syzbot


general protection fault in inet_unhash

Status: auto-obsoleted due to no activity on 2023/11/26 22:36
Reported-by: syzbot+b8f203173a7bcfa2b70b@syzkaller.appspotmail.com
First crash: 322d, last: 245d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: unable to handle kernel paging request in inet_unhash net 3 516d 597d 22/26 fixed on 2023/02/24 13:50
upstream general protection fault in inet_unhash net C done 40 1393d 1422d 15/26 fixed on 2020/07/17 17:58

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.1.31-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
RIP: 0010:inet_ehash_lockp include/net/inet_hashtables.h:209 [inline]
RIP: 0010:inet_unhash+0x1ec/0x870 net/ipv4/inet_hashtables.c:793
Code: 5f 5d c3 49 8d 6c 24 08 48 89 e8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 38 05 00 00 8b 6d 00 48 8d 7b 08 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 74 05 e8 58 79 d8 f8 48 8b 7b 08 48 83 c3 14 48 89
RSP: 0018:ffffc900001b77b8 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff8880126b9dc0
RDX: ffff8880126b9dc0 RSI: 0000000000000004 RDI: 0000000000000008
RBP: 0000000012174fb1 R08: ffffffff8907a254 R09: ffffffff8909770d
R10: 0000000000000002 R11: ffff8880126b9dc0 R12: ffff88807699b000
R13: ffff88807699b028 R14: dffffc0000000000 R15: ffff88807699b070
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020250000 CR3: 000000007d627000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tcp_set_state+0x3d9/0x770 net/ipv4/tcp.c:2748
 tcp_done+0x103/0x320 net/ipv4/tcp.c:4645
 tcp_out_of_resources+0x1f2/0x390 net/ipv4/tcp_timer.c:132
 tcp_probe_timer net/ipv4/tcp_timer.c:385 [inline]
 tcp_write_timer_handler+0x58a/0x930 net/ipv4/tcp_timer.c:624
 tcp_write_timer+0x12e/0x280 net/ipv4/tcp_timer.c:637
 call_timer_fn+0x19e/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers+0x67c/0x890 kernel/time/timer.c:1790
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1803
 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571
 run_ksoftirqd+0xc1/0x120 kernel/softirq.c:934
 smpboot_thread_fn+0x51b/0xa10 kernel/smpboot.c:164
 kthread+0x26e/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:inet_ehash_lockp include/net/inet_hashtables.h:209 [inline]
RIP: 0010:inet_unhash+0x1ec/0x870 net/ipv4/inet_hashtables.c:793
Code: 5f 5d c3 49 8d 6c 24 08 48 89 e8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 38 05 00 00 8b 6d 00 48 8d 7b 08 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 74 05 e8 58 79 d8 f8 48 8b 7b 08 48 83 c3 14 48 89
RSP: 0018:ffffc900001b77b8 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff8880126b9dc0
RDX: ffff8880126b9dc0 RSI: 0000000000000004 RDI: 0000000000000008
RBP: 0000000012174fb1 R08: ffffffff8907a254 R09: ffffffff8909770d
R10: 0000000000000002 R11: ffff8880126b9dc0 R12: ffff88807699b000
R13: ffff88807699b028 R14: dffffc0000000000 R15: ffff88807699b070
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020250000 CR3: 000000007d627000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	5f                   	pop    %rdi
   1:	5d                   	pop    %rbp
   2:	c3                   	retq
   3:	49 8d 6c 24 08       	lea    0x8(%r12),%rbp
   8:	48 89 e8             	mov    %rbp,%rax
   b:	48 c1 e8 03          	shr    $0x3,%rax
   f:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax
  14:	84 c0                	test   %al,%al
  16:	0f 85 38 05 00 00    	jne    0x554
  1c:	8b 6d 00             	mov    0x0(%rbp),%ebp
  1f:	48 8d 7b 08          	lea    0x8(%rbx),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f:	74 05                	je     0x36
  31:	e8 58 79 d8 f8       	callq  0xf8d8798e
  36:	48 8b 7b 08          	mov    0x8(%rbx),%rdi
  3a:	48 83 c3 14          	add    $0x14,%rbx
  3e:	48                   	rex.W
  3f:	89                   	.byte 0x89

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/02 13:08 linux-6.1.y d2869ace6eeb a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in inet_unhash
2023/08/18 22:35 linux-6.1.y 6c44e13dc284 d216d8a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in inet_unhash
* Struck through repros no longer work on HEAD.