syzbot


KCSAN: data-race in pcpu_alloc / pcpu_free_area (3)

Status: moderation: reported syz repro on 2021/11/29 17:24
Subsystems: netfilter
[Documentation on labels]
Reported-by: syzbot+041c26cb85794b7e414d@syzkaller.appspotmail.com
First crash: 1024d, last: 7h31m
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in pcpu_alloc / pcpu_free_area (2) netfilter 574 1025d 1603d 0/26 closed as invalid on 2021/06/07 13:54
upstream KCSAN: data-race in pcpu_alloc / pcpu_free_area netfilter 2 1628d 1637d 0/26 closed as invalid on 2019/10/15 15:50

Sample crash report:
==================================================================
BUG: KCSAN: data-race in pcpu_alloc / pcpu_free_area

read-write to 0xffffffff86ef831c of 4 bytes by task 3104 on cpu 0:
 pcpu_update_empty_pages mm/percpu.c:602 [inline]
 pcpu_block_update_hint_free mm/percpu.c:1044 [inline]
 pcpu_free_area+0x4e2/0x570 mm/percpu.c:1302
 free_percpu+0x1c6/0xb20 mm/percpu.c:2303
 xt_percpu_counter_free+0x63/0x70 net/netfilter/x_tables.c:1950
 cleanup_entry+0x17b/0x1a0 net/ipv4/netfilter/ip_tables.c:654
 __do_replace+0x46a/0x570 net/ipv4/netfilter/ip_tables.c:1082
 do_replace net/ipv4/netfilter/ip_tables.c:1137 [inline]
 do_ipt_set_ctl+0x1440/0x1730 net/ipv4/netfilter/ip_tables.c:1627
 nf_setsockopt+0x18d/0x1b0 net/netfilter/nf_sockopt.c:101
 ip_setsockopt+0xe6/0x100 net/ipv4/ip_sockglue.c:1426
 tcp_setsockopt+0x90/0xa0 net/ipv4/tcp.c:3704
 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3711
 do_sock_setsockopt net/socket.c:2311 [inline]
 __sys_setsockopt+0x1d4/0x240 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __x64_sys_setsockopt+0x66/0x80 net/socket.c:2340
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffffffff86ef831c of 4 bytes by task 3111 on cpu 1:
 pcpu_alloc+0x9bc/0x10b0 mm/percpu.c:1868
 __alloc_percpu+0x24/0x30 mm/percpu.c:1943
 xt_percpu_counter_alloc+0x72/0x110 net/netfilter/x_tables.c:1930
 find_check_entry net/ipv4/netfilter/ip_tables.c:526 [inline]
 translate_table+0x90b/0xf60 net/ipv4/netfilter/ip_tables.c:716
 do_replace net/ipv4/netfilter/ip_tables.c:1133 [inline]
 do_ipt_set_ctl+0x13f0/0x1730 net/ipv4/netfilter/ip_tables.c:1627
 nf_setsockopt+0x18d/0x1b0 net/netfilter/nf_sockopt.c:101
 ip_setsockopt+0xe6/0x100 net/ipv4/ip_sockglue.c:1426
 tcp_setsockopt+0x90/0xa0 net/ipv4/tcp.c:3704
 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3711
 do_sock_setsockopt net/socket.c:2311 [inline]
 __sys_setsockopt+0x1d4/0x240 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __x64_sys_setsockopt+0x66/0x80 net/socket.c:2340
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000005 -> 0x00000006

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3111 Comm: syz-executor.2 Not tainted 6.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
==================================================================

Crashes (1309):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/12/04 08:36 upstream 33cc938e65a9 f819d6f7 .config console log report syz [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2023/12/04 00:57 upstream 33cc938e65a9 f819d6f7 .config console log report syz [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2023/09/13 21:15 upstream 3669558bdf35 0b6a67ac .config console log report syz [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2023/08/25 07:34 upstream 4f9e7fabf864 49be837e .config console log report syz [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2022/05/21 17:04 upstream 3b5e1590a267 7268fa62 .config console log report syz ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/28 16:06 upstream 8d025e2092e2 e91187ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/28 08:20 upstream 8d025e2092e2 120789fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/27 17:52 upstream 498e47cd1d1f 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/26 23:37 upstream 7033999ecd7b 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/26 19:20 upstream 928a87efa423 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/26 01:55 upstream 928a87efa423 bcd9b39f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/25 11:03 upstream 4cece7649650 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/25 10:02 upstream 4cece7649650 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/24 07:33 upstream 70293240c5ce 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/23 19:38 upstream 484193fecd2b 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/23 04:44 upstream bfa8f18691ed 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/23 02:14 upstream bfa8f18691ed 4b6cdce6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/22 12:27 upstream 8e938e398669 4b6cdce6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/22 08:07 upstream 8e938e398669 7a239ce7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/21 19:27 upstream ebc9bee8814d 7a239ce7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/21 05:32 upstream dba89d1b81df 6753db5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/21 00:29 upstream dba89d1b81df 5b7d42ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/20 03:51 upstream a4145ce1e7bc a485f239 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/19 13:20 upstream b3603fcb79b1 e104824c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/19 02:18 upstream b3603fcb79b1 baa80228 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/17 20:07 upstream 906a93befec8 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/17 04:09 upstream 741e9d668aa5 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/16 02:11 upstream 82affc97affb d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/14 21:48 upstream fe46a7dd189e 8d8ee116 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/14 08:28 upstream 480e035fc4c7 8d8ee116 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/14 07:27 upstream 480e035fc4c7 f919f202 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/13 01:36 upstream 1f440397665f c35c26ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/12 12:11 upstream 855684c7d938 c35c26ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/11 23:11 upstream 045395d86acd 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/10 20:49 upstream fa4b851b4ad6 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/08 02:56 upstream 3aaa8ce7a335 cf82cde1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/07 18:14 upstream 135288b73cef 2b789849 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/07 01:29 upstream 67be068d31d4 f39a7eed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/06 11:47 upstream 5847c9777c30 f39a7eed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/05 14:08 upstream 90d35da658da f39a7eed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/05 00:45 upstream 90d35da658da 5fc53669 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/04 12:29 upstream 90d35da658da 3717835d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/04 07:53 upstream 90d35da658da 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/03 18:31 upstream 58c806d867bf 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/03 05:11 upstream 04b8076df253 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/02 15:34 upstream 5ad3cb0ed525 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/03/01 02:58 upstream 87adedeba51a 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/02/29 13:17 upstream 805d849d7c3c 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/02/29 00:02 upstream e326df53af00 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/02/28 12:14 upstream cf1182944c7c 55d6f11d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/02/28 01:55 upstream cf1182944c7c d367cbe5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/02/27 19:02 upstream 45ec2f5f6ed3 d367cbe5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/02/26 15:23 upstream d206a76d7d27 da36a36b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2024/02/26 11:19 upstream d206a76d7d27 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2021/11/29 14:18 upstream d58071a8a76d 63eeac02 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2021/11/28 23:18 upstream d06c942efea4 63eeac02 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
2021/06/08 01:37 upstream 614124bea77e b718257f .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in pcpu_alloc / pcpu_free_area
* Struck through repros no longer work on HEAD.