netlink: 'syz-executor.7': attribute type 13 has an invalid length. ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.0/6566 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.0/6566: #0: ffff88800fdf03f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff8880096ec698 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800fdf4950 (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: 6566 Comm: syz-executor.0 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: 0033:0x7f8c4a31cc27 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:00007f8c47892fa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f8c4a31cc27 RDX: 0000000000000003 RSI: 00000000000001ff RDI: 0000000020000100 RBP: 00007f8c47893040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f8c47893000 R15: 00000000200000c0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.0/6566 Modules linked in: CPU: 1 UID: 0 PID: 6566 Comm: syz-executor.0 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:ffff88801e52f9e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88804b458000 RCX: ffffc9000088e000 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88804b4583fc RBP: ffff88804b458000 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804b458000 R13: 0000000000000001 R14: ffffffff85c0fe50 R15: ffff8880096ed8e0 FS: 00007f8c47893700(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d521000 CR3: 000000000d060000 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: 0033:0x7f8c4a31cc27 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:00007f8c47892fa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f8c4a31cc27 RDX: 0000000000000003 RSI: 00000000000001ff RDI: 0000000020000100 RBP: 00007f8c47893040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f8c47893000 R15: 00000000200000c0 irq event stamp: 1765 hardirqs last enabled at (1765): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (1764): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (1758): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (1756): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop1: detected capacity change from 0 to 256 netlink: 'syz-executor.7': attribute type 13 has an invalid length. netlink: 'syz-executor.5': attribute type 13 has an invalid length. loop0: detected capacity change from 0 to 256 syz_tun: refused to change device tx_queue_len loop1: detected capacity change from 0 to 256 netlink: 'syz-executor.2': attribute type 13 has an invalid length. netlink: 'syz-executor.4': attribute type 13 has an invalid length. syz_tun: refused to change device tx_queue_len netlink: 'syz-executor.6': attribute type 13 has an invalid length. netlink: 'syz-executor.7': attribute type 13 has an invalid length. FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 loop0: detected capacity change from 0 to 256 syz_tun: refused to change device tx_queue_len CPU: 1 UID: 0 PID: 6588 Comm: syz-executor.1 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 should_failslab+0xc2/0x120 kmem_cache_alloc_noprof+0x80/0x760 __kernfs_new_node+0xd3/0x940 kernfs_new_node+0x13c/0x1e0 __kernfs_create_file+0x55/0x360 sysfs_add_file_mode_ns+0x21c/0x430 internal_create_group+0x662/0xeb0 loop_configure+0xc46/0x15a0 lo_ioctl+0x674/0x1cb0 blkdev_ioctl+0x365/0x6d0 __x64_sys_ioctl+0x18f/0x210 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8b014a38d7 Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 a4 54 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 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:00007f8afea18f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8b014ed970 RCX: 00007f8b014a38d7 RDX: 0000000000000004 RSI: 0000000000004c00 RDI: 0000000000000005 RBP: 0000000000000005 R08: 0000000000000000 R09: ffffffffffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000004 R14: 0000000020000230 R15: 0000000000000002 netlink: 'syz-executor.4': attribute type 13 has an invalid length. netlink: 'syz-executor.5': attribute type 13 has an invalid length. netlink: 'syz-executor.7': attribute type 13 has an invalid length. syz_tun: refused to change device tx_queue_len FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 6599 Comm: syz-executor.5 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 should_failslab+0xc2/0x120 __kmalloc_noprof+0xd6/0x830 tun_device_event+0x185/0x1120 notifier_call_chain+0xc0/0x320 call_netdevice_notifiers_info+0xbe/0x110 netif_change_tx_queue_len+0x128/0x1e0 do_setlink.constprop.0+0xbc1/0x3e00 rtnl_newlink+0x1501/0x1f90 rtnetlink_rcv_msg+0x9c6/0xfc0 netlink_rcv_skb+0x147/0x430 netlink_unicast+0x5a7/0x870 netlink_sendmsg+0x8a3/0xd80 ____sys_sendmsg+0xa38/0xbf0 ___sys_sendmsg+0x10f/0x1b0 __sys_sendmsg+0x150/0x200 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7e70c05b19 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:00007f7e6e17b188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7e70d18f60 RCX: 00007f7e70c05b19 RDX: 0000000000000000 RSI: 0000000020000380 RDI: 0000000000000003 RBP: 00007f7e6e17b1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffd1cc6884f R14: 00007f7e6e17b300 R15: 0000000000022000 loop1: detected capacity change from 0 to 256 netlink: 'syz-executor.2': attribute type 13 has an invalid length. netlink: 'syz-executor.3': attribute type 13 has an invalid length. syz_tun: refused to change device tx_queue_len netlink: 'syz-executor.4': attribute type 13 has an invalid length. syz_tun: refused to change device tx_queue_len netlink: 'syz-executor.6': attribute type 13 has an invalid length. netlink: 'syz-executor.4': attribute type 13 has an invalid length. syz_tun: refused to change device tx_queue_len loop0: detected capacity change from 0 to 256 syz_tun: refused to change device tx_queue_len loop0: detected capacity change from 0 to 256 syz_tun: refused to change device tx_queue_len loop1: detected capacity change from 0 to 256 syz_tun: refused to change device tx_queue_len syz_tun: refused to change device tx_queue_len