ci2 starts bisection 2025-07-21 10:24:49.103323832 +0000 UTC m=+112.321000146 bisecting fixing commit since ccc915784332a8717d3fef84283c416c0e57d3d6 building syzkaller on 40a34ec944732a2502ee67d92cc8c023355dfad4 ensuring issue is reproducible on original commit ccc915784332a8717d3fef84283c416c0e57d3d6 testing commit ccc915784332a8717d3fef84283c416c0e57d3d6 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 4a7aece0e741b50220cbff9d2ab1067b0e5c40da2dc8c25607e2ed834a94c414 all runs: crashed: kernel BUG in ext4_mb_release_inode_pa representative crash: kernel BUG in ext4_mb_release_inode_pa, 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 ccc915784332a8717d3fef84283c416c0e57d3d6 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 9f946458f1b69b46d211e5d49919af3eee4e8408e4b9d4d3d4a0c59c06a703e8 all runs: crashed: kernel BUG in ext4_mb_release_inode_pa representative crash: kernel BUG in ext4_mb_release_inode_pa, types: [BUG] the bug reproduces without the instrumentation disabling configs for [locking atomic_sleep hang memleak ubsan kasan], they are not needed kconfig minimization: base=5186 full=6548 leaves diff=266 split chunks (needed=false): <266> split chunk #0 of len 266 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 ccc915784332a8717d3fef84283c416c0e57d3d6 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 2cb817f2cbf9a54246b7bd999fd34155bd91495867f8153c6929140c599ead2f all runs: crashed: kernel BUG in ext4_mb_release_inode_pa representative crash: kernel BUG in ext4_mb_release_inode_pa, types: [BUG] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed testing commit ccc915784332a8717d3fef84283c416c0e57d3d6 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 51ca99c2940e836cb6ff03dbf09dace1da576a175f88e7e2caa49813f13aaa13 all runs: crashed: kernel BUG in ext4_mb_release_inode_pa representative crash: kernel BUG in ext4_mb_release_inode_pa, types: [BUG] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed testing commit ccc915784332a8717d3fef84283c416c0e57d3d6 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 0126bb32271070f7aefb4ec8d8e9059d4c4772b5a4c1fac5ccbf4a5bdc15c1be all runs: crashed: kernel BUG in ext4_mb_release_inode_pa representative crash: kernel BUG in ext4_mb_release_inode_pa, types: [BUG] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed testing commit ccc915784332a8717d3fef84283c416c0e57d3d6 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: a0d370eb710560ec03bab2107295849d9d65e05ae5dbbeb5a9fc32ebcfc83404 all runs: crashed: kernel BUG in ext4_mb_release_inode_pa representative crash: kernel BUG in ext4_mb_release_inode_pa, types: [BUG] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed testing commit ccc915784332a8717d3fef84283c416c0e57d3d6 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 failed building ccc915784332a8717d3fef84283c416c0e57d3d6: 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 50 configs; suspects: [HID_ZEROPLUS 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 X86_X32_ABI ZEROPLUS_FF] disabling configs for [locking atomic_sleep hang memleak ubsan kasan], they are not needed testing current HEAD 145c7fad733f13d7a8f4aa156785f40d38e966da testing commit 145c7fad733f13d7a8f4aa156785f40d38e966da gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: d00bfc57b5e4da2248db57120c7787fbb27eb7490418e1dfd9bf4797b752ce9d all runs: crashed: kernel BUG in ext4_mb_release_inode_pa representative crash: kernel BUG in ext4_mb_release_inode_pa, types: [BUG] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 4h39m52.268517531s (build: 2h7m27.790776311s, test: 36m33.400664267s) crash still not fixed or there were kernel test errors commit msg: ANDROID: gki_defconfig: Enable CONFIG_UDMABUF crash: kernel BUG in ext4_mb_release_inode_pa EXT4-fs error (device loop3): ext4_mb_release_inode_pa:4881: group 0, free 7, pa_free 16 ------------[ cut here ]------------ kernel BUG at fs/ext4/mballoc.c:4854! invalid opcode: 0000 [#1] PREEMPT SMP CPU: 1 PID: 516 Comm: syz.3.21 Not tainted 6.1.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:ext4_mb_release_inode_pa+0x2b4/0x2c0 fs/ext4/mballoc.c:4854 Code: b8 78 04 00 00 65 48 8b 04 25 28 00 00 00 48 3b 45 d0 75 0f 48 83 c4 38 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 6e 70 b8 00 0f 0b <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000ad3650 EFLAGS: 00010206 RAX: 00000000000000a0 RBX: ffff88810b83c000 RCX: 0000000001004343 RDX: 00000000000000a0 RSI: 00000000000000ff RDI: ffff888108ac4800 RBP: ffffc90000ad36b0 R08: ffffc90000ad367c R09: ffffc90000ad3678 R10: 0000000000000000 R11: ffffffff8110a460 R12: ffff88811b942068 R13: 00000000000000a0 R14: 0000000000000000 R15: ffffc90000ad36f0 FS: 00007f595bc686c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000021000 CR3: 00000001096c6000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_mb_discard_group_preallocations+0x377/0x450 fs/ext4/mballoc.c:5000 ext4_mb_discard_preallocations fs/ext4/mballoc.c:5569 [inline] ext4_mb_discard_preallocations_should_retry+0x8e/0x1b0 fs/ext4/mballoc.c:5590 ext4_mb_new_blocks+0xc3d/0xdc0 fs/ext4/mballoc.c:5793 ext4_alloc_branch fs/ext4/indirect.c:340 [inline] ext4_ind_map_blocks+0x788/0xc10 fs/ext4/indirect.c:635 ext4_map_blocks+0x2d5/0x660 fs/ext4/inode.c:681 _ext4_get_block+0x8d/0x140 fs/ext4/inode.c:822 ext4_get_block+0x12/0x20 fs/ext4/inode.c:839 ext4_block_write_begin+0x1a3/0x540 fs/ext4/inode.c:1124 ext4_write_begin+0x20a/0x640 fs/ext4/inode.c:-1 ext4_da_write_begin+0x228/0x2d0 fs/ext4/inode.c:3001 generic_perform_write+0x9e/0x270 mm/filemap.c:3882 ext4_buffered_write_iter+0xe0/0x180 fs/ext4/file.c:285 ext4_file_write_iter+0x2c3/0x650 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x346/0x430 fs/read_write.c:584 ksys_write+0x6e/0xe0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x16/0x20 fs/read_write.c:646 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 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 RIP: 0033:0x7f595ad8cde9 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:00007f595bc68038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f595afa5fa0 RCX: 00007f595ad8cde9 RDX: 0000000000043451 RSI: 0000400000000200 RDI: 0000000000000007 RBP: 00007f595ae0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f595afa5fa0 R15: 00007ffdecaff3d8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_mb_release_inode_pa+0x2b4/0x2c0 fs/ext4/mballoc.c:4854 Code: b8 78 04 00 00 65 48 8b 04 25 28 00 00 00 48 3b 45 d0 75 0f 48 83 c4 38 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 6e 70 b8 00 0f 0b <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000ad3650 EFLAGS: 00010206 RAX: 00000000000000a0 RBX: ffff88810b83c000 RCX: 0000000001004343 RDX: 00000000000000a0 RSI: 00000000000000ff RDI: ffff888108ac4800 RBP: ffffc90000ad36b0 R08: ffffc90000ad367c R09: ffffc90000ad3678 R10: 0000000000000000 R11: ffffffff8110a460 R12: ffff88811b942068 R13: 00000000000000a0 R14: 0000000000000000 R15: ffffc90000ad36f0 FS: 00007f595bc686c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000021000 CR3: 00000001096c6000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400