WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.1/4489 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.1/4489: #0: ffff88800f63c3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88804a166cb8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f648950 (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: 4489 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_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: 0033:0x7f889adba427 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:00007ffdca47ca38 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f889adba427 RDX: ffffffffffffffbc RSI: 00007f889ae1500e RDI: 00007f889ae141dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffdca47c4b0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffdca47cb00 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.1/4489 Modules linked in: CPU: 0 UID: 0 PID: 4489 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:ffff88806ce08cb8 EFLAGS: 00010086 RAX: 00000000ffffffff RBX: ffff8880196eb700 RCX: 0000000000000005 RDX: 0000000000000000 RSI: ffffffff85e25fc0 RDI: ffff8880196ebafc RBP: ffff8880196eb700 R08: ffffffff81893b1d R09: ffffffff84e98ac0 R10: 0000000000000000 R11: 000000000000013b R12: ffff8880196eb700 R13: 0000000000000000 R14: ffff88806ce379c0 R15: ffff88806ce37a20 FS: 0000555565ae4400(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2da20000 CR3: 000000000d9ce000 CR4: 0000000000350ef0 Call Trace: sched_tick+0x232/0x6e0 update_process_times+0x116/0x210 tick_nohz_handler+0x4ff/0x8c0 __hrtimer_run_queues+0x654/0xbb0 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:__report_bug+0x4be/0x5b0 Code: 75 3e eb 5e e8 b3 36 b0 fc 48 89 d8 48 c1 e8 03 42 0f b6 14 28 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 b0 00 00 00 <48> 63 2b 4c 89 e7 48 01 dd 48 89 ee e8 11 31 b0 fc 49 39 ec 74 22 RSP: 0018:ffff888049787750 EFLAGS: 00000246 RAX: 0000000000000003 RBX: ffffffff866821f0 RCX: ffffffff84c54bdf RDX: 0000000000000000 RSI: ffffffff84c54bad RDI: 0000000000000006 RBP: ffffffff8159b9e8 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff8159b9e8 R11: 0000000000000000 R12: ffffffff815d742f R13: dffffc0000000000 R14: 0000000000000002 R15: 000000000000000b 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 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:ffff8880497879a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff8880196eb700 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff8880196ebafc RBP: ffff8880196eb700 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880196eb700 R13: 0000000000000001 R14: ffffffff85c0cac0 R15: ffff88804a1bf578 __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: 0033:0x7f889adba427 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:00007ffdca47ca38 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f889adba427 RDX: ffffffffffffffbc RSI: 00007f889ae1500e RDI: 00007f889ae141dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffdca47c4b0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffdca47cb00 irq event stamp: 1721 hardirqs last enabled at (1721): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (1720): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (1716): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (1714): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. loop3: detected capacity change from 0 to 512 netlink: 'syz-executor.3': attribute type 1 has an invalid length. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. audit: type=1400 audit(1768637276.610:12): avc: denied { tracepoint } for pid=4511 comm="syz-executor.4" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 EXT4-fs (loop3): unmounting filesystem 00000000-0000-0000-0000-000000000000. ---------------- Code disassembly (best guess): 0: 75 3e jne 0x40 2: eb 5e jmp 0x62 4: e8 b3 36 b0 fc callq 0xfcb036bc 9: 48 89 d8 mov %rbx,%rax c: 48 c1 e8 03 shr $0x3,%rax 10: 42 0f b6 14 28 movzbl (%rax,%r13,1),%edx 15: 48 89 d8 mov %rbx,%rax 18: 83 e0 07 and $0x7,%eax 1b: 83 c0 03 add $0x3,%eax 1e: 38 d0 cmp %dl,%al 20: 7c 08 jl 0x2a 22: 84 d2 test %dl,%dl 24: 0f 85 b0 00 00 00 jne 0xda * 2a: 48 63 2b movslq (%rbx),%rbp <-- trapping instruction 2d: 4c 89 e7 mov %r12,%rdi 30: 48 01 dd add %rbx,%rbp 33: 48 89 ee mov %rbp,%rsi 36: e8 11 31 b0 fc callq 0xfcb0314c 3b: 49 39 ec cmp %rbp,%r12 3e: 74 22 je 0x62