bn = 0, index = 0 bn = 72c, index = 96 bn = 0, index = 0 bn = 72c, index = 96 bn = 0, index = 0 bn = 0, index = 0 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 6904 Comm: syz.5.204 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:metapage_write_folio+0xa7/0xcf0 fs/jfs/jfs_metapage.c:428 Code: fe 48 89 5c 24 18 4c 8d 73 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 93 84 d5 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 7a 84 d5 fe 49 8b 1e 43 c6 44 3c RSP: 0018:ffffc90003c5f540 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffea000166b040 RCX: 0000000000080000 RDX: ffffc9001a6c0000 RSI: 000000000000eb4e RDI: 000000000000eb4f RBP: ffffc90003c5f650 R08: ffffea000166b077 R09: 1ffffd40002cd60e R10: dffffc0000000000 R11: fffff940002cd60f R12: 1ffff9200078beb4 R13: ffffea000166b040 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f8f82ff06c0(0000) GS:ffff8881252b4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000563431bab660 CR3: 000000002d26a000 CR4: 00000000003526f0 Call Trace: metapage_write_one+0x2c8/0x520 fs/jfs/jfs_metapage.c:818 release_metapage+0x5be/0xac0 fs/jfs/jfs_metapage.c:884 dtSearch+0x1c4e/0x21b0 fs/jfs/jfs_dtree.c:793 jfs_symlink+0x857/0xfd0 fs/jfs/namei.c:1018 vfs_symlink+0x195/0x340 fs/namei.c:5615 filename_symlinkat+0x1cd/0x410 fs/namei.c:5640 __do_sys_symlinkat fs/namei.c:5660 [inline] __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8f8219aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8f82ff0028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007f8f82415fa0 RCX: 00007f8f8219aeb9 RDX: 00002000000007c0 RSI: 0000000000000005 RDI: 0000200000000440 RBP: 00007f8f82208c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8f82416038 R14: 00007f8f82415fa0 R15: 00007ffd1685adf8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:metapage_write_folio+0xa7/0xcf0 fs/jfs/jfs_metapage.c:428 Code: fe 48 89 5c 24 18 4c 8d 73 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 93 84 d5 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 7a 84 d5 fe 49 8b 1e 43 c6 44 3c RSP: 0018:ffffc90003c5f540 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffea000166b040 RCX: 0000000000080000 RDX: ffffc9001a6c0000 RSI: 000000000000eb4e RDI: 000000000000eb4f RBP: ffffc90003c5f650 R08: ffffea000166b077 R09: 1ffffd40002cd60e R10: dffffc0000000000 R11: fffff940002cd60f R12: 1ffff9200078beb4 R13: ffffea000166b040 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f8f82ff06c0(0000) GS:ffff8881252b4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f585f3ff000 CR3: 000000002d26a000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: fe 48 89 decb -0x77(%rax) 3: 5c pop %rsp 4: 24 18 and $0x18,%al 6: 4c 8d 73 18 lea 0x18(%rbx),%r14 a: 4c 89 f0 mov %r14,%rax d: 48 c1 e8 03 shr $0x3,%rax 11: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 16: 74 08 je 0x20 18: 4c 89 f7 mov %r14,%rdi 1b: e8 93 84 d5 fe call 0xfed584b3 20: 4d 8b 36 mov (%r14),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 7a 84 d5 fe call 0xfed584b3 39: 49 8b 1e mov (%r14),%rbx 3c: 43 rex.XB 3d: c6 .byte 0xc6 3e: 44 rex.R 3f: 3c .byte 0x3c