Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted 6.13.0-rc4-syzkaller-00054-gd6ef8b40d075 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:_compound_head include/linux/page-flags.h:242 [inline]
RIP: 0010:get_page include/linux/mm.h:1461 [inline]
RIP: 0010:__skb_frag_ref include/linux/skbuff_ref.h:20 [inline]
RIP: 0010:skb_frag_ref include/linux/skbuff_ref.h:32 [inline]
RIP: 0010:pskb_expand_head+0x8ac/0x1170 net/core/skbuff.c:2300
Code: 41 83 e7 01 4c 89 fe e8 e2 4d a1 f8 4d 85 ff 0f 85 c3 02 00 00 e8 64 4b a1 f8 e8 5f 4b a1 f8 48 8d 7d 08 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 28 07 00 00 4c 8b 7d 08 31 ff 4c 89 fb 83 e3
RSP: 0018:ffffc900005f8908 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff888025029680 RCX: ffffffff88f803de
RDX: ffff88801cefa440 RSI: ffffffff88f803f1 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000000002b R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000030 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88802b700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020789000 CR3: 000000004c1da000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__skb_unclone_keeptruesize+0x91/0x280 net/core/skbuff.c:2375
skb_unclone_keeptruesize include/linux/skbuff.h:1998 [inline]
__tcp_retransmit_skb.part.0+0xc58/0x2680 net/ipv4/tcp_output.c:3376
__tcp_retransmit_skb net/ipv4/tcp_output.c:3330 [inline]
tcp_send_loss_probe+0x454/0xb00 net/ipv4/tcp_output.c:2982
tcp_write_timer_handler net/ipv4/tcp_timer.c:710 [inline]
tcp_write_timer_handler+0x59d/0xa70 net/ipv4/tcp_timer.c:688
tcp_write_timer+0x157/0x2f0 net/ipv4/tcp_timer.c:735
call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1793
expire_timers kernel/time/timer.c:1844 [inline]
__run_timers+0x6e8/0x930 kernel/time/timer.c:2418
__run_timer_base kernel/time/timer.c:2430 [inline]
__run_timer_base kernel/time/timer.c:2422 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2439
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2449
handle_softirqs+0x213/0x8f0 kernel/softirq.c:561
__do_softirq kernel/softirq.c:595 [inline]
invoke_softirq kernel/softirq.c:435 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:662
irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline]
RIP: 0010:default_idle+0xf/0x20 arch/x86/kernel/process.c:743
Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 43 4f 2c 00 fb f4 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc9000049fe08 EFLAGS: 00000206
RAX: 00000000000aa59f RBX: 0000000000000003 RCX: ffffffff8b1a3819
RDX: 0000000000000000 RSI: ffffffff8b4cd280 RDI: ffffffff8bb17000
RBP: ffffed10039df488 R08: 0000000000000001 R09: ffffed10056e6fed
R10: ffff88802b737f6b R11: 0000000000000000 R12: 0000000000000003
R13: ffff88801cefa440 R14: ffffffff901ce3d0 R15: 0000000000000000
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x329/0x3f0 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
start_secondary+0x222/0x2b0 arch/x86/kernel/smpboot.c:314
common_startup_64+0x13e/0x148
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:_compound_head include/linux/page-flags.h:242 [inline]
RIP: 0010:get_page include/linux/mm.h:1461 [inline]
RIP: 0010:__skb_frag_ref include/linux/skbuff_ref.h:20 [inline]
RIP: 0010:skb_frag_ref include/linux/skbuff_ref.h:32 [inline]
RIP: 0010:pskb_expand_head+0x8ac/0x1170 net/core/skbuff.c:2300
Code: 41 83 e7 01 4c 89 fe e8 e2 4d a1 f8 4d 85 ff 0f 85 c3 02 00 00 e8 64 4b a1 f8 e8 5f 4b a1 f8 48 8d 7d 08 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 28 07 00 00 4c 8b 7d 08 31 ff 4c 89 fb 83 e3
RSP: 0018:ffffc900005f8908 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff888025029680 RCX: ffffffff88f803de
RDX: ffff88801cefa440 RSI: ffffffff88f803f1 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000000002b R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000030 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88802b700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020789000 CR3: 000000004c1da000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 41 83 e7 01 and $0x1,%r15d
4: 4c 89 fe mov %r15,%rsi
7: e8 e2 4d a1 f8 call 0xf8a14dee
c: 4d 85 ff test %r15,%r15
f: 0f 85 c3 02 00 00 jne 0x2d8
15: e8 64 4b a1 f8 call 0xf8a14b7e
1a: e8 5f 4b a1 f8 call 0xf8a14b7e
1f: 48 8d 7d 08 lea 0x8(%rbp),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 0f 85 28 07 00 00 jne 0x75d
35: 4c 8b 7d 08 mov 0x8(%rbp),%r15
39: 31 ff xor %edi,%edi
3b: 4c 89 fb mov %r15,%rbx
3e: 83 .byte 0x83
3f: e3 .byte 0xe3