EXT4-fs error (device loop2): __ext4_fill_super:5560: inode #2: comm syz-executor.2: iget: special inode unallocated EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.7/5263 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.7/5263: #0: ffff888009e7e3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff888049e583e0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f93a950 (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: 5263 Comm: syz-executor.7 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: 0033:0x7f30a6907427 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:00007ffe544a8f88 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f30a6907427 RDX: 00007ffe544a9067 RSI: 00007f30a6962019 RDI: 00007ffe544a9050 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe544a8e20 R10: 00007ffe544a8cd7 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffe544a9050 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.7/5263 Modules linked in: CPU: 0 UID: 0 PID: 5263 Comm: syz-executor.7 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:ffff88804af7f9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88801928b700 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88801928bafc RBP: ffff88801928b700 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801928b700 R13: 0000000000000001 R14: ffffffff85c0d9c0 R15: ffff888049c60ca0 FS: 000055556162a400(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f30a6987547 CR3: 000000000da26000 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 filename_symlinkat+0x158/0x440 __x64_sys_symlink+0x82/0x110 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f30a6907427 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:00007ffe544a8f88 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f30a6907427 RDX: 00007ffe544a9067 RSI: 00007f30a6962019 RDI: 00007ffe544a9050 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe544a8e20 R10: 00007ffe544a8cd7 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffe544a9050 irq event stamp: 567 hardirqs last enabled at (567): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (566): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (560): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (558): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop1: detected capacity change from 0 to 512 loop4: detected capacity change from 0 to 512 EXT4-fs error (device loop1): __ext4_fill_super:5560: inode #2: comm syz-executor.1: iget: special inode unallocated EXT4-fs error (device loop4): __ext4_fill_super:5560: inode #2: comm syz-executor.4: iget: special inode unallocated vfat: Unknown parameter 'ÿÿÿÿ' EXT4-fs (loop4): get root inode failed EXT4-fs (loop4): mount failed EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed vfat: Unknown parameter 'obj_user' vfat: Unknown parameter 'obj_user' loop4: detected capacity change from 0 to 512 loop1: detected capacity change from 0 to 512 EXT4-fs error (device loop4): __ext4_fill_super:5560: inode #2: comm syz-executor.4: iget: special inode unallocated EXT4-fs (loop4): get root inode failed EXT4-fs (loop4): mount failed loop2: detected capacity change from 0 to 512 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 1 UID: 0 PID: 5299 Comm: syz-executor.0 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 Call Trace: dump_stack_lvl+0xfa/0x120 should_fail_ex+0x4d7/0x5e0 should_failslab+0xc2/0x120 kmem_cache_alloc_noprof+0x80/0x760 dst_alloc+0x9c/0x650 rt_dst_alloc+0x50/0x3d0 ip_route_output_key_hash_rcu+0x894/0x2370 ip_route_output_key_hash+0x10f/0x2b0 ip_route_output_flow+0x27/0x150 udp_sendmsg+0x1903/0x22c0 inet_sendmsg+0x109/0x150 __sys_sendto+0x4a2/0x570 __x64_sys_sendto+0xe1/0x1c0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fefb67e7b19 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:00007fefb3d5d188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fefb68faf60 RCX: 00007fefb67e7b19 RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007fefb3d5d1d0 R08: 0000000020000080 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe6ee32e6f R14: 00007fefb3d5d300 R15: 0000000000022000 EXT4-fs error (device loop1): __ext4_fill_super:5560: inode #2: comm syz-executor.1: iget: special inode unallocated loop5: detected capacity change from 0 to 512 EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed EXT4-fs error (device loop2): __ext4_fill_super:5560: inode #2: comm syz-executor.2: iget: special inode unallocated EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed EXT4-fs error (device loop5): __ext4_fill_super:5560: inode #2: comm syz-executor.5: iget: special inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed vfat: Unknown parameter 'ÿÿÿÿ' loop1: detected capacity change from 0 to 512 EXT4-fs error (device loop1): __ext4_fill_super:5560: inode #2: comm syz-executor.1: iget: special inode unallocated EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed