Messages in this thread | | | Date | Wed, 5 Jan 2022 13:56:53 +0530 | From | Abdul Haleem <> | Subject | [5.16.0-rc5][ppc][net] kernel oops when hotplug remove of vNIC interface |
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Greeting's
Mainline kernel 5.16.0-rc5 panics when DLPAR ADD of vNIC device on my Powerpc LPAR
Perform below dlpar commands in a loop from linux OS
drmgr -r -c slot -s U9080.HEX.134C488-V1-C3 -w 5 -d 1 drmgr -a -c slot -s U9080.HEX.134C488-V1-C3 -w 5 -d 1
after 7th iteration, the kernel panics with below messages
console messages: [102056] ibmvnic 30000003 env3: Sending CRQ: 801e000864000000 0060000000000000 <intr> ibmvnic 30000003 env3: Handling CRQ: 809e000800000000 0000000000000000 [102056] ibmvnic 30000003 env3: Disabling tx_scrq[0] irq [102056] ibmvnic 30000003 env3: Disabling tx_scrq[1] irq [102056] ibmvnic 30000003 env3: Disabling rx_scrq[0] irq [102056] ibmvnic 30000003 env3: Disabling rx_scrq[1] irq [102056] ibmvnic 30000003 env3: Disabling rx_scrq[2] irq [102056] ibmvnic 30000003 env3: Disabling rx_scrq[3] irq [102056] ibmvnic 30000003 env3: Disabling rx_scrq[4] irq [102056] ibmvnic 30000003 env3: Disabling rx_scrq[5] irq [102056] ibmvnic 30000003 env3: Disabling rx_scrq[6] irq [102056] ibmvnic 30000003 env3: Disabling rx_scrq[7] irq [102056] ibmvnic 30000003 env3: Replenished 8 pools Kernel attempted to read user page (10) - exploit attempt? (uid: 0) BUG: Kernel NULL pointer dereference on read at 0x00000010 Faulting instruction address: 0xc000000000a3c840 Oops: Kernel access of bad area, sig: 11 [#1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries Modules linked in: bridge stp llc ib_core rpadlpar_io rpaphp nfnetlink tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag bonding rfkill ibmvnic sunrpc pseries_rng xts vmx_crypto gf128mul sch_fq_codel binfmt_misc ip_tables ext4 mbcache jbd2 dm_service_time sd_mod t10_pi sg ibmvfc scsi_transport_fc ibmveth dm_multipath dm_mirror dm_region_hash dm_log dm_mod fuse CPU: 9 PID: 102056 Comm: kworker/9:2 Kdump: loaded Not tainted 5.16.0-rc5-autotest-g6441998e2e37 #1 Workqueue: events_long __ibmvnic_reset [ibmvnic] NIP: c000000000a3c840 LR: c0080000029b5378 CTR: c000000000a3c820 REGS: c0000000548e37e0 TRAP: 0300 Not tainted (5.16.0-rc5-autotest-g6441998e2e37) MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE> CR: 28248484 XER: 00000004 CFAR: c0080000029bdd24 DAR: 0000000000000010 DSISR: 40000000 IRQMASK: 0 GPR00: c0080000029b55d0 c0000000548e3a80 c0000000028f0200 0000000000000000 GPR04: c000000c7d1a7e00 fffffffffffffff6 0000000000000027 c000000c7d1a7e08 GPR08: 0000000000000023 0000000000000000 0000000000000010 c0080000029bdd10 GPR12: c000000000a3c820 c000000c7fca6680 0000000000000000 c000000133016bf8 GPR16: 00000000000003fe 0000000000001000 0000000000000002 0000000000000008 GPR20: c000000133016eb0 0000000000000000 0000000000000000 0000000000000003 GPR24: c000000133016000 c000000133017168 0000000020000000 c000000133016a00 GPR28: 0000000000000006 c000000133016a00 0000000000000001 c000000133016000 NIP [c000000000a3c840] napi_enable+0x20/0xc0 LR [c0080000029b5378] __ibmvnic_open+0xf0/0x430 [ibmvnic] Call Trace: [c0000000548e3a80] [0000000000000006] 0x6 (unreliable) [c0000000548e3ab0] [c0080000029b55d0] __ibmvnic_open+0x348/0x430 [ibmvnic] [c0000000548e3b40] [c0080000029bcc28] __ibmvnic_reset+0x500/0xdf0 [ibmvnic] [c0000000548e3c60] [c000000000176228] process_one_work+0x288/0x570 [c0000000548e3d00] [c000000000176588] worker_thread+0x78/0x660 [c0000000548e3da0] [c0000000001822f0] kthread+0x1c0/0x1d0 [c0000000548e3e10] [c00000000000cf64] ret_from_kernel_thread+0x5c/0x64 Instruction dump: 7d2948f8 792307e0 4e800020 60000000 3c4c01eb 384239e0 f821ffd1 39430010 38a0fff6 e92d1100 f9210028 39200000 <e9030010> f9010020 60420000 e9210020 ---[ end trace 5f8033b08fd27706 ]--- radix-mmu: Page sizes from device-tree:
the fault instruction points to
[root@ltcden11-lp1 boot]# gdb -batch vmlinuz-5.16.0-rc5-autotest-g6441998e2e37 -ex 'list *(0xc000000000a3c840)' 0xc000000000a3c840 is in napi_enable (net/core/dev.c:6966). 6961 void napi_enable(struct napi_struct *n) 6962 { 6963 unsigned long val, new; 6964 6965 do { 6966 val = READ_ONCE(n->state); 6967 BUG_ON(!test_bit(NAPI_STATE_SCHED, &val)); 6968 6969 new = val & ~(NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC); 6970 if (n->dev->threaded && n->thread)
-- Regard's
Abdul Haleem IBM Linux Technology Center
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