ci2 starts bisection 2023-10-27 05:13:54.778831872 +0000 UTC m=+20727.267155939 bisecting fixing commit since 28cc6246b5e756c8b9098ac213a761eac37692c4 building syzkaller on bfc478367b83b3fda580f54964aa9f3651beeb3d ensuring issue is reproducible on original commit 28cc6246b5e756c8b9098ac213a761eac37692c4 testing commit 28cc6246b5e756c8b9098ac213a761eac37692c4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 0fca87164ec82156cf74b9a3e3fa8b5c0eee00c7127e2f3f4cfc790dcb0a93e9 all runs: crashed: general protection fault in do_unlinkat representative crash: general protection fault in do_unlinkat, types: [UNKNOWN] check whether we can drop unnecessary instrumentation disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN LOCKDEP], they are not needed testing commit 28cc6246b5e756c8b9098ac213a761eac37692c4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: fe76235f14637d609784c7d40bdab4946a6a5caf0c1b29302d18c6e250842814 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat representative crash: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat, types: [UNKNOWN] the bug reproduces without the instrumentation disabling configs for [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP HANG], they are not needed kconfig minimization: base=4789 full=6023 leaves diff=237 split chunks (needed=false): <237> split chunk #0 of len 237 into 5 parts testing without sub-chunk 1/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit 28cc6246b5e756c8b9098ac213a761eac37692c4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 2bff5a5e986637b21b6d40c669e3b7f81651bd78780d091811ed8fa7aa026278 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat representative crash: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP HANG], they are not needed testing commit 28cc6246b5e756c8b9098ac213a761eac37692c4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a99e0151fe30d3fa233fb0e18fc6c867e4c0921bde1f8f7ccae2cd1d25921f33 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat representative crash: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit 28cc6246b5e756c8b9098ac213a761eac37692c4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 844206a682039ac61e6526ce9ad6f4865f9ae93b05dc4203ce776924da2b74aa all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat representative crash: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [HANG LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 28cc6246b5e756c8b9098ac213a761eac37692c4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4baebe365a92326d269ad18736e5a6af13587f388472adb0c046dc2c297527e9 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat representative crash: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [HANG LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 28cc6246b5e756c8b9098ac213a761eac37692c4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 failed building 28cc6246b5e756c8b9098ac213a761eac37692c4: net/socket.c:1109: undefined reference to `wext_handle_ioctl' net/socket.c:3378: undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:346: undefined reference to `wext_proc_exit' net/core/net-procfs.c:330: undefined reference to `wext_proc_init' minimized to 45 configs; suspects: [HID_ZEROPLUS 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 [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP HANG], they are not needed testing current HEAD 03a17e06abe5c849c5e24b34f9fcfdab61a810eb testing commit 03a17e06abe5c849c5e24b34f9fcfdab61a810eb gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8388f79f1ee48e66a3015717e520c895ccf10d9f9fedb1abf7f2e04c47c76585 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat representative crash: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat, types: [UNKNOWN] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 44m52.167116393s (build: 22m58.602178208s, test: 20m28.379609641s) crash still not fixed or there were kernel test errors commit msg: Revert "configfs: fix a race in configfs_lookup()" crash: BUG: unable to handle kernel NULL pointer dereference in do_unlinkat BUG: kernel NULL pointer dereference, address: 0000000000000002 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 10a8d7067 P4D 10a8d7067 PUD 1104fe067 PMD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 345 Comm: syz-executor.0 Not tainted 5.10.195-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 RIP: 0010:__d_entry_type include/linux/dcache.h:400 [inline] RIP: 0010:d_is_miss include/linux/dcache.h:405 [inline] RIP: 0010:d_is_negative include/linux/dcache.h:451 [inline] RIP: 0010:do_unlinkat+0x13f/0x2b0 fs/namei.c:4036 Code: 81 c7 a0 00 00 00 e8 60 af a1 00 48 8b 75 b8 48 8d 7d c0 44 89 ea e8 70 91 ff ff 48 3d 00 f0 ff ff 49 89 c7 0f 87 34 01 00 00 <8b> 00 8b 4d c4 48 8b 75 c8 89 c2 81 e2 00 00 70 00 80 3c 0e 00 0f RSP: 0018:ffffc900005dfeb0 EFLAGS: 00010203 RAX: 0000000000000002 RBX: 0000000000000000 RCX: 0000000400000000 RDX: 0000000000000003 RSI: 0000000300000000 RDI: ffff88810a98a500 RBP: ffffc900005dff18 R08: 0000000000000004 R09: 0000000000000064 R10: ffff888109711e80 R11: 0000000000000000 R12: ffff888107f8d000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002 FS: 00007f591d9d66c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000002 CR3: 0000000109637000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __do_sys_unlink fs/namei.c:4088 [inline] __se_sys_unlink fs/namei.c:4086 [inline] __x64_sys_unlink+0x3d/0x60 fs/namei.c:4086 do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f591de53b29 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:00007f591d9d60c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007f591df72f80 RCX: 00007f591de53b29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000100 RBP: 00007f591de9f47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f591df72f80 R15: 00007fffaee32d58 Modules linked in: CR2: 0000000000000002 ---[ end trace a6c3b7896984572a ]--- RIP: 0010:__d_entry_type include/linux/dcache.h:400 [inline] RIP: 0010:d_is_miss include/linux/dcache.h:405 [inline] RIP: 0010:d_is_negative include/linux/dcache.h:451 [inline] RIP: 0010:do_unlinkat+0x13f/0x2b0 fs/namei.c:4036 Code: 81 c7 a0 00 00 00 e8 60 af a1 00 48 8b 75 b8 48 8d 7d c0 44 89 ea e8 70 91 ff ff 48 3d 00 f0 ff ff 49 89 c7 0f 87 34 01 00 00 <8b> 00 8b 4d c4 48 8b 75 c8 89 c2 81 e2 00 00 70 00 80 3c 0e 00 0f RSP: 0018:ffffc900005dfeb0 EFLAGS: 00010203 RAX: 0000000000000002 RBX: 0000000000000000 RCX: 0000000400000000 RDX: 0000000000000003 RSI: 0000000300000000 RDI: ffff88810a98a500 RBP: ffffc900005dff18 R08: 0000000000000004 R09: 0000000000000064 R10: ffff888109711e80 R11: 0000000000000000 R12: ffff888107f8d000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002 FS: 00007f591d9d66c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000002 CR3: 0000000109637000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 81 c7 a0 00 00 00 add $0xa0,%edi 6: e8 60 af a1 00 call 0xa1af6b b: 48 8b 75 b8 mov -0x48(%rbp),%rsi f: 48 8d 7d c0 lea -0x40(%rbp),%rdi 13: 44 89 ea mov %r13d,%edx 16: e8 70 91 ff ff call 0xffff918b 1b: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 21: 49 89 c7 mov %rax,%r15 24: 0f 87 34 01 00 00 ja 0x15e * 2a: 8b 00 mov (%rax),%eax <-- trapping instruction 2c: 8b 4d c4 mov -0x3c(%rbp),%ecx 2f: 48 8b 75 c8 mov -0x38(%rbp),%rsi 33: 89 c2 mov %eax,%edx 35: 81 e2 00 00 70 00 and $0x700000,%edx 3b: 80 3c 0e 00 cmpb $0x0,(%rsi,%rcx,1) 3f: 0f .byte 0xf