EXT4-fs (loop0): unmounting filesystem 00000000-0000-0000-0000-000000000000. ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.4/4118 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: 4 locks held by syz-executor.4/4118: #0: ffff88800f9423f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff8880489decb8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f946950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe32/0x12d0 #3: ffffffff85c16898 (inode_hash_lock){+.+.}-{3:3}, at: insert_inode_locked+0xf9/0x890 stack backtrace: CPU: 1 UID: 0 PID: 4118 Comm: syz-executor.4 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_mkdir+0x331/0xb30 vfs_mkdir+0x6d8/0xc00 filename_mkdirat+0x118/0x430 __x64_sys_mkdir+0x6e/0xd0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f169cfb2c27 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 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:00007f169a528fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f169cfb2c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000020000040 RBP: 00007f169a529040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000020000040 R14: 00007f169a529000 R15: 0000000000000000 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.4/4118 Modules linked in: CPU: 1 UID: 0 PID: 4118 Comm: syz-executor.4 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:ffff88804aef79e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff8880164f8000 RCX: ffffc9000ac5f000 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff8880164f83fc RBP: ffff8880164f8000 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880164f8000 R13: 0000000000000001 R14: ffffffff85c0f720 R15: ffff88804899bc48 FS: 00007f169a529700(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f169a528fe8 CR3: 0000000048e38000 CR4: 0000000000350ef0 Call Trace: __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_mkdir+0x331/0xb30 vfs_mkdir+0x6d8/0xc00 filename_mkdirat+0x118/0x430 __x64_sys_mkdir+0x6e/0xd0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f169cfb2c27 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 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:00007f169a528fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f169cfb2c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000020000040 RBP: 00007f169a529040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000020000040 R14: 00007f169a529000 R15: 0000000000000000 irq event stamp: 101 hardirqs last enabled at (101): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (100): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (96): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (94): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop0: detected capacity change from 0 to 2048 EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. EXT4-fs (loop0): unmounting filesystem 00000000-0000-0000-0000-000000000000. EXT4-fs (loop7): unmounting filesystem 00000000-0000-0000-0000-000000000000. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. loop4: detected capacity change from 0 to 2048 loop7: detected capacity change from 0 to 4096 loop2: detected capacity change from 0 to 264192 EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. loop2: detected capacity change from 0 to 264192 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. EXT4-fs (loop7): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. EXT4-fs (loop4): unmounting filesystem 00000000-0000-0000-0000-000000000000. loop2: detected capacity change from 0 to 3504 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop7): unmounting filesystem 00000000-0000-0000-0000-000000000000.