bisecting fixing commit since c3038e718a19fc596f7b1baba0f83d5146dc7784 building syzkaller on d01bb02a96019cda0fa8c46e5c6d5eb66a273f17 testing commit c3038e718a19fc596f7b1baba0f83d5146dc7784 with gcc (GCC) 8.1.0 kernel signature: fc17e5b6374f7ff9f028c067c495e0fdb55fa9bc9d5147c5331818a60825f63e 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: general protection fault in do_blockdev_direct_IO run #4: crashed: general protection fault in do_blockdev_direct_IO run #5: crashed: KASAN: global-out-of-bounds Read 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 961f830af0658ef5ef8a7708786d634a6115f16b testing commit 961f830af0658ef5ef8a7708786d634a6115f16b with gcc (GCC) 8.1.0 kernel signature: 3b3edbc92e82d9108da55f710d973dae9b5ae6001eaf00b3100197755d608bff run #0: crashed: general protection fault in do_blockdev_direct_IO run #1: crashed: KASAN: global-out-of-bounds Read 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: 25m47.282989168s (build: 18m23.275269494s, test: 5m57.237951326s) the crash still happens on HEAD commit msg: Linux 4.19.138 crash: general protection fault in do_blockdev_direct_IO IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready kasan: CONFIG_KASAN_INLINE enabled IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready kasan: GPF could be caused by NULL-ptr deref or user memory access bridge0: port 2(bridge_slave_1) entered blocking state general protection fault: 0000 [#1] PREEMPT SMP KASAN bridge0: port 2(bridge_slave_1) entered forwarding state CPU: 1 PID: 7289 Comm: syz-executor.3 Not tainted 4.19.138-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline] RIP: 0010:compound_head include/linux/page-flags.h:142 [inline] RIP: 0010:get_page include/linux/mm.h:931 [inline] RIP: 0010:submit_page_section fs/direct-io.c:889 [inline] RIP: 0010:do_direct_IO fs/direct-io.c:1096 [inline] RIP: 0010:do_blockdev_direct_IO+0x1bc4/0x6d30 fs/direct-io.c:1332 Code: 41 ff 0c 24 0f 85 46 ff ff ff 4c 89 ef e8 94 d5 d5 ff e9 39 ff ff ff 48 8b 84 24 f0 00 00 00 48 8d 78 08 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 1d 42 00 00 48 8b b4 24 f0 00 00 00 48 8b 46 RSP: 0018:ffff888095c9f450 EFLAGS: 00010202 IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81a7fc49 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000008 RBP: ffff888095c9f790 R08: fffff940004bbc07 R09: fffff940004bbc06 R10: fffff940004bbc06 R11: ffffea00025de037 R12: dffffc0000000000 R13: ffffea00025de000 R14: ffffea00025de034 R15: ffff88809584ba40 FS: 00007f5262475700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready CR2: 00005593bc1fb970 CR3: 0000000095cb2000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready __blockdev_direct_IO+0x72/0xd9 fs/direct-io.c:1418 ext4_direct_IO_write fs/ext4/inode.c:3769 [inline] ext4_direct_IO+0x87d/0x17d0 fs/ext4/inode.c:3907 generic_file_direct_write+0x1ee/0x410 mm/filemap.c:3065 IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready __generic_file_write_iter+0x270/0x580 mm/filemap.c:3244 ext4_file_write_iter+0x282/0xe60 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] do_iter_readv_writev+0x4ae/0x960 fs/read_write.c:681 IPv6: ADDRCONF(NETDEV_UP): veth0_to_hsr: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready do_iter_write+0x12a/0x510 fs/read_write.c:960 vfs_iter_write+0x5b/0xb0 fs/read_write.c:973 iter_file_splice_write+0x558/0xc30 fs/splice.c:750 hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network do_splice_from fs/splice.c:852 [inline] do_splice+0x4fd/0x12d0 fs/splice.c:1154 IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready __do_sys_splice fs/splice.c:1428 [inline] __se_sys_splice fs/splice.c:1408 [inline] __x64_sys_splice+0x248/0x300 fs/splice.c:1408 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459f79 Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5262474c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459f79 RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52624756d4 R13: 00000000004c9bcf R14: 00000000004e0790 R15: 00000000ffffffff Modules linked in: 8021q: adding VLAN 0 to HW filter on device batadv0 ---[ end trace e31224d8c06ce85b ]--- IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline] RIP: 0010:compound_head include/linux/page-flags.h:142 [inline] RIP: 0010:get_page include/linux/mm.h:931 [inline] RIP: 0010:submit_page_section fs/direct-io.c:889 [inline] RIP: 0010:do_direct_IO fs/direct-io.c:1096 [inline] RIP: 0010:do_blockdev_direct_IO+0x1bc4/0x6d30 fs/direct-io.c:1332 Code: 41 ff 0c 24 0f 85 46 ff ff ff 4c 89 ef e8 94 d5 d5 ff e9 39 ff ff ff 48 8b 84 24 f0 00 00 00 48 8d 78 08 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 1d 42 00 00 48 8b b4 24 f0 00 00 00 48 8b 46 IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready RSP: 0018:ffff888095c9f450 EFLAGS: 00010202 IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81a7fc49 IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000008 8021q: adding VLAN 0 to HW filter on device team0 RBP: ffff888095c9f790 R08: fffff940004bbc07 R09: fffff940004bbc06 IPv6: ADDRCONF(NETDEV_UP): veth0_to_hsr: link is not ready R10: fffff940004bbc06 R11: ffffea00025de037 R12: dffffc0000000000 IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready R13: ffffea00025de000 R14: ffffea00025de034 R15: ffff88809584ba40 IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready FS: 00007f5262475700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready CR2: 00007fccc462c000 CR3: 0000000095cb2000 CR4: 00000000001406e0 IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready