ci2 starts bisection 2025-12-16 22:48:29.857479495 +0000 UTC m=+1761522.034602572 bisecting fixing commit since 993bed180178156a70afdafe8aaf23a117107352 building syzkaller on d615901c739a765329b688494cee2f8e1b5037cb ensuring issue is reproducible on original commit 993bed180178156a70afdafe8aaf23a117107352 testing commit 993bed180178156a70afdafe8aaf23a117107352 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: fe75ec52c918533e60fa0c63edca8201593724ef5a2bad00a83756f0b713df12 all runs: crashed: general protection fault in open_or_create_special_dir representative crash: general protection fault in open_or_create_special_dir, types: [DoS] check whether we can drop unnecessary instrumentation disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 993bed180178156a70afdafe8aaf23a117107352 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: d1fa6e9678a451a6bf419782dbb562208d9746f561c81aed8160a264793a5b8d all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir representative crash: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir, types: [NULL-POINTER-DEREFERENCE] the bug reproduces without the instrumentation disabling configs for [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed kconfig minimization: base=4921 full=6159 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 [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 993bed180178156a70afdafe8aaf23a117107352 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ecab772b899d79ef38c0baf9a2ac66f5db052eaad6141263e8dda8549c93e856 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir representative crash: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 993bed180178156a70afdafe8aaf23a117107352 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 78208d6131b669e19878dbf16d05936bc76a6ea0b3b441d7d80743d567fd5049 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir representative crash: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 993bed180178156a70afdafe8aaf23a117107352 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b0c063ca8147b8e07190f41848e3b8da76ea458cc055321da08051f8e261dbb0 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir representative crash: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 993bed180178156a70afdafe8aaf23a117107352 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 05e36f52c8dd2c30d8fc7a773b208b477fd7990a73059c840fb5f3a9513572ca all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir representative crash: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 993bed180178156a70afdafe8aaf23a117107352 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 failed building 993bed180178156a70afdafe8aaf23a117107352: 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 [memleak ubsan bug_or_warning 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: 45b1713909dffba8a968da819bd60e0b55e1ebaadeba5ce3fe108b8c4b3d1fc7 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir representative crash: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir, types: [NULL-POINTER-DEREFERENCE] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 1h4m4.054191685s (build: 27m25.567956813s, test: 34m50.667141471s) 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: BUG: unable to handle kernel NULL pointer dereference in open_or_create_special_dir BUG: kernel NULL pointer dereference, address: 0000000000000038 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 10fab2067 P4D 10fab2067 PUD 10faae067 PMD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 438 Comm: syz-executor.0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:open_or_create_special_dir+0x27/0xd0 fs/incfs/vfs.c:480 Code: 00 00 00 55 48 89 e5 41 56 41 55 41 54 53 48 89 d3 4c 8b 6f 30 e8 09 98 ff ff 48 85 c0 74 76 48 3d 00 f0 ff ff 49 89 c4 77 0a <48> 83 78 30 00 74 0f c6 03 00 5b 4c 89 e0 41 5c 41 5d 41 5e 5d c3 RSP: 0018:ffffc900005dfda8 EFLAGS: 00010203 RAX: 0000000000000008 RBX: ffffc900005dfddf RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffff88810ebd5c80 RDI: 00000000ffffffff RBP: ffffc900005dfdc8 R08: 0000000000000008 R09: 0000000000000064 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000008 R13: ffff88810c228c00 R14: ffff88811636d800 R15: ffff8881108173c0 FS: 00007f5074b3a6c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000038 CR3: 0000000110827000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: incfs_mount_fs+0x1ad/0x2f0 fs/incfs/vfs.c:1884 legacy_get_tree+0x26/0x50 fs/fs_context.c:611 vfs_get_tree+0x1a/0x70 fs/super.c:1530 do_new_mount fs/namespace.c:3034 [inline] path_mount+0x307/0xbf0 fs/namespace.c:3364 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount fs/namespace.c:3562 [inline] __x64_sys_mount+0x103/0x140 fs/namespace.c:3562 x64_sys_call+0x50d/0x990 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5074fd9da9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5074b3a0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f5075108050 RCX: 00007f5074fd9da9 RDX: 0000000020000180 RSI: 00000000200000c0 RDI: 0000000020000080 RBP: 00007f507502647a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f5075108050 R15: 00007ffcf0d36fc8 Modules linked in: CR2: 0000000000000038 ---[ end trace 5e257e35a07c540b ]--- RIP: 0010:open_or_create_special_dir+0x27/0xd0 fs/incfs/vfs.c:480 Code: 00 00 00 55 48 89 e5 41 56 41 55 41 54 53 48 89 d3 4c 8b 6f 30 e8 09 98 ff ff 48 85 c0 74 76 48 3d 00 f0 ff ff 49 89 c4 77 0a <48> 83 78 30 00 74 0f c6 03 00 5b 4c 89 e0 41 5c 41 5d 41 5e 5d c3 RSP: 0018:ffffc900005dfda8 EFLAGS: 00010203 RAX: 0000000000000008 RBX: ffffc900005dfddf RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffff88810ebd5c80 RDI: 00000000ffffffff RBP: ffffc900005dfdc8 R08: 0000000000000008 R09: 0000000000000064 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000008 R13: ffff88810c228c00 R14: ffff88811636d800 R15: ffff8881108173c0 FS: 00007f5074b3a6c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000038 CR3: 0000000110827000 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: 00 55 48 add %dl,0x48(%rbp) 5: 89 e5 mov %esp,%ebp 7: 41 56 push %r14 9: 41 55 push %r13 b: 41 54 push %r12 d: 53 push %rbx e: 48 89 d3 mov %rdx,%rbx 11: 4c 8b 6f 30 mov 0x30(%rdi),%r13 15: e8 09 98 ff ff call 0xffff9823 1a: 48 85 c0 test %rax,%rax 1d: 74 76 je 0x95 1f: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 25: 49 89 c4 mov %rax,%r12 28: 77 0a ja 0x34 * 2a: 48 83 78 30 00 cmpq $0x0,0x30(%rax) <-- trapping instruction 2f: 74 0f je 0x40 31: c6 03 00 movb $0x0,(%rbx) 34: 5b pop %rbx 35: 4c 89 e0 mov %r12,%rax 38: 41 5c pop %r12 3a: 41 5d pop %r13 3c: 41 5e pop %r14 3e: 5d pop %rbp 3f: c3 ret