bisecting fixing commit since 14cfdbd39e316efd91ae6e403ef8211f0b022603
building syzkaller on 68660b21c27c417771037b3f1fe4aa072cfdeef9
testing commit 14cfdbd39e316efd91ae6e403ef8211f0b022603 with gcc (GCC) 8.1.0
kernel signature: 2a0bc43d75cc6fcc97194e3a42a980624bf114ba143f198f165d039e3f5fb85f
run #0: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #1: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #2: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #3: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #4: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #5: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #6: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #7: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #8: OK
run #9: OK
testing current HEAD d18b78abc0c6e7d3119367c931c583e02d466495
testing commit d18b78abc0c6e7d3119367c931c583e02d466495 with gcc (GCC) 8.1.0
kernel signature: 689082ed1a0c43f009aec6bf1f003c717cdb480ab8396f49d898b6c3cce16e14
run #0: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #1: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #2: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #3: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #4: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #5: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #6: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #7: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
run #8: OK
run #9: OK
revisions tested: 2, total time: 40m54.463429331s (build: 19m27.185815552s, test: 19m59.888973235s)
the crash still happens on HEAD
commit msg: Linux 4.19.141
crash: kernel BUG at net/sctp/sm_sideeffect.c:LINE!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_1
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
------------[ cut here ]------------
kernel BUG at net/sctp/sm_sideeffect.c:1538!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8009 Comm: syz-executor.5 Not tainted 4.19.141-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1538 [inline]
RIP: 0010:sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline]
RIP: 0010:sctp_do_sm+0x3a42/0x5040 net/sctp/sm_sideeffect.c:1170
Code: 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 74 08 3c 03 0f 8e d0 12 00 00 f6 83 b0 02 00 00 40 0f 85 7e e5 ff ff e9 a8 e5 ff ff <0f> 0b 49 8d 7d 12 48 89 fa 48 89 f9 48 c1 ea 03 83 e1 07 42 0f b6
RSP: 0018:ffff888091507958 EFLAGS: 00010246
RAX: ffff8880a7796bb0 RBX: ffff8880a77967c0 RCX: ffff8880a7796df0
RDX: 1ffff11014ef2d53 RSI: 0000000000000012 RDI: ffff8880a7796a98
RBP: ffff888091507c10 R08: ffff888091507b38 R09: ffff8880887357e8
R10: ffffed10110e4e08 R11: ffff888088727047 R12: 0000000000000000
R13: ffff888091507b78 R14: dffffc0000000000 R15: ffff888091507be8
FS:  00007febd46f1700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd84951dac CR3: 00000000a761f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sctp_primitive_SHUTDOWN+0x7c/0xc0 net/sctp/primitive.c:104
 sctp_close+0x354/0x750 net/sctp/socket.c:1560
 inet_release+0xb4/0x1b0 net/ipv4/af_inet.c:427
 inet6_release+0x46/0x60 net/ipv6/af_inet6.c:472
 __sock_release+0xc2/0x290 net/socket.c:579
 sock_close+0x10/0x20 net/socket.c:1140
 __fput+0x249/0x7f0 fs/file_table.c:278
 ____fput+0x9/0x10 fs/file_table.c:309
 task_work_run+0x108/0x180 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x1a9/0x200 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c8c9
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:00007febd46f0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: 0000000000000015 RBX: 00007febd46f16d4 RCX: 000000000045c8c9
RDX: 000000000000006e RSI: 0000000000000084 RDI: 0000000000000004
RBP: 000000000076bf00 R08: 0000000000000020 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000ade R14: 00000000004d71b8 R15: 000000000076bf0c
Modules linked in:
---[ end trace 59696fdd233c2b30 ]---
RIP: 0010:sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1538 [inline]
RIP: 0010:sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline]
RIP: 0010:sctp_do_sm+0x3a42/0x5040 net/sctp/sm_sideeffect.c:1170
Code: 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 74 08 3c 03 0f 8e d0 12 00 00 f6 83 b0 02 00 00 40 0f 85 7e e5 ff ff e9 a8 e5 ff ff <0f> 0b 49 8d 7d 12 48 89 fa 48 89 f9 48 c1 ea 03 83 e1 07 42 0f b6
RSP: 0018:ffff888091507958 EFLAGS: 00010246
RAX: ffff8880a7796bb0 RBX: ffff8880a77967c0 RCX: ffff8880a7796df0
RDX: 1ffff11014ef2d53 RSI: 0000000000000012 RDI: ffff8880a7796a98
RBP: ffff888091507c10 R08: ffff888091507b38 R09: ffff8880887357e8
R10: ffffed10110e4e08 R11: ffff888088727047 R12: 0000000000000000
R13: ffff888091507b78 R14: dffffc0000000000 R15: ffff888091507be8
FS:  00007febd46f1700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005587b1439970 CR3: 00000000a761f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400