Wed, Dec 20, 2017 at 02:59:21AM CET, kubak...@wp.pl wrote: >Hi! > >If I run the netdevsim test long enough on a kernel with no debugging
Just running tools/testing/selftests/bpf/test_offload.py? >I get this: Could you try to run it with kasan on? > >[ 1400.450124] BUG: unable to handle kernel paging request at 000000046474e552 >[ 1400.458005] IP: 0x46474e552 >[ 1400.461231] PGD 0 P4D 0 >[ 1400.464150] Oops: 0010 [#1] PREEMPT SMP >[ 1400.468525] Modules linked in: cls_bpf sch_ingress algif_hash af_alg >netdevsim rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace f3 >[ 1400.516951] CPU: 3 PID: 0 Comm: swapper/3 Not tainted >4.15.0-rc3-perf-00918-g129c9981a55f #918 >[ 1400.526678] Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.3.4 >11/08/2016 >[ 1400.535150] RIP: 0010:0x46474e552 >[ 1400.538941] RSP: 0018:ffff9f736f083f08 EFLAGS: 00010216 >[ 1400.544870] RAX: ffff9f736b4771b8 RBX: ffff9f736f09b880 RCX: >ffff9f736b4771b8 >[ 1400.552935] RDX: 000000046474e552 RSI: ffff9f736f083f18 RDI: >ffff9f736b4771b8 >[ 1400.561001] RBP: ffffffff8bc4a740 R08: ffff9f736b4771b8 R09: >0000000000000000 >[ 1400.569066] R10: ffff9f736f083d90 R11: 0000000000000000 R12: >ffff9f736f09b8b8 >[ 1400.577132] R13: 000000000000000a R14: 7fffffffffffffff R15: >0000000000000202 >[ 1400.585197] FS: 0000000000000000(0000) GS:ffff9f736f080000(0000) >knlGS:0000000000000000 >[ 1400.594349] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >[ 1400.600859] CR2: 000000046474e552 CR3: 0000000839c09001 CR4: >00000000003606e0 >[ 1400.608917] DR0: 0000000000000000 DR1: 0000000000000000 DR2: >0000000000000000 >[ 1400.616982] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: >0000000000000400 >[ 1400.625048] Call Trace: >[ 1400.627868] <IRQ> >[ 1400.630207] ? rcu_process_callbacks+0x1a0/0x4d0 >[ 1400.635458] ? __do_softirq+0xd1/0x30a >[ 1400.639739] ? irq_exit+0xae/0xb0 >[ 1400.643532] ? smp_apic_timer_interrupt+0x60/0x140 >[ 1400.648977] ? apic_timer_interrupt+0x8c/0xa0 >[ 1400.653934] </IRQ> >[ 1400.656370] ? cpuidle_enter_state+0xb0/0x2f0 >[ 1400.661328] ? cpuidle_enter_state+0x8d/0x2f0 >[ 1400.666287] ? do_idle+0x17b/0x1d0 >[ 1400.670167] ? cpu_startup_entry+0x5f/0x70 >[ 1400.674836] ? start_secondary+0x169/0x190 >[ 1400.679504] ? secondary_startup_64+0xa5/0xb0 >[ 1400.684466] Code: Bad RIP value. >[ 1400.688259] RIP: 0x46474e552 RSP: ffff9f736f083f08 >[ 1400.693703] CR2: 000000046474e552 >[ 1400.697501] ---[ end trace fab2c0fb826644df ]--- >[ 1400.708442] Kernel panic - not syncing: Fatal exception in interrupt >[ 1400.715693] Kernel Offset: 0xa000000 from 0xffffffff81000000 (relocation >range: 0xffffffff80000000-0xffffffffbfffffff) >[ 1400.732994] ---[ end Kernel panic - not syncing: Fatal exception in >interrupt > >Unfortunately reproducing the crash on an instrumented kernel seems to >be difficult.. > >I managed to gather this: > >[ 26.157415] ------------[ cut here ]------------ >[ 26.162670] ODEBUG: free active (active state 1) object type: rcu_head >hint: (null) >[ 26.172361] WARNING: CPU: 19 PID: 1352 at ../lib/debugobjects.c:291 >debug_print_object+0x64/0x80 >[ 26.182288] Modules linked in: cls_bpf sch_ingress algif_hash af_alg >netdevsim rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace f3 >[ 26.230728] CPU: 19 PID: 1352 Comm: tc Not tainted >4.15.0-rc3-perf-00918-g129c9981a55f #4 >[ 26.239977] Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.3.4 >11/08/2016 >[ 26.248453] RIP: 0010:debug_print_object+0x64/0x80 >[ 26.253896] RSP: 0018:ffffb7340410fa00 EFLAGS: 00010086 >[ 26.259825] RAX: 0000000000000051 RBX: ffff8f1f6b7cc5a0 RCX: >0000000000000006 >[ 26.267892] RDX: 0000000000000007 RSI: 0000000000000082 RDI: >ffff8f1f6f48cdd0 >[ 26.275959] RBP: ffffffffb3c48600 R08: 0000000000000000 R09: >00000000000005f2 >[ 26.284042] R10: 000000000000001e R11: ffffffffb41c35ad R12: >ffffffffb3a1d101 >[ 26.292125] R13: ffff8f1f6b7cc5a0 R14: ffffffffb423a8b8 R15: >0000000000000001 >[ 26.300194] FS: 00007f64d4956700(0000) GS:ffff8f1f6f480000(0000) >knlGS:0000000000000000 >[ 26.309346] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >[ 26.315859] CR2: 0000000001cbc498 CR3: 000000086a8a2004 CR4: >00000000003606e0 >[ 26.323925] DR0: 0000000000000000 DR1: 0000000000000000 DR2: >0000000000000000 >[ 26.331994] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: >0000000000000400 >[ 26.331994] Call Trace: >[ 26.331998] debug_check_no_obj_freed+0x1e6/0x220 >[ 26.332020] ? qdisc_graft+0x14f/0x450 >[ 26.332025] kfree+0x14d/0x1b0 >[ 26.332027] qdisc_graft+0x14f/0x450 >[ 26.332029] tc_get_qdisc+0x12f/0x200 >[ 26.332035] rtnetlink_rcv_msg+0x122/0x310 >[ 26.332039] ? __skb_try_recv_datagram+0xef/0x150 >[ 26.332040] ? __kmalloc_node_track_caller+0x205/0x2b0 >[ 26.332042] ? rtnl_calcit.isra.12+0x100/0x100 >[ 26.332044] netlink_rcv_skb+0x8d/0x130 >[ 26.332046] netlink_unicast+0x16a/0x210 >[ 26.332048] netlink_sendmsg+0x32a/0x370 >[ 26.332054] sock_sendmsg+0x2d/0x40 >[ 26.332056] ___sys_sendmsg+0x298/0x2e0 >[ 26.332061] ? mem_cgroup_commit_charge+0x7a/0x540 >[ 26.332062] ? mem_cgroup_try_charge+0x8e/0x1d0 >[ 26.332066] ? __handle_mm_fault+0x3a1/0x1190 >[ 26.332068] ? __sys_sendmsg+0x41/0x70 >[ 26.332069] __sys_sendmsg+0x41/0x70 >[ 26.332074] entry_SYSCALL_64_fastpath+0x1e/0x81 >[ 26.332076] RIP: 0033:0x7f64d3b53450 >[ 26.332076] RSP: 002b:00007fffb5ea4388 EFLAGS: 00000246 ORIG_RAX: >000000000000002e >[ 26.332077] RAX: ffffffffffffffda RBX: 00007f64d3e0fb20 RCX: >00007f64d3b53450 >[ 26.332078] RDX: 0000000000000000 RSI: 00007fffb5ea43e0 RDI: >0000000000000003 >[ 26.332078] RBP: 0000000000000a11 R08: 0000000000000000 R09: >000000000000000f >[ 26.332079] R10: 00000000000005e7 R11: 0000000000000246 R12: >00007f64d3e0fb78 >[ 26.332079] R13: 00007f64d3e0fb78 R14: 000000000000270f R15: >00007f64d3e0fb78 >[ 26.332081] Code: c1 83 c2 01 8b 4b 14 4c 8b 45 00 89 15 f6 d0 e5 00 8b 53 >10 4c 89 e6 48 c7 c7 38 7c a3 b3 48 8b 14 d5 80 3d 85 b >[ 26.332097] ---[ end trace bd33b199ae76ad43 ]---
