===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.1/280 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.1/280: #0: ffff88800fa3c3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801b14e330 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800fa48950 (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: 280 Comm: syz-executor.1 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: 0033:0x7f0612590c27 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:00007fff2eda2b08 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fff2eda2b90 RCX: 00007f0612590c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007fff2eda2b90 RBP: 00007fff2eda2b6c R08: 0000000000000000 R09: 0000000000000004 R10: 00007fff2eda28a6 R11: 0000000000000202 R12: 0000000000000032 R13: 000000000007d770 R14: 0000000000000006 R15: 00007fff2eda2bd0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.1/280 Modules linked in: CPU: 1 UID: 0 PID: 280 Comm: syz-executor.1 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:ffff88800a0d79e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888016f91b80 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff888016f91f7c RBP: ffff888016f91b80 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888016f91b80 R13: 0000000000000001 R14: ffffffff85c0d650 R15: ffff888047b20ca0 FS: 000055555622c400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffde9509ff8 CR3: 000000000e24e000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 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: 0033:0x7f0612590c27 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:00007fff2eda2b08 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fff2eda2b90 RCX: 00007f0612590c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007fff2eda2b90 RBP: 00007fff2eda2b6c R08: 0000000000000000 R09: 0000000000000004 R10: 00007fff2eda28a6 R11: 0000000000000202 R12: 0000000000000032 R13: 000000000007d770 R14: 0000000000000006 R15: 00007fff2eda2bd0 irq event stamp: 477155 hardirqs last enabled at (477155): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (477154): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (477150): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (477148): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 CPU: 0 UID: 0 PID: 5964 Comm: syz-executor.7 Tainted: G W 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Tainted: [W]=WARN 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 _copy_from_iter+0x27b/0x1610 copy_page_from_iter+0xe3/0x180 tun_build_skb+0x2cf/0x14f0 tun_get_user+0x1536/0x39e0 tun_chr_write_iter+0xd9/0x1e0 vfs_write+0xbe9/0x1150 ksys_write+0x121/0x240 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb0af5365ff Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 cc fd ff ff 48 RSP: 002b:00007fb0acaf9150 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fb0af696f60 RCX: 00007fb0af5365ff RDX: 0000000000000086 RSI: 0000000020000040 RDI: 00000000000000f0 RBP: 00007fb0acaf91d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007ffd9bdf8f8f R14: 00007fb0acaf9300 R15: 0000000000022000