isofs_fill_super: bread failed, dev=loop4, iso_blknum=16, block=32 ================================================ WARNING: lock held when returning to user space! 6.18.0-rc7-next-20251127 #1 Not tainted ------------------------------------------------ syz-executor.7/6353 is leaving the kernel with locks still held! 1 lock held by syz-executor.7/6353: #0: ffff88800b5095c8 (&sb->s_type->i_mutex_key#22/1){+.+.}-{4:4}, at: start_creating_noperm+0x84/0xd0 tmpfs: Unknown parameter '00000000000000000003' tmpfs: Unknown parameter '00000000000000000003' FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 CPU: 0 UID: 0 PID: 6370 Comm: syz-executor.4 Not tainted 6.18.0-rc7-next-20251127 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xfa/0x120 should_fail_ex+0x4d7/0x5e0 strncpy_from_user+0x3b/0x2f0 __do_sys_memfd_create+0x21d/0xaa0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f75132deb19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7510853f48 EFLAGS: 00000246 ORIG_RAX: 000000000000013f RAX: ffffffffffffffda RBX: 0000000020000080 RCX: 00007f75132deb19 RDX: 00007f7510854000 RSI: 0000000000000000 RDI: 00007f75133380fb RBP: 0000000000000000 R08: 00007f7510853ff8 R09: ffffffffffffffff R10: 00007f7510853ffc R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000040 R14: 0000000000000000 R15: 0000000020000200