EXT4-fs (loop5): VFS: Can't find ext4 filesystem ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.5/4576 is trying to release lock (rcu_read_lock) at: [] __wait_on_freeing_inode+0x105/0x350 but there are no more locks to release! other info that might help us debug this: 3 locks held by syz-executor.5/4576: #0: ffff88800f6d43f8 (sb_writers#3){.+.+}-{0:0}, at: path_openat+0x17c3/0x2d60 #1: ffff88800f8c8950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe32/0x12d0 #2: ffffffff85c16898 (inode_hash_lock){+.+.}-{3:3}, at: insert_inode_locked+0xf9/0x890 stack backtrace: CPU: 0 UID: 0 PID: 4576 Comm: syz-executor.5 Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xca/0x120 print_unlock_imbalance_bug+0x118/0x130 lock_release+0x1ee/0x270 __wait_on_freeing_inode+0x10a/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_tmpfile+0x1e2/0x4c0 vfs_tmpfile+0x2c6/0x9a0 path_openat+0x1852/0x2d60 do_file_open+0x209/0x460 do_sys_openat2+0xe7/0x210 __x64_sys_open+0x11c/0x1c0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fef0988cb19 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:00007fef06e02188 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fef0999ff60 RCX: 00007fef0988cb19 RDX: 0000000000000000 RSI: 83c1e749214190be RDI: 0000000020000040 RBP: 00007fef098e6f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec220a81f R14: 00007fef06e02300 R15: 0000000000022000 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.5/4576 Modules linked in: CPU: 0 UID: 0 PID: 4576 Comm: syz-executor.5 Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__rcu_read_unlock+0x25f/0x5c0 Code: f2 02 00 00 c7 43 58 01 00 00 00 bf 09 00 00 00 e8 d6 b7 de ff 4d 85 f6 0f 84 73 fe ff ff e8 38 8a 20 00 fb e9 68 fe ff ff 90 <0f> 0b 90 5b 5d 41 5c 41 5d 41 5e e9 81 4d 74 03 e8 2c 5d 56 00 e9 RSP: 0018:ffff88804a51f658 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88801f8e9b80 RCX: ffffc90002bf3000 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88801f8e9f7c RBP: ffff88801f8e9b80 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801f8e9b80 R13: 0000000000000001 R14: ffffffff85c0d010 R15: ffff888049856268 FS: 00007fef06e02700(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fef09913b89 CR3: 000000001e363000 CR4: 0000000000350ef0 Call Trace: __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_tmpfile+0x1e2/0x4c0 vfs_tmpfile+0x2c6/0x9a0 path_openat+0x1852/0x2d60 do_file_open+0x209/0x460 do_sys_openat2+0xe7/0x210 __x64_sys_open+0x11c/0x1c0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fef0988cb19 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:00007fef06e02188 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fef0999ff60 RCX: 00007fef0988cb19 RDX: 0000000000000000 RSI: 83c1e749214190be RDI: 0000000020000040 RBP: 00007fef098e6f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec220a81f R14: 00007fef06e02300 R15: 0000000000022000 irq event stamp: 1241 hardirqs last enabled at (1241): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (1240): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (1236): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (1234): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. loop5: detected capacity change from 0 to 512 EXT4-fs (loop5): VFS: Can't find ext4 filesystem UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16