./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1820644518

<...>
DUID 00:04:03:2c:e5:fc:a2:19:b8:8b:c5:bf:62:63:19:3a:75:c6
forked to background, child pid 4693
[   31.541983][ T4694] 8021q: adding VLAN 0 to HW filter on device bond0
[   31.551996][ T4694] eql: remember to turn off Van-Jacobson compression on your slave devices
Starting sshd: OK

syzkaller
Warning: Permanently added '10.128.0.138' (ECDSA) to the list of known hosts.
execve("./syz-executor1820644518", ["./syz-executor1820644518"], 0x7fff0759bc20 /* 10 vars */) = 0
brk(NULL)                               = 0x555556edb000
brk(0x555556edbc40)                     = 0x555556edbc40
arch_prctl(ARCH_SET_FS, 0x555556edb300) = 0
uname({sysname="Linux", nodename="syzkaller", ...}) = 0
readlink("/proc/self/exe", "/root/syz-executor1820644518", 4096) = 28
brk(0x555556efcc40)                     = 0x555556efcc40
brk(0x555556efd000)                     = 0x555556efd000
mprotect(0x7f0d2bb88000, 16384, PROT_READ) = 0
mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000
mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000
mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000
memfd_create("syzkaller", 0)            = 3
mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0d236c5000
write(3, "\xb5\x84\x31\x7b\xb6\x84\x31\x7b\xb7\x84\x31\x7b\xb8\x84\x31\x7b\xb9\x84\x31\x7b\xba\x84\x31\x7b\xbb\x84\x31\x7b\xbc\x84\x31\x7b\x42\x46\x53\x31\xbe\x84\x31\x7b\x00\x00\x10\x00\xc0\x84\x31\x7b\xc1\x84\x31\x7b\xc2\x84\x31\x7b\xc3\x84\x31\x7b\xc4\x84\x31\x7b\xc5\x84\x31\x7b\xdd\x12\x10\x31\xc7\x84\x31\x7b\xc8\x84\x31\x7b\xc9\x84\x31\x7b\xca\x84\x31\x7b\xcb\x84\x31\x7b\xcc\x84\x31\x7b\xcd\x84\x31\x7b"..., 65536) = 65536
munmap(0x7f0d236c5000, 65536)           = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = 4
ioctl(4, LOOP_SET_FD, 3)                = 0
close(3)                                = 0
mkdir("./file0", 0777)                  = 0
syzkaller login: [   56.687444][ T5024] memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5024 'syz-executor182'
[   56.704175][ T5024] loop0: detected capacity change from 0 to 128
[   56.716170][ T5024] ================================================================================
[   56.725602][ T5024] UBSAN: shift-out-of-bounds in fs/befs/super.c:96:9
[   56.732275][ T5024] shift exponent 3229888891 is too large for 32-bit type 'int'
[   56.740201][ T5024] CPU: 1 PID: 5024 Comm: syz-executor182 Not tainted 6.4.0-next-20230707-syzkaller #0
[   56.749836][ T5024] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
[   56.759995][ T5024] Call Trace:
[   56.763268][ T5024]  <TASK>
[   56.766193][ T5024]  dump_stack_lvl+0x136/0x150
[   56.770968][ T5024]  __ubsan_handle_shift_out_of_bounds+0x221/0x5a0
[   56.777556][ T5024]  ? sched_dl_overflow+0x11/0x1120
[   56.782662][ T5024]  befs_check_sb.cold+0x19/0x6f
[   56.787504][ T5024]  befs_fill_super+0x9b5/0x1110
[   56.792359][ T5024]  ? befs_symlink_read_folio+0x260/0x260
[   56.797993][ T5024]  ? vsprintf+0x30/0x30
[   56.802167][ T5024]  ? up_write+0x1b4/0x520
[   56.806534][ T5024]  ? set_blocksize+0x2d8/0x370
[   56.811322][ T5024]  mount_bdev+0x315/0x3e0
[   56.815747][ T5024]  ? befs_symlink_read_folio+0x260/0x260
[   56.821389][ T5024]  ? befs_bread_iaddr+0x430/0x430
[   56.826425][ T5024]  legacy_get_tree+0x109/0x220
[   56.831467][ T5024]  vfs_get_tree+0x8d/0x350
[   56.835891][ T5024]  path_mount+0x136e/0x1e70
[   56.840401][ T5024]  ? putname+0x102/0x140
[   56.844655][ T5024]  ? kmem_cache_free+0xf0/0x490
[   56.849515][ T5024]  ? finish_automount+0xa30/0xa30
[   56.854552][ T5024]  ? putname+0x102/0x140
[   56.858803][ T5024]  __x64_sys_mount+0x283/0x300
[   56.863574][ T5024]  ? copy_mnt_ns+0xb30/0xb30
[   56.868168][ T5024]  ? lockdep_hardirqs_on+0x7d/0x100
[   56.873376][ T5024]  ? _raw_spin_unlock_irq+0x2e/0x50
[   56.878587][ T5024]  ? ptrace_notify+0xfe/0x140
[   56.883271][ T5024]  do_syscall_64+0x39/0xb0
[   56.887783][ T5024]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   56.893683][ T5024] RIP: 0033:0x7f0d2bb12aea
[   56.898101][ T5024] Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
[   56.917723][ T5024] RSP: 002b:00007ffe1a1df6e8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
[   56.926144][ T5024] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0d2bb12aea
[   56.934115][ T5024] RDX: 0000000020000100 RSI: 0000000020009e40 RDI: 00007ffe1a1df6f0
[   56.942099][ T5024] RBP: 00007ffe1a1df6f0 R08: 00007ffe1a1df730 R09: 0000000000009e1f
[   56.950248][ T5024] R10: 0000000003008001 R11: 0000000000000282 R12: 0000000000000004
[   56.958222][ T5024] R13: 0000555556edb2c0 R14: 00007ffe1a1df730 R15: 0000000000000000
[   56.966209][ T5024]  </TASK>
[   56.969419][ T5024] ================================================================================
[   56.978829][ T5024] Kernel panic - not syncing: UBSAN: panic_on_warn set ...
[   56.986040][ T5024] CPU: 0 PID: 5024 Comm: syz-executor182 Not tainted 6.4.0-next-20230707-syzkaller #0
[   56.995582][ T5024] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
[   57.005646][ T5024] Call Trace:
[   57.008921][ T5024]  <TASK>
[   57.011841][ T5024]  dump_stack_lvl+0xd9/0x150
[   57.016431][ T5024]  panic+0x686/0x730
[   57.020322][ T5024]  ? panic_smp_self_stop+0xa0/0xa0
[   57.025455][ T5024]  ? syslog_print_all+0x3a0/0x3a0
[   57.030491][ T5024]  check_panic_on_warn+0xb1/0xc0
[   57.035483][ T5024]  __ubsan_handle_shift_out_of_bounds+0x249/0x5a0
[   57.041921][ T5024]  ? sched_dl_overflow+0x11/0x1120
[   57.047136][ T5024]  befs_check_sb.cold+0x19/0x6f
[   57.051984][ T5024]  befs_fill_super+0x9b5/0x1110
[   57.056834][ T5024]  ? befs_symlink_read_folio+0x260/0x260
[   57.062465][ T5024]  ? vsprintf+0x30/0x30
[   57.066622][ T5024]  ? up_write+0x1b4/0x520
[   57.070946][ T5024]  ? set_blocksize+0x2d8/0x370
[   57.075707][ T5024]  mount_bdev+0x315/0x3e0
[   57.080291][ T5024]  ? befs_symlink_read_folio+0x260/0x260
[   57.085914][ T5024]  ? befs_bread_iaddr+0x430/0x430
[   57.090930][ T5024]  legacy_get_tree+0x109/0x220
[   57.095702][ T5024]  vfs_get_tree+0x8d/0x350
[   57.100118][ T5024]  path_mount+0x136e/0x1e70
[   57.104622][ T5024]  ? putname+0x102/0x140
[   57.108868][ T5024]  ? kmem_cache_free+0xf0/0x490
[   57.113719][ T5024]  ? finish_automount+0xa30/0xa30
[   57.118737][ T5024]  ? putname+0x102/0x140
[   57.122971][ T5024]  __x64_sys_mount+0x283/0x300
[   57.127725][ T5024]  ? copy_mnt_ns+0xb30/0xb30
[   57.132303][ T5024]  ? lockdep_hardirqs_on+0x7d/0x100
[   57.137519][ T5024]  ? _raw_spin_unlock_irq+0x2e/0x50
[   57.142725][ T5024]  ? ptrace_notify+0xfe/0x140
[   57.147493][ T5024]  do_syscall_64+0x39/0xb0
[   57.151911][ T5024]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   57.157798][ T5024] RIP: 0033:0x7f0d2bb12aea
[   57.162203][ T5024] Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
[   57.181818][ T5024] RSP: 002b:00007ffe1a1df6e8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
[   57.190233][ T5024] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0d2bb12aea
[   57.198218][ T5024] RDX: 0000000020000100 RSI: 0000000020009e40 RDI: 00007ffe1a1df6f0
[   57.206197][ T5024] RBP: 00007ffe1a1df6f0 R08: 00007ffe1a1df730 R09: 0000000000009e1f
[   57.214172][ T5024] R10: 0000000003008001 R11: 0000000000000282 R12: 0000000000000004
[   57.222248][ T5024] R13: 0000555556edb2c0 R14: 00007ffe1a1df730 R15: 0000000000000000
[   57.230403][ T5024]  </TASK>
[   57.233685][ T5024] Kernel Offset: disabled
[   57.238091][ T5024] Rebooting in 86400 seconds..