Hi Cong, Tested with your patch, still getting a warning, though it's a little different: ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3876 at kernel/sched/core.c:7724 __might_sleep+0x14c/0x1a0 kernel/sched/core.c:7719 do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff811f5a5c>] prepare_to_wait+0xbc/0x210 kernel/sched/wait.c:178 Modules linked in: CPU: 1 PID: 3876 Comm: a.out Not tainted 4.9.0-rc2+ #325 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 ffff88006c2d7770 ffffffff81b46914 ffff88006c2d77e8 0000000000000000 ffffffff84052960 0000000000000000 ffff88006c2d77b8 ffffffff81111237 0000000041b58ab3 ffffffff00001e2c ffffed000d85aef9 ffffffff84052960 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff81b46914>] dump_stack+0xb3/0x10f lib/dump_stack.c:51 [<ffffffff81111237>] __warn+0x1a7/0x1f0 kernel/panic.c:550 [<ffffffff8111132c>] warn_slowpath_fmt+0xac/0xd0 kernel/panic.c:565 [<ffffffff811922fc>] __might_sleep+0x14c/0x1a0 kernel/sched/core.c:7719 [< inline >] slab_pre_alloc_hook mm/slab.h:393 [< inline >] slab_alloc_node mm/slub.c:2634 [< inline >] slab_alloc mm/slub.c:2716 [<ffffffff815054fb>] kmem_cache_alloc_trace+0x1bb/0x270 mm/slub.c:2733 [< inline >] kmalloc ./include/linux/slab.h:490 [<ffffffff83889e62>] dccp_feat_entry_new+0x182/0x2a0 net/dccp/feat.c:468 [<ffffffff8388a1ea>] dccp_feat_push_confirm+0x3a/0x270 net/dccp/feat.c:516 [< inline >] dccp_feat_change_recv net/dccp/feat.c:1160 [<ffffffff8388d587>] dccp_feat_parse_options+0xb37/0x13d0 net/dccp/feat.c:1412 [<ffffffff83894f61>] dccp_parse_options+0x721/0x1010 net/dccp/options.c:128 [<ffffffff838912e0>] dccp_rcv_state_process+0x200/0x15b0 net/dccp/input.c:644 [<ffffffff838b8af4>] dccp_v4_do_rcv+0xf4/0x1a0 net/dccp/ipv4.c:681 [< inline >] sk_backlog_rcv ./include/net/sock.h:872 [<ffffffff82b7ceb6>] __release_sock+0x126/0x3a0 net/core/sock.c:2044 [<ffffffff82b7d189>] release_sock+0x59/0x1c0 net/core/sock.c:2502 [< inline >] inet_wait_for_connect net/ipv4/af_inet.c:547 [<ffffffff8316b2a2>] __inet_stream_connect+0x5d2/0xbb0 net/ipv4/af_inet.c:617 [<ffffffff8316b8d5>] inet_stream_connect+0x55/0xa0 net/ipv4/af_inet.c:656 [<ffffffff82b705e4>] SYSC_connect+0x244/0x2f0 net/socket.c:1533 [<ffffffff82b72dd4>] SyS_connect+0x24/0x30 net/socket.c:1514 [<ffffffff83fbf781>] entry_SYSCALL_64_fastpath+0x1f/0xc2 arch/x86/entry/entry_64.S:209 ---[ end trace c7e036cf4dc54077 ]--- Thanks! On Sat, Oct 29, 2016 at 8:10 AM, Cong Wang <xiyou.wangcong@xxxxxxxxx> wrote: > On Fri, Oct 28, 2016 at 5:40 PM, Andrey Konovalov <andreyknvl@xxxxxxxxxx> wrote: >> Hi, >> >> I've got the following error report while running the syzkaller fuzzer: >> >> ------------[ cut here ]------------ >> WARNING: CPU: 0 PID: 4608 at kernel/sched/core.c:7724 >> __might_sleep+0x14c/0x1a0 kernel/sched/core.c:7719 >> do not call blocking ops when !TASK_RUNNING; state=1 set at >> [<ffffffff811f5a5c>] prepare_to_wait+0xbc/0x210 >> kernel/sched/wait.c:178 >> Modules linked in: >> CPU: 0 PID: 4608 Comm: syz-executor Not tainted 4.9.0-rc2+ #320 >> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 >> ffff88006625f7a0 ffffffff81b46914 ffff88006625f818 0000000000000000 >> ffffffff84052960 0000000000000000 ffff88006625f7e8 ffffffff81111237 >> ffff88006aceac00 ffffffff00001e2c ffffed000cc4beff ffffffff84052960 >> Call Trace: >> [< inline >] __dump_stack lib/dump_stack.c:15 >> [<ffffffff81b46914>] dump_stack+0xb3/0x10f lib/dump_stack.c:51 >> [<ffffffff81111237>] __warn+0x1a7/0x1f0 kernel/panic.c:550 >> [<ffffffff8111132c>] warn_slowpath_fmt+0xac/0xd0 kernel/panic.c:565 >> [<ffffffff811922fc>] __might_sleep+0x14c/0x1a0 kernel/sched/core.c:7719 >> [< inline >] slab_pre_alloc_hook mm/slab.h:393 >> [< inline >] slab_alloc_node mm/slub.c:2634 >> [< inline >] slab_alloc mm/slub.c:2716 >> [<ffffffff81508da0>] __kmalloc_track_caller+0x150/0x2a0 mm/slub.c:4240 >> [<ffffffff8146be14>] kmemdup+0x24/0x50 mm/util.c:113 >> [<ffffffff8388b2cf>] dccp_feat_clone_sp_val.part.5+0x4f/0xe0 >> net/dccp/feat.c:374 >> [< inline >] dccp_feat_clone_sp_val net/dccp/feat.c:1141 >> [< inline >] dccp_feat_change_recv net/dccp/feat.c:1141 >> [<ffffffff8388d491>] dccp_feat_parse_options+0xaa1/0x13d0 net/dccp/feat.c:1411 >> [<ffffffff83894f01>] dccp_parse_options+0x721/0x1010 net/dccp/options.c:128 >> [<ffffffff83891280>] dccp_rcv_state_process+0x200/0x15b0 net/dccp/input.c:644 >> [<ffffffff838b8a94>] dccp_v4_do_rcv+0xf4/0x1a0 net/dccp/ipv4.c:681 >> [< inline >] sk_backlog_rcv ./include/net/sock.h:872 >> [<ffffffff82b7ceb6>] __release_sock+0x126/0x3a0 net/core/sock.c:2044 >> [<ffffffff82b7d189>] release_sock+0x59/0x1c0 net/core/sock.c:2502 >> [< inline >] inet_wait_for_connect net/ipv4/af_inet.c:547 >> [<ffffffff8316b2a2>] __inet_stream_connect+0x5d2/0xbb0 net/ipv4/af_inet.c:617 >> [<ffffffff8316b8d5>] inet_stream_connect+0x55/0xa0 net/ipv4/af_inet.c:656 >> [<ffffffff82b705e4>] SYSC_connect+0x244/0x2f0 net/socket.c:1533 >> [<ffffffff82b72dd4>] SyS_connect+0x24/0x30 net/socket.c:1514 >> [<ffffffff83fbf701>] entry_SYSCALL_64_fastpath+0x1f/0xc2 >> arch/x86/entry/entry_64.S:209 > > Should be fixed the attached patch. I will verify it with your > reproducer tomorrow. > > Thanks! -- To unsubscribe from this list: send the line "unsubscribe dccp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
