EXT4-fs (loop6): fragment/cluster size (32768) != block size (2048) ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260113 #1 Not tainted ------------------------------------- syz-executor.0/4141 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.0/4141: #0: ffff88801031e3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88804b0ce330 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff8880102fa950 (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: 4141 Comm: syz-executor.0 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_symlink+0x406/0xb40 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: 0033:0x7fc348ece427 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:00007ffdaf1cd2d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc348ece427 RDX: 00007ffdaf1cd3b3 RSI: 00007fc348f2902f RDI: 00007ffdaf1cd3a0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffdaf1cd170 R10: 00007ffdaf1cd027 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffdaf1cd3a0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.0/4141 Modules linked in: CPU: 0 UID: 0 PID: 4141 Comm: syz-executor.0 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:ffff88804c45f9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88804c460000 RCX: ffffffff815664c7 RDX: 0000000000000000 RSI: ffffffff815664d0 RDI: ffff88804c4603fc RBP: ffff88804c460000 R08: 0000000000000000 R09: fffffbfff0ba6ff4 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804c460000 R13: 0000000000000001 R14: ffffffff85c10170 R15: ffff88801b20e268 FS: 000055557845a400(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc348f4e540 CR3: 000000001d746000 CR4: 0000000000350ef0 Call Trace: __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_symlink+0x406/0xb40 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: 0033:0x7fc348ece427 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:00007ffdaf1cd2d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc348ece427 RDX: 00007ffdaf1cd3b3 RSI: 00007fc348f2902f RDI: 00007ffdaf1cd3a0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffdaf1cd170 R10: 00007ffdaf1cd027 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffdaf1cd3a0 irq event stamp: 1313 hardirqs last enabled at (1313): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (1312): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (1308): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (1306): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- netlink: 20 bytes leftover after parsing attributes in process `syz-executor.0'. ieee80211 phy19: Selected rate control algorithm 'minstrel_ht' loop6: detected capacity change from 0 to 4 EXT4-fs (loop6): fragment/cluster size (32768) != block size (2048) netlink: 20 bytes leftover after parsing attributes in process `syz-executor.0'. ieee80211 phy20: Selected rate control algorithm 'minstrel_ht' syz-executor.0 (4146) used greatest stack depth: 24112 bytes left sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 CDB: Service action bidirectional, sa=0x1b 9d 1b fa 35 60 6d 11 77 38 a7 0f b2 94 0a 54 59 loop6: detected capacity change from 0 to 4 netlink: 20 bytes leftover after parsing attributes in process `syz-executor.0'. ieee80211 phy21: Selected rate control algorithm 'minstrel_ht' sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 CDB: Service action bidirectional, sa=0x1b 9d 1b fa 35 60 6d 11 77 38 a7 0f b2 94 0a 54 59 loop6: detected capacity change from 0 to 4 sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 CDB: Service action bidirectional, sa=0x1b 9d 1b fa 35 60 6d 11 77 38 a7 0f b2 94 0a 54 59 loop6: detected capacity change from 0 to 4 loop0: detected capacity change from 0 to 4096 ext4: Unknown parameter 'yD®ž¼‘' loop0: detected capacity change from 0 to 4096 ext4: Unknown parameter 'yD®ž¼‘' loop6: detected capacity change from 0 to 4 sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 CDB: Service action bidirectional, sa=0x1b 9d 1b fa 35 60 6d 11 77 38 a7 0f b2 94 0a 54 59 loop6: detected capacity change from 0 to 4