loop2: detected capacity change from 0 to 64 ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260113 #1 Not tainted ------------------------------------- syz-executor.2/4010 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.2/4010: #0: ffff88800f6263f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801c054698 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800fa4a950 (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: 4010 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_mkdir+0x331/0xb30 vfs_mkdir+0x6d8/0xc00 do_mkdirat+0x11a/0x440 __x64_sys_mkdir+0x65/0x80 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0f43395c27 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:00007f0f4090bfa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f0f43395c27 RDX: 0000000000000004 RSI: 00000000000001ff RDI: 0000000020000100 RBP: 00007f0f4090c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f0f4090c000 R15: 0000000020000240 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.2/4010 Modules linked in: CPU: 1 UID: 0 PID: 4010 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:ffff88806cf08cb8 EFLAGS: 00010086 RAX: 00000000ffffffff RBX: ffff888048a70000 RCX: ffffffff81893b34 RDX: 0000000000000000 RSI: ffffffff81893b4b RDI: ffff888048a703fc RBP: ffff888048a70000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888048a70000 R13: 0000000000000001 R14: ffff88806cf379c0 R15: ffff88806cf37a20 FS: 00007f0f4090c700(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe1a0a9c88 CR3: 000000001dbb4000 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:__sanitizer_cov_trace_pc+0x70/0x80 Code: 82 b8 14 00 00 83 f8 02 75 f0 48 8b 8a c0 14 00 00 8b 92 bc 14 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 d7 48 89 01 48 89 34 c1 4b ef 5b 03 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 RSP: 0018:ffff88804b2b7788 EFLAGS: 00000216 RAX: 000000000002041c RBX: ffffffff86680eb0 RCX: ffffc90002ca0000 RDX: 0000000000040000 RSI: ffffffff84c4fbe9 RDI: 0000000000000006 RBP: ffffffff8152fab8 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff8152fab8 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:ffff88804b2b79e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888048a70000 RCX: ffffc90002ca0000 RDX: 0000000000000000 RSI: ffffffff815664d0 RDI: ffff888048a703fc RBP: ffff888048a70000 R08: 0000000000000000 R09: fffffbfff0ba6ff4 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888048a70000 R13: 0000000000000001 R14: ffffffff85c0e230 R15: ffff88804a836268 __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_mkdir+0x331/0xb30 vfs_mkdir+0x6d8/0xc00 do_mkdirat+0x11a/0x440 __x64_sys_mkdir+0x65/0x80 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0f43395c27 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:00007f0f4090bfa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f0f43395c27 RDX: 0000000000000004 RSI: 00000000000001ff RDI: 0000000020000100 RBP: 00007f0f4090c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f0f4090c000 R15: 0000000020000240 irq event stamp: 431 hardirqs last enabled at (431): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (430): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (426): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (424): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) audit: type=1400 audit(1768328423.567:12): avc: denied { read } for pid=4011 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 9p: Bad value for 'rfdno' 9p: Bad value for 'rfdno' loop7: detected capacity change from 0 to 64 FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) 9pnet_virtio: no channels available for device 127.0.0.1 9p: Bad value for 'rfdno' 9pnet_virtio: no channels available for device 127.0.0.1 9p: Bad value for 'rfdno' loop6: detected capacity change from 0 to 64 FAT-fs (loop6): bogus number of FAT structure FAT-fs (loop6): Can't find a valid FAT filesystem loop6: detected capacity change from 0 to 64 FAT-fs (loop6): bogus number of FAT structure FAT-fs (loop6): Can't find a valid FAT filesystem ---------------- Code disassembly (best guess), 1 bytes skipped: 0: b8 14 00 00 83 mov $0x83000014,%eax 5: f8 clc 6: 02 75 f0 add -0x10(%rbp),%dh 9: 48 8b 8a c0 14 00 00 mov 0x14c0(%rdx),%rcx 10: 8b 92 bc 14 00 00 mov 0x14bc(%rdx),%edx 16: 48 8b 01 mov (%rcx),%rax 19: 48 83 c0 01 add $0x1,%rax 1d: 48 39 c2 cmp %rax,%rdx 20: 76 d7 jbe 0xfffffff9 22: 48 89 01 mov %rax,(%rcx) 25: 48 89 34 c1 mov %rsi,(%rcx,%rax,8) * 29: e9 4b ef 5b 03 jmpq 0x35bef79 <-- trapping instruction 2e: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 35: 00 00 00 00 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop