===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260113 #1 Not tainted ------------------------------------- syz-executor.2/6085 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.2/6085: #0: ffff88800faea3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88800960d9a8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800faee950 (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: 6085 Comm: syz-executor.2 Not tainted 6.19.0-rc5-next-20260113 #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+0x406/0xb40 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: 0033:0x7f9ffd0ed427 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:00007ffe4b913248 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9ffd0ed427 RDX: 00007ffe4b913327 RSI: 00007f9ffd148019 RDI: 00007ffe4b913310 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe4b9130e0 R10: 00007ffe4b912f97 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffe4b913310 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.2/6085 Modules linked in: CPU: 1 UID: 0 PID: 6085 Comm: syz-executor.2 Not tainted 6.19.0-rc5-next-20260113 #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 a6 bb de ff 4d 85 f6 0f 84 73 fe ff ff e8 38 89 20 00 fb e9 68 fe ff ff 90 <0f> 0b 90 5b 5d 41 5c 41 5d 41 5e e9 61 f9 73 03 e8 0c 88 56 00 e9 RSP: 0018:ffff88806cf08c10 EFLAGS: 00010086 RAX: 00000000ffffffff RBX: ffff888019e69b80 RCX: 000000000000000d RDX: 0000000000000000 RSI: ffffffff85e25d40 RDI: ffff888019e69f7c RBP: ffff888019e69b80 R08: ffffffff84e98ac0 R09: 0000000000000000 R10: ffffffff8666eb57 R11: ffff88800a45b768 R12: ffff888019e69b80 R13: 0000000000000008 R14: 0000000000000001 R15: ffff88800a45b700 FS: 0000555571e58400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9ffd16d542 CR3: 000000004d1b8000 CR4: 0000000000350ef0 Call Trace: select_task_rq_fair+0x496/0x3870 try_to_wake_up+0x51b/0x1680 hrtimer_wakeup+0x47/0x60 __hrtimer_run_queues+0x1ee/0xbb0 hrtimer_interrupt+0x369/0x830 __sysvec_apic_timer_interrupt+0xbb/0x300 sysvec_apic_timer_interrupt+0x6b/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x80 Code: 5b 03 48 c7 c0 f4 ff ff ff eb 92 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 34 24 <65> 48 8b 15 48 5e 38 06 65 8b 05 59 5e 38 06 a9 00 01 ff 00 74 27 RSP: 0018:ffff88804d5ff748 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffffff86681eb0 RCX: ffffffff84c4fbdf RDX: ffff888019e69b80 RSI: ffffffff84c4fbe9 RDI: 0000000000000006 RBP: ffffffff81571512 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81571512 R11: 0000000000000000 R12: ffffffff815d780f R13: dffffc0000000000 R14: 0000000000000002 R15: 000000000000000b __report_bug+0x4d9/0x5b0 report_bug+0x7c/0x120 handle_bug+0x2e8/0x4f0 exc_invalid_op+0x35/0x80 asm_exc_invalid_op+0x1a/0x20 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 a6 bb de ff 4d 85 f6 0f 84 73 fe ff ff e8 38 89 20 00 fb e9 68 fe ff ff 90 <0f> 0b 90 5b 5d 41 5c 41 5d 41 5e e9 61 f9 73 03 e8 0c 88 56 00 e9 RSP: 0018:ffff88804d5ff9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888019e69b80 RCX: ffffffff815664c7 RDX: 0000000000000000 RSI: ffffffff815664d0 RDI: ffff888019e69f7c RBP: ffff888019e69b80 R08: 0000000000000000 R09: fffffbfff0ba6ff4 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888019e69b80 R13: 0000000000000001 R14: ffffffff85c10800 R15: ffff88804aa0e268 __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_symlink+0x406/0xb40 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: 0033:0x7f9ffd0ed427 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:00007ffe4b913248 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9ffd0ed427 RDX: 00007ffe4b913327 RSI: 00007f9ffd148019 RDI: 00007ffe4b913310 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe4b9130e0 R10: 00007ffe4b912f97 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffe4b913310 irq event stamp: 163 hardirqs last enabled at (163): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (162): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (158): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (156): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 6124 Comm: syz-executor.4 Tainted: G W 6.19.0-rc5-next-20260113 #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 skb_clone+0x191/0x400 raw6_local_deliver+0x373/0x900 ip6_protocol_deliver_rcu+0x1e7/0x1150 ip6_input_finish+0x1e1/0x4a0 ip6_input+0x10b/0x300 ipv6_rcv+0x161/0x500 __netif_receive_skb_one_core+0x12d/0x1e0 __netif_receive_skb+0x1d/0x160 netif_receive_skb+0x122/0x6d0 tun_rx_batched.isra.0+0x45c/0x710 tun_get_user+0x1bf9/0x39e0 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: 0033:0x7f831c98f5ff 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:00007f8319f52150 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f831caeff60 RCX: 00007f831c98f5ff RDX: 0000000000000066 RSI: 0000000020000180 RDI: 00000000000000f0 RBP: 00007f8319f521d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007ffcdef3f3ef R14: 00007f8319f52300 R15: 0000000000022000 sr 1:0:0:0: [sr0] tag#0 unaligned transfer blk_print_req_error: 23 callbacks suppressed I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x800000 phys_seg 1 prio class 2 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 48 c7 c0 f4 ff ff ff mov $0xfffffffffffffff4,%rax 7: eb 92 jmp 0xffffff9b 9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: f3 0f 1e fa endbr64 24: 48 8b 34 24 mov (%rsp),%rsi * 28: 65 48 8b 15 48 5e 38 mov %gs:0x6385e48(%rip),%rdx # 0x6385e78 <-- trapping instruction 2f: 06 30: 65 8b 05 59 5e 38 06 mov %gs:0x6385e59(%rip),%eax # 0x6385e90 37: a9 00 01 ff 00 test $0xff0100,%eax 3c: 74 27 je 0x65