bisecting fixing commit since c3038e718a19fc596f7b1baba0f83d5146dc7784
building syzkaller on d01bb02a96019cda0fa8c46e5c6d5eb66a273f17
testing commit c3038e718a19fc596f7b1baba0f83d5146dc7784 with gcc (GCC) 8.4.1 20210217
kernel signature: 637e829fc2073c9d0dc006c9555642816f8e669da71a7efa1b1625ff4f51c37f
all runs: crashed: general protection fault in do_blockdev_direct_IO
testing current HEAD 2965db2e004cf9c92b87c1f559e9812c0ae878c1
testing commit 2965db2e004cf9c92b87c1f559e9812c0ae878c1 with gcc (GCC) 8.4.1 20210217
kernel signature: d9c4e6c622191d0d2698c65504346ac58e7def19bc0673690a3ff8b8dbedb374
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: 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: kernel BUG in do_blockdev_direct_IO
run #9: crashed: general protection fault in do_blockdev_direct_IO
revisions tested: 2, total time: 22m30.102379071s (build: 15m43.94664231s, test: 6m4.897950583s)
the crash still happens on HEAD
commit msg: Linux 4.19.188
crash: general protection fault in do_blockdev_direct_IO
kasan: CONFIG_KASAN_INLINE enabled
IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
kasan: GPF could be caused by NULL-ptr deref or user memory access
IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
general protection fault: 0000 [#1] PREEMPT SMP KASAN
IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
CPU: 1 PID: 6524 Comm: syz-executor.1 Not tainted 4.19.188-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:261 [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:890 [inline]
RIP: 0010:do_direct_IO fs/direct-io.c:1097 [inline]
RIP: 0010:do_blockdev_direct_IO+0xeb0/0x6f70 fs/direct-io.c:1333
Code: 00 00 48 c7 84 24 90 02 00 00 00 00 00 00 45 85 e4 0f 85 35 0c 00 00 48 8b 84 24 f0 00 00 00 48 8d 78 08 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 ba 51 00 00 48 8b b4 24 f0 00 00 00 48 8b 46 08
RSP: 0018:ffff8881e8cef450 EFLAGS: 00010202
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffffffff81a536ce
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000008
RBP: ffff8881e8cef790 R08: fffff94000f4e787 R09: fffff94000f4e786
R10: fffff94000f4e786 R11: ffffea0007a73c37 R12: 0000000000000000
R13: ffffea0007a73c00 R14: ffffea0007a73c34 R15: ffff8881cf95fa40
FS:  00007f6658e9f700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fada04ef000 CR3: 00000001e8f50004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready
8021q: adding VLAN 0 to HW filter on device team0
 __blockdev_direct_IO+0x72/0xe0 fs/direct-io.c:1419
 ext4_direct_IO_write fs/ext4/inode.c:3777 [inline]
 ext4_direct_IO+0x87f/0x17d0 fs/ext4/inode.c:3915
 generic_file_direct_write+0x1ee/0x410 mm/filemap.c:3073
 __generic_file_write_iter+0x279/0x590 mm/filemap.c:3252
 ext4_file_write_iter+0x282/0xe60 fs/ext4/file.c:272
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
 call_write_iter include/linux/fs.h:1821 [inline]
 do_iter_readv_writev+0x4ae/0x960 fs/read_write.c:681
IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
bridge0: port 2(bridge_slave_1) entered blocking state
 do_iter_write fs/read_write.c:960 [inline]
 do_iter_write+0x12a/0x510 fs/read_write.c:941
 vfs_iter_write+0x5b/0xb0 fs/read_write.c:973
 iter_file_splice_write+0x55d/0xc40 fs/splice.c:750
bridge0: port 2(bridge_slave_1) entered forwarding state
 do_splice_from fs/splice.c:852 [inline]
 do_splice+0xa25/0x12b0 fs/splice.c:1154
 __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
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x461949
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6658e9f1a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 0000000000461949
RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000006 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004f8f90 R14: 00000000004b50c4 R15: 00007f6658e9f6bc
Modules linked in:
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
---[ end trace e786cff9980288e2 ]---
IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
RIP: 0010:__read_once_size include/linux/compiler.h:261 [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:890 [inline]
RIP: 0010:do_direct_IO fs/direct-io.c:1097 [inline]
RIP: 0010:do_blockdev_direct_IO+0xeb0/0x6f70 fs/direct-io.c:1333
bridge0: port 1(bridge_slave_0) entered blocking state
Code: 00 00 48 c7 84 24 90 02 00 00 00 00 00 00 45 85 e4 0f 85 35 0c 00 00 48 8b 84 24 f0 00 00 00 48 8d 78 08 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 ba 51 00 00 48 8b b4 24 f0 00 00 00 48 8b 46 08
bridge0: port 1(bridge_slave_0) entered forwarding state
RSP: 0018:ffff8881e8cef450 EFLAGS: 00010202
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffffffff81a536ce
IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000008
bridge0: port 2(bridge_slave_1) entered blocking state
RBP: ffff8881e8cef790 R08: fffff94000f4e787 R09: fffff94000f4e786
bridge0: port 2(bridge_slave_1) entered forwarding state
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
R10: fffff94000f4e786 R11: ffffea0007a73c37 R12: 0000000000000000
IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
R13: ffffea0007a73c00 R14: ffffea0007a73c34 R15: ffff8881cf95fa40
bridge0: port 1(bridge_slave_0) entered blocking state
FS:  00007f6658e9f700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
bridge0: port 1(bridge_slave_0) entered forwarding state
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready
CR2: 00007fada0548010 CR3: 00000001e8f50004 CR4: 00000000001606e0
IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400