BUG: unable to handle page fault for address: ffffed104b6677ff
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23fff2067 P4D 23fff2067 PUD 23fff0067 PMD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 5029 Comm: syz.7.1120 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:fuse_dev_do_write+0x178a/0x46e0 fs/fuse/dev.c:1953
Code: 61 b2 ff 4d 8b 36 4c 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 66 2d 00 00 45 8b 3f 41 ff cf 4d 01 f7 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 67 2d 00 00 41 c6 07 00 41 bf a0 00 00
RSP: 0018:ffffc90000f8f8e0 EFLAGS: 00010a07
RAX: 1ffff1104b6677ff RBX: 1ffff110254f6a3d RCX: 0000000000080000
RDX: ffffc90004748000 RSI: 0000000000000054 RDI: 0000000000000055
RBP: ffffc90000f8fbe8 R08: dffffc0000000000 R09: fffff9400099c927
R10: fffff9400099c927 R11: 1ffffd400099c926 R12: 1ffff110254f6a3a
R13: dffffc0000000000 R14: ffff88815b33c000 R15: ffff88825b33bfff
FS: 00007f2bde09f6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed104b6677ff CR3: 0000000171eb1000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
fuse_dev_write+0xf3/0x130 fs/fuse/dev.c:2003
call_write_iter include/linux/fs.h:2212 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x802/0xf70 fs/read_write.c:594
ksys_write+0x140/0x240 fs/read_write.c:647
__do_sys_write fs/read_write.c:659 [inline]
__se_sys_write fs/read_write.c:656 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:656
x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
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: 0033:0x7f2bdf679749
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:00007f2bde09f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2bdf8d0180 RCX: 00007f2bdf679749
RDX: 0000000000000010 RSI: 00002000000004c0 RDI: 0000000000000003
RBP: 00007f2bdf6fdf91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2bdf8d0218 R14: 00007f2bdf8d0180 R15: 00007ffde1141028
</TASK>
Modules linked in:
CR2: ffffed104b6677ff
---[ end trace f8d23ff5ac0a032a ]---
RIP: 0010:fuse_dev_do_write+0x178a/0x46e0 fs/fuse/dev.c:1953
Code: 61 b2 ff 4d 8b 36 4c 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 66 2d 00 00 45 8b 3f 41 ff cf 4d 01 f7 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 67 2d 00 00 41 c6 07 00 41 bf a0 00 00
RSP: 0018:ffffc90000f8f8e0 EFLAGS: 00010a07
RAX: 1ffff1104b6677ff RBX: 1ffff110254f6a3d RCX: 0000000000080000
RDX: ffffc90004748000 RSI: 0000000000000054 RDI: 0000000000000055
RBP: ffffc90000f8fbe8 R08: dffffc0000000000 R09: fffff9400099c927
R10: fffff9400099c927 R11: 1ffffd400099c926 R12: 1ffff110254f6a3a
R13: dffffc0000000000 R14: ffff88815b33c000 R15: ffff88825b33bfff
FS: 00007f2bde09f6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed104b6677ff CR3: 0000000171eb1000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: b2 ff mov $0xff,%dl
2: 4d 8b 36 mov (%r14),%r14
5: 4c 89 f8 mov %r15,%rax
8: 48 c1 e8 03 shr $0x3,%rax
c: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
11: 84 c0 test %al,%al
13: 0f 85 66 2d 00 00 jne 0x2d7f
19: 45 8b 3f mov (%r15),%r15d
1c: 41 ff cf dec %r15d
1f: 4d 01 f7 add %r14,%r15
22: 4c 89 f8 mov %r15,%rax
25: 48 c1 e8 03 shr $0x3,%rax
* 29: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 0f 85 67 2d 00 00 jne 0x2d9d
36: 41 c6 07 00 movb $0x0,(%r15)
3a: 41 rex.B
3b: bf .byte 0xbf
3c: a0 .byte 0xa0