ci2 starts bisection 2026-03-24 12:39:15.945930429 +0000 UTC m=+258.180911719 bisecting fixing commit since 58c592510fcd5577e655b9aca5c018b1af4ae229 building syzkaller on 4c131dc4b96f069f4177bf6cdd08431aaf9add88 ensuring issue is reproducible on original commit 58c592510fcd5577e655b9aca5c018b1af4ae229 testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: dca8bde996063a9361d1da1bee008d15c25a71ffaaa89cc686150f7eb622e2af all runs: crashed: general protection fault in ovl_lookup_single representative crash: general protection fault in ovl_lookup_single, 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 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 941e3f0b25d44afc3f4a9e8433cf9a1007c27474485b3b2c57b8b77ece6fe77c all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single representative crash: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single, types: [NULL-POINTER-DEREFERENCE] the bug reproduces without the instrumentation disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed kconfig minimization: base=4788 full=6025 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 [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: a0d8f09239c5e59a271971b8b26e302d9216d5af85b8f64faeddaaa7eef84eb5 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single representative crash: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: d4a3037a9e5cef5089efcbe2833416aaeae884a6c154ccd9a0e07b7ca85e3835 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single representative crash: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: c7ac1fd7428e45d5e5d0e36e7f5d8cf5d6704bdd01ca01fa4e28769e39cddc58 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single representative crash: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 958ccf9a3d085386d4a00d7d6600a75ef115a15e94da7fcaeab645c1c4d9011b all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single representative crash: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building 58c592510fcd5577e655b9aca5c018b1af4ae229: net/socket.c:1128:(.text+0x817): undefined reference to `wext_handle_ioctl' net/socket.c:3397:(.text+0xa08): undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:346:(.text+0x109): undefined reference to `wext_proc_exit' net/core/net-procfs.c:330:(.text+0x1e4): 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 [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing current HEAD 9136079e403ad15ed26ea110e148d3555a295f84 testing commit 9136079e403ad15ed26ea110e148d3555a295f84 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: bfbb860e46d019a15458d86716b5160588e9cfc07b0ba708ef8be84b435298d4 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single representative crash: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single, types: [NULL-POINTER-DEREFERENCE] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 2h38m32.926652091s (build: 29m8.046726689s, test: 43m17.911189051s) crash still not fixed or there were kernel test errors commit msg: Revert "rpmsg: core: fix race in driver_override_show() and use core helper" crash: BUG: unable to handle kernel NULL pointer dereference in ovl_lookup_single BUG: kernel NULL pointer dereference, address: 0000000000000016 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 10e71e067 P4D 10e71e067 PUD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 457 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:ovl_lookup_positive_unlocked fs/overlayfs/namei.c:203 [inline] RIP: 0010:ovl_lookup_single+0x42/0x2c0 fs/overlayfs/namei.c:226 Code: 48 89 f3 4c 89 d6 48 83 ec 08 4c 89 45 d0 44 8b 75 18 45 0f b6 39 e8 7d 2d ea ff 48 3d 00 f0 ff ff 49 89 c5 0f 87 b8 01 00 00 <8b> 00 a9 00 00 70 00 75 27 45 84 f6 74 0b 41 83 7d 5c 01 0f 84 bc RSP: 0018:ffffc900005a3c98 EFLAGS: 00010203 RAX: 0000000000000016 RBX: ffffc900005a3da0 RCX: 0000000000000000 RDX: 0000000000000004 RSI: 0000000400000000 RDI: ffff88810ed7a8a0 RBP: ffffc900005a3cc8 R08: 0000000000000005 R09: 0000000000000064 R10: ffff8881144557e0 R11: 0000000000003400 R12: ffffffff829f5f5d R13: 0000000000000016 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f39f77436c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000016 CR3: 000000011444e000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ovl_lookup_layer+0x132/0x140 fs/overlayfs/namei.c:310 ovl_lookup+0x51c/0xaa0 fs/overlayfs/namei.c:909 __lookup_hash+0x65/0xa0 fs/namei.c:1549 filename_create+0x8c/0x160 fs/namei.c:3616 user_path_create fs/namei.c:3673 [inline] do_mkdirat+0x55/0x120 fs/namei.c:3813 __do_sys_mkdirat fs/namei.c:3831 [inline] __se_sys_mkdirat fs/namei.c:3829 [inline] __x64_sys_mkdirat+0x15/0x20 fs/namei.c:3829 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f39f78deeb9 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:00007f39f7743028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f39f7b59fa0 RCX: 00007f39f78deeb9 RDX: 0000000000000000 RSI: 0000200000002000 RDI: ffffffffffffff9c RBP: 00007f39f794cc1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f39f7b5a038 R14: 00007f39f7b59fa0 R15: 00007fff9bd1d578 Modules linked in: CR2: 0000000000000016 ---[ end trace 6aa9cbaaee88707d ]--- RIP: 0010:ovl_lookup_positive_unlocked fs/overlayfs/namei.c:203 [inline] RIP: 0010:ovl_lookup_single+0x42/0x2c0 fs/overlayfs/namei.c:226 Code: 48 89 f3 4c 89 d6 48 83 ec 08 4c 89 45 d0 44 8b 75 18 45 0f b6 39 e8 7d 2d ea ff 48 3d 00 f0 ff ff 49 89 c5 0f 87 b8 01 00 00 <8b> 00 a9 00 00 70 00 75 27 45 84 f6 74 0b 41 83 7d 5c 01 0f 84 bc RSP: 0018:ffffc900005a3c98 EFLAGS: 00010203 RAX: 0000000000000016 RBX: ffffc900005a3da0 RCX: 0000000000000000 RDX: 0000000000000004 RSI: 0000000400000000 RDI: ffff88810ed7a8a0 RBP: ffffc900005a3cc8 R08: 0000000000000005 R09: 0000000000000064 R10: ffff8881144557e0 R11: 0000000000003400 R12: ffffffff829f5f5d R13: 0000000000000016 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f39f77436c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000016 CR3: 000000011444e000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 89 f3 mov %rsi,%rbx 3: 4c 89 d6 mov %r10,%rsi 6: 48 83 ec 08 sub $0x8,%rsp a: 4c 89 45 d0 mov %r8,-0x30(%rbp) e: 44 8b 75 18 mov 0x18(%rbp),%r14d 12: 45 0f b6 39 movzbl (%r9),%r15d 16: e8 7d 2d ea ff call 0xffea2d98 1b: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 21: 49 89 c5 mov %rax,%r13 24: 0f 87 b8 01 00 00 ja 0x1e2 * 2a: 8b 00 mov (%rax),%eax <-- trapping instruction 2c: a9 00 00 70 00 test $0x700000,%eax 31: 75 27 jne 0x5a 33: 45 84 f6 test %r14b,%r14b 36: 74 0b je 0x43 38: 41 83 7d 5c 01 cmpl $0x1,0x5c(%r13) 3d: 0f .byte 0xf 3e: 84 .byte 0x84 3f: bc .byte 0xbc