ci2 starts bisection 2026-09-29 21:36:26.877366137 +0000 UTC m=+15782.192478006 bisecting fixing commit since c85054db46181ee85f10be997f41b347c85bd89b building syzkaller on fb92f11c4789d9647a75c09c983dbee5c8488ccf ensuring issue is reproducible on original commit c85054db46181ee85f10be997f41b347c85bd89b testing commit c85054db46181ee85f10be997f41b347c85bd89b gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 0f0b4bf7a2466d621ede61133836b1fed287bb7dafd386ed4130c8978f4e0d64 all runs: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super representative crash: UBSAN: shift-out-of-bounds in exfat_fill_super, types: [UBSAN] check whether we can drop unnecessary instrumentation disabling configs for [atomic_sleep hang memleak bug_or_warning kasan locking], they are not needed testing commit c85054db46181ee85f10be997f41b347c85bd89b gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 1e4a1fba2f40f74827a788439a05e4c3626e717e64a1343507b3219250776c3c all runs: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super representative crash: UBSAN: shift-out-of-bounds in exfat_fill_super, types: [UBSAN] the bug reproduces without the instrumentation disabling configs for [hang memleak bug_or_warning kasan locking atomic_sleep], they are not needed kconfig minimization: base=4921 full=6218 leaves diff=256 split chunks (needed=false): <256> split chunk #0 of len 256 into 5 parts testing without sub-chunk 1/5 disabling configs for [memleak bug_or_warning kasan locking atomic_sleep hang], they are not needed testing commit c85054db46181ee85f10be997f41b347c85bd89b gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: a13714765c3efb6e1f607032f368a8b43d63ceaeb1b7d4a82355727513b05567 all runs: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super representative crash: UBSAN: shift-out-of-bounds in exfat_fill_super, types: [UBSAN] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [kasan locking atomic_sleep hang memleak bug_or_warning], they are not needed testing commit c85054db46181ee85f10be997f41b347c85bd89b gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: ad416b05437aeb5d66d5c1bd1359bfacc02462992f912a0e5e6fd0dc961c2818 all runs: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super representative crash: UBSAN: shift-out-of-bounds in exfat_fill_super, types: [UBSAN] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [memleak bug_or_warning kasan locking atomic_sleep hang], they are not needed testing commit c85054db46181ee85f10be997f41b347c85bd89b gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: cc14eb97ae03b60d8d91e2c5e6a1ba1683b285bd0dd259ee73529608439d8a3b all runs: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super representative crash: UBSAN: shift-out-of-bounds in exfat_fill_super, types: [UBSAN] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed testing commit c85054db46181ee85f10be997f41b347c85bd89b gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 7866707a9fada7e3cacc14e95cf6b974d5b9aad978bb4383c356c78794ac20c5 all runs: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super representative crash: UBSAN: shift-out-of-bounds in exfat_fill_super, types: [UBSAN] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed testing commit c85054db46181ee85f10be997f41b347c85bd89b gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building c85054db46181ee85f10be997f41b347c85bd89b: net/socket.c:1188:(.text+0x21fb): undefined reference to `wext_handle_ioctl' net/socket.c:3389:(.text+0x244f): undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:343:(.text+0x109): undefined reference to `wext_proc_exit' net/core/net-procfs.c:327:(.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 [hang memleak bug_or_warning kasan locking atomic_sleep], they are not needed testing current HEAD 69b8586d68580d3e8c080cdfa07f4aa822ada3e7 testing commit 69b8586d68580d3e8c080cdfa07f4aa822ada3e7 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 5e2947a3573c50fdda695bedfef22776b48dcb4b8287eb169a47ba52ca4437f4 all runs: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super representative crash: UBSAN: shift-out-of-bounds in exfat_fill_super, types: [UBSAN] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 1h49m24.710985998s (build: 19m48.763885159s, test: 1h4m35.182290013s) crash still not fixed or there were kernel test errors commit msg: UPSTREAM: nvdimm/btt: reject an arena whose nfree is below the lane count crash: UBSAN: shift-out-of-bounds in exfat_fill_super loop2: detected capacity change from 0 to 256 exFAT-fs (loop2): Volume was not properly unmounted. Some data may be corrupt. Please run fsck. exFAT-fs (loop2): Medium has reported failures. Some data may be lost. ================================================================================ UBSAN: shift-out-of-bounds in fs/exfat/super.c:523:38 shift exponent 117 is too large for 32-bit type 'int' CPU: 1 PID: 472 Comm: syz.2.24 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x38/0x49 lib/dump_stack.c:106 dump_stack+0x10/0x12 lib/dump_stack.c:113 ubsan_epilogue+0x9/0x32 lib/ubsan.c:151 __ubsan_handle_shift_out_of_bounds.cold+0x6a/0x108 lib/ubsan.c:321 exfat_read_boot_sector fs/exfat/super.c:523 [inline] __exfat_fill_super fs/exfat/super.c:579 [inline] exfat_fill_super.cold+0x4ae/0x4f1 fs/exfat/super.c:647 get_tree_bdev+0x175/0x270 fs/super.c:1336 exfat_get_tree+0x10/0x20 fs/exfat/super.c:719 vfs_get_tree+0x1a/0x70 fs/super.c:1541 do_new_mount fs/namespace.c:3037 [inline] path_mount+0x307/0xcb0 fs/namespace.c:3367 do_mount fs/namespace.c:3380 [inline] __do_sys_mount fs/namespace.c:3588 [inline] __se_sys_mount fs/namespace.c:3565 [inline] __x64_sys_mount+0x103/0x140 fs/namespace.c:3565 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+0x33/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fd3159d20ca Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007fd315832e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fd315832ee0 RCX: 00007fd3159d20ca RDX: 00002000000005c0 RSI: 0000200000000240 RDI: 00007fd315832ea0 RBP: 00002000000005c0 R08: 00007fd315832ee0 R09: 0000000003010050 R10: 0000000003010050 R11: 0000000000000246 R12: 0000200000000240 R13: 00007fd315832ea0 R14: 00000000000014fe R15: 0000200000000600 ================================================================================ exFAT-fs (loop2): unable to set blocksize 2097152 exFAT-fs (loop2): failed to read boot sector exFAT-fs (loop2): failed to recognize exfat type