EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir486931293/syzkaller.Kmycec/5/file0 supports timestamps until 2038-01-19 (0x7fffffff) ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.3/287 is trying to release lock (rcu_read_lock) at: [] __wait_on_freeing_inode+0x105/0x350 but there are no more locks to release! other info that might help us debug this: 4 locks held by syz-executor.3/287: #0: ffff88800f9663f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801b530d68 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f972950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe32/0x12d0 #3: ffffffff85c16898 (inode_hash_lock){+.+.}-{3:3}, at: insert_inode_locked+0xf9/0x890 stack backtrace: CPU: 1 UID: 0 PID: 287 Comm: syz-executor.3 Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xca/0x120 print_unlock_imbalance_bug+0x118/0x130 lock_release+0x1ee/0x270 __wait_on_freeing_inode+0x10a/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_mkdir+0x331/0xb30 vfs_mkdir+0x6d8/0xc00 filename_mkdirat+0x118/0x430 __x64_sys_mkdir+0x6e/0xd0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f17300edc27 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffca0a39ff8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffca0a3a080 RCX: 00007f17300edc27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007ffca0a3a080 RBP: 00007ffca0a3a05c R08: 0000000000000000 R09: 0000000000000003 R10: 00007ffca0a39d97 R11: 0000000000000202 R12: 0000000000000032 R13: 000000000002a234 R14: 0000000000000005 R15: 00007ffca0a3a0c0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.3/287 Modules linked in: CPU: 1 UID: 0 PID: 287 Comm: syz-executor.3 Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__rcu_read_unlock+0x25f/0x5c0 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 RSP: 0018:ffff88806cf08e58 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff8880162f5280 RCX: 00000000fffe0da7 RDX: 0000000000000000 RSI: ffffffff814bd1ea RDI: ffff8880162f567c RBP: ffff8880162f5280 R08: 0000000000000010 R09: dffffc0000000000 R10: 0000000000000040 R11: 00000000000003bc R12: ffff8880162f5280 R13: 00000000fffe0de6 R14: ffff888009a63850 R15: 000000000000890e FS: 0000555576e24400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdcfc6e418 CR3: 000000000e5b1000 CR4: 0000000000350ef0 Call Trace: sched_balance_domains+0x2f4/0xbe0 handle_softirqs+0x1b1/0x7d0 __irq_exit_rcu+0xc4/0x100 irq_exit_rcu+0x9/0x20 sysvec_call_function_single+0xa6/0xc0 asm_sysvec_call_function_single+0x1a/0x20 RIP: 0010:__sanitizer_cov_trace_pc+0x4b/0x80 Code: 74 1d a9 00 00 0f 00 75 16 a9 00 00 f0 00 74 05 e9 2a 3f 5c 03 8b 82 dc 14 00 00 85 c0 75 05 e9 1b 3f 5c 03 8b 82 b8 14 00 00 <83> f8 02 75 f0 48 8b 8a c0 14 00 00 8b 92 bc 14 00 00 48 8b 01 48 RSP: 0018:ffff8880156b78a8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 000000000000fffe RCX: ffffffff810016ca RDX: ffff8880162f5280 RSI: ffffffff84c554d4 RDI: ffffffff815d742f RBP: ffff8880156b7938 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff815d742f R13: ffff8880156b7938 R14: 0000000000000002 R15: 000000000000000b report_bug+0x14/0x120 handle_bug+0x2e8/0x4f0 exc_invalid_op+0x35/0x80 asm_exc_invalid_op+0x1a/0x20 RIP: 0010:__rcu_read_unlock+0x25f/0x5c0 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 RSP: 0018:ffff8880156b79e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff8880162f5280 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff8880162f567c RBP: ffff8880162f5280 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880162f5280 R13: 0000000000000001 R14: ffffffff85c0dce0 R15: ffff88801b5e9fb0 __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_mkdir+0x331/0xb30 vfs_mkdir+0x6d8/0xc00 filename_mkdirat+0x118/0x430 __x64_sys_mkdir+0x6e/0xd0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f17300edc27 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffca0a39ff8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffca0a3a080 RCX: 00007f17300edc27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007ffca0a3a080 RBP: 00007ffca0a3a05c R08: 0000000000000000 R09: 0000000000000003 R10: 00007ffca0a39d97 R11: 0000000000000202 R12: 0000000000000032 R13: 000000000002a234 R14: 0000000000000005 R15: 00007ffca0a3a0c0 irq event stamp: 209887 hardirqs last enabled at (209887): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (209886): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (209882): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (209880): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir397926295/syzkaller.9KsJ46/7/file0 supports timestamps until 2038-01-19 (0x7fffffff) EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000. tmpfs: Bad value for 'mpol' tmpfs: Bad value for 'mpol' EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000. random: crng reseeded on system resumption Restarting kernel threads ... Done restarting kernel threads. loop5: detected capacity change from 0 to 512 loop2: detected capacity change from 0 to 640 EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. ext4 filesystem being mounted at /syzkaller-testdir486931293/syzkaller.Kmycec/6/file0 supports timestamps until 2038-01-19 (0x7fffffff) loop4: detected capacity change from 0 to 640 EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000. EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir397926295/syzkaller.9KsJ46/8/file0 supports timestamps until 2038-01-19 (0x7fffffff) loop6: detected capacity change from 0 to 640 EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir308601866/syzkaller.wybTSo/9/file0 supports timestamps until 2038-01-19 (0x7fffffff) loop5: detected capacity change from 0 to 512 EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000. EXT4-fs (loop6): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir290522904/syzkaller.2SDfF5/7/file0 supports timestamps until 2038-01-19 (0x7fffffff) EXT4-fs (loop4): unmounting filesystem 00000000-0000-0000-0000-000000000000. EXT4-fs (loop6): unmounting filesystem 00000000-0000-0000-0000-000000000000. loop6: detected capacity change from 0 to 640 loop5: detected capacity change from 0 to 512 loop2: detected capacity change from 0 to 640 EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. ext4 filesystem being mounted at /syzkaller-testdir486931293/syzkaller.Kmycec/7/file0 supports timestamps until 2038-01-19 (0x7fffffff) EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000. ext4 filesystem being mounted at /syzkaller-testdir397926295/syzkaller.9KsJ46/9/file0 supports timestamps until 2038-01-19 (0x7fffffff) EXT4-fs (loop6): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir290522904/syzkaller.2SDfF5/8/file0 supports timestamps until 2038-01-19 (0x7fffffff) EXT4-fs (loop6): unmounting filesystem 00000000-0000-0000-0000-000000000000. loop5: detected capacity change from 0 to 640 EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000. EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir486931293/syzkaller.Kmycec/8/file0 supports timestamps until 2038-01-19 (0x7fffffff) netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000. loop6: detected capacity change from 0 to 640 loop5: detected capacity change from 0 to 640 EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir486931293/syzkaller.Kmycec/9/file0 supports timestamps until 2038-01-19 (0x7fffffff) EXT4-fs (loop6): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir290522904/syzkaller.2SDfF5/9/file0 supports timestamps until 2038-01-19 (0x7fffffff) loop2: detected capacity change from 0 to 640 EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000. EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir397926295/syzkaller.9KsJ46/10/file0 supports timestamps until 2038-01-19 (0x7fffffff) loop7: detected capacity change from 0 to 640 EXT4-fs (loop6): unmounting filesystem 00000000-0000-0000-0000-000000000000. loop5: detected capacity change from 0 to 640 EXT4-fs (loop7): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir382509516/syzkaller.lEXBrw/13/file0 supports timestamps until 2038-01-19 (0x7fffffff) EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir486931293/syzkaller.Kmycec/10/file0 supports timestamps until 2038-01-19 (0x7fffffff) EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000. EXT4-fs (loop7): unmounting filesystem 00000000-0000-0000-0000-000000000000. EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000. ---------------- Code disassembly (best guess): 0: 74 1d je 0x1f 2: a9 00 00 0f 00 test $0xf0000,%eax 7: 75 16 jne 0x1f 9: a9 00 00 f0 00 test $0xf00000,%eax e: 74 05 je 0x15 10: e9 2a 3f 5c 03 jmpq 0x35c3f3f 15: 8b 82 dc 14 00 00 mov 0x14dc(%rdx),%eax 1b: 85 c0 test %eax,%eax 1d: 75 05 jne 0x24 1f: e9 1b 3f 5c 03 jmpq 0x35c3f3f 24: 8b 82 b8 14 00 00 mov 0x14b8(%rdx),%eax * 2a: 83 f8 02 cmp $0x2,%eax <-- trapping instruction 2d: 75 f0 jne 0x1f 2f: 48 8b 8a c0 14 00 00 mov 0x14c0(%rdx),%rcx 36: 8b 92 bc 14 00 00 mov 0x14bc(%rdx),%edx 3c: 48 8b 01 mov (%rcx),%rax 3f: 48 rex.W