loop0: detected capacity change from 0 to 131078 ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260114 #1 Not tainted ------------------------------------- syz-executor.5/6314 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.5/6314: #0: ffff88800f86c3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88804a263388 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f7f8950 (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: 6314 Comm: syz-executor.5 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: 0033:0x7f3dfd3d6427 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:00007fffca2c7cc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3dfd3d6427 RDX: 00007fffca2c7da3 RSI: 00007f3dfd431022 RDI: 00007fffca2c7d90 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fffca2c7b60 R10: 00007fffca2c7a17 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007fffca2c7d90 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.5/6314 Modules linked in: CPU: 0 UID: 0 PID: 6314 Comm: syz-executor.5 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:ffff88804a74f9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88800da99b80 RCX: ffffffff81565a27 RDX: 0000000000000000 RSI: ffffffff81565a30 RDI: ffff88800da99f7c RBP: ffff88800da99b80 R08: 0000000000000000 R09: fffffbfff0ba6ffc R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800da99b80 R13: 0000000000000001 R14: ffffffff85c10300 R15: ffff88804a229628 FS: 0000555563267400(0000) GS:ffff8880e5343000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555563267708 CR3: 000000001dcba000 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: 0033:0x7f3dfd3d6427 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:00007fffca2c7cc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3dfd3d6427 RDX: 00007fffca2c7da3 RSI: 00007f3dfd431022 RDI: 00007fffca2c7d90 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fffca2c7b60 R10: 00007fffca2c7a17 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007fffca2c7d90 irq event stamp: 1929 hardirqs last enabled at (1929): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (1927): [] handle_softirqs+0x65e/0x7d0 softirqs last enabled at (1928): [] __irq_exit_rcu+0xc4/0x100 softirqs last disabled at (1553): [] __irq_exit_rcu+0xc4/0x100 ---[ end trace 0000000000000000 ]--- loop5: detected capacity change from 0 to 131078 loop0: detected capacity change from 0 to 131078 loop3: detected capacity change from 0 to 131078 loop6: detected capacity change from 0 to 131078 loop5: detected capacity change from 0 to 264192 FAT-fs (loop5): bogus logical sector size 29440 FAT-fs (loop5): Can't find a valid FAT filesystem loop5: detected capacity change from 0 to 264192 FAT-fs (loop5): bogus logical sector size 29440 FAT-fs (loop5): Can't find a valid FAT filesystem loop6: detected capacity change from 0 to 131078 loop5: detected capacity change from 0 to 131078 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 UID: 0 PID: 6365 Comm: syz-executor.4 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 Call Trace: dump_stack_lvl+0xfa/0x120 should_fail_ex+0x4d7/0x5e0 should_failslab+0xc2/0x120 kmem_cache_alloc_noprof+0x80/0x760 __kernfs_new_node+0xd3/0x940 kernfs_new_node+0x13c/0x1e0 __kernfs_create_file+0x55/0x360 sysfs_add_file_mode_ns+0x21c/0x430 internal_create_group+0x662/0xeb0 internal_create_groups.part.0+0x90/0x140 sysfs_create_groups+0x29/0x50 device_add+0x67e/0x1830 netdev_register_kobject+0x1a9/0x3e0 register_netdevice+0x1320/0x1dc0 __tun_chr_ioctl+0x1f9d/0x4400 __x64_sys_ioctl+0x18f/0x210 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8596b77b19 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:00007f85940ed188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8596c8af60 RCX: 00007f8596b77b19 RDX: 0000000020000040 RSI: 00000000400454ca RDI: 0000000000000004 RBP: 00007f85940ed1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffe0b77299f R14: 00007f85940ed300 R15: 0000000000022000 loop3: detected capacity change from 0 to 131078 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 6370 Comm: syz-executor.2 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 Call Trace: dump_stack_lvl+0xfa/0x120 should_fail_ex+0x4d7/0x5e0 should_failslab+0xc2/0x120 kmem_cache_alloc_noprof+0x80/0x760 __kernfs_new_node+0xd3/0x940 kernfs_new_node+0x13c/0x1e0 __kernfs_create_file+0x55/0x360 sysfs_add_file_mode_ns+0x21c/0x430 internal_create_group+0x662/0xeb0 internal_create_groups.part.0+0x90/0x140 sysfs_create_groups+0x29/0x50 device_add+0x67e/0x1830 netdev_register_kobject+0x1a9/0x3e0 register_netdevice+0x1320/0x1dc0 __tun_chr_ioctl+0x1f9d/0x4400 __x64_sys_ioctl+0x18f/0x210 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd01e1d5b19 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:00007fd01b74b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd01e2e8f60 RCX: 00007fd01e1d5b19 RDX: 0000000020000040 RSI: 00000000400454ca RDI: 0000000000000004 RBP: 00007fd01b74b1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffe19320d6f R14: 00007fd01b74b300 R15: 0000000000022000