syzbot


general protection fault in free_percpu

Status: auto-obsoleted due to no activity on 2023/10/08 15:48
Reported-by: syzbot+2429c2ad1a95017ece23@syzkaller.appspotmail.com
First crash: 227d, last: 227d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-54 general protection fault in free_percpu C 2 1137d 1137d 0/2 auto-obsoleted due to no activity on 2023/04/17 16:54
upstream general protection fault in free_percpu net syz unreliable done 80 783d 1050d 20/26 fixed on 2022/03/08 16:11
upstream general protection fault in free_percpu (2) wireless 1 405d 405d 22/26 fixed on 2023/06/08 14:41

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 0 PID: 15851 Comm: syz-executor.4 Not tainted 6.1.25-syzkaller-00010-g0a2e9dd65c6b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
RIP: 0010:pcpu_get_page_chunk mm/percpu.c:266 [inline]
RIP: 0010:pcpu_chunk_addr_search mm/percpu.c:1622 [inline]
RIP: 0010:free_percpu+0x253/0x10f0 mm/percpu.c:2279
Code: e8 03 42 80 3c 38 00 74 08 48 89 df e8 86 34 10 00 48 8b 3b 4c 01 ef e8 eb a3 09 00 48 89 c3 48 83 c3 20 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 5e 34 10 00 4c 8b 23 4d 8d 74 24
RSP: 0018:ffffc9000a7a7220 EFLAGS: 00010002
RAX: 0000000000000004 RBX: 0000000000000020 RCX: 0000000000040000
RDX: ffffc90003161000 RSI: 000000000000c578 RDI: 000000000000c579
RBP: ffffc9000a7a7308 R08: ffffffff81b47374 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff88823fed3b40
R13: ffffe8fffe600000 R14: ffff8881f703a7a8 R15: dffffc0000000000
FS:  00007f6669756700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020b64000 CR3: 0000000156710000 CR4: 00000000003506b0
Call Trace:
 <TASK>
 macsec_free_netdev+0x7a/0x140 drivers/net/macsec.c:3718
 netdev_run_todo+0xb43/0xd00 net/core/dev.c:10372
 rtnl_unlock net/core/rtnetlink.c:147 [inline]
 rtnetlink_rcv_msg+0x9f4/0xca0 net/core/rtnetlink.c:6092
 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2553
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6109
 netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline]
 netlink_unicast+0x8ee/0xad0 net/netlink/af_netlink.c:1354
 netlink_sendmsg+0xa15/0xd30 net/netlink/af_netlink.c:1931
 sock_sendmsg_nosec net/socket.c:716 [inline]
 sock_sendmsg net/socket.c:736 [inline]
 ____sys_sendmsg+0x5dc/0x9d0 net/socket.c:2482
 ___sys_sendmsg net/socket.c:2536 [inline]
 __sys_sendmsg+0x2a9/0x390 net/socket.c:2565
 __do_sys_sendmsg net/socket.c:2574 [inline]
 __se_sys_sendmsg net/socket.c:2572 [inline]
 __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2572
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f6668a8c389
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6669756168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f6668babf80 RCX: 00007f6668a8c389
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00007f6668ad7493 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffe667da4f R14: 00007f6669756300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:pcpu_get_page_chunk mm/percpu.c:266 [inline]
RIP: 0010:pcpu_chunk_addr_search mm/percpu.c:1622 [inline]
RIP: 0010:free_percpu+0x253/0x10f0 mm/percpu.c:2279
Code: e8 03 42 80 3c 38 00 74 08 48 89 df e8 86 34 10 00 48 8b 3b 4c 01 ef e8 eb a3 09 00 48 89 c3 48 83 c3 20 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 5e 34 10 00 4c 8b 23 4d 8d 74 24
RSP: 0018:ffffc9000a7a7220 EFLAGS: 00010002
RAX: 0000000000000004 RBX: 0000000000000020 RCX: 0000000000040000
RDX: ffffc90003161000 RSI: 000000000000c578 RDI: 000000000000c579
RBP: ffffc9000a7a7308 R08: ffffffff81b47374 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff88823fed3b40
R13: ffffe8fffe600000 R14: ffff8881f703a7a8 R15: dffffc0000000000
FS:  00007f6669756700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020b64000 CR3: 0000000156710000 CR4: 00000000003506b0
----------------
Code disassembly (best guess):
   0:	e8 03 42 80 3c       	callq  0x3c804208
   5:	38 00                	cmp    %al,(%rax)
   7:	74 08                	je     0x11
   9:	48 89 df             	mov    %rbx,%rdi
   c:	e8 86 34 10 00       	callq  0x103497
  11:	48 8b 3b             	mov    (%rbx),%rdi
  14:	4c 01 ef             	add    %r13,%rdi
  17:	e8 eb a3 09 00       	callq  0x9a407
  1c:	48 89 c3             	mov    %rax,%rbx
  1f:	48 83 c3 20          	add    $0x20,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 5e 34 10 00       	callq  0x103497
  39:	4c 8b 23             	mov    (%rbx),%r12
  3c:	4d                   	rex.WRB
  3d:	8d                   	.byte 0x8d
  3e:	74 24                	je     0x64

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/07/10 15:40 android14-6.1 0a2e9dd65c6b d47e94ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in free_percpu
* Struck through repros no longer work on HEAD.