bisecting fixing commit since 5076190daded2197f62fe92cf69674488be44175
building syzkaller on 2c31c529a9a44be5d99e769204b7a4b84b93eec1
testing commit 5076190daded2197f62fe92cf69674488be44175 with gcc (GCC) 8.1.0
kernel signature: f2d0643994fdc367c2ced6b1b4128efa34ef78d0c93738490a8615b7cca78ad0
all runs: crashed: general protection fault in sctp_ulpevent_nofity_peer_addr_change
testing current HEAD 12bf0b632ed090358cbf03e323e5342212d0b2e4
testing commit 12bf0b632ed090358cbf03e323e5342212d0b2e4 with gcc (GCC) 8.1.0
kernel signature: 5fe3b6092a305893f177b1bae5c6c97b2de7d4e18fe189bb71f425fca89a720d
run #0: crashed: general protection fault in sctp_ulpevent_nofity_peer_addr_change
run #1: crashed: general protection fault in sctp_ulpevent_nofity_peer_addr_change
run #2: crashed: general protection fault in sctp_ulpevent_nofity_peer_addr_change
run #3: crashed: general protection fault in sctp_ulpevent_nofity_peer_addr_change
run #4: crashed: general protection fault in sctp_ulpevent_nofity_peer_addr_change
run #5: crashed: general protection fault in sctp_ulpevent_nofity_peer_addr_change
run #6: crashed: general protection fault in sctp_ulpevent_nofity_peer_addr_change
run #7: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor196497356" "root@10.128.0.225:./syz-executor196497356"]: exit status 1
Connection timed out during banner exchange
lost connection

run #8: crashed: general protection fault in sctp_ulpevent_nofity_peer_addr_change
run #9: crashed: general protection fault in sctp_ulpevent_nofity_peer_addr_change
revisions tested: 2, total time: 32m33.542192404s (build: 11m41.233168239s, test: 20m23.067177577s)
the crash still happens on HEAD
commit msg: Merge tag 'nfs-for-5.7-5' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
crash: general protection fault in sctp_ulpevent_nofity_peer_addr_change
general protection fault, probably for non-canonical address 0xdffffc0000000017: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000b8-0x00000000000000bf]
CPU: 1 PID: 30923 Comm: syz-executor564 Not tainted 5.7.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:sctp_ulpevent_nofity_peer_addr_change+0xed/0xa30 net/sctp/ulpevent.c:347
Code: 80 3c 02 00 0f 85 f9 07 00 00 49 8b ac 24 a8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd bc 00 00 00 48 89 f9 48 c1 e9 03 <0f> b6 0c 01 48 89 f8 83 e0 07 83 c0 03 38 c8 7c 08 84 c9 0f 85 47
RSP: 0018:ffffc900037472b8 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000017
RDX: 1ffff1100887d040 RSI: 0000000000000000 RDI: 00000000000000bc
RBP: 0000000000000000 R08: fffff520006e8e70 R09: ffffc90003747300
R10: ffffc9000374737f R11: fffff520006e8e6f R12: ffff8880443e8158
R13: ffff8880443e81a0 R14: 0000000000000000 R15: 0000000000000004
FS:  0000000000000000(0000) GS:ffff8880ae900000(0063) knlGS:00000000096ff840
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020000180 CR3: 000000003d98e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sctp_assoc_set_primary+0x59/0x280 net/sctp/associola.c:435
 sctp_assoc_rm_peer+0x75a/0x980 net/sctp/associola.c:508
 sctp_assoc_update+0x4ae/0xd30 net/sctp/associola.c:1116
 sctp_cmd_assoc_update net/sctp/sm_sideeffect.c:836 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1305 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1185 [inline]
 sctp_do_sm+0x1edc/0x49a0 net/sctp/sm_sideeffect.c:1156
 sctp_assoc_bh_rcv+0x281/0x5d0 net/sctp/associola.c:1044
 sctp_backlog_rcv+0x1b7/0xfa0 net/sctp/input.c:344
 sk_backlog_rcv include/net/sock.h:996 [inline]
 __release_sock+0x116/0x350 net/core/sock.c:2459
 release_sock+0x4a/0x170 net/core/sock.c:2975
 sctp_wait_for_connect+0x241/0x450 net/sctp/socket.c:9295
 __sctp_connect+0x7df/0xa60 net/sctp/socket.c:1240
 __sctp_setsockopt_connectx+0xec/0x140 net/sctp/socket.c:1336
 sctp_setsockopt_connectx net/sctp/socket.c:1368 [inline]
 sctp_setsockopt+0x93d/0x58e0 net/sctp/socket.c:4713
 __compat_sys_setsockopt+0x10d/0x260 net/compat.c:400
 __do_compat_sys_setsockopt net/compat.c:413 [inline]
 __se_compat_sys_setsockopt net/compat.c:410 [inline]
 __ia32_compat_sys_setsockopt+0xb4/0x150 net/compat.c:410
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x231/0xba0 arch/x86/entry/common.c:396
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Modules linked in:
---[ end trace 5af95df32d510262 ]---
RIP: 0010:sctp_ulpevent_nofity_peer_addr_change+0xed/0xa30 net/sctp/ulpevent.c:347
Code: 80 3c 02 00 0f 85 f9 07 00 00 49 8b ac 24 a8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd bc 00 00 00 48 89 f9 48 c1 e9 03 <0f> b6 0c 01 48 89 f8 83 e0 07 83 c0 03 38 c8 7c 08 84 c9 0f 85 47
RSP: 0018:ffffc900037472b8 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000017
RDX: 1ffff1100887d040 RSI: 0000000000000000 RDI: 00000000000000bc
RBP: 0000000000000000 R08: fffff520006e8e70 R09: ffffc90003747300
R10: ffffc9000374737f R11: fffff520006e8e6f R12: ffff8880443e8158
R13: ffff8880443e81a0 R14: 0000000000000000 R15: 0000000000000004
FS:  0000000000000000(0000) GS:ffff8880ae800000(0063) knlGS:00000000096ff840
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000ffce7f0c CR3: 000000003d98e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400