ci2 starts bisection 2026-01-25 04:05:47.146099399 +0000 UTC m=+65895.558374705 bisecting fixing commit since ab3e1c0dd1ff17ac9e51b12bb4c67a62be3b205e building syzkaller on 4e1406b4defac0e2a9d9424c70706f79a7750cf3 ensuring issue is reproducible on original commit ab3e1c0dd1ff17ac9e51b12bb4c67a62be3b205e testing commit ab3e1c0dd1ff17ac9e51b12bb4c67a62be3b205e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: a916fccce55efb6cdf41f5814a547d6167aa640f114f40f48af6e424e024a42e run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc run #1: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #2: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #3: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #4: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #5: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #6: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #7: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #8: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #9: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #10: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #11: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #12: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #13: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #14: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #15: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #16: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #17: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #18: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush run #19: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush representative crash: KASAN: null-ptr-deref Write in f2fs_issue_flush, types: [KASAN-NULL-POINTER-DEREFERENCE-WRITE] check whether we can drop unnecessary instrumentation disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit ab3e1c0dd1ff17ac9e51b12bb4c67a62be3b205e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: f5a7a0ed21eba3f8ec8836331b6b2f59b2e52aef7e8441a063a5e82beaf1c79b all runs: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush representative crash: KASAN: null-ptr-deref Write in f2fs_issue_flush, types: [KASAN-NULL-POINTER-DEREFERENCE-WRITE] the bug reproduces without the instrumentation disabling configs for [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed kconfig minimization: base=4788 full=6026 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 bug_or_warning locking atomic_sleep], they are not needed testing commit ab3e1c0dd1ff17ac9e51b12bb4c67a62be3b205e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 3e84c376e9b69c24b07d339756757c60a168297fa74c20aa8d3f74050f6f5b22 all runs: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush representative crash: KASAN: null-ptr-deref Write in f2fs_issue_flush, types: [KASAN-NULL-POINTER-DEREFERENCE-WRITE] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit ab3e1c0dd1ff17ac9e51b12bb4c67a62be3b205e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 95b40b4f8c3efdf2a3ae7f2e3729c71b20728026b9d75a26093133266f35c334 all runs: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush representative crash: KASAN: null-ptr-deref Write in f2fs_issue_flush, types: [KASAN-NULL-POINTER-DEREFERENCE-WRITE] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit ab3e1c0dd1ff17ac9e51b12bb4c67a62be3b205e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: f9255c9b2b90edda2799229f9d01b39baf48c6f9855ebf8120b84ae8f6677b6e all runs: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush representative crash: KASAN: null-ptr-deref Write in f2fs_issue_flush, types: [KASAN-NULL-POINTER-DEREFERENCE-WRITE] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit ab3e1c0dd1ff17ac9e51b12bb4c67a62be3b205e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: baa25a0bbc0397cafe65d28b9fb454b05f947aa44dd5b739f12e59208d81d9b6 all runs: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush representative crash: KASAN: null-ptr-deref Write in f2fs_issue_flush, types: [KASAN-NULL-POINTER-DEREFERENCE-WRITE] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit ab3e1c0dd1ff17ac9e51b12bb4c67a62be3b205e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building ab3e1c0dd1ff17ac9e51b12bb4c67a62be3b205e: net/socket.c:1128:(.text+0x1307): undefined reference to `wext_handle_ioctl' net/socket.c:3397:(.text+0x17c7): undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:346:(.text+0x33b): undefined reference to `wext_proc_exit' net/core/net-procfs.c:330:(.text+0x4e2): 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 [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing current HEAD 5601baec60aab411c7242b0138233963c7781dc3 testing commit 5601baec60aab411c7242b0138233963c7781dc3 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: c21dae5bcd3a4dd0258a49089243f003bc6449689fdf5470d78abfcfdbe29505 all runs: crashed: KASAN: null-ptr-deref Write in f2fs_issue_flush representative crash: KASAN: null-ptr-deref Write in f2fs_issue_flush, types: [KASAN-NULL-POINTER-DEREFERENCE-WRITE] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 37m57.858155529s (build: 15m44.77212729s, test: 20m51.156698909s) crash still not fixed or there were kernel test errors commit msg: Revert "usb: gadget: udc: fix use-after-free in usb_gadget_state_work" crash: KASAN: null-ptr-deref Write in f2fs_issue_flush F2FS-fs (loop2): Try to recover all the superblocks, ret: 0 ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: null-ptr-deref in atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] BUG: KASAN: null-ptr-deref in f2fs_issue_flush+0x19a/0x450 fs/f2fs/segment.c:678 Write of size 4 at addr 0000000000000024 by task syz.2.17/455 CPU: 1 PID: 455 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x81/0xac lib/dump_stack.c:118 __kasan_report mm/kasan/report.c:439 [inline] kasan_report.cold+0x64/0xdb mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x148/0x190 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] f2fs_issue_flush+0x19a/0x450 fs/f2fs/segment.c:678 f2fs_do_sync_file+0x1009/0x1ab0 fs/f2fs/file.c:385 f2fs_ioc_commit_atomic_write fs/f2fs/file.c:2232 [inline] __f2fs_ioctl+0x4cfe/0x9070 fs/f2fs/file.c:4375 f2fs_ioctl+0x162/0x4c0 fs/f2fs/file.c:4468 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x129/0x1a0 fs/ioctl.c:739 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fc99c826e79 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:00007fc99c68b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc99ca91fa0 RCX: 00007fc99c826e79 RDX: 0000000000000000 RSI: 000000000000f502 RDI: 0000000000000005 RBP: 00007fc99c8b9ee0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc99ca92038 R14: 00007fc99ca91fa0 R15: 00007ffc5a8e0d68 ================================================================== BUG: kernel NULL pointer dereference, address: 0000000000000024 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 110692067 P4D 110692067 PUD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 455 Comm: syz.2.17 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:arch_atomic_inc arch/x86/include/asm/atomic.h:95 [inline] RIP: 0010:atomic_inc include/asm-generic/atomic-instrumented.h:241 [inline] RIP: 0010:f2fs_issue_flush+0x19a/0x450 fs/f2fs/segment.c:678 Code: 00 00 8b b5 30 ff ff ff 4c 89 e7 e8 e0 df fe ff 49 8d 7e 24 be 04 00 00 00 41 89 c7 eb 2a 4d 8d 6e 24 4c 89 ef e8 d6 d3 97 ff 41 ff 46 24 8b b5 30 ff ff ff 4c 89 e7 e8 b3 df fe ff be 04 00 RSP: 0018:ffffc90000817968 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 1ffff92000102f30 RCX: ffffffff81326ef1 RDX: fffffbfff0ad873c RSI: 0000000000000004 RDI: ffffffff856c39e0 RBP: ffffc90000817a48 R08: 0000000000000001 R09: 0000000000000003 R10: fffffbfff0ad873c R11: 0000000000000001 R12: ffff8881126e4000 R13: 0000000000000024 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fc99c68b6c0(0000) GS:ffff8881f7500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000024 CR3: 00000001119b9000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_do_sync_file+0x1009/0x1ab0 fs/f2fs/file.c:385 f2fs_ioc_commit_atomic_write fs/f2fs/file.c:2232 [inline] __f2fs_ioctl+0x4cfe/0x9070 fs/f2fs/file.c:4375 f2fs_ioctl+0x162/0x4c0 fs/f2fs/file.c:4468 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x129/0x1a0 fs/ioctl.c:739 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fc99c826e79 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:00007fc99c68b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc99ca91fa0 RCX: 00007fc99c826e79 RDX: 0000000000000000 RSI: 000000000000f502 RDI: 0000000000000005 RBP: 00007fc99c8b9ee0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc99ca92038 R14: 00007fc99ca91fa0 R15: 00007ffc5a8e0d68 Modules linked in: CR2: 0000000000000024 ---[ end trace aef0ceb31a03b909 ]--- RIP: 0010:arch_atomic_inc arch/x86/include/asm/atomic.h:95 [inline] RIP: 0010:atomic_inc include/asm-generic/atomic-instrumented.h:241 [inline] RIP: 0010:f2fs_issue_flush+0x19a/0x450 fs/f2fs/segment.c:678 Code: 00 00 8b b5 30 ff ff ff 4c 89 e7 e8 e0 df fe ff 49 8d 7e 24 be 04 00 00 00 41 89 c7 eb 2a 4d 8d 6e 24 4c 89 ef e8 d6 d3 97 ff 41 ff 46 24 8b b5 30 ff ff ff 4c 89 e7 e8 b3 df fe ff be 04 00 RSP: 0018:ffffc90000817968 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 1ffff92000102f30 RCX: ffffffff81326ef1 RDX: fffffbfff0ad873c RSI: 0000000000000004 RDI: ffffffff856c39e0 RBP: ffffc90000817a48 R08: 0000000000000001 R09: 0000000000000003 R10: fffffbfff0ad873c R11: 0000000000000001 R12: ffff8881126e4000 R13: 0000000000000024 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fc99c68b6c0(0000) GS:ffff8881f7500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000024 CR3: 00000001119b9000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 8b b5 30 ff ff ff mov -0xd0(%rbp),%esi 8: 4c 89 e7 mov %r12,%rdi b: e8 e0 df fe ff call 0xfffedff0 10: 49 8d 7e 24 lea 0x24(%r14),%rdi 14: be 04 00 00 00 mov $0x4,%esi 19: 41 89 c7 mov %eax,%r15d 1c: eb 2a jmp 0x48 1e: 4d 8d 6e 24 lea 0x24(%r14),%r13 22: 4c 89 ef mov %r13,%rdi 25: e8 d6 d3 97 ff call 0xff97d400 * 2a: f0 41 ff 46 24 lock incl 0x24(%r14) <-- trapping instruction 2f: 8b b5 30 ff ff ff mov -0xd0(%rbp),%esi 35: 4c 89 e7 mov %r12,%rdi 38: e8 b3 df fe ff call 0xfffedff0 3d: be .byte 0xbe 3e: 04 00 add $0x0,%al