syzbot

 sign-in | mailing list | source | docs
🐞 Open [1646]
≡ Subsystems
🐞 Fixed [6009]
🐞 Invalid [14804]
⬇ Missing Backports [135]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

KMSAN: uninit-value in netlink_rcv_skb (2)

Status: closed as invalid on 2020/07/22 14:12
Subsystems: net
[Documentation on labels]
First crash: 1656d, last: 1651d
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in netlink_rcv_skb (3) net 2 1651d 1651d 0/28 closed as invalid on 2020/07/27 08:13
upstream KMSAN: uninit-value in netlink_rcv_skb net C 43 2358d 2449d 0/28 closed as invalid on 2018/09/19 14:13

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in netlink_rcv_skb+0x359/0x650 net/netlink/af_netlink.c:2458
CPU: 1 PID: 8460 Comm: syz-executor915 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 netlink_rcv_skb+0x359/0x650 net/netlink/af_netlink.c:2458
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5478
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 kernel_sendmsg+0x433/0x440 net/socket.c:692
 sock_no_sendpage+0x235/0x300 net/core/sock.c:2853
 kernel_sendpage net/socket.c:3642 [inline]
 sock_sendpage+0x1e1/0x2c0 net/socket.c:945
 pipe_to_sendpage+0x38c/0x4c0 fs/splice.c:448
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x565/0xf00 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:834
 do_splice_from fs/splice.c:846 [inline]
 direct_splice_actor+0x1fd/0x580 fs/splice.c:1016
 splice_direct_to_actor+0x6b2/0xf50 fs/splice.c:971
 do_splice_direct+0x342/0x580 fs/splice.c:1059
 do_sendfile+0x101b/0x1d40 fs/read_write.c:1540
 __do_sys_sendfile64 fs/read_write.c:1601 [inline]
 __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1587
 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1587
 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4402b9
Code: Bad RIP value.
RSP: 002b:00007ffc772f6938 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007ffc772f6940 RCX: 00000000004402b9
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 65732f636f72702f R09: 65732f636f72702f
R10: 000000000000ddf5 R11: 0000000000000246 R12: 0000000000401b20
R13: 0000000000401bb0 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116
 _copy_from_iter_full+0xbfe/0x13b0 lib/iov_iter.c:793
 copy_from_iter_full include/linux/uio.h:156 [inline]
 memcpy_from_msg include/linux/skbuff.h:3566 [inline]
 netlink_sendmsg+0xfaa/0x14d0 net/netlink/af_netlink.c:1903
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 kernel_sendmsg+0x433/0x440 net/socket.c:692
 sock_no_sendpage+0x235/0x300 net/core/sock.c:2853
 kernel_sendpage net/socket.c:3642 [inline]
 sock_sendpage+0x1e1/0x2c0 net/socket.c:945
 pipe_to_sendpage+0x38c/0x4c0 fs/splice.c:448
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x565/0xf00 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:834
 do_splice_from fs/splice.c:846 [inline]
 direct_splice_actor+0x1fd/0x580 fs/splice.c:1016
 splice_direct_to_actor+0x6b2/0xf50 fs/splice.c:971
 do_splice_direct+0x342/0x580 fs/splice.c:1059
 do_sendfile+0x101b/0x1d40 fs/read_write.c:1540
 __do_sys_sendfile64 fs/read_write.c:1601 [inline]
 __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1587
 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1587
 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Uninit was created at:
 kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144
 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:269 [inline]
 kmsan_alloc_page+0xb9/0x180 mm/kmsan/kmsan_shadow.c:293
 __alloc_pages_nodemask+0x56a2/0x5dc0 mm/page_alloc.c:4889
 alloc_pages_current+0x672/0x990 mm/mempolicy.c:2292
 alloc_pages include/linux/gfp.h:545 [inline]
 push_pipe+0x605/0xb70 lib/iov_iter.c:537
 __pipe_get_pages lib/iov_iter.c:1278 [inline]
 pipe_get_pages_alloc lib/iov_iter.c:1385 [inline]
 iov_iter_get_pages_alloc+0x18a9/0x21c0 lib/iov_iter.c:1403
 default_file_splice_read fs/splice.c:385 [inline]
 do_splice_to+0x4fc/0x14f0 fs/splice.c:871
 splice_direct_to_actor+0x45c/0xf50 fs/splice.c:950
 do_splice_direct+0x342/0x580 fs/splice.c:1059
 do_sendfile+0x101b/0x1d40 fs/read_write.c:1540
 __do_sys_sendfile64 fs/read_write.c:1601 [inline]
 __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1587
 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1587
 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================

Crashes (642):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/07/20 06:42 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report syz C ci-upstream-kmsan-gce
2020/07/20 05:37 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report syz C ci-upstream-kmsan-gce
2020/07/22 14:05 https://github.com/google/kmsan.git master 91e18444d6b0 128cd85f .config console log report ci-upstream-kmsan-gce
2020/07/22 13:23 https://github.com/google/kmsan.git master 91e18444d6b0 128cd85f .config console log report ci-upstream-kmsan-gce
2020/07/22 09:17 https://github.com/google/kmsan.git master 91e18444d6b0 128cd85f .config console log report ci-upstream-kmsan-gce
2020/07/22 09:08 https://github.com/google/kmsan.git master 91e18444d6b0 128cd85f .config console log report ci-upstream-kmsan-gce
2020/07/22 08:01 https://github.com/google/kmsan.git master 91e18444d6b0 128cd85f .config console log report ci-upstream-kmsan-gce
2020/07/22 06:26 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/22 05:17 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/22 04:40 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/22 03:33 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/22 03:07 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/22 02:05 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/22 01:17 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/22 00:01 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/21 22:18 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/21 20:40 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/21 19:51 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/21 19:08 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/21 14:05 https://github.com/google/kmsan.git master 91e18444d6b0 d88894e6 .config console log report ci-upstream-kmsan-gce
2020/07/21 13:39 https://github.com/google/kmsan.git master 91e18444d6b0 d88894e6 .config console log report ci-upstream-kmsan-gce
2020/07/21 12:35 https://github.com/google/kmsan.git master 91e18444d6b0 d88894e6 .config console log report ci-upstream-kmsan-gce
2020/07/21 08:18 https://github.com/google/kmsan.git master 91e18444d6b0 d88894e6 .config console log report ci-upstream-kmsan-gce
2020/07/21 07:07 https://github.com/google/kmsan.git master 91e18444d6b0 d88894e6 .config console log report ci-upstream-kmsan-gce
2020/07/21 06:33 https://github.com/google/kmsan.git master 91e18444d6b0 d88894e6 .config console log report ci-upstream-kmsan-gce
2020/07/21 05:29 https://github.com/google/kmsan.git master 91e18444d6b0 d88894e6 .config console log report ci-upstream-kmsan-gce
2020/07/21 05:11 https://github.com/google/kmsan.git master 91e18444d6b0 d88894e6 .config console log report ci-upstream-kmsan-gce
2020/07/21 03:47 https://github.com/google/kmsan.git master 91e18444d6b0 d88894e6 .config console log report ci-upstream-kmsan-gce
2020/07/21 01:37 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/21 00:15 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 23:37 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 22:36 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 21:33 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 19:48 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 17:58 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 17:13 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 16:06 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 16:01 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 14:41 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 13:33 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 12:12 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/20 11:10 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/20 10:18 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/17 18:11 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.