btstack dump: bn = 0, index = 0 bn = 72c, index = 96 bn = 0, index = 0 bn = 72c, index = 96 bn = 0, index = 0 bn = 72c, index = 96 bn = 0, index = 0 bn = 0, index = 0 general protection fault, probably for non-canonical address 0xdffffc0000000037: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001b8-0x00000000000001bf] CPU: 1 PID: 4375 Comm: syz.2.18 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:write_one_page+0x2a6/0x660 mm/page-writeback.c:2431 Code: 04 00 00 00 e8 eb 0d 1d 00 f0 41 ff 06 48 8b 44 24 10 48 8d 98 b8 01 00 00 48 89 d8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df <42> 80 3c 28 00 74 08 48 89 df e8 1b 0c 1d 00 48 8b 1b 48 89 d8 48 RSP: 0018:ffffc9000329f800 EFLAGS: 00010202 RAX: 0000000000000037 RBX: 00000000000001b8 RCX: ffffffff81a12025 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffea000179cb74 RBP: ffffc9000329f918 R08: ffffea000179cb77 R09: 1ffffd40002f396e R10: dffffc0000000000 R11: fffff940002f396f R12: ffffea000179cb48 R13: dffffc0000000000 R14: ffffea000179cb74 R15: 1ffff92000653f04 FS: 00007f91895716c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f55b63bb000 CR3: 000000002230f000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: release_metapage+0x654/0xe10 fs/jfs/jfs_metapage.c:750 dtSearch+0x1b43/0x2050 fs/jfs/jfs_dtree.c:793 jfs_symlink+0x851/0xfb0 fs/jfs/namei.c:1016 vfs_symlink+0x247/0x3d0 fs/namei.c:4437 do_symlinkat+0x1ab/0x6b0 fs/namei.c:4466 __do_sys_symlink fs/namei.c:4488 [inline] __se_sys_symlink fs/namei.c:4486 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4486 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f918b338819 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:00007f9189571028 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 00007f918b5b2090 RCX: 00007f918b338819 RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000200000001640 RBP: 00007f918b3cec91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f918b5b2128 R14: 00007f918b5b2090 R15: 00007ffc66b5ffa8 Modules linked in: ---[ end trace 3d05fb7cc2915eb4 ]--- RIP: 0010:write_one_page+0x2a6/0x660 mm/page-writeback.c:2431 Code: 04 00 00 00 e8 eb 0d 1d 00 f0 41 ff 06 48 8b 44 24 10 48 8d 98 b8 01 00 00 48 89 d8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df <42> 80 3c 28 00 74 08 48 89 df e8 1b 0c 1d 00 48 8b 1b 48 89 d8 48 RSP: 0018:ffffc9000329f800 EFLAGS: 00010202 RAX: 0000000000000037 RBX: 00000000000001b8 RCX: ffffffff81a12025 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffea000179cb74 RBP: ffffc9000329f918 R08: ffffea000179cb77 R09: 1ffffd40002f396e R10: dffffc0000000000 R11: fffff940002f396f R12: ffffea000179cb48 R13: dffffc0000000000 R14: ffffea000179cb74 R15: 1ffff92000653f04 FS: 00007f91895716c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000fb4000 CR3: 000000002230f000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 04 00 add $0x0,%al 2: 00 00 add %al,(%rax) 4: e8 eb 0d 1d 00 call 0x1d0df4 9: f0 41 ff 06 lock incl (%r14) d: 48 8b 44 24 10 mov 0x10(%rsp),%rax 12: 48 8d 98 b8 01 00 00 lea 0x1b8(%rax),%rbx 19: 48 89 d8 mov %rbx,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 27: fc ff df * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 1b 0c 1d 00 call 0x1d0c54 39: 48 8b 1b mov (%rbx),%rbx 3c: 48 89 d8 mov %rbx,%rax 3f: 48 rex.W