===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260114 #1 Not tainted ------------------------------------- syz-executor.0/12974 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.0/12974: #0: ffff88800fc5a3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801ae6a078 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800fc5e950 (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: 12974 Comm: syz-executor.0 Not tainted 6.19.0-rc5-next-20260114 #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 do_symlinkat+0x153/0x440 __x64_sys_symlink+0x79/0xa0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6c261a0427 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:00007ffcdb4ff018 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6c261a0427 RDX: ffffffffffffffbc RSI: 00007f6c261fb00e RDI: 00007f6c261fa1dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffcdb4fea90 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffcdb4ff0e0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.0/12974 Modules linked in: CPU: 1 UID: 0 PID: 12974 Comm: syz-executor.0 Not tainted 6.19.0-rc5-next-20260114 #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 16 c0 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 24 74 03 e8 bc 5c 56 00 e9 RSP: 0018:ffff88800f6679a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888050239b80 RCX: ffffffff81565a27 RDX: 0000000000000000 RSI: ffffffff81565a30 RDI: ffff888050239f7c RBP: ffff888050239b80 R08: 0000000000000000 R09: fffffbfff0ba6ffc R10: 0000000000000000 R11: 0000000000000001 R12: ffff888050239b80 R13: 0000000000000001 R14: ffffffff85c0cc00 R15: ffff88801b19d8e0 FS: 000055555c339400(0000) GS:ffff8880e5443000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f279be98650 CR3: 0000000049aec000 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 do_symlinkat+0x153/0x440 __x64_sys_symlink+0x79/0xa0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6c261a0427 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:00007ffcdb4ff018 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6c261a0427 RDX: ffffffffffffffbc RSI: 00007f6c261fb00e RDI: 00007f6c261fa1dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffcdb4fea90 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffcdb4ff0e0 irq event stamp: 693 hardirqs last enabled at (693): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (692): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (686): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (684): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop6: detected capacity change from 0 to 140 EXT4-fs (loop6): VFS: Found ext4 filesystem with invalid superblock checksum. Run e2fsck? FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 13076 Comm: syz-executor.3 Tainted: G W 6.19.0-rc5-next-20260114 #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_to_iter+0x577/0x1690 seq_read_iter+0xdd2/0x1320 seq_read+0x375/0x540 proc_reg_read+0x22e/0x310 vfs_readv+0x612/0x7f0 do_preadv+0x1ab/0x280 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc5f8e97b19 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:00007fc5f640d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007fc5f8faaf60 RCX: 00007fc5f8e97b19 RDX: 0000000000000001 RSI: 00000000200001c0 RDI: 0000000000000004 RBP: 00007fc5f640d1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffdf227e72f R14: 00007fc5f640d300 R15: 0000000000022000 loop4: detected capacity change from 0 to 140 loop6: detected capacity change from 0 to 140 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 13093 Comm: syz-executor.0 Tainted: G W 6.19.0-rc5-next-20260114 #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 inet_bind2_bucket_create+0x36/0x600 __inet_hash_connect+0x132c/0x1b60 tcp_v6_connect+0x12d7/0x1bb0 __inet_stream_connect+0x3a5/0xed0 inet_stream_connect+0x57/0xa0 __sys_connect_file+0x14b/0x1b0 __sys_connect+0x161/0x1a0 __x64_sys_connect+0x73/0xb0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6c261a0b19 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:00007f6c23716188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f6c262b3f60 RCX: 00007f6c261a0b19 RDX: 000000000000001c RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00007f6c237161d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffcdb4fedcf R14: 00007f6c23716300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 EXT4-fs (loop4): VFS: Found ext4 filesystem with invalid superblock checksum. Run e2fsck? EXT4-fs (loop6): VFS: Found ext4 filesystem with invalid superblock checksum. Run e2fsck? CPU: 0 UID: 0 PID: 13092 Comm: syz-executor.3 Tainted: G W 6.19.0-rc5-next-20260114 #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_to_user+0x32/0xd0 simple_read_from_buffer+0xe0/0x180 proc_fail_nth_read+0x18a/0x240 vfs_read+0x1eb/0xc70 ksys_read+0x121/0x240 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc5f8e4a69c Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 fc ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 2f fd ff ff 48 RSP: 002b:00007fc5f640d170 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000000000005e RCX: 00007fc5f8e4a69c RDX: 000000000000000f RSI: 00007fc5f640d1e0 RDI: 0000000000000005 RBP: 00007fc5f640d1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffdf227e72f R14: 00007fc5f640d300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 13243 Comm: syz-executor.0 Tainted: G W 6.19.0-rc5-next-20260114 #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_node_noprof+0x87/0x730 __alloc_skb+0x159/0x440 tcp_stream_alloc_skb+0x36/0x680 tcp_connect+0xdae/0x4de0 tcp_v6_connect+0x14eb/0x1bb0 __inet_stream_connect+0x3a5/0xed0 inet_stream_connect+0x57/0xa0 __sys_connect_file+0x14b/0x1b0 __sys_connect+0x161/0x1a0 __x64_sys_connect+0x73/0xb0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6c261a0b19 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:00007f6c23716188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f6c262b3f60 RCX: 00007f6c261a0b19 RDX: 000000000000001c RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00007f6c237161d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffcdb4fedcf R14: 00007f6c23716300 R15: 0000000000022000