ci2 starts bisection 2025-06-03 04:35:45.623666235 +0000 UTC m=+16115.391895814
bisecting fixing commit since efda22f3484c75674a2c4f22e4540e8289ead901
building syzkaller on a95239b10464c498ac06b56698a6996643680b86
ensuring issue is reproducible on original commit efda22f3484c75674a2c4f22e4540e8289ead901

testing commit efda22f3484c75674a2c4f22e4540e8289ead901 gcc
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
kernel signature: ff67331e1bc24e2b3c965023a1650b1f6797784238e57421be399ba8f7aedb6e
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 [BUG KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed
testing commit efda22f3484c75674a2c4f22e4540e8289ead901 gcc
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
kernel signature: 366e9191a4e071206aa0a5a8c0b97702effc884c6a2390f7b340ffaf92bf5ffa
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 [LOCKDEP ATOMIC_SLEEP HANG LEAK BUG KASAN], they are not needed
kconfig minimization: base=5186 full=6549 leaves diff=266
split chunks (needed=false): <266>
split chunk #0 of len 266 into 5 parts
testing without sub-chunk 1/5
disabling configs for [ATOMIC_SLEEP HANG LEAK BUG KASAN LOCKDEP], they are not needed
testing commit efda22f3484c75674a2c4f22e4540e8289ead901 gcc
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
kernel signature: 06840108e6d63174371882bf4b3a1e27a579e6d7d2c197efb60e4a20ce6dd486
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 [BUG KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed
testing commit efda22f3484c75674a2c4f22e4540e8289ead901 gcc
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
kernel signature: 07e13a6d2487c8cd8c4f4572dd2d327f33d5cf30af80f18d6c46e482da1902bc
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 [ATOMIC_SLEEP HANG LEAK BUG KASAN LOCKDEP], they are not needed
testing commit efda22f3484c75674a2c4f22e4540e8289ead901 gcc
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
kernel signature: 03ff8b716eb263481c0cab6fc9c7885f95193966741499f9cc8fd5be69624d5b
run #0: basic kernel testing failed: lost connection to test machine
run #1: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super
run #2: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super
run #3: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super
run #4: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super
run #5: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super
run #6: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super
run #7: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super
run #8: crashed: UBSAN: shift-out-of-bounds in exfat_fill_super
run #9: 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 [ATOMIC_SLEEP HANG LEAK BUG KASAN LOCKDEP], they are not needed
testing commit efda22f3484c75674a2c4f22e4540e8289ead901 gcc
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
kernel signature: 299684797208c4cf1f1665c0f344b4b7d9f78ff45029f2cbdb00e91ceeef20d8
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 [HANG LEAK BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed
testing commit efda22f3484c75674a2c4f22e4540e8289ead901 gcc
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
failed building efda22f3484c75674a2c4f22e4540e8289ead901: ld.lld: error: undefined symbol: wext_proc_init
ld.lld: error: undefined symbol: wext_proc_exit
ld.lld: error: undefined symbol: wext_handle_ioctl
ld.lld: error: undefined symbol: compat_wext_handle_ioctl
minimized to 50 configs; suspects: [HID_ZEROPLUS 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_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 V4L2_ASYNC V4L2_FWNODE VIDEO_CAMERA_SENSOR WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_PURELIFI WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_SILABS WLAN_VENDOR_ZYDAS X86_X32_ABI ZEROPLUS_FF]
disabling configs for [HANG LEAK BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed
testing current HEAD 5b87067cdd87affdb34f233e8fdd7805249335e2
testing commit 5b87067cdd87affdb34f233e8fdd7805249335e2 gcc
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
kernel signature: 839e9249a1dffbf765a4621e285e29a51b178acc53843e2f591d4a172db50311
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: 54m40.793397566s (build: 27m24.040067737s, test: 23m40.829410378s)
crash still not fixed or there were kernel test errors
commit msg: UPSTREAM: mm/memcg: use kmem_cache when alloc memcg pernode info
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:529:38
shift exponent 185 is too large for 32-bit type 'int'
CPU: 0 PID: 687 Comm: syz.2.82 Not tainted 6.1.138-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack+0x19/0x1c lib/dump_stack.c:88
 dump_stack_lvl+0x5d/0x8c lib/dump_stack.c:106
 dump_stack+0x10/0x1c lib/dump_stack.c:113
 ubsan_epilogue+0x9/0x40 lib/ubsan.c:151
 __ubsan_handle_shift_out_of_bounds+0x1f8/0x200 lib/ubsan.c:321
 exfat_read_boot_sector fs/exfat/super.c:529 [inline]
 __exfat_fill_super fs/exfat/super.c:585 [inline]
 exfat_fill_super+0xaef/0xb10 fs/exfat/super.c:649
 get_tree_bdev+0x1d0/0x260 fs/super.c:1368
 exfat_get_tree+0x10/0x20 fs/exfat/super.c:721
 vfs_get_tree+0x2f/0x90 fs/super.c:1575
 do_new_mount+0x14a/0x360 fs/namespace.c:3057
 path_mount+0x324/0x550 fs/namespace.c:3387
 do_mount fs/namespace.c:3400 [inline]
 __do_sys_mount fs/namespace.c:3608 [inline]
 __se_sys_mount+0x141/0x1a0 fs/namespace.c:3585
 __x64_sys_mount+0x20/0x30 fs/namespace.c:3585
 x64_sys_call+0x65d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f28f998f90a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f28fa7d2e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f28fa7d2ef0 RCX: 00007f28f998f90a
RDX: 0000200000000000 RSI: 0000200000000240 RDI: 00007f28fa7d2eb0
RBP: 0000200000000000 R08: 00007f28fa7d2ef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000240
R13: 00007f28fa7d2eb0 R14: 00000000000014fe R15: 0000200000000600
 </TASK>
================================================================================
exFAT-fs (loop2): unable to set blocksize 33554432
exFAT-fs (loop2): failed to read boot sector
exFAT-fs (loop2): failed to recognize exfat type