Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 UID: 0 PID: 9449 Comm: syz.6.690 Not tainted 6.16.0-rc4-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] RIP: 0010:jfs_flush_journal+0x94b/0xed0 fs/jfs/jfs_logmgr.c:1582 Code: c3 81 fe 4d 8d 75 d8 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 73 1b e3 fe 4d 8b 36 49 83 c6 30 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 57 1b e3 fe 49 8b 3e e8 4f 82 b8 fe RSP: 0018:ffffc90003affb20 EFLAGS: 00010206 RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc9000caac000 RSI: 00000000000038bb RDI: 00000000000038bc RBP: ffffc90003affc60 R08: ffffc90003affa7f R09: 0000000000000000 R10: ffffc90003aff908 R11: fffff5200075ff50 R12: 0000000000000002 R13: ffff888033873838 R14: 0000000000000030 R15: ffff888077536228 FS: 00007ff3a69246c0(0000) GS:ffff888125d84000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8716227000 CR3: 0000000028dd0000 CR4: 00000000003526f0 Call Trace: jfs_umount_rw+0x75/0x130 fs/jfs/jfs_umount.c:134 jfs_reconfigure+0x6f6/0xa00 fs/jfs/super.c:421 reconfigure_super+0x227/0x890 fs/super.c:1077 do_remount fs/namespace.c:3386 [inline] path_mount+0xd18/0xfe0 fs/namespace.c:4218 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4427 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff3a5b8e929 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:00007ff3a6924038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ff3a5db5fa0 RCX: 00007ff3a5b8e929 RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000000 RBP: 00007ff3a5c10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000021 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff3a5db5fa0 R15: 00007ffc31188b78 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] RIP: 0010:jfs_flush_journal+0x94b/0xed0 fs/jfs/jfs_logmgr.c:1582 Code: c3 81 fe 4d 8d 75 d8 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 73 1b e3 fe 4d 8b 36 49 83 c6 30 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 57 1b e3 fe 49 8b 3e e8 4f 82 b8 fe RSP: 0018:ffffc90003affb20 EFLAGS: 00010206 RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc9000caac000 RSI: 00000000000038bb RDI: 00000000000038bc RBP: ffffc90003affc60 R08: ffffc90003affa7f R09: 0000000000000000 R10: ffffc90003aff908 R11: fffff5200075ff50 R12: 0000000000000002 R13: ffff888033873838 R14: 0000000000000030 R15: ffff888077536228 FS: 00007ff3a69246c0(0000) GS:ffff888125d84000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffee4cefd58 CR3: 0000000028dd0000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: c3 ret 1: 81 fe 4d 8d 75 d8 cmp $0xd8758d4d,%esi 7: 4c 89 f0 mov %r14,%rax a: 48 c1 e8 03 shr $0x3,%rax e: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 12: 74 08 je 0x1c 14: 4c 89 f7 mov %r14,%rdi 17: e8 73 1b e3 fe call 0xfee31b8f 1c: 4d 8b 36 mov (%r14),%r14 1f: 49 83 c6 30 add $0x30,%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 f7 mov %r14,%rdi 33: e8 57 1b e3 fe call 0xfee31b8f 38: 49 8b 3e mov (%r14),%rdi 3b: e8 4f 82 b8 fe call 0xfeb8828f