syzbot


general protection fault in sock_hash_free

Status: fixed on 2020/07/17 17:58
Subsystems: net bpf
[Documentation on labels]
Fix commit: 75e68e5bf2c7 bpf, sockhash: Synchronize delete from bucket list on map free
First crash: 1453d, last: 1453d

Sample crash report:
general protection fault, probably for non-canonical address 0xfbd59c0000000024: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0xdead000000000120-0xdead000000000127]
CPU: 2 PID: 14305 Comm: kworker/2:3 Not tainted 5.7.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: events bpf_map_free_deferred
RIP: 0010:__write_once_size include/linux/compiler.h:279 [inline]
RIP: 0010:__hlist_del include/linux/list.h:811 [inline]
RIP: 0010:hlist_del_rcu include/linux/rculist.h:485 [inline]
RIP: 0010:sock_hash_free+0x202/0x4a0 net/core/sock_map.c:1021
Code: 0f 85 15 02 00 00 4c 8d 7b 28 4c 8b 63 20 4c 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 47 02 00 00 4c 8b 6b 28 4c 89 e8 48 c1 e8 03 <80> 3c 28 00 0f 85 25 02 00 00 4d 85 e4 4d 89 65 00 74 20 e8 f6 82
RSP: 0018:ffffc90000ba7c38 EFLAGS: 00010a06
RAX: 1bd5a00000000024 RBX: ffff88801d866700 RCX: ffffffff8636ae84
RDX: 0000000000000000 RSI: ffffffff8636afe9 RDI: ffff88801d866720
RBP: dffffc0000000000 R08: ffff888022765080 R09: fffffbfff185f952
R10: ffffffff8c2fca8f R11: fffffbfff185f951 R12: 0000000000000000
R13: dead000000000122 R14: dead000000000122 R15: ffff88801d866728
FS:  0000000000000000(0000) GS:ffff88802d000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f27551a9db8 CR3: 0000000056530000 CR4: 0000000000340ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bpf_map_free_deferred+0xb2/0x100 kernel/bpf/syscall.c:471
 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
Modules linked in:
---[ end trace da3ce2417ae8d343 ]---
RIP: 0010:__write_once_size include/linux/compiler.h:279 [inline]
RIP: 0010:__hlist_del include/linux/list.h:811 [inline]
RIP: 0010:hlist_del_rcu include/linux/rculist.h:485 [inline]
RIP: 0010:sock_hash_free+0x202/0x4a0 net/core/sock_map.c:1021
Code: 0f 85 15 02 00 00 4c 8d 7b 28 4c 8b 63 20 4c 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 47 02 00 00 4c 8b 6b 28 4c 89 e8 48 c1 e8 03 <80> 3c 28 00 0f 85 25 02 00 00 4d 85 e4 4d 89 65 00 74 20 e8 f6 82
RSP: 0018:ffffc90000ba7c38 EFLAGS: 00010a06
RAX: 1bd5a00000000024 RBX: ffff88801d866700 RCX: ffffffff8636ae84
RDX: 0000000000000000 RSI: ffffffff8636afe9 RDI: ffff88801d866720
RBP: dffffc0000000000 R08: ffff888022765080 R09: fffffbfff185f952
R10: ffffffff8c2fca8f R11: fffffbfff185f951 R12: 0000000000000000
R13: dead000000000122 R14: dead000000000122 R15: ffff88801d866728
FS:  0000000000000000(0000) GS:ffff88802d000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1e5e3c6290 CR3: 000000001347f000 CR4: 0000000000340ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/06/03 00:34 upstream 1ee08de1e234 f3ba1b5b .config console log report ci-qemu-upstream
* Struck through repros no longer work on HEAD.