------------[ cut here ]------------
sk->sk_forward_alloc
WARNING: net/ipv4/af_inet.c:157 at inet_sock_destruct+0x653/0x800 net/ipv4/af_inet.c:157, CPU#2: syz-executor/5940
Modules linked in:
CPU: 2 UID: 0 PID: 5940 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:inet_sock_destruct+0x653/0x800 net/ipv4/af_inet.c:157
Code: c9 4e ff e9 06 fd ff ff e8 2a af 01 f8 90 0f 0b 90 e9 35 fe ff ff e8 1c af 01 f8 90 0f 0b 90 e9 c5 fe ff ff e8 0e af 01 f8 90 <0f> 0b 90 e9 04 ff ff ff e8 00 af 01 f8 90 0f 0b 90 e9 65 fe ff ff
RSP: 0018:ffffc90000648d98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88805834ee80 RCX: ffffffff8a06e8b7
RDX: ffff88802f654900 RSI: ffffffff8a06e9b2 RDI: ffff88802f654900
RBP: 0000000000000090 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000090 R11: 0000000000000000 R12: ffff88805834ee80
R13: ffff88805834ef10 R14: ffffffff81ee5bad R15: 0000000000000005
FS: 0000555573b93500(0000) GS:ffff8880d6552000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe21c72fc0 CR3: 000000003de49000 CR4: 0000000000352ef0
Call Trace:
__sk_destruct+0x85/0xbb0 net/core/sock.c:2350
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2869
handle_softirqs+0x1eb/0x9e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xef/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:on_sig_stack include/linux/sched/signal.h:598 [inline]
RIP: 0010:do_sigaltstack.constprop.0+0x23d/0x670 kernel/signal.c:4407
Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 56 03 00 00 44 8b b3 98 09 00 00 31 ff 44 89 f6 6e e0 3d 00 45 85 f6 78 42 e8 b4 e5 3d 00 48 8d bb 88 09 00 00
RSP: 0018:ffffc90005807d78 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88802f654900 RCX: ffffffff81ccab05
RDX: 1ffff11005ecaa53 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 00007ffe21c72c00 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc90005807de8 R14: 0000000000000002 R15: 0000000000000002
restore_altstack+0x10d/0x170 kernel/signal.c:4463
__do_sys_rt_sigreturn+0x1ab/0x2c0 arch/x86/kernel/signal_64.c:265
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f12daf3d399
Code: 11 06 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 0c 25
RSP: 002b:00007ffe21c72c00 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 0000555573b93500 RCX: 00007f12daf3d399
RDX: 00007ffe21c72c00 RSI: 00007ffe21c72d30 RDI: 0000000000000011
RBP: 00007ffe21c739ac R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000001388
R13: 00000000000927c0 R14: 000000000001559c R15: 00007ffe21c73a00
----------------
Code disassembly (best guess):
0: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
7: fc ff df
a: 48 c1 ea 03 shr $0x3,%rdx
e: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax
12: 84 c0 test %al,%al
14: 74 08 je 0x1e
16: 3c 03 cmp $0x3,%al
18: 0f 8e 56 03 00 00 jle 0x374
1e: 44 8b b3 98 09 00 00 mov 0x998(%rbx),%r14d
25: 31 ff xor %edi,%edi
27: 44 89 f6 mov %r14d,%esi
* 2a: e8 6e e0 3d 00 call 0x3de09d <-- trapping instruction
2f: 45 85 f6 test %r14d,%r14d
32: 78 42 js 0x76
34: e8 b4 e5 3d 00 call 0x3de5ed
39: 48 8d bb 88 09 00 00 lea 0x988(%rbx),%rdi