ci2 starts bisection 2025-05-20 10:49:09.967882931 +0000 UTC m=+62.399694283 bisecting fixing commit since 5d96939590c0122be2138255c921e57e3f78b7bd building syzkaller on fdb4c10ce6d49163d1f57463d7ca0ae22b71e765 ensuring issue is reproducible on original commit 5d96939590c0122be2138255c921e57e3f78b7bd testing commit 5d96939590c0122be2138255c921e57e3f78b7bd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 1969b41b08f2ffd19e6ca4f14b9ce0cfd69400929650d7d043a64c52406efd49 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_writepages run #3: crashed: kernel BUG in ext4_writepages run #4: crashed: kernel BUG in ext4_writepages 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_writepages run #8: crashed: kernel BUG in ext4_writepages run #9: crashed: kernel BUG in ext4_write_inline_data run #10: crashed: kernel BUG in ext4_write_inline_data run #11: crashed: kernel BUG in ext4_writepages run #12: crashed: kernel BUG in ext4_write_inline_data run #13: crashed: kernel BUG in ext4_writepages run #14: crashed: kernel BUG in ext4_writepages run #15: crashed: kernel BUG in ext4_writepages run #16: crashed: kernel BUG in ext4_writepages run #17: crashed: kernel BUG in ext4_writepages run #18: crashed: kernel BUG in ext4_writepages run #19: crashed: kernel BUG in ext4_writepages representative crash: kernel BUG in ext4_write_inline_data, types: [BUG] check whether we can drop unnecessary instrumentation disabling configs for [HANG LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 5d96939590c0122be2138255c921e57e3f78b7bd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 3d9b54d2e1b4cca40e3f1ebdd20225e8d492b60f85c36321e209e93cb156370f run #0: crashed: kernel BUG in ext4_write_inline_data run #1: crashed: kernel BUG in ext4_writepages run #2: crashed: kernel BUG in ext4_writepages run #3: crashed: kernel BUG in ext4_writepages run #4: crashed: kernel BUG in ext4_writepages run #5: crashed: kernel BUG in ext4_write_inline_data run #6: crashed: kernel BUG in ext4_writepages run #7: crashed: kernel BUG in ext4_writepages run #8: crashed: kernel BUG in ext4_write_inline_data run #9: crashed: kernel BUG in ext4_writepages representative crash: kernel BUG in ext4_write_inline_data, types: [BUG] the bug reproduces without the instrumentation disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN KASAN], they are not needed kconfig minimization: base=4921 full=6158 leaves diff=244 split chunks (needed=false): <244> split chunk #0 of len 244 into 5 parts testing without sub-chunk 1/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN KASAN LOCKDEP], they are not needed testing commit 5d96939590c0122be2138255c921e57e3f78b7bd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 22de392346d94fe2f6adc475cb424d6c52b6127eaa2a34ae9a96ef3a55c368c4 run #0: crashed: kernel BUG in ext4_write_inline_data run #1: crashed: kernel BUG in ext4_writepages run #2: crashed: kernel BUG in ext4_writepages run #3: crashed: kernel BUG in ext4_writepages run #4: crashed: kernel BUG in ext4_writepages run #5: crashed: kernel BUG in ext4_write_inline_data 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_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 [ATOMIC_SLEEP HANG LEAK UBSAN KASAN LOCKDEP], they are not needed testing commit 5d96939590c0122be2138255c921e57e3f78b7bd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 227661e18b43256344e48d3f084c41d842e9e989e51f2aa249779ff7f1eb8666 run #0: crashed: kernel BUG in ext4_writepages run #1: crashed: kernel BUG in ext4_write_inline_data run #2: crashed: kernel BUG in ext4_writepages run #3: crashed: kernel BUG in ext4_writepages run #4: crashed: kernel BUG in ext4_writepages run #5: crashed: kernel BUG in ext4_writepages 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 representative crash: kernel BUG in ext4_writepages, types: [BUG] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed testing commit 5d96939590c0122be2138255c921e57e3f78b7bd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 14e559628f4b15f871f85e70b8050ec3197ee216a394e07e64857b2e5bdf2f3a run #0: crashed: kernel BUG in ext4_writepages run #1: crashed: kernel BUG in ext4_writepages run #2: crashed: kernel BUG in ext4_writepages run #3: crashed: kernel BUG in ext4_writepages run #4: crashed: kernel BUG in ext4_writepages run #5: crashed: kernel BUG in ext4_writepages 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_write_inline_data representative crash: kernel BUG in ext4_writepages, types: [BUG] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN KASAN LOCKDEP], they are not needed testing commit 5d96939590c0122be2138255c921e57e3f78b7bd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 91d0d67db78c8951f38e3557f8bfa802a1cd599bd1e18cb71ee00b078063e238 run #0: crashed: kernel BUG in ext4_writepages run #1: crashed: kernel BUG in ext4_writepages run #2: crashed: kernel BUG in ext4_writepages run #3: crashed: kernel BUG in ext4_write_inline_data run #4: crashed: kernel BUG in ext4_writepages run #5: crashed: kernel BUG in ext4_writepages 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 representative crash: kernel BUG in ext4_writepages, types: [BUG] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN KASAN], they are not needed testing commit 5d96939590c0122be2138255c921e57e3f78b7bd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 failed building 5d96939590c0122be2138255c921e57e3f78b7bd: net/socket.c:1191: undefined reference to `wext_handle_ioctl' net/socket.c:3385: 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 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 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 X86_X32 ZEROPLUS_FF] disabling configs for [UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed testing current HEAD 57725b36873148314f53f045abafaea3aed5d3bd testing commit 57725b36873148314f53f045abafaea3aed5d3bd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: eb21c1df39b916df387bd84ce4160df49cc63bf82464514600e4574d0bf4aefe run #0: crashed: kernel BUG in ext4_writepages run #1: crashed: kernel BUG in ext4_writepages run #2: crashed: kernel BUG in ext4_writepages run #3: crashed: kernel BUG in ext4_writepages run #4: crashed: kernel BUG in ext4_write_inline_data run #5: crashed: kernel BUG in ext4_writepages 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 representative crash: kernel BUG in ext4_writepages, types: [BUG] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 4h4m28.029682154s (build: 38m10.884324078s, test: 39m17.613438933s) crash still not fixed or there were kernel test errors commit msg: Merge 5.15.182 into android13-5.15-lts crash: kernel BUG in ext4_writepages ------------[ cut here ]------------ kernel BUG at fs/ext4/inode.c:2746! invalid opcode: 0000 [#1] PREEMPT SMP CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.15.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: writeback wb_workfn (flush-7:0) RIP: 0010:ext4_writepages+0xee2/0x11a0 fs/ext4/inode.c:2746 Code: 8b 16 89 85 ac fe ff ff e9 e3 f5 ff ff 8b 85 78 fe ff ff 45 31 ff 4c 8b ad 90 fe ff ff 89 85 ac fe ff ff e9 59 fd ff ff 0f 0b <0f> 0b 89 85 ac fe ff ff e9 9a f4 ff ff 48 8d bd 50 ff ff ff e8 15 RSP: 0018:ffffc900000479b8 EFLAGS: 00010203 RAX: 000000c410000000 RBX: ffff88810b56d8e8 RCX: 0000000000000001 RDX: ffff888100215c80 RSI: 0000000000000ab5 RDI: 0000000000000000 RBP: ffffc90000047b78 R08: 0000000000000000 R09: ffffffff8144ce1f R10: ffffffffffffffff R11: fefefefefefefeff R12: ffff88810e438000 R13: ffff88810b56d758 R14: ffffc90000047cb0 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020005540 CR3: 0000000002e0b000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_writepages+0xc5/0x200 mm/page-writeback.c:2388 __writeback_single_inode+0x3f/0x310 fs/fs-writeback.c:1647 writeback_sb_inodes+0x21b/0x500 fs/fs-writeback.c:1930 wb_writeback+0x5e/0x2b0 fs/fs-writeback.c:2106 wb_do_writeback fs/fs-writeback.c:2253 [inline] wb_workfn+0xe6/0x510 fs/fs-writeback.c:2294 process_one_work+0x1aa/0x380 kernel/workqueue.c:2325 worker_thread+0x51/0x3c0 kernel/workqueue.c:2472 kthread+0x142/0x170 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Modules linked in: ---[ end trace 4f4c6df9c97fb6ad ]--- RIP: 0010:ext4_writepages+0xee2/0x11a0 fs/ext4/inode.c:2746 Code: 8b 16 89 85 ac fe ff ff e9 e3 f5 ff ff 8b 85 78 fe ff ff 45 31 ff 4c 8b ad 90 fe ff ff 89 85 ac fe ff ff e9 59 fd ff ff 0f 0b <0f> 0b 89 85 ac fe ff ff e9 9a f4 ff ff 48 8d bd 50 ff ff ff e8 15 RSP: 0018:ffffc900000479b8 EFLAGS: 00010203 RAX: 000000c410000000 RBX: ffff88810b56d8e8 RCX: 0000000000000001 RDX: ffff888100215c80 RSI: 0000000000000ab5 RDI: 0000000000000000 RBP: ffffc90000047b78 R08: 0000000000000000 R09: ffffffff8144ce1f R10: ffffffffffffffff R11: fefefefefefefeff R12: ffff88810e438000 R13: ffff88810b56d758 R14: ffffc90000047cb0 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe4b255c08 CR3: 0000000002e0b000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400