===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260114 #1 Not tainted ------------------------------------- syz-executor.1/4826 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.1/4826: #0: ffff88800f8ec3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801c3e16f0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f8f8950 (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: 4826 Comm: syz-executor.1 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: 0033:0x7f5b8e813427 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:00007ffe2b3d58e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5b8e813427 RDX: 00007ffe2b3d59c3 RSI: 00007f5b8e86e02f RDI: 00007ffe2b3d59b0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe2b3d5780 R10: 00007ffe2b3d5637 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffe2b3d59b0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.1/4826 Modules linked in: CPU: 0 UID: 0 PID: 4826 Comm: syz-executor.1 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:ffff888048f879a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff8880198b3700 RCX: ffffffff81565a27 RDX: 0000000000000000 RSI: ffffffff81565a30 RDI: ffff8880198b3afc RBP: ffff8880198b3700 R08: 0000000000000000 R09: fffffbfff0ba6ffc R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880198b3700 R13: 0000000000000001 R14: ffffffff85c0c5c0 R15: ffff88801c3d0318 FS: 0000555592af4400(0000) GS:ffff8880e5343000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5b8e893541 CR3: 000000000c5d3000 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: 0033:0x7f5b8e813427 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:00007ffe2b3d58e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5b8e813427 RDX: 00007ffe2b3d59c3 RSI: 00007f5b8e86e02f RDI: 00007ffe2b3d59b0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe2b3d5780 R10: 00007ffe2b3d5637 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffe2b3d59b0 irq event stamp: 411 hardirqs last enabled at (411): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (410): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (406): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (404): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- sg_write: data in/out 1819633163/4 bytes for SCSI command 0x0-- guessing data in; program syz-executor.3 not setting count and/or reply_len properly loop0: detected capacity change from 0 to 63 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_exp.h:803 at rcu_exp_handler+0x12b/0x570, CPU#1: syz-executor.1/4826 Modules linked in: CPU: 1 UID: 0 PID: 4826 Comm: syz-executor.1 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 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 ae 74 03 RSP: 0018:ffff88806cf08f50 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffff88806cf38800 RCX: 00000000ffffffff RDX: 0000000000000001 RSI: ffff8880198b3700 RDI: ffff8880198b3afc RBP: ffffffff85e310c0 R08: 0000000000000000 R09: fffffbfff0ccdc6a R10: 0000000000000001 R11: ffff88806cf08ff8 R12: ffff88806cf38811 R13: ffff88806cf38828 R14: ffffffff85e31138 R15: ffff88806cf38820 FS: 0000555592af4400(0000) GS:ffff8880e5443000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d630000 CR3: 000000000c5d3000 CR4: 0000000000350ef0 Call Trace: __flush_smp_call_function_queue+0x47e/0xef0 __sysvec_call_function_single+0x6d/0x310 sysvec_call_function_single+0xa1/0xc0 asm_sysvec_call_function_single+0x1a/0x20 RIP: 0010:finish_task_switch.isra.0+0x204/0x840 Code: e7 48 c7 03 00 00 00 00 e8 d9 aa 89 03 4d 85 f6 75 ba 49 8d 7c 24 48 e8 3a 8d 89 03 e8 45 1b 36 00 fb 65 48 8b 1d b4 f3 65 06 <48> 8d bb b8 14 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffff888048f877f8 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffff8880198b3700 RCX: ffffffff817df7eb RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8147dc5b RBP: ffff888048f87840 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff8666e357 R11: 0000000000000000 R12: ffff88806cf379c0 R13: ffff88801ed1d280 R14: ffff88806ce37a20 R15: 0000000040000001 __schedule+0xfb9/0x4680 preempt_schedule+0x4d/0x80 preempt_schedule_thunk+0x16/0x30 _raw_spin_unlock+0x32/0x40 FAT-fs (loop0): bogus number of reserved sectors __wait_on_freeing_inode+0x2e2/0x350 FAT-fs (loop0): Can't find a valid FAT filesystem 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: 0033:0x7f5b8e813427 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:00007ffe2b3d58e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5b8e813427 RDX: 00007ffe2b3d59c3 RSI: 00007f5b8e86e02f RDI: 00007ffe2b3d59b0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe2b3d5780 R10: 00007ffe2b3d5637 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffe2b3d59b0 irq event stamp: 411 hardirqs last enabled at (411): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (410): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (406): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (404): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop7: detected capacity change from 0 to 4096 ext4: Unknown parameter 'Ì_º€wI§Œ)QE' loop7: detected capacity change from 0 to 4096 ext4: Unknown parameter 'Ì_º€wI§Œ)QE' mac80211_hwsim hwsim18 wlan0: entered promiscuous mode mac80211_hwsim hwsim19 wlan1: entered promiscuous mode ---------------- Code disassembly (best guess): 0: e7 48 out %eax,$0x48 2: c7 03 00 00 00 00 movl $0x0,(%rbx) 8: e8 d9 aa 89 03 callq 0x389aae6 d: 4d 85 f6 test %r14,%r14 10: 75 ba jne 0xffffffcc 12: 49 8d 7c 24 48 lea 0x48(%r12),%rdi 17: e8 3a 8d 89 03 callq 0x3898d56 1c: e8 45 1b 36 00 callq 0x361b66 21: fb sti 22: 65 48 8b 1d b4 f3 65 mov %gs:0x665f3b4(%rip),%rbx # 0x665f3de 29: 06 * 2a: 48 8d bb b8 14 00 00 lea 0x14b8(%rbx),%rdi <-- trapping instruction 31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 38: fc ff df 3b: 48 89 fa mov %rdi,%rdx 3e: 48 rex.W 3f: c1 .byte 0xc1