bisecting fixing commit since 7f2c5eb458b8855655a19c44cd0043f7f83c595f
building syzkaller on 96dd36234d97bbf6b403f3a7f03cfc0296422879
testing commit 7f2c5eb458b8855655a19c44cd0043f7f83c595f with gcc (GCC) 8.1.0
kernel signature: 3293586db54f6251f7d28b1a95c939d72803947971ad6ae588c2e853ebb2adef
run #0: crashed: general protection fault in __smc_diag_dump
run #1: crashed: general protection fault in __smc_diag_dump
run #2: crashed: KASAN: use-after-free Read in __smc_diag_dump
run #3: crashed: general protection fault in __smc_diag_dump
run #4: crashed: general protection fault in __smc_diag_dump
run #5: crashed: KASAN: use-after-free Read in __smc_diag_dump
run #6: crashed: general protection fault in __smc_diag_dump
run #7: crashed: general protection fault in __smc_diag_dump
run #8: crashed: general protection fault in __smc_diag_dump
run #9: crashed: general protection fault in __smc_diag_dump
testing current HEAD 1752938529c614a8ed4432ecce6ebc95d3b87207
testing commit 1752938529c614a8ed4432ecce6ebc95d3b87207 with gcc (GCC) 8.1.0
kernel signature: 2c0e3d30dc7f162eca8807245a8dc615bfe664e11b98792decc8b041ce21956d
run #0: crashed: KASAN: use-after-free Read in __smc_diag_dump
run #1: crashed: KASAN: use-after-free Read in __smc_diag_dump
run #2: crashed: KASAN: use-after-free Read in __smc_diag_dump
run #3: crashed: KASAN: use-after-free Read in __smc_diag_dump
run #4: crashed: KASAN: use-after-free Read in __smc_diag_dump
run #5: crashed: KASAN: use-after-free Read in __smc_diag_dump
run #6: crashed: general protection fault in __smc_diag_dump
run #7: crashed: general protection fault in __smc_diag_dump
run #8: crashed: general protection fault in __smc_diag_dump
run #9: crashed: general protection fault in __smc_diag_dump
revisions tested: 2, total time: 23m0.964317664s (build: 17m9.522720899s, test: 5m21.033027843s)
the crash still happens on HEAD
commit msg: Linux 4.14.213
crash: general protection fault in __smc_diag_dump
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
Bluetooth: hci0 command 0x0409 tx timeout
Bluetooth: hci1 command 0x0409 tx timeout
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7486 Comm: syz-executor.5 Not tainted 4.14.213-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8881ef3e80c0 task.stack: ffff8881d3910000
RIP: 0010:smc_diag_msg_common_fill net/smc/smc_diag.c:46 [inline]
RIP: 0010:__smc_diag_dump.isra.1+0x307/0x1620 net/smc/smc_diag.c:81
RSP: 0018:ffff8881d3917448 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: ffff8881d3917610 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff8881ce431b7c RDI: 000000000000000e
RBP: ffff8881d3917638 R08: ffffed1039c86372 R09: ffff8881ce431b50
R10: ffffed1039c86371 R11: ffff8881ce431b8f R12: ffff8881ce431b40
R13: ffff8881d43048c0 R14: ffff8881d3a0f580 R15: ffff8881ea640790
FS:  00007f1547f01700(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe30399e428 CR3: 00000001df275004 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 smc_diag_dump+0x1dc/0x2a0 net/smc/smc_diag.c:169
 netlink_dump+0x373/0x9b0 net/netlink/af_netlink.c:2203
 __netlink_dump_start+0x4cc/0x770 net/netlink/af_netlink.c:2300
 netlink_dump_start include/linux/netlink.h:217 [inline]
 smc_diag_handler_dump+0x197/0x220 net/smc/smc_diag.c:190
 __sock_diag_cmd net/core/sock_diag.c:231 [inline]
 sock_diag_rcv_msg+0x252/0x350 net/core/sock_diag.c:263
 netlink_rcv_skb+0x12f/0x3b0 net/netlink/af_netlink.c:2433
 sock_diag_rcv+0x25/0x40 net/core/sock_diag.c:274
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x40b/0x610 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x657/0xc60 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xac/0xf0 net/socket.c:656
 ___sys_sendmsg+0x625/0x920 net/socket.c:2062
 __sys_sendmsg+0xc1/0x140 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0xd/0x20 net/socket.c:2103
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45cc79
RSP: 002b:00007f1547f00c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002bec0 RCX: 000000000045cc79
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffc0e616eaf R14: 00007f1547f019c0 R15: 000000000078bf0c
Code: df 48 89 f9 48 c1 e9 03 80 3c 11 00 0f 85 ca 10 00 00 48 8b 50 20 48 b8 00 00 00 00 00 fc ff df 48 8d 7a 0e 48 89 f9 48 c1 e9 03 <0f> b6 0c 01 48 89 f8 83 e0 07 83 c0 01 38 c8 7c 08 84 c9 0f 85 
RIP: smc_diag_msg_common_fill net/smc/smc_diag.c:46 [inline] RSP: ffff8881d3917448
RIP: __smc_diag_dump.isra.1+0x307/0x1620 net/smc/smc_diag.c:81 RSP: ffff8881d3917448
---[ end trace 2c2ba24e635dea2b ]---