WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.2/4683 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.2/4683: #0: ffff88800f6f63f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88804a49f640 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f77a950 (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: 0 UID: 0 PID: 4683 Comm: syz-executor.2 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_symlink+0x623/0xb40 vfs_symlink+0x44b/0x840 filename_symlinkat+0x158/0x440 __x64_sys_symlink+0x82/0x110 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f16ac71a427 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 58 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:00007ffef7358f28 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f16ac71a427 RDX: ffffffffffffffbc RSI: 00007f16ac77500e RDI: 00007f16ac7741dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffef73589a0 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffef7358ff0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.2/4683 Modules linked in: CPU: 0 UID: 0 PID: 4683 Comm: syz-executor.2 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:ffff88804afaf9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88801af60000 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88801af603fc RBP: ffff88801af60000 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801af60000 R13: 0000000000000001 R14: ffffffff85c0dec0 R15: ffff88801c3f8318 FS: 000055556a107400(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd9d468fd58 CR3: 000000000dc10000 CR4: 0000000000350ef0 Call Trace: __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_symlink+0x623/0xb40 vfs_symlink+0x44b/0x840 filename_symlinkat+0x158/0x440 __x64_sys_symlink+0x82/0x110 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f16ac71a427 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 58 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:00007ffef7358f28 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f16ac71a427 RDX: ffffffffffffffbc RSI: 00007f16ac77500e RDI: 00007f16ac7741dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffef73589a0 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffef7358ff0 irq event stamp: 609 hardirqs last enabled at (609): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (608): [] sysvec_call_function_single+0x18/0xc0 softirqs last enabled at (602): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (600): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO tmpfs: Bad value for 'mpol' loop0: detected capacity change from 0 to 264192 vfat: Unknown parameter '00000000000000000000004' program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO loop0: detected capacity change from 0 to 264192 vfat: Unknown parameter '00000000000000000000004' tmpfs: Bad value for 'mpol' program syz-executor.4 is using a deprecated SCSI ioctl, please convert it to SG_IO loop0: detected capacity change from 0 to 190 loop7: detected capacity change from 0 to 1024 Bluetooth: hci0: unexpected cc 0x2029 length: 0 < 1 Bluetooth: hci0: ACL packet for unknown connection handle 2745 Bluetooth: hci0: unexpected event 0x2f length: 763 > 260 Bluetooth: hci0: ISO packet for unknown connection handle 1106 Bluetooth: hci0: unexpected cc 0x2029 length: 0 < 1 Bluetooth: hci0: ACL packet for unknown connection handle 2745 loop0: detected capacity change from 0 to 190 EXT4-fs (loop7): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. ext4 filesystem being mounted at /syzkaller-testdir680868094/syzkaller.Z38f0T/9/file0 supports timestamps until 2038-01-19 (0x7fffffff) Bluetooth: hci0: unexpected event 0x2f length: 763 > 260 Bluetooth: hci0: ISO packet for unknown connection handle 1106 EXT4-fs (loop7): unmounting filesystem 00000000-0000-0000-0000-000000000000. tmpfs: Bad value for 'mpol'