Warning: Permanently added '[localhost]:7855' (ECDSA) to the list of known hosts. 2026/01/15 16:05:04 fuzzer started syzkaller login: [ 43.580371] [ 43.580687] ===================================== [ 43.581397] WARNING: bad unlock balance detected! [ 43.582100] 6.19.0-rc5-next-20260115 #1 Not tainted [ 43.582824] ------------------------------------- [ 43.587160] gcc/260 is trying to release lock (rcu_read_lock) at: [ 43.588090] [] __wait_on_freeing_inode+0x105/0x350 [ 43.589061] but there are no more locks to release! [ 43.589785] [ 43.589785] other info that might help us debug this: [ 43.590760] 4 locks held by gcc/260: [ 43.591314] #0: ffff88800f94e3f8 (sb_writers#3){.+.+}-{0:0}, at: path_openat+0x1764/0x2d60 [ 43.592595] #1: ffff888016798d68 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: path_openat+0xe32/0x2d60 [ 43.594006] #2: ffff88800f95a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe32/0x12d0 [ 43.595347] #3: ffffffff85c16898 (inode_hash_lock){+.+.}-{3:3}, at: insert_inode_locked+0xf9/0x890 [ 43.596721] [ 43.596721] stack backtrace: [ 43.597387] CPU: 1 UID: 0 PID: 260 Comm: gcc Not tainted 6.19.0-rc5-next-20260115 #1 PREEMPT(lazy) [ 43.597411] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 43.597423] Call Trace: [ 43.597431] [ 43.597438] dump_stack_lvl+0xca/0x120 [ 43.597475] ? __wait_on_freeing_inode+0x105/0x350 [ 43.597501] print_unlock_imbalance_bug+0x118/0x130 [ 43.597527] ? __wait_on_freeing_inode+0x105/0x350 [ 43.597553] lock_release+0x1ee/0x270 [ 43.597579] __wait_on_freeing_inode+0x10a/0x350 [ 43.597606] ? __pfx___wait_on_freeing_inode+0x10/0x10 [ 43.597634] ? __pfx_var_wake_function+0x10/0x10 [ 43.597665] ? lock_is_held_type+0x9e/0x120 [ 43.597686] insert_inode_locked+0x25f/0x890 [ 43.597717] __ext4_new_inode+0x223d/0x4cd0 [ 43.597747] ? __pfx___ext4_new_inode+0x10/0x10 [ 43.597773] ? __pfx___dquot_initialize+0x10/0x10 [ 43.597807] ? d_splice_alias_ops+0x14b/0x830 [ 43.597840] ext4_create+0x2e2/0x4e0 [ 43.597871] ? __pfx_ext4_create+0x10/0x10 [ 43.597900] ? security_inode_create+0x75/0xe0 [ 43.597923] ? may_o_create+0x2d0/0x360 [ 43.597949] ? __pfx_ext4_create+0x10/0x10 [ 43.597978] lookup_open.isra.0+0xc03/0x1030 [ 43.598011] ? __pfx_lookup_open.isra.0+0x10/0x10 [ 43.598048] ? __pfx_down_write+0x10/0x10 [ 43.598070] ? mnt_get_write_access+0x7f/0x2c0 [ 43.598100] path_openat+0xea4/0x2d60 [ 43.598126] ? __pfx_path_openat+0x10/0x10 [ 43.598148] ? __lock_acquire+0x451/0x2250 [ 43.598176] do_file_open+0x209/0x460 [ 43.598197] ? __pfx_do_file_open+0x10/0x10 [ 43.598222] ? find_held_lock+0x2b/0x80 [ 43.598254] ? alloc_fd+0x2c1/0x560 [ 43.598273] ? lock_release+0xc8/0x270 [ 43.598300] ? alloc_fd+0x2c1/0x560 [ 43.598322] do_sys_openat2+0xe7/0x210 [ 43.598349] ? __pfx_do_sys_openat2+0x10/0x10 [ 43.598377] ? __up_read+0x26f/0x710 [ 43.598407] __x64_sys_openat+0x142/0x200 [ 43.598434] ? __pfx___x64_sys_openat+0x10/0x10 [ 43.598462] ? irqentry_exit+0xee/0x650 [ 43.598480] ? trace_hardirqs_on_prepare+0xe3/0x110 [ 43.598508] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 43.598544] ? irqentry_exit+0xf3/0x650 [ 43.598565] do_syscall_64+0xbf/0x420 [ 43.598588] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 43.598609] RIP: 0033:0x7f4ae2027be7 [ 43.598625] 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 [ 43.598645] RSP: 002b:00007ffd479be2d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 43.598664] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4ae2027be7 [ 43.598678] RDX: 00000000000000c2 RSI: 000000000a340e30 RDI: 00000000ffffff9c [ 43.598691] RBP: 000000000a340e30 R08: 0000000000000024 R09: 00007f4ae2104000 [ 43.598704] R10: 0000000000000180 R11: 0000000000000246 R12: 00000000000000c2 [ 43.598716] R13: 00007f4ae20c6ca0 R14: 00007ffd479be370 R15: 8421084210842109 [ 43.598736] [ 43.637872] ------------[ cut here ]------------ [ 43.638648] WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: gcc/260 [ 43.640190] Modules linked in: [ 43.640720] CPU: 1 UID: 0 PID: 260 Comm: gcc Not tainted 6.19.0-rc5-next-20260115 #1 PREEMPT(lazy) [ 43.642156] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 43.643426] RIP: 0010:__rcu_read_unlock+0x25f/0x5c0 [ 43.644365] 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 [ 43.647037] RSP: 0018:ffff888016af74f8 EFLAGS: 00010286 [ 43.647881] RAX: 00000000ffffffff RBX: ffff8880196d3700 RCX: ffffffff815660f7 [ 43.648977] RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff8880196d3afc [ 43.650137] RBP: ffff8880196d3700 R08: 0000000000000000 R09: fffffbfff0ba7040 [ 43.651256] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880196d3700 [ 43.652364] R13: 0000000000000001 R14: ffffffff85c0ed70 R15: ffff888019f8d8e0 [ 43.653473] FS: 00007f4ae20ff5c0(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 [ 43.654725] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.655649] CR2: 00007f4ae2104000 CR3: 000000001e62c000 CR4: 0000000000350ef0 [ 43.656753] Call Trace: [ 43.657285] [ 43.658594] __wait_on_freeing_inode+0x10f/0x350 [ 43.659882] ? __pfx___wait_on_freeing_inode+0x10/0x10 [ 43.661935] ? __pfx_var_wake_function+0x10/0x10 [ 43.664347] ? lock_is_held_type+0x9e/0x120 [ 43.666427] insert_inode_locked+0x25f/0x890 [ 43.669591] __ext4_new_inode+0x223d/0x4cd0 [ 43.674339] ? __pfx___ext4_new_inode+0x10/0x10 [ 43.676674] ? __pfx___dquot_initialize+0x10/0x10 [ 43.679432] ? d_splice_alias_ops+0x14b/0x830 [ 43.681555] ext4_create+0x2e2/0x4e0 [ 43.684883] ? __pfx_ext4_create+0x10/0x10 [ 43.686632] ? security_inode_create+0x75/0xe0 [ 43.688263] ? may_o_create+0x2d0/0x360 [ 43.689382] ? __pfx_ext4_create+0x10/0x10 [ 43.691054] lookup_open.isra.0+0xc03/0x1030 [ 43.694230] ? __pfx_lookup_open.isra.0+0x10/0x10 [ 43.699705] ? __pfx_down_write+0x10/0x10 [ 43.700517] ? mnt_get_write_access+0x7f/0x2c0 [ 43.703573] path_openat+0xea4/0x2d60 [ 43.708249] ? __pfx_path_openat+0x10/0x10 [ 43.709903] ? __lock_acquire+0x451/0x2250 [ 43.713164] do_file_open+0x209/0x460 [ 43.714329] ? __pfx_do_file_open+0x10/0x10 [ 43.718266] ? find_held_lock+0x2b/0x80 [ 43.719420] ? alloc_fd+0x2c1/0x560 [ 43.720493] ? lock_release+0xc8/0x270 [ 43.723031] ? alloc_fd+0x2c1/0x560 [ 43.726708] do_sys_openat2+0xe7/0x210 [ 43.727895] ? __pfx_do_sys_openat2+0x10/0x10 [ 43.730016] ? __up_read+0x26f/0x710 [ 43.732874] __x64_sys_openat+0x142/0x200 [ 43.734170] ? __pfx___x64_sys_openat+0x10/0x10 [ 43.735742] ? irqentry_exit+0xee/0x650 [ 43.736693] ? trace_hardirqs_on_prepare+0xe3/0x110 [ 43.737624] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 43.738764] ? irqentry_exit+0xf3/0x650 [ 43.741221] do_syscall_64+0xbf/0x420 [ 43.742729] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 43.743755] RIP: 0033:0x7f4ae2027be7 [ 43.744502] 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 [ 43.747188] RSP: 002b:00007ffd479be2d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 43.748357] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4ae2027be7 [ 43.749465] RDX: 00000000000000c2 RSI: 000000000a340e30 RDI: 00000000ffffff9c [ 43.750576] RBP: 000000000a340e30 R08: 0000000000000024 R09: 00007f4ae2104000 [ 43.751680] R10: 0000000000000180 R11: 0000000000000246 R12: 00000000000000c2 [ 43.752813] R13: 00007f4ae20c6ca0 R14: 00007ffd479be370 R15: 8421084210842109 [ 43.757792] [ 43.758235] irq event stamp: 3739 [ 43.758747] hardirqs last enabled at (3739): [] _raw_spin_unlock_irqrestore+0x2c/0x50 [ 43.760301] hardirqs last disabled at (3738): [] _raw_spin_lock_irqsave+0x53/0x60 [ 43.761807] softirqs last enabled at (3734): [] kernel_fpu_end+0x59/0x70 [ 43.763290] softirqs last disabled at (3732): [] kernel_fpu_begin_mask+0x1bb/0x300 [ 43.764788] ---[ end trace 0000000000000000 ]--- 2026/01/15 16:05:04 dialing manager at localhost:35245 [ 45.012542] cgroup: Unknown subsys name 'net' [ 45.060429] cgroup: Unknown subsys name 'cpuset' [ 45.071710] cgroup: Unknown subsys name 'rlimit' VM DIAGNOSIS: 16:05:04 Registers: info registers vcpu 0 RAX=0000000000000001 RBX=0000000000000001 RCX=ffffffff84d1a2ce RDX=fffffbfff0b82d11 RSI=0000000000000004 RDI=ffffffff85c16880 RBP=ffffffff85c16880 RSP=ffff88801ad97b40 R8 =0000000000000000 R9 =fffffbfff0b82d10 R10=ffffffff85c16883 R11=ffffffff81b3cf1a R12=1ffff110035b2f69 R13=0000000000000003 R14=fffffbfff0b82d10 R15=ffff88801ad97b78 RIP=ffffffff84d1a460 RFL=00000202 [-------] 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 00007f7dbfb015c0 00000000 00000000 GS =0000 ffff8880e5342000 00000000 00000000 LDT=0000 fffffe7c00000000 00000000 00000000 TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000001000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007f7dbfabf313 CR3=000000000d1d1000 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=3a3a3a3a3a3a3a3a3a3a3a3a3a3a3a3a XMM01=0000000000000000000000ff00000000 XMM02=0000000000000000000000ff00000000 XMM03=00000000000000000000000000000000 XMM04=000000000000000000000000335acd68 XMM05=00007ffcad7ccfd000007ffcad7ccf8e XMM06=00007ffcad7ccf5f00007ffcad7ccf34 XMM07=00000000000000000000000000000000 XMM08=6f6f722f3d445750444c4f006e69622f XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000002000614007 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=0000000000000000000000e40fe2c1fc info registers vcpu 1 RAX=0000000000000038 RBX=00000000000003f8 RCX=0000000000000000 RDX=00000000000003f8 RSI=ffffffff82975135 RDI=ffffffff889c19e0 RBP=ffffffff889c19a0 RSP=ffff888016af7000 R8 =0000000000000000 R9 =ffffed10016d8046 R10=0000000000000038 R11=000000002d2d2d2d R12=0000000000000038 R13=0000000000000010 R14=ffffffff889c19a0 R15=ffffffff82975120 RIP=ffffffff8297518d 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 00007f4ae20ff5c0 00000000 00000000 GS =0000 ffff8880e5442000 00000000 00000000 LDT=0000 fffffe6b00000000 00000000 00000000 TR =0040 fffffe000004a000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000048000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007f4ae2104000 CR3=000000001e62c000 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