syzbot


kernel BUG in inet_sock_destruct

Status: fixed on 2023/06/08 14:41
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+bebc6f1acdf4cbb79b03@syzkaller.appspotmail.com
Fix commit: 1ac885574470 inet: control sockets should not use current thread task_frag
First crash: 528d, last: 526d
Cause bisection: failed (error log, bisect log)
  
Discussions (2)
Title Replies (including bot) Last reply
[PATCH net] inet: control sockets should not use current thread task_frag 3 (3) 2023/01/05 04:44
[syzbot] kernel BUG in inet_sock_destruct 0 (1) 2023/01/03 19:24

Sample crash report:
 kfree_skb include/linux/skbuff.h:1218 [inline]
 __skb_queue_purge include/linux/skbuff.h:3112 [inline]
 inet_sock_destruct+0x10f/0x890 net/ipv4/af_inet.c:136
 __sk_destruct+0x4d/0x750 net/core/sock.c:2133
 rcu_do_batch kernel/rcu/tree.c:2246 [inline]
 rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2506
 __do_softirq+0x1fb/0xadc kernel/softirq.c:571
------------[ cut here ]------------
kernel BUG at include/linux/mm.h:760!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 5072 Comm: syz-executor406 Not tainted 6.1.0-syzkaller-04343-gd039535850ee #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:put_page_testzero include/linux/mm.h:760 [inline]
RIP: 0010:folio_put_testzero include/linux/mm.h:766 [inline]
RIP: 0010:folio_put include/linux/mm.h:1249 [inline]
RIP: 0010:put_page include/linux/mm.h:1319 [inline]
RIP: 0010:__skb_frag_unref include/linux/skbuff.h:3388 [inline]
RIP: 0010:skb_release_data+0x73c/0x870 net/core/skbuff.c:845
Code: fd ff ff e8 b6 42 bf f9 48 8b 6c 24 10 48 83 ed 01 e9 62 fd ff ff e8 a3 42 bf f9 48 c7 c6 20 e0 5a 8b 48 89 ef e8 54 ed f6 f9 <0f> 0b 4c 89 e7 e8 ea 43 0d fa e9 29 f9 ff ff 48 8b 7c 24 08 e8 3b
RSP: 0018:ffffc900001e0d30 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88807d4adb40 RCX: 0000000000000100
RDX: ffff888021990000 RSI: ffffffff87c20f4c RDI: 0000000000000000
RBP: ffffea0000810600 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0000810634
R13: ffff88807023b4f0 R14: 0000000000000000 R15: dffffc0000000000
FS:  00005555568ca300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feda96e73a0 CR3: 00000000205ab000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 skb_release_all net/core/skbuff.c:916 [inline]
 __kfree_skb net/core/skbuff.c:930 [inline]
 kfree_skb_reason+0x1ab/0x4f0 net/core/skbuff.c:956
 kfree_skb include/linux/skbuff.h:1218 [inline]
 __skb_queue_purge include/linux/skbuff.h:3112 [inline]
 inet_sock_destruct+0x10f/0x890 net/ipv4/af_inet.c:136
 __sk_destruct+0x4d/0x750 net/core/sock.c:2133
 rcu_do_batch kernel/rcu/tree.c:2246 [inline]
 rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2506
 __do_softirq+0x1fb/0xadc kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1107
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x3c/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 46 e6 5a f7 48 89 ef e8 ee 52 5b f7 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 2f b6 4d f7 65 8b 05 e0 a2 fa 75 85 c0 74 0a 5b 5d c3 e8 ec ca
RSP: 0018:ffffc90003adfc78 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff1ce5581
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff888020b921e0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffed100417243c R11: 0000000000000000 R12: dffffc0000000000
R13: 00007ffea9da3db4 R14: 0000000000000004 R15: 0000000000000000
 do_wait+0x17f/0xd70 kernel/exit.c:1579
 kernel_wait4+0x150/0x260 kernel/exit.c:1766
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1794
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7feda969c0e6
Code: 0f 1f 40 00 31 c9 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 49 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 90 48 83 ec 28 89 54 24 14 48 89 74 24
RSP: 002b:00007ffea9da3da8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00007ffea9da3dd0 RCX: 00007feda969c0e6
RDX: 0000000040000001 RSI: 00007ffea9da3db4 RDI: 00000000ffffffff
RBP: 000000000000032b R08: 0000000000000070 R09: 00007ffea9dee080
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffea9da3dc0
R13: 00000000000f4240 R14: 000000000001b5dc R15: 00007ffea9da3db4
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:put_page_testzero include/linux/mm.h:760 [inline]
RIP: 0010:folio_put_testzero include/linux/mm.h:766 [inline]
RIP: 0010:folio_put include/linux/mm.h:1249 [inline]
RIP: 0010:put_page include/linux/mm.h:1319 [inline]
RIP: 0010:__skb_frag_unref include/linux/skbuff.h:3388 [inline]
RIP: 0010:skb_release_data+0x73c/0x870 net/core/skbuff.c:845
Code: fd ff ff e8 b6 42 bf f9 48 8b 6c 24 10 48 83 ed 01 e9 62 fd ff ff e8 a3 42 bf f9 48 c7 c6 20 e0 5a 8b 48 89 ef e8 54 ed f6 f9 <0f> 0b 4c 89 e7 e8 ea 43 0d fa e9 29 f9 ff ff 48 8b 7c 24 08 e8 3b
RSP: 0018:ffffc900001e0d30 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88807d4adb40 RCX: 0000000000000100
RDX: ffff888021990000 RSI: ffffffff87c20f4c RDI: 0000000000000000
RBP: ffffea0000810600 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0000810634
R13: ffff88807023b4f0 R14: 0000000000000000 R15: dffffc0000000000
FS:  00005555568ca300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feda96e73a0 CR3: 00000000205ab000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	74 24                	je     0x26
   2:	10 e8                	adc    %ch,%al
   4:	46 e6 5a             	rex.RX out %al,$0x5a
   7:	f7 48 89 ef e8 ee 52 	testl  $0x52eee8ef,-0x77(%rax)
   e:	5b                   	pop    %rbx
   f:	f7 81 e3 00 02 00 00 	testl  $0x9c257500,0x200e3(%rcx)
  16:	75 25 9c
  19:	58                   	pop    %rax
  1a:	f6 c4 02             	test   $0x2,%ah
  1d:	75 2d                	jne    0x4c
  1f:	48 85 db             	test   %rbx,%rbx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 2f b6 4d f7       	callq  0xf74db65e <-- trapping instruction
  2f:	65 8b 05 e0 a2 fa 75 	mov    %gs:0x75faa2e0(%rip),%eax        # 0x75faa316
  36:	85 c0                	test   %eax,%eax
  38:	74 0a                	je     0x44
  3a:	5b                   	pop    %rbx
  3b:	5d                   	pop    %rbp
  3c:	c3                   	retq
  3d:	e8                   	.byte 0xe8
  3e:	ec                   	in     (%dx),%al
  3f:	ca                   	.byte 0xca

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/01 11:55 net-old d039535850ee ab32d508 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce kernel BUG in inet_sock_destruct
2023/01/01 07:21 net-next-old c183e6c3ec34 ab32d508 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce kernel BUG in inet_sock_destruct
2023/01/03 05:16 net-next-old c183e6c3ec34 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce kernel BUG in inet_sock_destruct
* Struck through repros no longer work on HEAD.