===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.6/286 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.6/286: #0: ffff88800f85e3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801b91f640 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f8ba950 (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: 286 Comm: syz-executor.6 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: 0033:0x7efe092e5c27 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:00007ffc08d03768 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffc08d037f0 RCX: 00007efe092e5c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007ffc08d037f0 RBP: 00007ffc08d037cc R08: 0000000000000000 R09: 0000000000000003 R10: 00007ffc08d03507 R11: 0000000000000202 R12: 0000000000000032 R13: 0000000000021515 R14: 0000000000000014 R15: 00007ffc08d03830 ------------[ cut here ]------------ ------------[ cut here ]------------ WARNING: kernel/rcu/tree_exp.h:803 at rcu_exp_handler+0x12b/0x570, CPU#1: syz-executor.6/286 Modules linked in: CPU: 1 UID: 0 PID: 286 Comm: syz-executor.6 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_exp_handler+0x12b/0x570 Code: 03 0f b6 04 02 4c 89 e2 83 e2 07 38 d0 7f 08 84 c0 0f 85 cb 03 00 00 0f b6 43 11 84 c0 75 b6 85 c9 74 1d 0f 8f bf 00 00 00 90 <0f> 0b 90 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f e9 6f d7 74 03 RSP: 0018:ffff88806cf085f0 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffff88806cf38800 RCX: 00000000ffffffff RDX: 0000000000000001 RSI: ffff888018cad280 RDI: ffff888018cad67c RBP: ffffffff85e31300 R08: 0000000000000000 R09: fffffbfff0ccdd0a R10: 0000000000000001 R11: 0000000000000000 R12: ffff88806cf38811 R13: ffff88806cf38828 R14: ffffffff85e31378 R15: ffff88806cf38820 FS: 000055555df77400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2cd22000 CR3: 000000000e240000 CR4: 0000000000350ef0 Call Trace: __flush_smp_call_function_queue+0x47e/0xef0 __sysvec_call_function_single+0x6d/0x310 sysvec_call_function_single+0x5f/0xc0 asm_sysvec_call_function_single+0x1a/0x20 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x80 Code: 5d 41 5c 41 5d e9 80 3f 5c 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 0f 1e fa 48 8b 34 24 65 48 8b 15 a8 5d 38 06 65 8b 05 b9 5d 38 RSP: 0018:ffff88806cf08768 EFLAGS: 00000283 RAX: 0000000000000000 RBX: ffffffff86678160 RCX: ffffffff84c54bdf RDX: ffff888018cad280 RSI: ffffffff84c54be9 RDI: 0000000000000006 RBP: ffffffff81251f8a R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81251f8a R11: 0000000000000000 R12: ffffffff815d742f R13: dffffc0000000000 R14: 0000000000000002 R15: 000000000000000b __report_bug+0x49d/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 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:ffff88806cf089c0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888018cad280 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8135f8c2 RDI: ffff888018cad67c RBP: ffff888018cad280 R08: 0000000000000001 R09: ffff88806cf08aa0 R10: 000000000003d20b R11: 0000000000031b77 R12: ffff888018cad280 R13: ffff88806cf08aa8 R14: ffff88801a97fcb0 R15: ffff88806cf08a60 unwind_next_frame+0x3bc/0x2540 arch_stack_walk+0x86/0xf0 stack_trace_save+0x8e/0xc0 kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x43/0x70 kmem_cache_free+0x2cd/0x670 rcu_core+0x543/0x1b30 handle_softirqs+0x1b1/0x7d0 __irq_exit_rcu+0xc4/0x100 irq_exit_rcu+0x9/0x20 sysvec_apic_timer_interrupt+0x70/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:console_flush_one_record+0x900/0xb70 Code: 8b 04 24 48 c1 e8 03 42 80 3c 38 00 0f 85 53 02 00 00 4d 89 65 58 e9 41 ff ff ff e8 da dc 1f 00 e8 d5 58 28 00 fb 48 8b 04 24 <48> c1 e8 03 42 80 3c 38 00 0f 84 1f ff ff ff 48 8b 3c 24 e8 08 2b RSP: 0018:ffff88801a97f418 EFLAGS: 00000246 RAX: ffffffff86155b78 RBX: 0000000000000001 RCX: ffffffff817dfeab RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8155a58b RBP: ffff88801a97f578 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff8666e857 R11: 000000002d2d2d2d R12: 0000000000000200 R13: ffffffff86155b20 R14: 0000000000000000 R15: dffffc0000000000 __console_flush_and_unlock+0xb1/0x1d0 vprintk_emit+0x4b5/0x680 _printk+0xbe/0xf0 __report_bug+0x322/0x5b0 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 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:ffff88801a97f9e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888018cad280 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff888018cad67c RBP: ffff888018cad280 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888018cad280 R13: 0000000000000001 R14: ffffffff85c10a80 R15: ffff88801bbd1628 __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: 0033:0x7efe092e5c27 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:00007ffc08d03768 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffc08d037f0 RCX: 00007efe092e5c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007ffc08d037f0 RBP: 00007ffc08d037cc R08: 0000000000000000 R09: 0000000000000003 R10: 00007ffc08d03507 R11: 0000000000000202 R12: 0000000000000032 R13: 0000000000021515 R14: 0000000000000014 R15: 00007ffc08d03830 irq event stamp: 155921 hardirqs last enabled at (155921): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (155920): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (155916): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (155914): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.6/286 Modules linked in: CPU: 1 UID: 0 PID: 286 Comm: syz-executor.6 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 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:ffff88801a97f9e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888018cad280 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff888018cad67c RBP: ffff888018cad280 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888018cad280 R13: 0000000000000001 R14: ffffffff85c10a80 R15: ffff88801bbd1628 FS: 000055555df77400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2cd22000 CR3: 000000000e240000 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: 0033:0x7efe092e5c27 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:00007ffc08d03768 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffc08d037f0 RCX: 00007efe092e5c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007ffc08d037f0 RBP: 00007ffc08d037cc R08: 0000000000000000 R09: 0000000000000003 R10: 00007ffc08d03507 R11: 0000000000000202 R12: 0000000000000032 R13: 0000000000021515 R14: 0000000000000014 R15: 00007ffc08d03830 irq event stamp: 155921 hardirqs last enabled at (155921): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (155920): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (155916): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (155914): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- tmpfs: Bad value for 'uid' tmpfs: Bad value for 'uid' mmap: syz-executor.6 (3982): VmData 37515264 exceed data ulimit 0. Update limits or use boot option ignore_rlimit_data. EXT4-fs (loop0): unable to read superblock EXT4-fs (loop0): unable to read superblock ---------------- Code disassembly (best guess): 0: 5d pop %rbp 1: 41 5c pop %r12 3: 41 5d pop %r13 5: e9 80 3f 5c 03 jmpq 0x35c3f8a a: 48 c7 c0 f4 ff ff ff mov $0xfffffffffffffff4,%rax 11: eb 92 jmp 0xffffffa5 13: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop 28: 90 nop 29: 90 nop * 2a: f3 0f 1e fa endbr64 <-- trapping instruction 2e: 48 8b 34 24 mov (%rsp),%rsi 32: 65 48 8b 15 a8 5d 38 mov %gs:0x6385da8(%rip),%rdx # 0x6385de2 39: 06 3a: 65 gs 3b: 8b .byte 0x8b 3c: 05 .byte 0x5 3d: b9 .byte 0xb9 3e: 5d pop %rbp 3f: 38 .byte 0x38