Warning: Permanently added '[localhost]:47889' (ECDSA) to the list of known hosts. 2026/01/14 09:09:01 fuzzer started syzkaller login: [ 50.236972] [ 50.237280] ===================================== [ 50.237972] WARNING: bad unlock balance detected! [ 50.238650] 6.19.0-rc5-next-20260114 #1 Not tainted [ 50.239353] ------------------------------------- [ 50.240052] gcc/259 is trying to release lock (rcu_read_lock) at: [ 50.246950] [] __wait_on_freeing_inode+0x105/0x350 [ 50.247887] but there are no more locks to release! [ 50.248605] [ 50.248605] other info that might help us debug this: [ 50.249534] 4 locks held by gcc/259: [ 50.250066] #0: ffff88800f6b83f8 (sb_writers#3){.+.+}-{0:0}, at: path_openat+0x1764/0x2d60 [ 50.251294] #1: ffff888017c88d68 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: path_openat+0xe32/0x2d60 [ 50.252664] #2: ffff88800f6bc950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe32/0x12d0 [ 50.253955] #3: ffffffff85c16898 (inode_hash_lock){+.+.}-{3:3}, at: insert_inode_locked+0xf9/0x890 [ 50.255322] [ 50.255322] stack backtrace: [ 50.255981] CPU: 1 UID: 0 PID: 259 Comm: gcc Not tainted 6.19.0-rc5-next-20260114 #1 PREEMPT(lazy) [ 50.256016] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 50.256029] Call Trace: [ 50.256036] [ 50.256043] dump_stack_lvl+0xca/0x120 [ 50.256077] ? __wait_on_freeing_inode+0x105/0x350 [ 50.256103] print_unlock_imbalance_bug+0x118/0x130 [ 50.256130] ? __wait_on_freeing_inode+0x105/0x350 [ 50.256156] lock_release+0x1ee/0x270 [ 50.256183] __wait_on_freeing_inode+0x10a/0x350 [ 50.256210] ? __pfx___wait_on_freeing_inode+0x10/0x10 [ 50.256238] ? __pfx_var_wake_function+0x10/0x10 [ 50.256269] ? lock_is_held_type+0x9e/0x120 [ 50.256304] insert_inode_locked+0x25f/0x890 [ 50.256335] __ext4_new_inode+0x223d/0x4cd0 [ 50.256365] ? __pfx___ext4_new_inode+0x10/0x10 [ 50.256391] ? __pfx___dquot_initialize+0x10/0x10 [ 50.256426] ? d_splice_alias_ops+0x14b/0x830 [ 50.256459] ext4_create+0x2e2/0x4e0 [ 50.256490] ? __pfx_ext4_create+0x10/0x10 [ 50.256519] ? security_inode_create+0x75/0xe0 [ 50.256543] ? may_o_create+0x2d0/0x360 [ 50.256569] ? __pfx_ext4_create+0x10/0x10 [ 50.256598] lookup_open.isra.0+0xc03/0x1030 [ 50.256633] ? __pfx_lookup_open.isra.0+0x10/0x10 [ 50.256673] ? __pfx_down_write+0x10/0x10 [ 50.256694] ? mnt_get_write_access+0x7f/0x2c0 [ 50.256724] path_openat+0xea4/0x2d60 [ 50.256750] ? __pfx_path_openat+0x10/0x10 [ 50.256772] ? __lock_acquire+0x451/0x2250 [ 50.256801] do_file_open+0x209/0x460 [ 50.256822] ? __pfx_do_file_open+0x10/0x10 [ 50.256848] ? find_held_lock+0x2b/0x80 [ 50.256865] ? alloc_fd+0x2c1/0x560 [ 50.256884] ? lock_release+0xc8/0x270 [ 50.256911] ? alloc_fd+0x2c1/0x560 [ 50.256934] do_sys_openat2+0xe7/0x210 [ 50.256961] ? __pfx_do_sys_openat2+0x10/0x10 [ 50.256989] ? __up_read+0x26f/0x710 [ 50.257020] __x64_sys_openat+0x142/0x200 [ 50.257047] ? __pfx___x64_sys_openat+0x10/0x10 [ 50.257075] ? irqentry_exit+0xee/0x650 [ 50.257106] ? trace_hardirqs_on_prepare+0xe3/0x110 [ 50.257134] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 50.257161] ? irqentry_exit+0xf3/0x650 [ 50.257195] do_syscall_64+0xbf/0x420 [ 50.257217] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 50.257238] RIP: 0033:0x7fc2a2e9ebe7 [ 50.257254] Code: 25 00 00 41 00 3d 00 00 41 00 74 47 64 8b 04 25 18 00 00 00 85 c0 75 6b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 95 00 00 00 48 8b 4c 24 28 64 48 2b 0c 25 [ 50.257274] RSP: 002b:00007ffc6c95b440 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 50.257294] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc2a2e9ebe7 [ 50.257307] RDX: 00000000000000c2 RSI: 000000002b567e30 RDI: 00000000ffffff9c [ 50.257320] RBP: 000000002b567e30 R08: 0000000000000006 R09: 00007fc2a2f7b000 [ 50.257333] R10: 0000000000000180 R11: 0000000000000246 R12: 00000000000000c2 [ 50.257346] R13: 00007fc2a2f3dca0 R14: 00007ffc6c95b4e0 R15: 8421084210842109 [ 50.257366] [ 50.296626] ------------[ cut here ]------------ [ 50.297300] WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: gcc/259 [ 50.298860] Modules linked in: [ 50.299394] CPU: 1 UID: 0 PID: 259 Comm: gcc Not tainted 6.19.0-rc5-next-20260114 #1 PREEMPT(lazy) [ 50.300761] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 50.302013] RIP: 0010:__rcu_read_unlock+0x25f/0x5c0 [ 50.302940] 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 [ 50.305631] RSP: 0018:ffff88801acbf4f8 EFLAGS: 00010286 [ 50.306397] RAX: 00000000ffffffff RBX: ffff888019495280 RCX: ffffffff81565a27 [ 50.307559] RDX: 0000000000000000 RSI: ffffffff81565a30 RDI: ffff88801949567c [ 50.308666] RBP: ffff888019495280 R08: 0000000000000000 R09: fffffbfff0ba6ffc [ 50.309764] R10: 0000000000000000 R11: 0000000000000001 R12: ffff888019495280 [ 50.310861] R13: 0000000000000001 R14: ffffffff85c103a0 R15: ffff88801b1745d0 [ 50.311961] FS: 00007fc2a2f765c0(0000) GS:ffff8880e5443000(0000) knlGS:0000000000000000 [ 50.313197] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.314115] CR2: 00007fc2a2f7b000 CR3: 000000001efab000 CR4: 0000000000350ef0 [ 50.315222] Call Trace: [ 50.315739] [ 50.317035] __wait_on_freeing_inode+0x10f/0x350 [ 50.318313] ? __pfx___wait_on_freeing_inode+0x10/0x10 [ 50.320382] ? __pfx_var_wake_function+0x10/0x10 [ 50.322793] ? lock_is_held_type+0x9e/0x120 [ 50.324893] insert_inode_locked+0x25f/0x890 [ 50.328043] __ext4_new_inode+0x223d/0x4cd0 [ 50.332780] ? __pfx___ext4_new_inode+0x10/0x10 [ 50.335090] ? __pfx___dquot_initialize+0x10/0x10 [ 50.337863] ? d_splice_alias_ops+0x14b/0x830 [ 50.340000] ext4_create+0x2e2/0x4e0 [ 50.343328] ? __pfx_ext4_create+0x10/0x10 [ 50.345067] ? security_inode_create+0x75/0xe0 [ 50.346671] ? may_o_create+0x2d0/0x360 [ 50.347792] ? __pfx_ext4_create+0x10/0x10 [ 50.349536] lookup_open.isra.0+0xc03/0x1030 [ 50.352611] ? __pfx_lookup_open.isra.0+0x10/0x10 [ 50.358036] ? __pfx_down_write+0x10/0x10 [ 50.358844] ? mnt_get_write_access+0x7f/0x2c0 [ 50.361905] path_openat+0xea4/0x2d60 [ 50.366543] ? __pfx_path_openat+0x10/0x10 [ 50.368205] ? __lock_acquire+0x451/0x2250 [ 50.371356] do_file_open+0x209/0x460 [ 50.372581] ? __pfx_do_file_open+0x10/0x10 [ 50.376414] ? find_held_lock+0x2b/0x80 [ 50.377598] ? alloc_fd+0x2c1/0x560 [ 50.378660] ? lock_release+0xc8/0x270 [ 50.381190] ? alloc_fd+0x2c1/0x560 [ 50.384848] do_sys_openat2+0xe7/0x210 [ 50.386016] ? __pfx_do_sys_openat2+0x10/0x10 [ 50.388129] ? __up_read+0x26f/0x710 [ 50.390945] __x64_sys_openat+0x142/0x200 [ 50.392152] ? __pfx___x64_sys_openat+0x10/0x10 [ 50.393772] ? irqentry_exit+0xee/0x650 [ 50.394725] ? trace_hardirqs_on_prepare+0xe3/0x110 [ 50.395647] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 50.396768] ? irqentry_exit+0xf3/0x650 [ 50.399144] do_syscall_64+0xbf/0x420 [ 50.400715] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 50.401712] RIP: 0033:0x7fc2a2e9ebe7 [ 50.402369] Code: 25 00 00 41 00 3d 00 00 41 00 74 47 64 8b 04 25 18 00 00 00 85 c0 75 6b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 95 00 00 00 48 8b 4c 24 28 64 48 2b 0c 25 [ 50.405042] RSP: 002b:00007ffc6c95b440 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 50.406206] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc2a2e9ebe7 [ 50.407308] RDX: 00000000000000c2 RSI: 000000002b567e30 RDI: 00000000ffffff9c [ 50.408424] RBP: 000000002b567e30 R08: 0000000000000006 R09: 00007fc2a2f7b000 [ 50.409592] R10: 0000000000000180 R11: 0000000000000246 R12: 00000000000000c2 [ 50.410683] R13: 00007fc2a2f3dca0 R14: 00007ffc6c95b4e0 R15: 8421084210842109 [ 50.415616] [ 50.415972] irq event stamp: 3053 [ 50.416553] hardirqs last enabled at (3053): [] _raw_spin_unlock_irqrestore+0x2c/0x50 [ 50.418091] hardirqs last disabled at (3052): [] _raw_spin_lock_irqsave+0x53/0x60 [ 50.419572] softirqs last enabled at (3048): [] kernel_fpu_end+0x59/0x70 [ 50.420964] softirqs last disabled at (3046): [] kernel_fpu_begin_mask+0x1bb/0x300 [ 50.422532] ---[ end trace 0000000000000000 ]--- 2026/01/14 09:09:02 dialing manager at localhost:46753 [ 50.638957] cgroup: Unknown subsys name 'net' [ 50.691319] cgroup: Unknown subsys name 'cpuset' [ 50.702175] cgroup: Unknown subsys name 'rlimit' 2026/01/14 09:09:11 syscalls: 2214 2026/01/14 09:09:11 code coverage: enabled 2026/01/14 09:09:11 comparison tracing: enabled 2026/01/14 09:09:11 extra coverage: enabled 2026/01/14 09:09:11 setuid sandbox: enabled 2026/01/14 09:09:11 namespace sandbox: enabled 2026/01/14 09:09:11 Android sandbox: enabled 2026/01/14 09:09:11 fault injection: enabled 2026/01/14 09:09:11 leak checking: enabled 2026/01/14 09:09:11 net packet injection: enabled 2026/01/14 09:09:11 net device setup: enabled 2026/01/14 09:09:11 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2026/01/14 09:09:11 devlink PCI setup: PCI device 0000:00:10.0 is not available 2026/01/14 09:09:11 USB emulation: enabled 2026/01/14 09:09:11 hci packet injection: enabled 2026/01/14 09:09:11 wifi device emulation: enabled 2026/01/14 09:09:11 802.15.4 emulation: enabled 2026/01/14 09:09:11 fetching corpus: 0, signal 0/2000 (executing program) 2026/01/14 09:09:11 fetching corpus: 50, signal 28529/31984 (executing program) 2026/01/14 09:09:11 fetching corpus: 100, signal 40132/45011 (executing program) 2026/01/14 09:09:11 fetching corpus: 150, signal 48229/54442 (executing program) 2026/01/14 09:09:11 fetching corpus: 200, signal 53814/61293 (executing program) VM DIAGNOSIS: 09:09:01 Registers: info registers vcpu 0 RAX=fffffbfff0ccdc67 RBX=0000000000000000 RCX=ffffffff814be87b RDX=0000000000000000 RSI=0000000000000008 RDI=ffffffff8666e338 RBP=fffffbfff0ccdc67 RSP=ffff88806ce08cc0 R8 =0000000000000000 R9 =fffffbfff0ccdc67 R10=ffffffff8666e33f R11=0000000000000000 R12=ffff88806ce274c0 R13=ffff88806ce38528 R14=ffff88806ce384d0 R15=ffff88806ce379c0 RIP=ffffffff81b3c22a RFL=00000082 [--S----] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 00007fded60585c0 00000000 00000000 GS =0000 ffff8880e5343000 00000000 00000000 LDT=0000 fffffe5100000000 00000000 00000000 TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000001000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007fded5efbc70 CR3=000000001f56a000 CR4=00350ef0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 XMM00=00000000a60ce07b00000000cec3662e XMM01=000000000000000003515b82db34ca11 XMM02=0000000000000000333bebdfd0a6a21d XMM03=505f434c00534547415353454d5f434c XMM04=000000000000000000000000336e0d68 XMM05=00007fff98763fd000007fff98763f8e XMM06=00007fff98763f5f00007fff98763f34 XMM07=00000000000000000000000000000000 XMM08=6d726574206e6f6974616c69706d6f63 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=0000000000000000000000e40fe2c1fc info registers vcpu 1 RAX=dffffc0000000060 RBX=00000000000003fd RCX=0000000000000000 RDX=00000000000003fd RSI=ffffffff82973870 RDI=ffffffff889c0960 RBP=ffffffff889c0920 RSP=ffff88801acbef68 R8 =0000000000000000 R9 =ffffed1001460046 R10=00000000000fe503 R11=203935322f636367 R12=0000000000000823 R13=0000000000000060 R14=fffffbfff113817e R15=dffffc0000000000 RIP=ffffffff829738c5 RFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 00007fc2a2f765c0 00000000 00000000 GS =0000 ffff8880e5443000 00000000 00000000 LDT=0000 fffffe4300000000 00000000 00000000 TR =0040 fffffe000004a000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000048000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007fc2a2f7b000 CR3=000000001efab000 CR4=00350ef0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 XMM00=00000000a60ce07b00000000cec3662e XMM01=000000000000000003515b82db34ca11 XMM02=0000000000000000333bebdfd0a6a21d XMM03=0000000000000000000000000000732e XMM04=7b253a32336d7b250000000000007d7d XMM05=504152575f4f544c5f5443454c4c4f43 XMM06=3a253a32336d61250000000000007570 XMM07=00000000000000000000000000000000 XMM08=313d544c55414645445f544547524154 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000002000614007 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=0000000000000000000000e40fe2c1fc