kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 7952 Comm: syz-executor881 Not tainted 4.14.258-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880aaee06c0 task.stack: ffff88809ca50000 RIP: 0010:vhost_umem_interval_tree_iter_first drivers/vhost/vhost.c:53 [inline] RIP: 0010:vhost_del_umem_range drivers/vhost/vhost.c:977 [inline] RIP: 0010:vhost_process_iotlb_msg drivers/vhost/vhost.c:1048 [inline] RIP: 0010:vhost_chr_write_iter drivers/vhost/vhost.c:1077 [inline] RIP: 0010:vhost_chr_write_iter+0x873/0x1100 drivers/vhost/vhost.c:1061 RSP: 0018:ffff88809ca57c00 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff888091b00140 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffffff8ba58d90 RDI: ffff888091b00200 RBP: ffffed1012360039 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: ffff8880aaee06c0 R12: 0000000000000002 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff1101394af87 FS: 0000555555b88300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000118e CR3: 00000000b612a000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: call_write_iter include/linux/fs.h:1780 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44c/0x630 fs/read_write.c:482 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f506a80f029 RSP: 002b:00007fffa502bdb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f506a80f029 RDX: 0000000000000048 RSI: 0000000020001100 RDI: 0000000000000003 RBP: 00007f506a7d3010 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f506a7d30a0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Code: ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 c6 06 00 00 4c 8b ab c0 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e9 48 c1 e9 03 <80> 3c 01 00 0f 85 8f 06 00 00 49 8b 6d 00 48 85 ed 0f 84 e4 03 RIP: vhost_umem_interval_tree_iter_first drivers/vhost/vhost.c:53 [inline] RSP: ffff88809ca57c00 RIP: vhost_del_umem_range drivers/vhost/vhost.c:977 [inline] RSP: ffff88809ca57c00 RIP: vhost_process_iotlb_msg drivers/vhost/vhost.c:1048 [inline] RSP: ffff88809ca57c00 RIP: vhost_chr_write_iter drivers/vhost/vhost.c:1077 [inline] RSP: ffff88809ca57c00 RIP: vhost_chr_write_iter+0x873/0x1100 drivers/vhost/vhost.c:1061 RSP: ffff88809ca57c00 ---[ end trace 7843c9833982fcea ]--- ---------------- Code disassembly (best guess), 1 bytes skipped: 0: df 48 89 fisttps -0x77(%rax) 3: f9 stc 4: 48 c1 e9 03 shr $0x3,%rcx 8: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1) c: 0f 85 c6 06 00 00 jne 0x6d8 12: 4c 8b ab c0 00 00 00 mov 0xc0(%rbx),%r13 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 4c 89 e9 mov %r13,%rcx 26: 48 c1 e9 03 shr $0x3,%rcx * 2a: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1) <-- trapping instruction 2e: 0f 85 8f 06 00 00 jne 0x6c3 34: 49 8b 6d 00 mov 0x0(%r13),%rbp 38: 48 85 ed test %rbp,%rbp 3b: 0f .byte 0xf 3c: 84 e4 test %ah,%ah 3e: 03 .byte 0x3