el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 hfs: new node 0 already hashed? ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5204 at fs/hfs/bnode.c:520 hfs_bnode_create+0x40c/0x4c4 fs/hfs/bnode.c:519 Modules linked in: CPU: 1 PID: 5204 Comm: syz.1.206 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : hfs_bnode_create+0x40c/0x4c4 fs/hfs/bnode.c:519 lr : hfs_bnode_create+0x40c/0x4c4 fs/hfs/bnode.c:519 sp : ffff800021826e00 x29: ffff800021826e20 x28: ffff700004304dd4 x27: dfff800000000000 x26: 0000000000000080 x25: 0000000000000000 x24: ffff0000dcbf5e88 x23: dfff800000000000 x22: 0000000000000000 x21: ffff0000c3414000 x20: 0000000000000000 x19: ffff0000dcbf5e00 x18: ffff800011b9bf60 x17: 0000000000000000 x16: ffff8000082d92bc x15: 0000000000000000 x14: 0000000000000001 x13: 1ffff00004304d28 x12: 0000000000ff0100 x11: ff00800008311668 x10: 0000000000000000 x9 : e640b57ae0ffe500 x8 : e640b57ae0ffe500 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000218268d8 x4 : ffff800015304cc0 x3 : ffff80000a890350 x2 : ffff00019f552d10 x1 : 0000000100000000 x0 : 000000000000001f Call trace: hfs_bnode_create+0x40c/0x4c4 fs/hfs/bnode.c:519 hfs_bmap_alloc+0x4fc/0x5ac fs/hfs/btree.c:291 hfs_btree_inc_height+0x108/0x890 fs/hfs/brec.c:490 hfs_brec_insert+0x5c4/0x97c fs/hfs/brec.c:148 __hfs_ext_write_extent+0x22c/0x484 fs/hfs/extent.c:124 __hfs_ext_cache_extent+0x84/0x74c fs/hfs/extent.c:174 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_extend_file+0x2d0/0x1094 fs/hfs/extent.c:401 hfs_get_block+0x324/0xa3c fs/hfs/extent.c:353 __block_write_begin_int+0x350/0x1388 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin fs/buffer.c:2102 [inline] cont_write_begin+0x53c/0x780 fs/buffer.c:2456 hfs_write_begin+0x98/0xe4 fs/hfs/inode.c:58 generic_perform_write+0x234/0x4f4 mm/filemap.c:3862 __generic_file_write_iter+0x130/0x250 mm/filemap.c:3960 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:3989 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3ec/0x7f0 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __arm64_sys_pwrite64+0x174/0x20c fs/read_write.c:706 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 4056 hardirqs last enabled at (4055): [] __up_console_sem+0xb4/0xfc kernel/printk/printk.c:261 hardirqs last disabled at (4056): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (4050): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (4050): [] handle_softirqs+0xaec/0xc60 kernel/softirq.c:624 softirqs last disabled at (4033): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ kernel BUG at fs/hfs/bnode.c:565! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 5204 Comm: syz.1.206 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 pstate: 82400005 (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 : ffff800021826f00 x29: ffff800021826f00 x28: 0000000000000001 x27: dfff800000000000 x26: ffff700004304df4 x25: ffff800021826fa0 x24: 1fffe0001b97ebc0 x23: ffff0000c3414000 x22: dfff800000000000 x21: 0000000000000000 x20: ffff0000dcbf5e80 x19: ffff0000dcbf5e00 x18: ffff800011b9bf60 x17: 0000000000000000 x16: ffff8000082eef80 x15: 0000000000000000 x14: 0000000000000001 x13: 1fffe0001b97ebd0 x12: 0000000000ff0100 x11: ff00800008fa1f50 x10: 0000000000000000 x9 : ffff800008fa1f50 x8 : ffff0000d75ed340 x7 : ffff800008941b94 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800008fa1c54 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:565 hfs_btree_inc_height+0x458/0x890 fs/hfs/brec.c:544 hfs_brec_insert+0x5c4/0x97c fs/hfs/brec.c:148 __hfs_ext_write_extent+0x22c/0x484 fs/hfs/extent.c:124 __hfs_ext_cache_extent+0x84/0x74c fs/hfs/extent.c:174 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_extend_file+0x2d0/0x1094 fs/hfs/extent.c:401 hfs_get_block+0x324/0xa3c fs/hfs/extent.c:353 __block_write_begin_int+0x350/0x1388 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin fs/buffer.c:2102 [inline] cont_write_begin+0x53c/0x780 fs/buffer.c:2456 hfs_write_begin+0x98/0xe4 fs/hfs/inode.c:58 generic_perform_write+0x234/0x4f4 mm/filemap.c:3862 __generic_file_write_iter+0x130/0x250 mm/filemap.c:3960 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:3989 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3ec/0x7f0 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __arm64_sys_pwrite64+0x174/0x20c fs/read_write.c:706 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Code: aa1403e0 97e5155f 17ffffce 97d42593 (d4210000) ---[ end trace 0000000000000000 ]---