Oops: general protection fault, probably for non-canonical address 0xdffffc0000000046: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000230-0x0000000000000237] CPU: 0 UID: 0 PID: 5927 Comm: syz.3.81 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:fuse_dev_install fs/fuse/dev.c:493 [inline] RIP: 0010:fuse_dev_alloc_install+0x39/0x80 fs/fuse/dev.c:508 Code: e8 bc f8 ff ff 48 89 c3 48 85 c0 74 47 e8 1f 8f 7f fe 49 8d be 30 02 00 00 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 05 e8 ac b7 e9 fe 49 8b 96 30 02 00 00 49 c7 86 30 RSP: 0018:ffffc90003f27710 EFLAGS: 00010202 RAX: 0000000000000046 RBX: ffff88803246cc00 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8e316c42 RDI: 0000000000000230 RBP: ffff88801cf5ea90 R08: ffffffff9074e1f7 R09: 1ffffffff20e9c3e R10: dffffc0000000000 R11: fffffbfff20e9c3f R12: ffff88807d1b9040 R13: ffff88807d1b9010 R14: 0000000000000000 R15: ffff88807d1b9000 FS: 000055556be51500(0000) GS:ffff888124ddc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff53552ba40 CR3: 00000000715b4000 CR4: 00000000003526f0 Call Trace: cuse_channel_open+0x107/0x7c0 fs/fuse/cuse.c:524 misc_open+0x2d5/0x350 drivers/char/misc.c:163 chrdev_open+0x4cd/0x5e0 fs/char_dev.c:411 do_dentry_open+0x785/0x14e0 fs/open.c:947 vfs_open+0x3b/0x340 fs/open.c:1079 do_open fs/namei.c:4699 [inline] path_openat+0x2e08/0x3860 fs/namei.c:4858 do_file_open+0x23e/0x4a0 fs/namei.c:4887 do_sys_openat2+0x113/0x200 fs/open.c:1364 do_sys_open fs/open.c:1370 [inline] __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1381 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff53559c819 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:00007ffc1c95e1d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007ff535815fa0 RCX: 00007ff53559c819 RDX: 0000000000000002 RSI: 0000200000000040 RDI: ffffffffffffff9c RBP: 00007ff535632c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff535815fac R14: 00007ff535815fa0 R15: 00007ff535815fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:fuse_dev_install fs/fuse/dev.c:493 [inline] RIP: 0010:fuse_dev_alloc_install+0x39/0x80 fs/fuse/dev.c:508 Code: e8 bc f8 ff ff 48 89 c3 48 85 c0 74 47 e8 1f 8f 7f fe 49 8d be 30 02 00 00 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 05 e8 ac b7 e9 fe 49 8b 96 30 02 00 00 49 c7 86 30 RSP: 0018:ffffc90003f27710 EFLAGS: 00010202 RAX: 0000000000000046 RBX: ffff88803246cc00 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8e316c42 RDI: 0000000000000230 RBP: ffff88801cf5ea90 R08: ffffffff9074e1f7 R09: 1ffffffff20e9c3e R10: dffffc0000000000 R11: fffffbfff20e9c3f R12: ffff88807d1b9040 R13: ffff88807d1b9010 R14: 0000000000000000 R15: ffff88807d1b9000 FS: 000055556be51500(0000) GS:ffff888124edc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558cdb73dee8 CR3: 00000000715b4000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: e8 bc f8 ff ff call 0xfffff8c1 5: 48 89 c3 mov %rax,%rbx 8: 48 85 c0 test %rax,%rax b: 74 47 je 0x54 d: e8 1f 8f 7f fe call 0xfe7f8f31 12: 49 8d be 30 02 00 00 lea 0x230(%r14),%rdi 19: 48 89 f8 mov %rdi,%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: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 05 je 0x35 30: e8 ac b7 e9 fe call 0xfee9b7e1 35: 49 8b 96 30 02 00 00 mov 0x230(%r14),%rdx 3c: 49 rex.WB 3d: c7 .byte 0xc7 3e: 86 30 xchg %dh,(%rax)