Messages in this thread | | | Date | Thu, 07 Nov 2019 10:55:09 -0800 | Subject | KCSAN: data-race in netlink_recvmsg / netlink_recvmsg | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 94c00660 x86, kcsan: Enable KCSAN for x86 git tree: https://github.com/google/ktsan.git kcsan console output: https://syzkaller.appspot.com/x/log.txt?x=14426768e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=51a7c7d2972c87e5 dashboard link: https://syzkaller.appspot.com/bug?extid=6dedf50d68e5713a1f65 compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+6dedf50d68e5713a1f65@syzkaller.appspotmail.com
================================================================== BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg
write to 0xffff8880b588efb2 of 2 bytes by task 19788 on cpu 0: skb_reset_transport_header include/linux/skbuff.h:2463 [inline] netlink_recvmsg+0x196/0x910 net/netlink/af_netlink.c:1974 sock_recvmsg_nosec+0x5c/0x70 net/socket.c:871 ___sys_recvmsg+0x1a0/0x3e0 net/socket.c:2480 do_recvmmsg+0x19a/0x5c0 net/socket.c:2601 __sys_recvmmsg+0x1ef/0x200 net/socket.c:2680 __do_sys_recvmmsg net/socket.c:2703 [inline] __se_sys_recvmmsg net/socket.c:2696 [inline] __x64_sys_recvmmsg+0x89/0xb0 net/socket.c:2696 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9
write to 0xffff8880b588efb2 of 2 bytes by task 19789 on cpu 1: skb_reset_transport_header include/linux/skbuff.h:2463 [inline] netlink_recvmsg+0x196/0x910 net/netlink/af_netlink.c:1974 sock_recvmsg_nosec net/socket.c:871 [inline] sock_recvmsg net/socket.c:889 [inline] sock_recvmsg+0x92/0xb0 net/socket.c:885 __sys_recvfrom+0x1ae/0x2d0 net/socket.c:2009 __do_sys_recvfrom net/socket.c:2027 [inline] __se_sys_recvfrom net/socket.c:2023 [inline] __x64_sys_recvfrom+0x89/0xb0 net/socket.c:2023 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9
Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 19789 Comm: syz-executor.0 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 19789 Comm: syz-executor.0 Not tainted 5.4.0-rc6+ #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+0xf5/0x159 lib/dump_stack.c:113 panic+0x210/0x640 kernel/panic.c:221 kcsan_report.cold+0xc/0xe kernel/kcsan/report.c:302 kcsan_setup_watchpoint+0x3fe/0x410 kernel/kcsan/core.c:357 check_access kernel/kcsan/core.c:409 [inline] __tsan_unaligned_write2+0x143/0x1f0 kernel/kcsan/core.c:528 skb_reset_transport_header include/linux/skbuff.h:2463 [inline] netlink_recvmsg+0x196/0x910 net/netlink/af_netlink.c:1974 sock_recvmsg_nosec net/socket.c:871 [inline] sock_recvmsg net/socket.c:889 [inline] sock_recvmsg+0x92/0xb0 net/socket.c:885 __sys_recvfrom+0x1ae/0x2d0 net/socket.c:2009 __do_sys_recvfrom net/socket.c:2027 [inline] __se_sys_recvfrom net/socket.c:2023 [inline] __x64_sys_recvfrom+0x89/0xb0 net/socket.c:2023 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45a219 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f580a978c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002d RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045a219 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f580a9796d4 R13: 00000000004c7c59 R14: 00000000004ddd80 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..
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