------------[ cut here ]------------ kernel BUG at fs/ext4/inode.c:2618! invalid opcode: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 1 PID: 12259 Comm: syz-executor3 Not tainted 4.9.135+ #116 task: ffff8801abf497c0 task.stack: ffff8801a8238000 RIP: 0010:[] [] mpage_prepare_extent_to_map+0x719/0x9a0 fs/ext4/inode.c:2618 RSP: 0018:ffff8801a823f2d8 EFLAGS: 00010212 RAX: 0000000000040000 RBX: ffffea0006104f80 RCX: ffffc9000370e000 RDX: 000000000003be47 RSI: ffffffff816c4ee9 RDI: ffffea0006104f90 RBP: ffff8801a823f498 R08: ffff8801abf4a070 R09: 0000000000024bb0 R10: ffffffffffffffe8 R11: 0000000000000000 R12: 0000000000000008 R13: 00000000000000d0 R14: dffffc0000000000 R15: ffff8801a823f600 FS: 00007f23fbcb7700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f228000 CR3: 00000001c6a7b000 CR4: 00000000001606b0 Stack: 1ffff10035047e6a ffff8801a823f370 ffff8801a823f608 ffff8801a823f610 0000000200000246 000000000007fffe ffff8801a4200bf8 0000000e0000000c 7fffffffffffffbf ffff8801a823f3b0 ffff8801a823f618 ffffed0035047ec1 Call Trace: [] ext4_writepages+0xeee/0x2e00 fs/ext4/inode.c:2780 [] do_writepages+0xef/0x1d0 mm/page-writeback.c:2331 [] __filemap_fdatawrite_range+0x1a9/0x250 mm/filemap.c:390 [] filemap_write_and_wait_range+0x59/0xb0 mm/filemap.c:578 [] generic_file_read_iter+0x776/0x1a80 mm/filemap.c:1957 [] generic_file_splice_read+0x2bd/0x4e0 fs/splice.c:309 [] do_splice_to+0x10c/0x170 fs/splice.c:899 [] splice_direct_to_actor+0x23f/0x7e0 fs/splice.c:971 [] do_splice_direct+0x1a3/0x270 fs/splice.c:1080 [] do_sendfile+0x4f0/0xc30 fs/read_write.c:1393 [] SYSC_sendfile64 fs/read_write.c:1448 [inline] [] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1440 [] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: fc ff ff 48 89 95 b0 fe ff ff e8 13 66 c5 ff 48 8b 95 b0 fe ff ff 48 8d 42 ff e9 6f ff ff ff e8 fe 65 c5 ff 0f 0b e8 f7 65 c5 ff <0f> 0b 31 c0 89 85 b0 fe ff ff e8 e8 65 c5 ff 8b 85 18 ff ff ff RIP [] mpage_prepare_extent_to_map+0x719/0x9a0 fs/ext4/inode.c:2618 RSP ---[ end trace 3a64cdac80521290 ]---