Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 UID: 0 PID: 6008 Comm: syz.3.71 Not tainted 6.12.0-rc1-syzkaller-00330-gfc20a3e57247 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:diRead+0x43c/0xbc0 fs/jfs/jfs_imap.c:342 Code: 08 00 4c 8b 64 24 18 74 08 48 89 ef e8 7d 10 d4 fe 48 8b 5d 00 48 83 c3 34 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 84 05 00 00 8b 1b bf 40 00 00 00 89 de e8 RSP: 0018:ffffc900037efaa0 EFLAGS: 00010207 RAX: 0000000000000006 RBX: 0000000000000034 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020 RBP: ffff8880294d1ca0 R08: ffffffff83275340 R09: 1ffff1100c2294b5 R10: dffffc0000000000 R11: ffffed100c2294b6 R12: 0000000000000000 R13: 000000000000001c R14: 0000000000000000 R15: ffff88806114a910 FS: 00007f10ec94e6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6bf2604000 CR3: 000000006d452000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: jfs_iget+0x86/0x3e0 fs/jfs/inode.c:35 jfs_nfs_get_inode+0x30/0xd0 fs/jfs/namei.c:1484 generic_fh_to_dentry+0x9f/0xf0 fs/libfs.c:1468 exportfs_decode_fh_raw+0x166/0x6a0 fs/exportfs/expfs.c:444 do_handle_to_path fs/fhandle.c:224 [inline] handle_to_path fs/fhandle.c:325 [inline] do_handle_open+0x764/0x9a0 fs/fhandle.c:343 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f10ebb7dff9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f10ec94e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000130 RAX: ffffffffffffffda RBX: 00007f10ebd35f80 RCX: 00007f10ebb7dff9 RDX: 0000000000101142 RSI: 0000000020000340 RDI: 0000000000000004 RBP: 00007f10ebbf0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f10ebd35f80 R15: 00007ffde59e2628 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:diRead+0x43c/0xbc0 fs/jfs/jfs_imap.c:342 Code: 08 00 4c 8b 64 24 18 74 08 48 89 ef e8 7d 10 d4 fe 48 8b 5d 00 48 83 c3 34 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 84 05 00 00 8b 1b bf 40 00 00 00 89 de e8 RSP: 0018:ffffc900037efaa0 EFLAGS: 00010207 RAX: 0000000000000006 RBX: 0000000000000034 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020 RBP: ffff8880294d1ca0 R08: ffffffff83275340 R09: 1ffff1100c2294b5 R10: dffffc0000000000 R11: ffffed100c2294b6 R12: 0000000000000000 R13: 000000000000001c R14: 0000000000000000 R15: ffff88806114a910 FS: 00007f10ec94e6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005557f2388208 CR3: 000000006d452000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 08 00 or %al,(%rax) 2: 4c 8b 64 24 18 mov 0x18(%rsp),%r12 7: 74 08 je 0x11 9: 48 89 ef mov %rbp,%rdi c: e8 7d 10 d4 fe call 0xfed4108e 11: 48 8b 5d 00 mov 0x0(%rbp),%rbx 15: 48 83 c3 34 add $0x34,%rbx 19: 48 89 d8 mov %rbx,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 84 05 00 00 jne 0x5ba 36: 8b 1b mov (%rbx),%ebx 38: bf 40 00 00 00 mov $0x40,%edi 3d: 89 de mov %ebx,%esi 3f: e8 .byte 0xe8