bisecting fixing commit since c3038e718a19fc596f7b1baba0f83d5146dc7784
building syzkaller on d01bb02a96019cda0fa8c46e5c6d5eb66a273f17
testing commit c3038e718a19fc596f7b1baba0f83d5146dc7784 with gcc (GCC) 8.1.0
kernel signature: ee7a766f4321350974ca1206a819072e3f38892ae9dab637b25be51b8a8bb4a4
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: slab-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 b94de4d19498b454645b72d08a05d32fa9074fb5
testing commit b94de4d19498b454645b72d08a05d32fa9074fb5 with gcc (GCC) 8.1.0
kernel signature: 33e51337607adf876506c048af8ae7eaa74adafec71fc4f28076dda755d7fe34
run #0: crashed: general protection fault in do_blockdev_direct_IO
run #1: crashed: general protection fault in corrupted
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: 22m43.295377478s (build: 16m33.005114561s, test: 5m14.173842889s)
the crash still happens on HEAD
commit msg: Linux 4.19.155
crash: general protection fault in do_blockdev_direct_IO
IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
kasan: CONFIG_KASAN_INLINE enabled
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
kasan: GPF could be caused by NULL-ptr deref or user memory access
IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
general protection fault: 0000 [#1] PREEMPT SMP KASAN
bridge0: port 2(bridge_slave_1) entered blocking state
CPU: 1 PID: 7260 Comm: syz-executor.2 Not tainted 4.19.155-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 e4 c4 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:ffff888099b27450 EFLAGS: 00010202
bridge0: port 2(bridge_slave_1) entered forwarding state
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81a81ce9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000008
RBP: ffff888099b27790 R08: fffff940004c2187 R09: fffff940004c2186
R10: fffff940004c2186 R11: ffffea0002610c37 R12: dffffc0000000000
R13: ffffea0002610c00 R14: ffffea0002610c34 R15: ffff8880b0631a40
FS:  00007f6448196700(0000) GS:ffff8880ba700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ffdec21550 CR3: 00000000b0be6000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: 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
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready
 generic_file_direct_write+0x1ee/0x410 mm/filemap.c:3073
 __generic_file_write_iter+0x270/0x580 mm/filemap.c:3252
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready
 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
 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
 do_splice_from fs/splice.c:852 [inline]
 do_splice+0x4fd/0x12d0 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
 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:00007f6448195c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459f79
RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f64481966d4
IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
R13: 00000000004c9bcf R14: 00000000004e0790 R15: 00000000ffffffff
Modules linked in:
---[ end trace b7876fd095bb0113 ]---
IPv6: ADDRCONF(NETDEV_UP): veth0_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
IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready
Code: 41 ff 0c 24 0f 85 46 ff ff ff 4c 89 ef e8 e4 c4 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
hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
RSP: 0018:ffff888099b27450 EFLAGS: 00010202
IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81a81ce9
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000008
RBP: ffff888099b27790 R08: fffff940004c2187 R09: fffff940004c2186
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
R10: fffff940004c2186 R11: ffffea0002610c37 R12: dffffc0000000000
IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
R13: ffffea0002610c00 R14: ffffea0002610c34 R15: ffff8880b0631a40
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready
FS:  00007f6448196700(0000) GS:ffff8880ba700000(0000) knlGS:0000000000000000
IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready
CR2: 00007f954c03b0e8 CR3: 00000000b0be6000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400