On Thu, Jan 4, 2018 at 8:36 PM, Tom Herbert <t...@quantonium.net> wrote: > On Thu, Jan 4, 2018 at 4:10 AM, syzbot > <syzbot+3c6c745b0d2f341bb...@syzkaller.appspotmail.com> wrote: >> Hello, >> >> syzkaller hit the following crash on >> 6bb8824732f69de0f233ae6b1a8158e149627b38 >> git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/master >> compiler: gcc (GCC) 7.1.1 20170620 >> .config is attached >> Raw console output is attached. >> Unfortunately, I don't have any reproducer for this bug yet. >> >> >> IMPORTANT: if you fix the bug, please add the following tag to the commit: >> Reported-by: syzbot+3c6c745b0d2f341bb...@syzkaller.appspotmail.com >> It will help syzbot understand when the bug is fixed. See footer for >> details. >> If you forward the report, please keep this part and the footer. >> >> Use struct sctp_assoc_value instead >> sctp: [Deprecated]: syz-executor4 (pid 12483) Use of int in maxseg socket >> option. >> Use struct sctp_assoc_value instead >> ------------[ cut here ]------------ >> ODEBUG: free active (active state 0) object type: work_struct hint: >> strp_work+0x0/0xf0 net/strparser/strparser.c:381 >> WARNING: CPU: 1 PID: 3502 at lib/debugobjects.c:291 >> debug_print_object+0x166/0x220 lib/debugobjects.c:288 >> Kernel panic - not syncing: panic_on_warn set ... >> >> CPU: 1 PID: 3502 Comm: kworker/u4:4 Not tainted 4.15.0-rc5+ #170 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> Google 01/01/2011 >> Workqueue: kkcmd kcm_tx_work >> Call Trace: >> __dump_stack lib/dump_stack.c:17 [inline] >> dump_stack+0x194/0x257 lib/dump_stack.c:53 >> panic+0x1e4/0x41c kernel/panic.c:183 >> __warn+0x1dc/0x200 kernel/panic.c:547 >> report_bug+0x211/0x2d0 lib/bug.c:184 >> fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178 >> fixup_bug arch/x86/kernel/traps.c:247 [inline] >> do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 >> do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 >> invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1061 >> RIP: 0010:debug_print_object+0x166/0x220 lib/debugobjects.c:288 >> RSP: 0018:ffff8801c0ee7068 EFLAGS: 00010086 >> RAX: dffffc0000000008 RBX: 0000000000000003 RCX: ffffffff8159bc3e >> RDX: 0000000000000000 RSI: 1ffff100381dcdc8 RDI: ffff8801db317dd0 >> RBP: ffff8801c0ee70a8 R08: 0000000000000000 R09: 1ffff100381dcd9a >> R10: ffffed00381dce3c R11: ffffffff86137ad8 R12: 0000000000000001 >> R13: ffffffff86113480 R14: ffffffff8560dc40 R15: ffffffff8146e5f0 >> __debug_check_no_obj_freed lib/debugobjects.c:745 [inline] >> debug_check_no_obj_freed+0x662/0xf1f lib/debugobjects.c:774 >> kmem_cache_free+0x253/0x2a0 mm/slab.c:3745 > > I believe we just need to defer kmem_cache_free to call_rcu.
Hi Tom, Was this ever submitted? I don't any such change in net/kcm/kcmsock.c.
