bisecting fixing commit since b98aebd298246df37b472c52a2ee1023256d02e3 building syzkaller on 8c88c9c1c99c8cd8dabc951164c820b9c9f25114 testing commit b98aebd298246df37b472c52a2ee1023256d02e3 with gcc (GCC) 8.1.0 kernel signature: b49d76725eaca024bad581040a463c04a09ab619 run #0: crashed: general protection fault in do_blockdev_direct_IO run #1: crashed: general protection fault in do_blockdev_direct_IO run #2: crashed: general protection fault in do_blockdev_direct_IO run #3: crashed: KASAN: global-out-of-bounds Read in do_blockdev_direct_IO run #4: crashed: general protection fault in do_blockdev_direct_IO run #5: crashed: general protection fault in do_blockdev_direct_IO run #6: crashed: general protection fault in do_blockdev_direct_IO run #7: crashed: general protection fault in do_blockdev_direct_IO run #8: crashed: general protection fault in do_blockdev_direct_IO run #9: crashed: general protection fault in do_blockdev_direct_IO testing current HEAD b0cdffaa546e24acf92ab3b0d4e917a51aff6a82 testing commit b0cdffaa546e24acf92ab3b0d4e917a51aff6a82 with gcc (GCC) 8.1.0 kernel signature: db2c294acaabd4fa918a015e6c1b39979de4ca56 run #0: crashed: KASAN: use-after-free Read in class_equal run #1: crashed: general protection fault in do_blockdev_direct_IO run #2: crashed: general protection fault in do_blockdev_direct_IO run #3: crashed: general protection fault in do_blockdev_direct_IO run #4: crashed: general protection fault in do_blockdev_direct_IO run #5: crashed: general protection fault in do_blockdev_direct_IO run #6: crashed: general protection fault in do_blockdev_direct_IO run #7: crashed: general protection fault in do_blockdev_direct_IO run #8: crashed: general protection fault in do_blockdev_direct_IO run #9: crashed: general protection fault in do_blockdev_direct_IO revisions tested: 2, total time: 22m46.791447764s (build: 15m55.95174268s, test: 6m22.177537018s) the crash still happens on HEAD commit msg: Linux 4.14.163 crash: general protection fault in do_blockdev_direct_IO IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready kasan: CONFIG_KASAN_INLINE enabled IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready kasan: GPF could be caused by NULL-ptr deref or user memory access IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready general protection fault: 0000 [#1] PREEMPT SMP KASAN IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready Modules linked in: IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready CPU: 0 PID: 6873 Comm: syz-executor.0 Not tainted 4.14.163-syzkaller #0 IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a68b4200 task.stack: ffff888074058000 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:compound_head include/linux/page-flags.h:147 [inline] RIP: 0010:get_page include/linux/mm.h:828 [inline] RIP: 0010:submit_page_section fs/direct-io.c:890 [inline] RIP: 0010:do_direct_IO fs/direct-io.c:1097 [inline] RIP: 0010:do_blockdev_direct_IO+0x18fb/0x6bf0 fs/direct-io.c:1336 RSP: 0018:ffff88807405f490 EFLAGS: 00010202 RAX: 0000000000000004 RBX: ffffea000282221c RCX: 000000000000000c RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020 RBP: ffff88807405f7a0 R08: 0000000000000000 R09: ffff8880a084e680 R10: ffffed1014109ce0 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000000 R14: ffffea0002822200 R15: ffff888075cbba40 FS: 00007f7e74c98700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001e72a20 CR3: 00000000845cb000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: IPv6: ADDRCONF(NETDEV_UP): veth0_to_hsr: link is not ready __blockdev_direct_IO+0x72/0xd9 fs/direct-io.c:1422 ext4_direct_IO_write fs/ext4/inode.c:3712 [inline] ext4_direct_IO+0x6ed/0x1b00 fs/ext4/inode.c:3848 generic_file_direct_write+0x1ee/0x410 mm/filemap.c:2950 __generic_file_write_iter+0x270/0x580 mm/filemap.c:3129 ext4_file_write_iter+0x279/0xe70 fs/ext4/file.c:268 IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready kobject: 'bonding_slave' (ffff888075d92f58): kobject_add_internal: parent: 'bond_slave_1', set: '' call_write_iter include/linux/fs.h:1777 [inline] do_iter_readv_writev+0x460/0x900 fs/read_write.c:675 do_iter_write+0x12b/0x520 fs/read_write.c:954 vfs_iter_write+0x5b/0xb0 fs/read_write.c:967 iter_file_splice_write+0x540/0xc20 fs/splice.c:749 bond0: Enslaving bond_slave_1 as an active interface with an up link kobject: 'veth0_to_team' (ffff8880955e67f0): kobject_add_internal: parent: 'net', set: 'devices' do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0x6e9/0x1580 fs/splice.c:1382 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459a59 RSP: 002b:00007f7e74c97c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459a59 RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7e74c986d4 R13: 00000000004c954e R14: 00000000004dffb0 R15: 00000000ffffffff Code: ff ff 48 8b bc 24 e0 00 00 00 48 c7 c6 00 85 94 86 e8 ea fa e0 ff 0f 0b 48 8b 84 24 e0 00 00 00 48 8d 78 20 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 f3 44 00 00 48 8b 9c 24 e0 00 00 00 48 8b RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff88807405f490 RIP: compound_head include/linux/page-flags.h:147 [inline] RSP: ffff88807405f490 RIP: get_page include/linux/mm.h:828 [inline] RSP: ffff88807405f490 RIP: submit_page_section fs/direct-io.c:890 [inline] RSP: ffff88807405f490 RIP: do_direct_IO fs/direct-io.c:1097 [inline] RSP: ffff88807405f490 RIP: do_blockdev_direct_IO+0x18fb/0x6bf0 fs/direct-io.c:1336 RSP: ffff88807405f490 ---[ end trace 15de6efca0c4c0f1 ]--- kobject: 'veth0_to_team' (ffff8880955e67f0): kobject_uevent_env