loop6: detected capacity change from 0 to 136 ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260113 #1 Not tainted ------------------------------------- syz-executor.6/5587 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.6/5587: #0: ffff88800fa463f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801fa5b388 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800fa52950 (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: 5587 Comm: syz-executor.6 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: 0033:0x7f4412c72c27 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:00007f44101e8fa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f4412c72c27 RDX: 0000000000000003 RSI: 00000000000001ff RDI: 0000000020000140 RBP: 00007f44101e9040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000000 R13: 0000000020000140 R14: 00007f44101e9000 R15: 0000000020012200 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.6/5587 Modules linked in: CPU: 1 UID: 0 PID: 5587 Comm: syz-executor.6 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:ffff88804e0279e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88801a761b80 RCX: ffffc90009ad7000 RDX: 0000000000000000 RSI: ffffffff815664d0 RDI: ffff88801a761f7c RBP: ffff88801a761b80 R08: 0000000000000000 R09: fffffbfff0ba6ff4 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801a761b80 R13: 0000000000000001 R14: ffffffff85c0c200 R15: ffff88801fb3e268 FS: 00007f44101e9700(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055559543cc58 CR3: 000000001e0ff000 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 do_mkdirat+0x11a/0x440 __x64_sys_mkdir+0x65/0x80 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4412c72c27 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:00007f44101e8fa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f4412c72c27 RDX: 0000000000000003 RSI: 00000000000001ff RDI: 0000000020000140 RBP: 00007f44101e9040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000000 R13: 0000000020000140 R14: 00007f44101e9000 R15: 0000000020012200 irq event stamp: 307 hardirqs last enabled at (307): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (306): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (300): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (298): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- ISO 9660 Extensions: Microsoft Joliet Level 3 isofs_fill_super: get root inode failed FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 5610 Comm: syz-executor.1 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_fail_alloc_page+0xe0/0x110 prepare_alloc_pages+0x1eb/0x550 __alloc_frozen_pages_noprof+0x185/0x2070 alloc_pages_mpol+0xed/0x340 alloc_pages_noprof+0xa1/0x380 __pmd_alloc+0x3b/0xad0 __handle_mm_fault+0xcf2/0x2f50 handle_mm_fault+0x2d8/0x750 do_user_addr_fault+0x3cc/0x12b0 exc_page_fault+0xb0/0x180 asm_exc_page_fault+0x26/0x30 RIP: 0010:__put_user_4+0xd/0x20 Code: 66 89 01 31 c9 0f 01 ca e9 90 70 03 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca e9 67 70 03 00 0f 1f 80 00 00 00 00 90 90 90 RSP: 0018:ffff88804cfefb48 EFLAGS: 00050202 RAX: 0000000000000044 RBX: 0000000000000000 RCX: 0000000020000080 RDX: 0000000000040000 RSI: ffffffff82927760 RDI: 0000000000000000 RBP: 0000000020000080 R08: ffffffff819ef530 R09: 0000000000000001 R10: ffffffff85d2bd20 R11: 0000000000000000 R12: 0000000000000044 R13: ffffffff8614d9f0 R14: dffffc0000000000 R15: 0000000000000044 vt_do_diacrit+0x5bb/0xc10 vt_ioctl+0xb93/0x2e60 tty_ioctl+0x78b/0x17f0 __x64_sys_ioctl+0x18f/0x210 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f32e6964b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f32e3eda188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f32e6a77f60 RCX: 00007f32e6964b19 RDX: 0000000020000080 RSI: 0000000000004b4a RDI: 0000000000000003 RBP: 00007f32e3eda1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc6d6fc44f R14: 00007f32e3eda300 R15: 0000000000022000 loop6: detected capacity change from 0 to 136 loop4: detected capacity change from 0 to 240 ISO 9660 Extensions: Microsoft Joliet Level 3 isofs_fill_super: get root inode failed netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. loop6: detected capacity change from 0 to 240 isofs_fill_super: bread failed, dev=loop4, iso_blknum=60, block=120 ISO 9660 Extensions: Microsoft Joliet Level 3 isofs_fill_super: get root inode failed UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 Bluetooth: hci3: SCO packet for unknown connection handle 200 Bluetooth: hci3: SCO packet for unknown connection handle 200 Bluetooth: hci3: SCO packet for unknown connection handle 200 Bluetooth: hci3: SCO packet for unknown connection handle 200 Bluetooth: hci3: SCO packet for unknown connection handle 200 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 ---------------- Code disassembly (best guess): 0: 66 89 01 mov %ax,(%rcx) 3: 31 c9 xor %ecx,%ecx 5: 0f 01 ca clac 8: e9 90 70 03 00 jmpq 0x3709d d: 90 nop e: 90 nop f: 90 nop 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: 48 89 cb mov %rcx,%rbx 20: 48 c1 fb 3f sar $0x3f,%rbx 24: 48 09 d9 or %rbx,%rcx 27: 0f 01 cb stac * 2a: 89 01 mov %eax,(%rcx) <-- trapping instruction 2c: 31 c9 xor %ecx,%ecx 2e: 0f 01 ca clac 31: e9 67 70 03 00 jmpq 0x3709d 36: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 3d: 90 nop 3e: 90 nop 3f: 90 nop