------------[ cut here ]------------
skb_is_nonlinear(skb)
WARNING: ./include/linux/skbuff.h:3325 at skb_trim+0x112/0x1a0, CPU#0: syz.3.6729/22735
Modules linked in:
CPU: 0 UID: 0 PID: 22735 Comm: syz.3.6729 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:skb_trim+0x112/0x1a0
Code: 04 28 84 c0 0f 85 81 00 00 00 41 89 1e eb 05 e8 04 8c 2b f8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 ef 8b 2b f8 90 <0f> 0b 90 eb e5 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 12 ff ff ff
RSP: 0018:ffffc900045ef018 EFLAGS: 00010283
RAX: ffffffff899b88f1 RBX: 0000000000000944 RCX: 0000000000080000
RDX: ffffc900232cd000 RSI: 00000000000036e9 RDI: 00000000000036ea
RBP: 000000000000ee4a R08: ffff888021d19ee3 R09: 1ffff110043a33dc
R10: dffffc0000000000 R11: ffffed10043a33dd R12: ffff8880215dbcf4
R13: dffffc0000000000 R14: ffff8880215dbc80 R15: 1ffff110042bb79e
FS:  00007f2b081f66c0(0000) GS:ffff88818d94b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000001a000 CR3: 000000002134e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 sctp_ulpevent_make_rcvmsg+0x3bd/0x970
 sctp_ulpq_tail_data+0xd1/0xed0
 sctp_do_sm+0x1ac0/0x5d50
 sctp_assoc_bh_rcv+0x3f2/0x630
 sctp_backlog_rcv+0x15c/0x370
 __release_sock+0x28b/0x390
 release_sock+0x190/0x260
 sctp_sendmsg+0x1c09/0x2d00
 sock_sendmsg_nosec+0x10e/0x180
 ____sys_sendmsg+0x54e/0x850
 ___sys_sendmsg+0x2a5/0x360
 __sys_sendmmsg+0x273/0x4d0
 __x64_sys_sendmmsg+0xa0/0xc0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2b09f9e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2b081f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f2b0a225fa0 RCX: 00007f2b09f9e019
RDX: 0000000000000001 RSI: 0000200000003f00 RDI: 0000000000000003
RBP: 00007f2b0a03500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2b0a226038 R14: 00007f2b0a225fa0 R15: 00007fff8f15db88
 </TASK>
