Warning: Permanently added '[localhost]:52449' (ECDSA) to the list of known hosts. 2026/01/14 13:15:15 fuzzer started syzkaller login: [ 50.250694] [ 50.250923] ===================================== [ 50.251431] WARNING: bad unlock balance detected! [ 50.251932] 6.19.0-rc5-next-20260114 #1 Not tainted [ 50.252441] ------------------------------------- [ 50.253518] gcc/258 is trying to release lock (rcu_read_lock) at: [ 50.255379] [] __wait_on_freeing_inode+0x105/0x350 [ 50.257123] but there are no more locks to release! [ 50.258858] [ 50.258858] other info that might help us debug this: [ 50.260632] 4 locks held by gcc/258: [ 50.261911] #0: ffff88800a8a03f8 (sb_writers#3){.+.+}-{0:0}, at: path_openat+0x1764/0x2d60 [ 50.263114] #1: ffff888018496330 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: path_openat+0xe32/0x2d60 [ 50.264100] #2: ffff88800a8a4950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe32/0x12d0 [ 50.265035] #3: ffffffff85c16898 (inode_hash_lock){+.+.}-{3:3}, at: insert_inode_locked+0xf9/0x890 [ 50.266005] [ 50.266005] stack backtrace: [ 50.266470] CPU: 0 UID: 0 PID: 258 Comm: gcc Not tainted 6.19.0-rc5-next-20260114 #1 PREEMPT(lazy) [ 50.266488] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 50.266497] Call Trace: [ 50.266503] [ 50.266509] dump_stack_lvl+0xca/0x120 [ 50.266544] ? __wait_on_freeing_inode+0x105/0x350 [ 50.266563] print_unlock_imbalance_bug+0x118/0x130 [ 50.266583] ? __wait_on_freeing_inode+0x105/0x350 [ 50.266602] lock_release+0x1ee/0x270 [ 50.266622] __wait_on_freeing_inode+0x10a/0x350 [ 50.266641] ? __pfx___wait_on_freeing_inode+0x10/0x10 [ 50.266661] ? __pfx_var_wake_function+0x10/0x10 [ 50.266683] ? lock_is_held_type+0x9e/0x120 [ 50.266709] insert_inode_locked+0x25f/0x890 [ 50.266731] __ext4_new_inode+0x223d/0x4cd0 [ 50.266753] ? __pfx___ext4_new_inode+0x10/0x10 [ 50.266772] ? __pfx___dquot_initialize+0x10/0x10 [ 50.266797] ? d_splice_alias_ops+0x14b/0x830 [ 50.266821] ext4_create+0x2e2/0x4e0 [ 50.266844] ? __pfx_ext4_create+0x10/0x10 [ 50.266864] ? security_inode_create+0x75/0xe0 [ 50.266882] ? may_o_create+0x2d0/0x360 [ 50.266901] ? __pfx_ext4_create+0x10/0x10 [ 50.266921] lookup_open.isra.0+0xc03/0x1030 [ 50.266945] ? __pfx_lookup_open.isra.0+0x10/0x10 [ 50.266972] ? __pfx_down_write+0x10/0x10 [ 50.266988] ? mnt_get_write_access+0x7f/0x2c0 [ 50.267009] path_openat+0xea4/0x2d60 [ 50.267028] ? __pfx_path_openat+0x10/0x10 [ 50.267043] ? __lock_acquire+0x451/0x2250 [ 50.267063] do_file_open+0x209/0x460 [ 50.267078] ? __pfx_do_file_open+0x10/0x10 [ 50.267097] ? find_held_lock+0x2b/0x80 [ 50.267109] ? alloc_fd+0x2c1/0x560 [ 50.267123] ? lock_release+0xc8/0x270 [ 50.267142] ? alloc_fd+0x2c1/0x560 [ 50.267158] do_sys_openat2+0xe7/0x210 [ 50.267178] ? __pfx_do_sys_openat2+0x10/0x10 [ 50.267198] ? __up_read+0x26f/0x710 [ 50.267220] __x64_sys_openat+0x142/0x200 [ 50.267239] ? __pfx___x64_sys_openat+0x10/0x10 [ 50.267259] ? irqentry_exit+0xee/0x650 [ 50.267281] ? trace_hardirqs_on_prepare+0xe3/0x110 [ 50.267302] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 50.267321] ? irqentry_exit+0xf3/0x650 [ 50.267344] do_syscall_64+0xbf/0x420 [ 50.267360] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 50.267377] RIP: 0033:0x7f9878faebe7 [ 50.267389] 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 [ 50.267403] RSP: 002b:00007fffdf2a8d50 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 50.267418] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9878faebe7 [ 50.267427] RDX: 00000000000000c2 RSI: 0000000037616e30 RDI: 00000000ffffff9c [ 50.267437] RBP: 0000000037616e30 R08: 0000000000000022 R09: 00007f987908b000 [ 50.267446] R10: 0000000000000180 R11: 0000000000000246 R12: 00000000000000c2 [ 50.267455] R13: 00007f987904dca0 R14: 00007fffdf2a8df0 R15: 8421084210842109 [ 50.267469] [ 50.295397] ------------[ cut here ]------------ [ 50.295885] WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: gcc/258 [ 50.296954] Modules linked in: [ 50.297360] CPU: 0 UID: 0 PID: 258 Comm: gcc Not tainted 6.19.0-rc5-next-20260114 #1 PREEMPT(lazy) [ 50.298347] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 50.299254] RIP: 0010:__rcu_read_unlock+0x25f/0x5c0 [ 50.299869] 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 [ 50.301805] RSP: 0018:ffff88801afaf4f8 EFLAGS: 00010286 [ 50.302425] RAX: 00000000ffffffff RBX: ffff88801b15b700 RCX: ffffffff81565a27 [ 50.303226] RDX: 0000000000000000 RSI: ffffffff81565a30 RDI: ffff88801b15bafc [ 50.303958] RBP: ffff88801b15b700 R08: 0000000000000000 R09: fffffbfff0ba6ffc [ 50.304752] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801b15b700 [ 50.305556] R13: 0000000000000001 R14: ffffffff85c0f8b0 R15: ffff88801b96ebf0 [ 50.306363] FS: 00007f98790865c0(0000) GS:ffff8880e5343000(0000) knlGS:0000000000000000 [ 50.307250] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.307857] CR2: 00007f987908b000 CR3: 000000001eb01000 CR4: 0000000000350ef0 [ 50.308645] Call Trace: [ 50.308962] [ 50.309860] __wait_on_freeing_inode+0x10f/0x350 [ 50.310791] ? __pfx___wait_on_freeing_inode+0x10/0x10 [ 50.312263] ? __pfx_var_wake_function+0x10/0x10 [ 50.313879] ? lock_is_held_type+0x9e/0x120 [ 50.315380] insert_inode_locked+0x25f/0x890 [ 50.317530] __ext4_new_inode+0x223d/0x4cd0 [ 50.320754] ? __pfx___ext4_new_inode+0x10/0x10 [ 50.322377] ? __pfx___dquot_initialize+0x10/0x10 [ 50.324265] ? d_splice_alias_ops+0x14b/0x830 [ 50.325703] ext4_create+0x2e2/0x4e0 [ 50.328072] ? __pfx_ext4_create+0x10/0x10 [ 50.329245] ? security_inode_create+0x75/0xe0 [ 50.330346] ? may_o_create+0x2d0/0x360 [ 50.331136] ? __pfx_ext4_create+0x10/0x10 [ 50.332305] lookup_open.isra.0+0xc03/0x1030 [ 50.334424] ? __pfx_lookup_open.isra.0+0x10/0x10 [ 50.338185] ? __pfx_down_write+0x10/0x10 [ 50.338704] ? mnt_get_write_access+0x7f/0x2c0 [ 50.340785] path_openat+0xea4/0x2d60 [ 50.343954] ? __pfx_path_openat+0x10/0x10 [ 50.345173] ? __lock_acquire+0x451/0x2250 [ 50.347346] do_file_open+0x209/0x460 [ 50.348164] ? __pfx_do_file_open+0x10/0x10 [ 50.350810] ? find_held_lock+0x2b/0x80 [ 50.351597] ? alloc_fd+0x2c1/0x560 [ 50.352350] ? lock_release+0xc8/0x270 [ 50.354134] ? alloc_fd+0x2c1/0x560 [ 50.356586] do_sys_openat2+0xe7/0x210 [ 50.357417] ? __pfx_do_sys_openat2+0x10/0x10 [ 50.358856] ? __up_read+0x26f/0x710 [ 50.360742] __x64_sys_openat+0x142/0x200 [ 50.361594] ? __pfx___x64_sys_openat+0x10/0x10 [ 50.362699] ? irqentry_exit+0xee/0x650 [ 50.363375] ? trace_hardirqs_on_prepare+0xe3/0x110 [ 50.363977] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 50.364768] ? irqentry_exit+0xf3/0x650 [ 50.366449] do_syscall_64+0xbf/0x420 [ 50.367501] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 50.368212] RIP: 0033:0x7f9878faebe7 [ 50.368678] 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 [ 50.370590] RSP: 002b:00007fffdf2a8d50 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 50.371422] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9878faebe7 [ 50.372214] RDX: 00000000000000c2 RSI: 0000000037616e30 RDI: 00000000ffffff9c [ 50.372931] RBP: 0000000037616e30 R08: 0000000000000022 R09: 00007f987908b000 [ 50.373718] R10: 0000000000000180 R11: 0000000000000246 R12: 00000000000000c2 [ 50.374493] R13: 00007f987904dca0 R14: 00007fffdf2a8df0 R15: 8421084210842109 [ 50.377838] [ 50.378143] irq event stamp: 5465 [ 50.378494] hardirqs last enabled at (5465): [] _raw_spin_unlock_irqrestore+0x2c/0x50 [ 50.379589] hardirqs last disabled at (5464): [] _raw_spin_lock_irqsave+0x53/0x60 [ 50.380651] softirqs last enabled at (5460): [] kernel_fpu_end+0x59/0x70 [ 50.381652] softirqs last disabled at (5458): [] kernel_fpu_begin_mask+0x1bb/0x300 [ 50.382717] ---[ end trace 0000000000000000 ]--- 2026/01/14 13:15:15 dialing manager at localhost:46753 [ 50.550846] cgroup: Unknown subsys name 'net' [ 50.592166] cgroup: Unknown subsys name 'cpuset' [ 50.602265] cgroup: Unknown subsys name 'rlimit' 2026/01/14 13:15:25 syscalls: 2214 2026/01/14 13:15:25 code coverage: enabled 2026/01/14 13:15:25 comparison tracing: enabled 2026/01/14 13:15:25 extra coverage: enabled 2026/01/14 13:15:25 setuid sandbox: enabled 2026/01/14 13:15:25 namespace sandbox: enabled 2026/01/14 13:15:25 Android sandbox: enabled 2026/01/14 13:15:25 fault injection: enabled 2026/01/14 13:15:25 leak checking: enabled 2026/01/14 13:15:25 net packet injection: enabled 2026/01/14 13:15:25 net device setup: enabled 2026/01/14 13:15:25 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2026/01/14 13:15:25 devlink PCI setup: PCI device 0000:00:10.0 is not available 2026/01/14 13:15:25 USB emulation: enabled 2026/01/14 13:15:25 hci packet injection: enabled 2026/01/14 13:15:25 wifi device emulation: enabled 2026/01/14 13:15:25 802.15.4 emulation: enabled 2026/01/14 13:15:25 fetching corpus: 50, signal 23624/25444 (executing program) 2026/01/14 13:15:25 fetching corpus: 100, signal 39167/42570 (executing program) 2026/01/14 13:15:25 fetching corpus: 150, signal 48438/53324 (executing program) VM DIAGNOSIS: 13:15:15 Registers: info registers vcpu 0 RAX=000000000000006f RBX=00000000000003f8 RCX=0000000000000000 RDX=00000000000003f8 RSI=ffffffff82973905 RDI=ffffffff889c0960 RBP=ffffffff889c0920 RSP=ffff88801afaf000 R8 =0000000000000000 R9 =ffffed10013ec046 R10=000000000000006f R11=0000000020747562 R12=000000000000006f R13=0000000000000010 R14=ffffffff889c0920 R15=ffffffff829738f0 RIP=ffffffff8297395d 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 00007f98790865c0 00000000 00000000 GS =0000 ffff8880e5343000 00000000 00000000 LDT=0000 fffffe2500000000 00000000 00000000 TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000001000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007f987908b000 CR3=000000001eb01000 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 info registers vcpu 1 RAX=0000000000000001 RBX=0000000000000001 RCX=ffffffff84d172ee RDX=fffffbfff0b82d11 RSI=0000000000000004 RDI=ffffffff85c16880 RBP=ffffffff85c16880 RSP=ffff88801a197b50 R8 =0000000000000000 R9 =fffffbfff0b82d10 R10=ffffffff85c16883 R11=ffffffff81b3c7ea R12=1ffff11003432f6b R13=0000000000000003 R14=fffffbfff0b82d10 R15=ffff88801a197b88 RIP=ffffffff84d17480 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 00007fd15c2f15c0 00000000 00000000 GS =0000 ffff8880e5443000 00000000 00000000 LDT=0000 fffffe4f00000000 00000000 00000000 TR =0040 fffffe000004a000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000048000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007f36ff325000 CR3=000000001eaf3000 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=00000000000000004144962b6ddb459e XMM01=00000000000000003f847ae147ae147b XMM02=00000000000000000000000000000000 XMM03=00000000000000003f793bf757422b67 XMM04=6174736e692065726120737265646165 XMM05=613c206564756c636e69230a64656c6c XMM06=736e65202f2f203e6d687469726f676c XMM07=6568202b2b4320746168742073657275 XMM08=736e6920657261207372656461656820 XMM09=206564756c636e69230a64656c6c6174 XMM10=65202f2f203e6d687469726f676c613c XMM11=202b2b4320746168742073657275736e XMM12=74736e69206572612073726564616568 XMM13=29286e69616d20746e690a64656c6c61 XMM14=6f6c6c6548222866746e697270207b20 XMM15=0a7d203b29226e5c21646c726f57202c