Warning: Permanently added '[localhost]:5533' (ECDSA) to the list of known hosts. 2026/01/17 21:28:50 fuzzer started syzkaller login: [ 50.120029] [ 50.120349] ===================================== [ 50.121049] WARNING: bad unlock balance detected! [ 50.121749] 6.19.0-rc5-next-20260116 #1 Not tainted [ 50.122466] ------------------------------------- [ 50.127392] gcc/260 is trying to release lock (rcu_read_lock) at: [ 50.129722] [] __wait_on_freeing_inode+0x105/0x350 [ 50.130670] but there are no more locks to release! [ 50.131385] [ 50.131385] other info that might help us debug this: [ 50.132319] 4 locks held by gcc/260: [ 50.132883] #0: ffff88800f7d03f8 (sb_writers#3){.+.+}-{0:0}, at: path_openat+0x1764/0x2d60 [ 50.134138] #1: ffff888017d5e330 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: path_openat+0xe32/0x2d60 [ 50.135529] #2: ffff88800f7d4950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe32/0x12d0 [ 50.136838] #3: ffffffff85c16898 (inode_hash_lock){+.+.}-{3:3}, at: insert_inode_locked+0xf9/0x890 [ 50.138176] [ 50.138176] stack backtrace: [ 50.138824] CPU: 1 UID: 0 PID: 260 Comm: gcc Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) [ 50.138849] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 50.138862] Call Trace: [ 50.138869] [ 50.138877] dump_stack_lvl+0xca/0x120 [ 50.138919] ? __wait_on_freeing_inode+0x105/0x350 [ 50.138945] print_unlock_imbalance_bug+0x118/0x130 [ 50.138971] ? __wait_on_freeing_inode+0x105/0x350 [ 50.138998] lock_release+0x1ee/0x270 [ 50.139024] __wait_on_freeing_inode+0x10a/0x350 [ 50.139051] ? __pfx___wait_on_freeing_inode+0x10/0x10 [ 50.139079] ? __pfx_var_wake_function+0x10/0x10 [ 50.139110] ? lock_is_held_type+0x9e/0x120 [ 50.139131] insert_inode_locked+0x25f/0x890 [ 50.139161] __ext4_new_inode+0x223d/0x4cd0 [ 50.139192] ? __pfx___ext4_new_inode+0x10/0x10 [ 50.139218] ? __pfx___dquot_initialize+0x10/0x10 [ 50.139252] ? d_splice_alias_ops+0x14b/0x830 [ 50.139285] ext4_create+0x2e2/0x4e0 [ 50.139317] ? __pfx_ext4_create+0x10/0x10 [ 50.139345] ? security_inode_create+0x75/0xe0 [ 50.139368] ? may_o_create+0x2d0/0x360 [ 50.139395] ? __pfx_ext4_create+0x10/0x10 [ 50.139423] lookup_open.isra.0+0xc03/0x1030 [ 50.139456] ? __pfx_lookup_open.isra.0+0x10/0x10 [ 50.139493] ? __pfx_down_write+0x10/0x10 [ 50.139515] ? mnt_get_write_access+0x7f/0x2c0 [ 50.139545] path_openat+0xea4/0x2d60 [ 50.139571] ? __pfx_path_openat+0x10/0x10 [ 50.139593] ? __lock_acquire+0x451/0x2250 [ 50.139621] do_file_open+0x209/0x460 [ 50.139642] ? __pfx_do_file_open+0x10/0x10 [ 50.139667] ? find_held_lock+0x2b/0x80 [ 50.139699] ? alloc_fd+0x2c1/0x560 [ 50.139718] ? lock_release+0xc8/0x270 [ 50.139745] ? alloc_fd+0x2c1/0x560 [ 50.139767] do_sys_openat2+0xe7/0x210 [ 50.139794] ? __pfx_do_sys_openat2+0x10/0x10 [ 50.139822] ? __up_read+0x26f/0x710 [ 50.139852] __x64_sys_openat+0x142/0x200 [ 50.139879] ? __pfx___x64_sys_openat+0x10/0x10 [ 50.139907] ? irqentry_exit+0xee/0x650 [ 50.139925] ? trace_hardirqs_on_prepare+0xe3/0x110 [ 50.139952] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 50.139979] ? irqentry_exit+0xf3/0x650 [ 50.139999] do_syscall_64+0xbf/0x420 [ 50.140022] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 50.140044] RIP: 0033:0x7f26f4a78be7 [ 50.140060] 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 [ 50.140080] RSP: 002b:00007ffd286e9c20 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 50.140099] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f26f4a78be7 [ 50.140113] RDX: 00000000000000c2 RSI: 000000002de56e30 RDI: 00000000ffffff9c [ 50.140126] RBP: 000000002de56e30 R08: 0000000000000022 R09: 00007f26f4b55000 [ 50.140139] R10: 0000000000000180 R11: 0000000000000246 R12: 00000000000000c2 [ 50.140152] R13: 00007f26f4b17ca0 R14: 00007ffd286e9cc0 R15: 8421084210842109 [ 50.140172] [ 50.179305] ------------[ cut here ]------------ [ 50.180151] WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: gcc/260 [ 50.181659] Modules linked in: [ 50.182191] CPU: 1 UID: 0 PID: 260 Comm: gcc Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) [ 50.183622] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 50.184895] RIP: 0010:__rcu_read_unlock+0x25f/0x5c0 [ 50.185818] 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 [ 50.188612] RSP: 0018:ffff88801ad4f4f8 EFLAGS: 00010286 [ 50.189403] RAX: 00000000ffffffff RBX: ffff88801ae4b700 RCX: ffffffff815660f7 [ 50.190571] RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88801ae4bafc [ 50.191700] RBP: ffff88801ae4b700 R08: 0000000000000000 R09: fffffbfff0ba7040 [ 50.192824] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801ae4b700 [ 50.193943] R13: 0000000000000001 R14: ffffffff85c0d510 R15: ffff88801b978ca0 [ 50.195040] FS: 00007f26f4b505c0(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 [ 50.196279] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.197220] CR2: 00007f26f4b55000 CR3: 000000001f1bb000 CR4: 0000000000350ef0 [ 50.198354] Call Trace: [ 50.198869] [ 50.200123] __wait_on_freeing_inode+0x10f/0x350 [ 50.201436] ? __pfx___wait_on_freeing_inode+0x10/0x10 [ 50.203493] ? __pfx_var_wake_function+0x10/0x10 [ 50.205889] ? lock_is_held_type+0x9e/0x120 [ 50.207969] insert_inode_locked+0x25f/0x890 [ 50.211151] __ext4_new_inode+0x223d/0x4cd0 [ 50.215888] ? __pfx___ext4_new_inode+0x10/0x10 [ 50.218196] ? __pfx___dquot_initialize+0x10/0x10 [ 50.220956] ? d_splice_alias_ops+0x14b/0x830 [ 50.223089] ext4_create+0x2e2/0x4e0 [ 50.226429] ? __pfx_ext4_create+0x10/0x10 [ 50.228188] ? security_inode_create+0x75/0xe0 [ 50.229829] ? may_o_create+0x2d0/0x360 [ 50.230951] ? __pfx_ext4_create+0x10/0x10 [ 50.232692] lookup_open.isra.0+0xc03/0x1030 [ 50.235807] ? __pfx_lookup_open.isra.0+0x10/0x10 [ 50.241252] ? __pfx_down_write+0x10/0x10 [ 50.242053] ? mnt_get_write_access+0x7f/0x2c0 [ 50.245119] path_openat+0xea4/0x2d60 [ 50.249785] ? __pfx_path_openat+0x10/0x10 [ 50.251448] ? __lock_acquire+0x451/0x2250 [ 50.254683] do_file_open+0x209/0x460 [ 50.255847] ? __pfx_do_file_open+0x10/0x10 [ 50.259778] ? find_held_lock+0x2b/0x80 [ 50.260958] ? alloc_fd+0x2c1/0x560 [ 50.262035] ? lock_release+0xc8/0x270 [ 50.264644] ? alloc_fd+0x2c1/0x560 [ 50.268231] do_sys_openat2+0xe7/0x210 [ 50.269420] ? __pfx_do_sys_openat2+0x10/0x10 [ 50.271606] ? __up_read+0x26f/0x710 [ 50.274386] __x64_sys_openat+0x142/0x200 [ 50.275658] ? __pfx___x64_sys_openat+0x10/0x10 [ 50.277220] ? irqentry_exit+0xee/0x650 [ 50.278180] ? trace_hardirqs_on_prepare+0xe3/0x110 [ 50.279114] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 50.280243] ? irqentry_exit+0xf3/0x650 [ 50.282687] do_syscall_64+0xbf/0x420 [ 50.284178] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 50.285193] RIP: 0033:0x7f26f4a78be7 [ 50.285933] 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 [ 50.288628] RSP: 002b:00007ffd286e9c20 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 50.289819] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f26f4a78be7 [ 50.290926] RDX: 00000000000000c2 RSI: 000000002de56e30 RDI: 00000000ffffff9c [ 50.292033] RBP: 000000002de56e30 R08: 0000000000000022 R09: 00007f26f4b55000 [ 50.293156] R10: 0000000000000180 R11: 0000000000000246 R12: 00000000000000c2 [ 50.294254] R13: 00007f26f4b17ca0 R14: 00007ffd286e9cc0 R15: 8421084210842109 [ 50.299214] [ 50.299643] irq event stamp: 3153 [ 50.300159] hardirqs last enabled at (3153): [] _raw_spin_unlock_irqrestore+0x2c/0x50 [ 50.301708] hardirqs last disabled at (3152): [] _raw_spin_lock_irqsave+0x53/0x60 [ 50.303216] softirqs last enabled at (3148): [] kernel_fpu_end+0x59/0x70 [ 50.304608] softirqs last disabled at (3146): [] kernel_fpu_begin_mask+0x1bb/0x300 [ 50.306165] ---[ end trace 0000000000000000 ]--- 2026/01/17 21:28:51 dialing manager at localhost:42157 [ 50.527115] cgroup: Unknown subsys name 'net' [ 50.558469] cgroup: Unknown subsys name 'cpuset' [ 50.569803] cgroup: Unknown subsys name 'rlimit' 2026/01/17 21:28:59 syscalls: 2214 2026/01/17 21:28:59 code coverage: enabled 2026/01/17 21:28:59 comparison tracing: enabled 2026/01/17 21:28:59 extra coverage: enabled 2026/01/17 21:28:59 setuid sandbox: enabled 2026/01/17 21:28:59 namespace sandbox: enabled 2026/01/17 21:28:59 Android sandbox: enabled 2026/01/17 21:28:59 fault injection: enabled 2026/01/17 21:28:59 leak checking: enabled 2026/01/17 21:28:59 net packet injection: enabled 2026/01/17 21:28:59 net device setup: enabled 2026/01/17 21:28:59 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2026/01/17 21:28:59 devlink PCI setup: PCI device 0000:00:10.0 is not available 2026/01/17 21:28:59 USB emulation: enabled 2026/01/17 21:28:59 hci packet injection: enabled 2026/01/17 21:28:59 wifi device emulation: enabled 2026/01/17 21:28:59 802.15.4 emulation: enabled 2026/01/17 21:29:00 fetching corpus: 50, signal 29393/31200 (executing program) 2026/01/17 21:29:00 fetching corpus: 100, signal 43904/47388 (executing program) 2026/01/17 21:29:00 fetching corpus: 150, signal 52294/57347 (executing program) 2026/01/17 21:29:00 fetching corpus: 200, signal 58165/64740 (executing program) 2026/01/17 21:29:00 fetching corpus: 250, signal 62186/70271 (executing program) 2026/01/17 21:29:00 fetching corpus: 300, signal 67584/77095 (executing program) 2026/01/17 21:29:00 fetching corpus: 350, signal 70919/81889 (executing program) 2026/01/17 21:29:00 fetching corpus: 400, signal 74379/86731 (executing program) VM DIAGNOSIS: 21:28:51 Registers: info registers vcpu 0 RAX=0000000000000001 RBX=0000000000000001 RCX=ffffffff84d1a2ce RDX=fffffbfff0b82d11 RSI=0000000000000004 RDI=ffffffff85c16880 RBP=ffffffff85c16880 RSP=ffff88800aa67b40 R8 =0000000000000000 R9 =fffffbfff0b82d10 R10=ffffffff85c16883 R11=ffffffff81000130 R12=1ffff1100154cf69 R13=0000000000000003 R14=fffffbfff0b82d10 R15=ffff88800aa67b78 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 00007f71017d45c0 00000000 00000000 GS =0000 ffff8880e5342000 00000000 00000000 LDT=0000 fffffe2f00000000 00000000 00000000 TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000001000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007fed89887c70 CR3=0000000007179000 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=00001fa0 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=00000000000000000000000000000000 XMM01=00000000000000000000000000000000 XMM02=00000000000000004105f84000000000 XMM03=0000ff00000000000000000000000000 XMM04=732f6c61636f6c2f7273752f3d485441 XMM05=622f6c61636f6c2f7273752f3a6e6962 XMM06=73752f3a6e6962732f7273752f3a6e69 XMM07=6e69622f3a6e6962732f3a6e69622f72 XMM08=00000000000000000000000000000000 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=000000000000005b RBX=00000000000003f8 RCX=0000000000000000 RDX=00000000000003f8 RSI=ffffffff82975135 RDI=ffffffff889c19e0 RBP=ffffffff889c19a0 RSP=ffff88801ad4f000 R8 =0000000000000000 R9 =ffffed1001d9b046 R10=000000000000005b R11=203036322f636367 R12=000000000000005b 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 00007f26f4b505c0 00000000 00000000 GS =0000 ffff8880e5442000 00000000 00000000 LDT=0000 fffffe5e00000000 00000000 00000000 TR =0040 fffffe000004a000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000048000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007f26f4b55000 CR3=000000001f1bb000 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