f34c8116d1 run #0: crashed: kernel BUG in ext4_write_inline_data run #1: crashed: kernel BUG in ext4_write_inline_data run #2: crashed: kernel BUG in ext4_write_inline_data run #3: crashed: kernel BUG in ext4_write_inline_data run #4: crashed: kernel BUG in ext4_write_inline_data run #5: crashed: kernel BUG in ext4_write_inline_data run #6: crashed: kernel BUG in ext4_write_inline_data run #7: crashed: kernel BUG in ext4_write_inline_data run #8: crashed: kernel BUG in ext4_write_inline_data run #9: OK representative crash: kernel BUG in ext4_write_inline_data, 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 4032a894ccb2cf50824f8f9be583e515ec22be87 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9ba7f38fe67ef08b0a8bbc82d1b9054c803b9c1e84e9b4fe85f1766e25d7b34d run #0: crashed: kernel BUG in ext4_write_inline_data run #1: crashed: kernel BUG in ext4_write_inline_data run #2: crashed: kernel BUG in ext4_write_inline_data run #3: crashed: kernel BUG in ext4_write_inline_data run #4: crashed: kernel BUG in ext4_write_inline_data run #5: crashed: kernel BUG in ext4_write_inline_data run #6: crashed: kernel BUG in ext4_write_inline_data run #7: crashed: kernel BUG in ext4_write_inline_data run #8: crashed: kernel BUG in ext4_writepages run #9: OK representative crash: kernel BUG in ext4_write_inline_data, types: [BUG] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed testing commit 4032a894ccb2cf50824f8f9be583e515ec22be87 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 25cb64fdc105babd98a190804bd3b4d5d211dfc5b345dd2a6bcf104515e008fb run #0: crashed: kernel BUG in ext4_write_inline_data run #1: crashed: kernel BUG in ext4_write_inline_data run #2: crashed: kernel BUG in ext4_write_inline_data run #3: crashed: kernel BUG in ext4_write_inline_data run #4: crashed: kernel BUG in ext4_write_inline_data run #5: crashed: kernel BUG in ext4_write_inline_data run #6: crashed: kernel BUG in ext4_write_inline_data run #7: crashed: kernel BUG in ext4_write_inline_data run #8: crashed: kernel BUG in ext4_write_inline_data run #9: OK representative crash: kernel BUG in ext4_write_inline_data, types: [BUG] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed testing commit 4032a894ccb2cf50824f8f9be583e515ec22be87 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 failed building 4032a894ccb2cf50824f8f9be583e515ec22be87: net/socket.c:1191: undefined reference to `wext_handle_ioctl' net/socket.c:3390: undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:343: undefined reference to `wext_proc_exit' net/core/net-procfs.c:327: undefined reference to `wext_proc_init' minimized to 49 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 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 [memleak ubsan kasan locking atomic_sleep hang], they are not needed testing current HEAD 050dc55b0457aa6986b7618175ec7ccae95b842a testing commit 050dc55b0457aa6986b7618175ec7ccae95b842a gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8fdd63ac07e6dd9e27ef3e63a739e5aa1898bf1f082e26cb5afbbd551a241c2b all runs: crashed: kernel BUG in ext4_write_inline_data representative crash: kernel BUG in ext4_write_inline_data, types: [BUG] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 1h27m5.558041617s (build: 23m6.891727382s, test: 59m1.12684565s) crash still not fixed or there were kernel test errors commit msg: Revert "net/sched: act_connmark: handle errno on tcf_idr_check_alloc" crash: kernel BUG in ext4_write_inline_data loop2: detected capacity change from 0 to 1024 ------------[ cut here ]------------ kernel BUG at fs/ext4/inline.c:236! invalid opcode: 0000 [#1] PREEMPT SMP CPU: 0 PID: 960 Comm: syz.2.118 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:ext4_write_inline_data+0xfd/0x100 fs/ext4/inline.c:236 Code: 4c 01 f7 e8 25 a7 a0 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 45 8d 6c 08 c4 41 bf 3c 00 00 00 41 29 cf eb 84 0f 0b c3 <0f> 0b 90 41 89 f1 89 d6 45 85 c9 74 35 49 63 c9 48 01 f9 0f b7 57 RSP: 0018:ffffc90001173bc8 EFLAGS: 00010216 RAX: 0000000000001006 RBX: 0000000000001000 RCX: 0000000000001000 RDX: 000000000000003c RSI: ffff888116d62000 RDI: ffff88810b7b9c38 RBP: ffffc90001173bf8 R08: 0000000000000006 R09: ffffc90001173c28 R10: 0000000000000000 R11: ffff88810b7b9c38 R12: ffff88810b7b9c38 R13: 0000000000000006 R14: 0000000000000006 R15: 0000000000001000 FS: 00007f8e97d4f6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9c664cc000 CR3: 000000011317b000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_write_inline_data_end+0x114/0x490 fs/ext4/inline.c:799 ext4_da_write_end+0x1d6/0x2c0 fs/ext4/inode.c:3092 generic_perform_write+0xfc/0x250 mm/filemap.c:3881 ext4_buffered_write_iter+0x9f/0x160 fs/ext4/file.c:270 ext4_file_write_iter+0x5b/0x670 fs/ext4/file.c:664 call_write_iter include/linux/fs.h:2212 [inline] new_sync_write+0x105/0x190 fs/read_write.c:507 vfs_write+0x23c/0x2e0 fs/read_write.c:594 ksys_write+0x62/0xe0 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x15/0x20 fs/read_write.c:656 x64_sys_call+0x97b/0x990 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f8e982de969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8e97d4f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f8e98505fa0 RCX: 00007f8e982de969 RDX: 0000000000001006 RSI: 0000200000006c00 RDI: 0000000000000004 RBP: 00007f8e98360ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8e98505fa0 R15: 00007ffd764be7c8 Modules linked in: ---[ end trace a648fbb48ea2187f ]--- RIP: 0010:ext4_write_inline_data+0xfd/0x100 fs/ext4/inline.c:236 Code: 4c 01 f7 e8 25 a7 a0 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 45 8d 6c 08 c4 41 bf 3c 00 00 00 41 29 cf eb 84 0f 0b c3 <0f> 0b 90 41 89 f1 89 d6 45 85 c9 74 35 49 63 c9 48 01 f9 0f b7 57 RSP: 0018:ffffc90001173bc8 EFLAGS: 00010216 RAX: 0000000000001006 RBX: 0000000000001000 RCX: 0000000000001000 RDX: 000000000000003c RSI: ffff888116d62000 RDI: ffff88810b7b9c38 RBP: ffffc90001173bf8 R08: 0000000000000006 R09: ffffc90001173c28 R10: 0000000000000000 R11: ffff88810b7b9c38 R12: ffff88810b7b9c38 R13: 0000000000000006 R14: 0000000000000006 R15: 0000000000001000 FS: 00007f8e97d4f6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9c664cc000 CR3: 000000011317b000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400