bn = 0, index = 0 bn = 72c, index = 96 bn = 0, index = 0 bn = 0, index = 0 general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 6007 Comm: syz.1.21 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:metapage_writepage+0xa3/0x11f0 fs/jfs/jfs_metapage.c:340 Code: f3 e8 01 4e 81 fe 4c 8d 73 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 07 8e d9 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 ee 8d d9 fe 4d 8b 2e 43 c6 44 3c RSP: 0018:ffffc90005407700 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffea0000c5cbc0 RCX: 0000000000080000 RDX: ffffc9000cb19000 RSI: 0000000000020c83 RDI: 0000000000020c84 RBP: ffffc900054077f0 R08: ffffea0000c5cbf7 R09: 1ffffd400018b97e R10: dffffc0000000000 R11: fffff9400018b97f R12: 1ffff92000a80ee8 R13: ffffea0000c5cbf4 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007fc3b04e06c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5a74b85fc0 CR3: 000000005f262000 CR4: 00000000003506e0 Call Trace: metapage_write_one+0x2d3/0x790 fs/jfs/jfs_metapage.c:710 release_metapage+0x48a/0x870 fs/jfs/jfs_metapage.c:778 dtSearch+0x1c45/0x21b0 fs/jfs/jfs_dtree.c:793 jfs_symlink+0x854/0xfa0 fs/jfs/namei.c:1016 vfs_symlink+0x138/0x2b0 fs/namei.c:4481 do_symlinkat+0x1ba/0x400 fs/namei.c:4507 __do_sys_symlinkat fs/namei.c:4523 [inline] __se_sys_symlinkat fs/namei.c:4520 [inline] __x64_sys_symlinkat+0x99/0xb0 fs/namei.c:4520 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fc3af59ce59 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:00007fc3b04e0028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007fc3af815fa0 RCX: 00007fc3af59ce59 RDX: 00002000000005c0 RSI: ffffffffffffff9c RDI: 0000200000000700 RBP: 00007fc3af632d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc3af816038 R14: 00007fc3af815fa0 R15: 00007ffe7ec38ee8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:metapage_writepage+0xa3/0x11f0 fs/jfs/jfs_metapage.c:340 Code: f3 e8 01 4e 81 fe 4c 8d 73 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 07 8e d9 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 ee 8d d9 fe 4d 8b 2e 43 c6 44 3c RSP: 0018:ffffc90005407700 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffea0000c5cbc0 RCX: 0000000000080000 RDX: ffffc9000cb19000 RSI: 0000000000020c83 RDI: 0000000000020c84 RBP: ffffc900054077f0 R08: ffffea0000c5cbf7 R09: 1ffffd400018b97e R10: dffffc0000000000 R11: fffff9400018b97f R12: 1ffff92000a80ee8 R13: ffffea0000c5cbf4 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007fc3b04e06c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9be17f4000 CR3: 000000005f262000 CR4: 00000000003506e0 ---------------- Code disassembly (best guess): 0: f3 e8 01 4e 81 fe repz call 0xfe814e07 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 07 8e d9 fe call 0xfed98e27 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 ee 8d d9 fe call 0xfed98e27 39: 4d 8b 2e mov (%r14),%r13 3c: 43 rex.XB 3d: c6 .byte 0xc6 3e: 44 rex.R 3f: 3c .byte 0x3c