Hi, I am fuzzing linux 4.13-rc7 with XFS using syzkaller on x86_64 and I found the following warning: WARNING: CPU: 2 PID: 5391 at fs/iomap.c:993 iomap_dio_rw+0xc79/0xe70 fs/iomap.c:993 Kernel panic - not syncing: panic_on_warn set ... CPU: 2 PID: 5391 Comm: syz-executor1 Not tainted 4.13.0-rc7 #4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0xf7/0x1aa lib/dump_stack.c:52 panic+0x1ae/0x3a7 kernel/panic.c:180 __warn+0x1c4/0x1d9 kernel/panic.c:541 report_bug+0x211/0x2d0 lib/bug.c:183 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:190 do_trap_no_signal arch/x86/kernel/traps.c:224 [inline] do_trap+0x260/0x390 arch/x86/kernel/traps.c:273 do_error_trap+0x118/0x340 arch/x86/kernel/traps.c:310 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:323 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:846 RIP: 0010:iomap_dio_rw+0xc79/0xe70 fs/iomap.c:993 RSP: 0018:ffff88006d13f6d0 EFLAGS: 00010297 RAX: ffff880069c3da00 RBX: ffff88006d04c000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffed000da27ed0 RBP: ffff88006d13f8c0 R08: 0000000000000001 R09: 1ffff1000da27ddb R10: ffff88006d13eea0 R11: 0000000000000002 R12: 1ffff1000da27eea R13: 000000007ffff000 R14: 0000000000000000 R15: ffff88006d13fac8 xfs_file_dio_aio_read+0x19c/0x5a0 fs/xfs/xfs_file.c:220 xfs_file_read_iter+0x369/0x460 fs/xfs/xfs_file.c:286 call_read_iter include/linux/fs.h:1737 [inline] generic_file_splice_read+0x3f9/0x7b0 fs/splice.c:307 do_splice_to+0x10a/0x160 fs/splice.c:896 splice_direct_to_actor+0x23e/0x870 fs/splice.c:968 do_splice_direct+0x29b/0x3c0 fs/splice.c:1077 do_sendfile+0x5c9/0xe80 fs/read_write.c:1412 SYSC_sendfile64 fs/read_write.c:1467 [inline] SyS_sendfile64+0xbd/0x160 fs/read_write.c:1459 entry_SYSCALL_64_fastpath+0x18/0xad RIP: 0033:0x451e59 RSP: 002b:00007fa4a3718c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 0000000000451e59 RDX: 0000000020005ff8 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 0000000000000046 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000800000000 R11: 0000000000000216 R12: 0000000000000000 R13: 00007ffde54a34ef R14: 00007fa4a37199c0 R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: 0x18a00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) Rebooting in 86400 seconds.. Here is a reproducer program: https://pastebin.com/tc014k97 Here are my configs: https://pastebin.com/PWtYUiHD
