On Wed, Feb 21, 2018 at 12:59:03PM -0800, syzbot wrote: > Hello, > > syzbot hit the following crash on upstream commit > 91ab883eb21325ad80f3473633f794c78ac87f51 (Mon Feb 19 01:29:42 2018 +0000) > Linux 4.16-rc2 > > syzkaller reproducer is attached. > Raw console output is attached. > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+9d1c0d941336dbc741a1@xxxxxxxxxxxxxxxxxxxxxxxxx > 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. > > IPVS: ftp: loaded support on port[0] = 21 > IPVS: ftp: loaded support on port[0] = 21 > IPVS: ftp: loaded support on port[0] = 21 > ------------[ cut here ]------------ > ODEBUG: free active (active state 0) object type: work_struct hint: > htable_gc+0x0/0xc0 net/netfilter/xt_hashlimit.c:376 > WARNING: CPU: 1 PID: 4165 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: 4165 Comm: syz-executor3 Not tainted 4.16.0-rc2+ #320 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > 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+0x58/0x80 arch/x86/entry/entry_64.S:957 > RIP: 0010:debug_print_object+0x166/0x220 lib/debugobjects.c:288 > RSP: 0018:ffff8801b3d8f790 EFLAGS: 00010082 > RAX: dffffc0000000008 RBX: 0000000000000003 RCX: ffffffff815abdbe > RDX: 0000000000000000 RSI: 1ffff100367b1ea2 RDI: 1ffff100367b1e77 > RBP: ffff8801b3d8f7d0 R08: 0000000000000000 R09: 1ffff100367b1e49 > R10: ffffed00367b1f21 R11: ffffffff86b394b8 R12: 0000000000000001 > R13: ffffffff86b14d80 R14: ffffffff86007de0 R15: ffffffff8147ac00 > __debug_check_no_obj_freed lib/debugobjects.c:745 [inline] > debug_check_no_obj_freed+0x662/0xf1f lib/debugobjects.c:774 > __vunmap+0x112/0x380 mm/vmalloc.c:1530 > vfree+0x50/0xe0 mm/vmalloc.c:1606 > copy_entries_to_user net/ipv4/netfilter/arp_tables.c:714 [inline] > get_entries net/ipv4/netfilter/arp_tables.c:867 [inline] > do_arpt_get_ctl+0x7c4/0xa00 net/ipv4/netfilter/arp_tables.c:1485 > nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] > nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122 > ip_getsockopt+0x15c/0x220 net/ipv4/ip_sockglue.c:1571 > tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3359 > sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2934 > SYSC_getsockopt net/socket.c:1880 [inline] > SyS_getsockopt+0x178/0x340 net/socket.c:1862 > do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > RIP: 0033:0x45687a > RSP: 002b:0000000000a3eb48 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 > RAX: ffffffffffffffda RBX: 0000000000000027 RCX: 000000000045687a > RDX: 0000000000000061 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000a3f200 R08: 0000000000a3eb7c R09: 0000000000000001 > R10: 0000000000a3f200 R11: 0000000000000212 R12: 0000000000a3eb80 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000001380 > Like the similar bug report "WARNING: ODEBUG bug in do_ipt_get_ctl" [1], this report doesn't make sense as there is no work_struct in the array being freed. And this last occurred 4 months ago. So I am invalidating this one too as it probably was a weird bug elsewhere in the kernel that has since been fixed: #syz invalid [1] https://groups.google.com/forum/#!msg/syzkaller-bugs/A_gWpsvtxKc/5YSSVpImDQAJ - Eric -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
