bisecting fixing commit since 14cfdbd39e316efd91ae6e403ef8211f0b022603
building syzkaller on 68660b21c27c417771037b3f1fe4aa072cfdeef9
testing commit 14cfdbd39e316efd91ae6e403ef8211f0b022603 with gcc (GCC) 8.4.1 20210217
kernel signature: aabbae9dbb964b5cc3ef5cd8b8faaa5197aaab674424cf5774c181e1babad90a
run #0: crashed: kernel BUG in sctp_do_sm
run #1: crashed: kernel BUG in sctp_do_sm
run #2: crashed: kernel BUG in sctp_do_sm
run #3: crashed: kernel BUG in sctp_do_sm
run #4: crashed: kernel BUG in sctp_do_sm
run #5: crashed: kernel BUG in sctp_do_sm
run #6: crashed: kernel BUG in sctp_do_sm
run #7: crashed: kernel BUG in sctp_do_sm
run #8: crashed: kernel BUG in sctp_do_sm
run #9: crashed: kernel BUG in sctp_do_sm
run #10: crashed: kernel BUG in sctp_do_sm
run #11: crashed: kernel BUG in sctp_do_sm
run #12: crashed: kernel BUG in sctp_do_sm
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing current HEAD 255b58a2b3af0baa0ee11507390349217b8b73b0
testing commit 255b58a2b3af0baa0ee11507390349217b8b73b0 with gcc (GCC) 8.4.1 20210217
kernel signature: 01535fab64c2e40666e472dd482f2bb97dce18d7ff0b97503482d086364ec292
all runs: crashed: kernel BUG in sctp_do_sm
revisions tested: 2, total time: 28m39.289621937s (build: 15m28.760621677s, test: 12m10.497914955s)
the crash still happens on HEAD
commit msg: Linux 4.19.176
crash: kernel BUG in sctp_do_sm
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: 1 PID: 7472 Comm: syz-executor.4 Not tainted 4.19.176-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:ffff8881d2de76c8 EFLAGS: 00010246
RAX: ffff8881edadea30 RBX: ffff8881edade640 RCX: ffff8881edadec70
RDX: 1ffff1103db5bd23 RSI: 0000000000000012 RDI: ffff8881edade918
RBP: ffff8881d2de7980 R08: ffff8881d2de78a8 R09: ffff8881edd409e8
R10: ffffed103e82b6b0 R11: ffff8881f415b587 R12: 0000000000000000
R13: ffff8881d2de78e8 R14: dffffc0000000000 R15: ffff8881d2de7958
FS:  00007f3267493700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000053c000 CR3: 00000001d7860006 CR4: 00000000001606e0
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
 get_signal+0x13a8/0x19e0 kernel/signal.c:2400
 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:821
 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163
 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: 0033:0x4641a9
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:00007f3267493198 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: fffffffffffffe00 RBX: 0000000000000ade RCX: 00000000004641a9
RDX: 000000000000006e RSI: 0000000000000084 RDI: 0000000000000004
RBP: 0000000000000036 R08: 0000000000000020 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 000000000053bf00
R13: 00007f32674936bc R14: 00000000ffffffff R15: 0000000000000005
Modules linked in:
---[ end trace f4ee93d7a80f40db ]---
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:ffff8881d2de76c8 EFLAGS: 00010246
RAX: ffff8881edadea30 RBX: ffff8881edade640 RCX: ffff8881edadec70
RDX: 1ffff1103db5bd23 RSI: 0000000000000012 RDI: ffff8881edade918
RBP: ffff8881d2de7980 R08: ffff8881d2de78a8 R09: ffff8881edd409e8
R10: ffffed103e82b6b0 R11: ffff8881f415b587 R12: 0000000000000000
R13: ffff8881d2de78e8 R14: dffffc0000000000 R15: ffff8881d2de7958
FS:  00007f3267493700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000053c000 CR3: 00000001d7860006 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400