syzbot


general protection fault in tcf_generic_walker

Status: auto-closed as invalid on 2022/03/25 04:45
Reported-by: syzbot+4b03bb1f2a1c4dfbd97a@syzkaller.appspotmail.com
First crash: 312d, last: 312d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in tcf_generic_walker syz 9 733d 735d 17/24 fixed on 2020/11/16 12:12

Sample crash report:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 16225 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:tcf_dump_walker net/sched/act_api.c:212 [inline]
RIP: 0010:tcf_generic_walker+0x33e/0xa20 net/sched/act_api.c:294
Code: 24 31 ff 48 89 de e8 71 44 d6 fa 48 85 db 74 3f e8 d7 42 d6 fa 48 8d 7d 30 48 ba 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 10 00 0f 85 d5 05 00 00 48 8b 5d 30 31 ff 48 2b 1c 24 48 89
RSP: 0018:ffff8880a1a874d8 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 0000000100019b74 RCX: ffffc9000c50c000
RDX: dffffc0000000000 RSI: ffffffff868c4299 RDI: 0000000000000020
RBP: fffffffffffffff0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: ffff8880ae899500
R13: 000000000000002b R14: 000000000000002a R15: 0000000000000000
FS:  00007f5ac82e2700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d725000 CR3: 00000000b3c15000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tc_dump_action+0x6b0/0xdb0 net/sched/act_api.c:1476
 netlink_dump+0x3cf/0xc10 net/netlink/af_netlink.c:2242
 __netlink_dump_start+0x4e9/0x6f0 net/netlink/af_netlink.c:2338
 netlink_dump_start include/linux/netlink.h:213 [inline]
 rtnetlink_rcv_msg+0x71e/0xb80 net/core/rtnetlink.c:4745
 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463
 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline]
 netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351
 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:661
 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227
 __sys_sendmsg net/socket.c:2265 [inline]
 __do_sys_sendmsg net/socket.c:2274 [inline]
 __se_sys_sendmsg net/socket.c:2272 [inline]
 __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f5acad8dae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5ac82e2188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f5acaea1020 RCX: 00007f5acad8dae9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000003
RBP: 00007f5acade7f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffea59f5eaf R14: 00007f5ac82e2300 R15: 0000000000022000
Modules linked in:
---[ end trace 6905ab48d5a18c71 ]---
RIP: 0010:tcf_dump_walker net/sched/act_api.c:212 [inline]
RIP: 0010:tcf_generic_walker+0x33e/0xa20 net/sched/act_api.c:294
Code: 24 31 ff 48 89 de e8 71 44 d6 fa 48 85 db 74 3f e8 d7 42 d6 fa 48 8d 7d 30 48 ba 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 10 00 0f 85 d5 05 00 00 48 8b 5d 30 31 ff 48 2b 1c 24 48 89
RSP: 0018:ffff8880a1a874d8 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 0000000100019b74 RCX: ffffc9000c50c000
RDX: dffffc0000000000 RSI: ffffffff868c4299 RDI: 0000000000000020
RBP: fffffffffffffff0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: ffff8880ae899500
R13: 000000000000002b R14: 000000000000002a R15: 0000000000000000
FS:  00007f5ac82e2700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d725000 CR3: 00000000b3c15000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	31 ff                	xor    %edi,%edi
   2:	48 89 de             	mov    %rbx,%rsi
   5:	e8 71 44 d6 fa       	callq  0xfad6447b
   a:	48 85 db             	test   %rbx,%rbx
   d:	74 3f                	je     0x4e
   f:	e8 d7 42 d6 fa       	callq  0xfad642eb
  14:	48 8d 7d 30          	lea    0x30(%rbp),%rdi
  18:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  1f:	fc ff df
  22:	48 89 f8             	mov    %rdi,%rax
  25:	48 c1 e8 03          	shr    $0x3,%rax
* 29:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1) <-- trapping instruction
  2d:	0f 85 d5 05 00 00    	jne    0x608
  33:	48 8b 5d 30          	mov    0x30(%rbp),%rbx
  37:	31 ff                	xor    %edi,%edi
  39:	48 2b 1c 24          	sub    (%rsp),%rbx
  3d:	48                   	rex.W
  3e:	89                   	.byte 0x89

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-19 2021/11/25 04:44 linux-4.19.y 3f8a27f9e27b 545ab074 .config log report info general protection fault in tcf_generic_walker
* Struck through repros no longer work on HEAD.