WARNING: CPU: 0 PID: 19585 at fs/ext4/inode.c:945 ext4_dio_get_block_overwrite+0xbf/0x100 fs/ext4/inode.c:945 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 19585 Comm: syz-executor4 Not tainted 4.20.0-rc5+ #366 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 panic+0x2ad/0x55c kernel/panic.c:188 __warn.cold.8+0x20/0x45 kernel/panic.c:540 kobject: 'loop2' (00000000ec4f61ed): kobject_uevent_env report_bug+0x254/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969 RIP: 0010:ext4_dio_get_block_overwrite+0xbf/0x100 fs/ext4/inode.c:945 Code: ff 48 85 db 74 1f e8 80 07 66 ff 49 8b 1c 24 31 ff 48 c1 eb 0c 83 e3 01 48 89 de e8 9b 08 66 ff 48 85 db 74 07 e8 61 07 66 ff <0f> 0b e8 5a 07 66 ff 44 89 e8 5b 41 5c 41 5d 41 5e 5d c3 e8 49 07 kobject: 'loop2' (00000000ec4f61ed): fill_kobj_path: path = '/devices/virtual/block/loop2' RSP: 0018:ffff888184badc78 EFLAGS: 00010216 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc900079f4000 RDX: 000000000003a38c RSI: ffffffff8219945f RDI: 0000000000000007 RBP: ffff888184badc98 R08: ffff8881c30ae180 R09: ffffed102bcdccc1 R10: ffffed102bcdccc1 R11: ffff88815e6e660f R12: ffff888184bae980 R13: 0000000000000000 R14: 0000000000000030 R15: ffff888184baea20 kobject: 'loop3' (00000000c23b2c82): kobject_uevent_env kobject: 'loop3' (00000000c23b2c82): fill_kobj_path: path = '/devices/virtual/block/loop3' get_more_blocks fs/direct-io.c:716 [inline] do_direct_IO+0x1941/0xc110 fs/direct-io.c:1001 kobject: 'loop2' (00000000ec4f61ed): kobject_uevent_env kobject: 'loop2' (00000000ec4f61ed): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000c23b2c82): kobject_uevent_env kobject: 'loop3' (00000000c23b2c82): fill_kobj_path: path = '/devices/virtual/block/loop3' do_blockdev_direct_IO+0xc30/0x9db0 fs/direct-io.c:1331 __blockdev_direct_IO+0x9d/0xc6 fs/direct-io.c:1417 ext4_direct_IO_write fs/ext4/inode.c:3774 [inline] ext4_direct_IO+0x15b5/0x2230 fs/ext4/inode.c:3901 generic_file_direct_write+0x275/0x4b0 mm/filemap.c:3043 __generic_file_write_iter+0x2ff/0x630 mm/filemap.c:3222 ext4_file_write_iter+0x390/0x1420 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1857 [inline] do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680 do_iter_write+0x185/0x5f0 fs/read_write.c:959 vfs_iter_write+0x77/0xb0 fs/read_write.c:972 iter_file_splice_write+0x90d/0x1050 fs/splice.c:749 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x128/0x190 fs/splice.c:1018 splice_direct_to_actor+0x318/0x8f0 fs/splice.c:973 do_splice_direct+0x2d4/0x420 fs/splice.c:1061 do_sendfile+0x62a/0xe20 fs/read_write.c:1439 __do_sys_sendfile64 fs/read_write.c:1500 [inline] __se_sys_sendfile64 fs/read_write.c:1486 [inline] __x64_sys_sendfile64+0x1fd/0x250 fs/read_write.c:1486 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8896840c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008801600 R11: 0000000000000246 R12: 00007f88968416d4 R13: 00000000004c3c2a R14: 00000000004d6230 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..