hfs: new node 0 already hashed? ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7377 at fs/hfs/bnode.c:520 hfs_bnode_create+0x384/0x430 fs/hfs/bnode.c:519 Modules linked in: CPU: 0 UID: 0 PID: 7377 Comm: kworker/u8:25 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Workqueue: writeback wb_workfn (flush-7:3) pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : hfs_bnode_create+0x384/0x430 fs/hfs/bnode.c:519 lr : hfs_bnode_create+0x384/0x430 fs/hfs/bnode.c:519 sp : ffff8000a0da6c30 x29: ffff8000a0da6c40 x28: 0000000000000000 x27: dfff800000000000 x26: 0000000000000080 x25: dfff800000000000 x24: 0000000000000000 x23: ffff000103df308c x22: 0000000000000000 x21: 0000000000000000 x20: ffff0000c6a1a000 x19: ffff0000d1586000 x18: 1fffe00033797688 x17: ffff80008f7de000 x16: ffff80008b0155d8 x15: 0000000000000001 x14: 1ffff000141b4cfc x13: 0000000000000000 x12: 0000000000000000 x11: ffff7000141b4cfd x10: 0000000000ff0100 x9 : 1cbab001fbaf9f00 x8 : 1cbab001fbaf9f00 x7 : ffff800080490a90 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff8000807de538 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000001f Call trace: hfs_bnode_create+0x384/0x430 fs/hfs/bnode.c:519 (P) hfs_bmap_alloc+0x5b0/0x688 fs/hfs/btree.c:326 hfs_btree_inc_height+0xf8/0x870 fs/hfs/brec.c:471 hfs_brec_insert+0x5bc/0x96c fs/hfs/brec.c:148 __hfs_ext_write_extent+0x230/0x488 fs/hfs/extent.c:124 hfs_ext_write_extent+0x144/0x1bc fs/hfs/extent.c:144 hfs_write_inode+0xbc/0x704 fs/hfs/inode.c:429 write_inode fs/fs-writeback.c:1525 [inline] __writeback_single_inode+0x5ac/0x13e8 fs/fs-writeback.c:1745 writeback_sb_inodes+0x55c/0xe40 fs/fs-writeback.c:1976 wb_writeback+0x3cc/0xd70 fs/fs-writeback.c:2156 wb_do_writeback fs/fs-writeback.c:2303 [inline] wb_workfn+0x338/0xdc0 fs/fs-writeback.c:2343 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 irq event stamp: 53534 hardirqs last enabled at (53533): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1531 [inline] hardirqs last enabled at (53533): [] finish_lock_switch+0xb0/0x1c0 kernel/sched/core.c:5105 hardirqs last disabled at (53534): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:434 softirqs last enabled at (53440): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (53440): [] batadv_nc_purge_paths+0x2f4/0x37c net/batman-adv/network-coding.c:471 softirqs last disabled at (53438): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (53438): [] batadv_nc_purge_paths+0xd0/0x37c net/batman-adv/network-coding.c:442 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ kernel BUG at fs/hfs/bnode.c:565! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 7377 Comm: kworker/u8:25 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Workqueue: writeback wb_workfn (flush-7:3) pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:565 lr : hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:565 sp : ffff8000a0da6d20 x29: ffff8000a0da6d20 x28: 0000000000000302 x27: dfff800000000000 x26: ffff7000141b4db8 x25: ffff8000a0da6dc0 x24: 1fffe0001a2b0c00 x23: ffff0000c6a1a000 x22: dfff800000000000 x21: 0000000000000000 x20: ffff0000d1586080 x19: ffff0000d1586000 x18: 1fffe00033797688 x17: ffff80008f7de000 x16: ffff8000805353bc x15: 0000000000000001 x14: 1fffe0001a2b0c10 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001a2b0c11 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000de853d00 x7 : ffff80008af7fbc0 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008130621c x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:565 (P) hfs_btree_inc_height+0x448/0x870 fs/hfs/brec.c:525 hfs_brec_insert+0x5bc/0x96c fs/hfs/brec.c:148 __hfs_ext_write_extent+0x230/0x488 fs/hfs/extent.c:124 hfs_ext_write_extent+0x144/0x1bc fs/hfs/extent.c:144 hfs_write_inode+0xbc/0x704 fs/hfs/inode.c:429 write_inode fs/fs-writeback.c:1525 [inline] __writeback_single_inode+0x5ac/0x13e8 fs/fs-writeback.c:1745 writeback_sb_inodes+0x55c/0xe40 fs/fs-writeback.c:1976 wb_writeback+0x3cc/0xd70 fs/fs-writeback.c:2156 wb_do_writeback fs/fs-writeback.c:2303 [inline] wb_workfn+0x338/0xdc0 fs/fs-writeback.c:2343 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Code: aa1403e0 97e59f70 17ffffce 97d0a3ea (d4210000) ---[ end trace 0000000000000000 ]---