Warning: Permanently added '[localhost]:60288' (ECDSA) to the list of known hosts. 2026/01/16 16:06:57 fuzzer started syzkaller login: [ 58.379586] [ 58.379858] ===================================== [ 58.380459] WARNING: bad unlock balance detected! [ 58.381095] 6.19.0-rc5-next-20260116 #1 Not tainted [ 58.381718] ------------------------------------- [ 58.382978] gcc/263 is trying to release lock (rcu_read_lock) at: [ 58.384835] [] __wait_on_freeing_inode+0x105/0x350 [ 58.386110] but there are no more locks to release! [ 58.387052] [ 58.387052] other info that might help us debug this: [ 58.388582] 4 locks held by gcc/263: [ 58.389825] #0: ffff88800fc3a3f8 (sb_writers#3){.+.+}-{0:0}, at: path_openat+0x1764/0x2d60 [ 58.391371] #1: ffff888018043d10 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: path_openat+0xe32/0x2d60 [ 58.393114] #2: ffff88800fc3e950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe32/0x12d0 [ 58.394694] #3: ffffffff85c16898 (inode_hash_lock){+.+.}-{3:3}, at: insert_inode_locked+0xf9/0x890 [ 58.396327] [ 58.396327] stack backtrace: [ 58.397302] CPU: 0 UID: 0 PID: 263 Comm: gcc Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) [ 58.397324] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 58.397334] Call Trace: [ 58.397341] [ 58.397347] dump_stack_lvl+0xca/0x120 [ 58.397386] ? __wait_on_freeing_inode+0x105/0x350 [ 58.397408] print_unlock_imbalance_bug+0x118/0x130 [ 58.397430] ? __wait_on_freeing_inode+0x105/0x350 [ 58.397452] lock_release+0x1ee/0x270 [ 58.397474] __wait_on_freeing_inode+0x10a/0x350 [ 58.397496] ? __pfx___wait_on_freeing_inode+0x10/0x10 [ 58.397519] ? __pfx_var_wake_function+0x10/0x10 [ 58.397545] ? lock_is_held_type+0x9e/0x120 [ 58.397563] insert_inode_locked+0x25f/0x890 [ 58.397589] __ext4_new_inode+0x223d/0x4cd0 [ 58.397614] ? __pfx___ext4_new_inode+0x10/0x10 [ 58.397636] ? __pfx___dquot_initialize+0x10/0x10 [ 58.397664] ? d_splice_alias_ops+0x14b/0x830 [ 58.397692] ext4_create+0x2e2/0x4e0 [ 58.397718] ? __pfx_ext4_create+0x10/0x10 [ 58.397742] ? security_inode_create+0x75/0xe0 [ 58.397761] ? may_o_create+0x2d0/0x360 [ 58.397783] ? __pfx_ext4_create+0x10/0x10 [ 58.397807] lookup_open.isra.0+0xc03/0x1030 [ 58.397835] ? __pfx_lookup_open.isra.0+0x10/0x10 [ 58.397866] ? __pfx_down_write+0x10/0x10 [ 58.397884] ? mnt_get_write_access+0x7f/0x2c0 [ 58.397909] path_openat+0xea4/0x2d60 [ 58.397931] ? __pfx_path_openat+0x10/0x10 [ 58.397949] ? __lock_acquire+0x451/0x2250 [ 58.397972] do_file_open+0x209/0x460 [ 58.397990] ? __pfx_do_file_open+0x10/0x10 [ 58.398011] ? find_held_lock+0x2b/0x80 [ 58.398037] ? alloc_fd+0x2c1/0x560 [ 58.398053] ? lock_release+0xc8/0x270 [ 58.398075] ? alloc_fd+0x2c1/0x560 [ 58.398094] do_sys_openat2+0xe7/0x210 [ 58.398116] ? __pfx_do_sys_openat2+0x10/0x10 [ 58.398139] ? __up_read+0x26f/0x710 [ 58.398164] __x64_sys_openat+0x142/0x200 [ 58.398187] ? __pfx___x64_sys_openat+0x10/0x10 [ 58.398211] ? irqentry_exit+0xee/0x650 [ 58.398225] ? trace_hardirqs_on_prepare+0xe3/0x110 [ 58.398248] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 58.398270] ? irqentry_exit+0xf3/0x650 [ 58.398287] do_syscall_64+0xbf/0x420 [ 58.398306] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 58.398325] RIP: 0033:0x7f4f0db05be7 [ 58.398338] 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 [ 58.398354] RSP: 002b:00007ffe85369980 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 58.398371] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4f0db05be7 [ 58.398382] RDX: 00000000000000c2 RSI: 000000003e7f6e30 RDI: 00000000ffffff9c [ 58.398393] RBP: 000000003e7f6e30 R08: 0000000000000001 R09: 00007f4f0dbe2000 [ 58.398404] R10: 0000000000000180 R11: 0000000000000246 R12: 00000000000000c2 [ 58.398414] R13: 00007f4f0dba4ca0 R14: 00007ffe85369a20 R15: 8421084210842109 [ 58.398431] [ 58.429965] ------------[ cut here ]------------ [ 58.430573] WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: gcc/263 [ 58.431768] Modules linked in: [ 58.432189] CPU: 0 UID: 0 PID: 263 Comm: gcc Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) [ 58.433275] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 58.434267] RIP: 0010:__rcu_read_unlock+0x25f/0x5c0 [ 58.435012] 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 [ 58.437131] RSP: 0018:ffff8880194474f8 EFLAGS: 00010286 [ 58.437800] RAX: 00000000ffffffff RBX: ffff888016acd280 RCX: ffffffff815660f7 [ 58.438671] RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff888016acd67c [ 58.439570] RBP: ffff888016acd280 R08: 0000000000000000 R09: fffffbfff0ba7040 [ 58.440502] R10: 0000000000000000 R11: 0000000000000001 R12: ffff888016acd280 [ 58.441362] R13: 0000000000000001 R14: ffffffff85c0f9a0 R15: ffff88801c4d9fb0 [ 58.442286] FS: 00007f4f0dbdd5c0(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 [ 58.443304] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 58.444070] CR2: 00007f4f0dbe2000 CR3: 000000001f2b8000 CR4: 0000000000350ef0 [ 58.445001] Call Trace: [ 58.445362] [ 58.446464] __wait_on_freeing_inode+0x10f/0x350 [ 58.447528] ? __pfx___wait_on_freeing_inode+0x10/0x10 [ 58.449168] ? __pfx_var_wake_function+0x10/0x10 [ 58.451095] ? lock_is_held_type+0x9e/0x120 [ 58.452828] insert_inode_locked+0x25f/0x890 [ 58.455320] __ext4_new_inode+0x223d/0x4cd0 [ 58.459201] ? __pfx___ext4_new_inode+0x10/0x10 [ 58.461173] ? __pfx___dquot_initialize+0x10/0x10 [ 58.463391] ? d_splice_alias_ops+0x14b/0x830 [ 58.465165] ext4_create+0x2e2/0x4e0 [ 58.467910] ? __pfx_ext4_create+0x10/0x10 [ 58.469290] ? security_inode_create+0x75/0xe0 [ 58.470615] ? may_o_create+0x2d0/0x360 [ 58.471551] ? __pfx_ext4_create+0x10/0x10 [ 58.472955] lookup_open.isra.0+0xc03/0x1030 [ 58.475509] ? __pfx_lookup_open.isra.0+0x10/0x10 [ 58.479912] ? __pfx_down_write+0x10/0x10 [ 58.480591] ? mnt_get_write_access+0x7f/0x2c0 [ 58.483063] path_openat+0xea4/0x2d60 [ 58.486841] ? __pfx_path_openat+0x10/0x10 [ 58.488212] ? __lock_acquire+0x451/0x2250 [ 58.490820] do_file_open+0x209/0x460 [ 58.491839] ? __pfx_do_file_open+0x10/0x10 [ 58.495005] ? find_held_lock+0x2b/0x80 [ 58.495951] ? alloc_fd+0x2c1/0x560 [ 58.496847] ? lock_release+0xc8/0x270 [ 58.498952] ? alloc_fd+0x2c1/0x560 [ 58.501903] do_sys_openat2+0xe7/0x210 [ 58.502878] ? __pfx_do_sys_openat2+0x10/0x10 [ 58.504610] ? __up_read+0x26f/0x710 [ 58.506773] __x64_sys_openat+0x142/0x200 [ 58.507768] ? __pfx___x64_sys_openat+0x10/0x10 [ 58.509045] ? irqentry_exit+0xee/0x650 [ 58.509822] ? trace_hardirqs_on_prepare+0xe3/0x110 [ 58.510588] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 58.511509] ? irqentry_exit+0xf3/0x650 [ 58.513391] do_syscall_64+0xbf/0x420 [ 58.514701] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 58.515519] RIP: 0033:0x7f4f0db05be7 [ 58.516059] 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 [ 58.518232] RSP: 002b:00007ffe85369980 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 58.519149] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4f0db05be7 [ 58.520013] RDX: 00000000000000c2 RSI: 000000003e7f6e30 RDI: 00000000ffffff9c [ 58.520892] RBP: 000000003e7f6e30 R08: 0000000000000001 R09: 00007f4f0dbe2000 [ 58.521749] R10: 0000000000000180 R11: 0000000000000246 R12: 00000000000000c2 [ 58.522608] R13: 00007f4f0dba4ca0 R14: 00007ffe85369a20 R15: 8421084210842109 [ 58.526545] [ 58.526825] irq event stamp: 3301 [ 58.527215] hardirqs last enabled at (3301): [] _raw_spin_unlock_irqrestore+0x2c/0x50 [ 58.528471] hardirqs last disabled at (3300): [] _raw_spin_lock_irqsave+0x53/0x60 [ 58.529656] softirqs last enabled at (3296): [] kernel_fpu_end+0x59/0x70 [ 58.530754] softirqs last disabled at (3294): [] kernel_fpu_begin_mask+0x1bb/0x300 [ 58.531926] ---[ end trace 0000000000000000 ]--- 2026/01/16 16:06:58 dialing manager at localhost:42157 [ 58.706783] cgroup: Unknown subsys name 'net' [ 58.744675] cgroup: Unknown subsys name 'cpuset' [ 58.761097] cgroup: Unknown subsys name 'rlimit' 2026/01/16 16:07:07 syscalls: 2214 2026/01/16 16:07:07 code coverage: enabled 2026/01/16 16:07:07 comparison tracing: enabled 2026/01/16 16:07:07 extra coverage: enabled 2026/01/16 16:07:07 setuid sandbox: enabled 2026/01/16 16:07:07 namespace sandbox: enabled 2026/01/16 16:07:07 Android sandbox: enabled 2026/01/16 16:07:07 fault injection: enabled 2026/01/16 16:07:07 leak checking: enabled 2026/01/16 16:07:07 net packet injection: enabled 2026/01/16 16:07:07 net device setup: enabled 2026/01/16 16:07:07 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2026/01/16 16:07:07 devlink PCI setup: PCI device 0000:00:10.0 is not available 2026/01/16 16:07:07 USB emulation: enabled 2026/01/16 16:07:07 hci packet injection: enabled 2026/01/16 16:07:07 wifi device emulation: enabled 2026/01/16 16:07:07 802.15.4 emulation: enabled 2026/01/16 16:07:07 fetching corpus: 50, signal 25716/27497 (executing program) 2026/01/16 16:07:07 fetching corpus: 100, signal 36582/39962 (executing program) 2026/01/16 16:07:08 fetching corpus: 150, signal 47466/52281 (executing program) VM DIAGNOSIS: 16:06:58 Registers: info registers vcpu 0 RAX=dffffc0000000005 RBX=00000000000003f9 RCX=0000000000000000 RDX=00000000000003f9 RSI=ffffffff829750a0 RDI=ffffffff889c19e0 RBP=ffffffff889c19a0 RSP=ffff888019446fe8 R8 =0000000000000001 R9 =ffffed1003288dee R10=0000000000000000 R11=20736b636f6c2034 R12=0000000000000028 R13=ffffffff889c19f0 R14=ffffffff889c19a0 R15=ffffffff889c1c60 RIP=ffffffff829750f5 RFL=00000006 [-----P-] 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 00007f4f0dbdd5c0 00000000 00000000 GS =0000 ffff8880e5342000 00000000 00000000 LDT=0000 fffffe1600000000 00000000 00000000 TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000001000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007f4f0dbe2000 CR3=000000001f2b8000 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=ffffffff84d1a2ce RDX=fffffbfff0b82d11 RSI=0000000000000004 RDI=ffffffff85c16880 RBP=ffffffff85c16880 RSP=ffff88801bc07b40 R8 =0000000000000000 R9 =fffffbfff0b82d10 R10=ffffffff85c16883 R11=ffffffff81b3cf1a R12=1ffff11003780f69 R13=0000000000000003 R14=fffffbfff0b82d10 R15=ffff88801bc07b78 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 00007f4205f525c0 00000000 00000000 GS =0000 ffff8880e5442000 00000000 00000000 LDT=0000 fffffe4500000000 00000000 00000000 TR =0040 fffffe000004a000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000048000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007f4205df5c70 CR3=000000001f2be000 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=00000000000000000000000020cdfd68 XMM05=00007ffda56b5fd000007ffda56b5f8e XMM06=00007ffda56b5f5f00007ffda56b5f34 XMM07=00000000000000000000000000000000 XMM08=6d726574206e6f6974616c69706d6f63 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=0000000000000000000000e40fe2c1fc