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Date: Thu, 25 Dec 2014 22:22:48 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: netdev@...r.kernel.org
Subject: NULL pointer dereference at skb_queue_tail()
Hello.
I can reproduce below oops when testing Linux 3.18 with memory allocation
failure injection module at https://lkml.org/lkml/2014/12/25/64 .
Looks similar to http://oops.kernel.org/oops/bug-unable-to-handle-kernel-null-pointer-dereference-at-skb_queue_tail/ .
Where should I check?
----------
[ 273.709905] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 273.713845] IP: [<ffffffff81535e27>] skb_queue_tail+0x37/0x60
[ 273.716720] PGD 7887d067 PUD 7bc5b067 PMD 0
[ 273.718647] Oops: 0002 [#1] SMP
[ 273.719508] Modules linked in: fault_injection(OE) ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_mangle ip6table_raw ip6table_filter ip6_tables iptable_mangle iptable_raw iptable_filter ip_tables coretemp crct10dif_pclmul crc32_pclmul dm_mirror crc32c_intel dm_region_hash ghash_clmulni_intel dm_log aesni_intel glue_helper dm_mod lrw gf128mul ablk_helper cryptd vmw_balloon ppdev microcode parport_pc serio_raw pcspkr vmw_vmci parport i2c_piix4 shpchp nfsd auth_rpcgss nfs_acl lockd grace sunrpc uinput sd_mod ata_generic pata_acpi vmwgfx drm_kms_helper ttm drm mptspi e1000 scsi_transport_spi mptscsih mptbase ata_piix libata i2c_core floppy [last unloaded: fault_injection]
[ 273.739290] CPU: 2 PID: 2866 Comm: Xorg Tainted: G W OE 3.18.0+ #337
[ 273.741001] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013
[ 273.743534] task: ffff880079f18000 ti: ffff88007a894000 task.ti: ffff88007a894000
[ 273.745288] RIP: 0010:[<ffffffff81535e27>] [<ffffffff81535e27>] skb_queue_tail+0x37/0x60
[ 273.747275] RSP: 0018:ffff88007a897c18 EFLAGS: 00010046
[ 273.748535] RAX: 0000000000000296 RBX: ffff8800360c0b10 RCX: 0000000000000000
[ 273.750216] RDX: 0000000000000000 RSI: 0000000000000296 RDI: ffff8800360c0b24
[ 273.751921] RBP: ffff88007a897c38 R08: 0000000000000296 R09: 0000000000000300
[ 273.753624] R10: ffff88007f803600 R11: ffff88007a9dbd00 R12: ffff8800360c0b10
[ 273.755336] R13: ffff8800360c0b24 R14: 0000000000000000 R15: 0000000000000000
[ 273.757046] FS: 00007f512a6b0980(0000) GS:ffff88007fc80000(0000) knlGS:0000000000000000
[ 273.758940] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 273.760295] CR2: 0000000000000000 CR3: 000000007bf4f000 CR4: 00000000000407e0
[ 273.762047] Stack:
[ 273.762541] 0000000000000020 ffff8800360c0b10 0000000000000020 ffff8800360c0a80
[ 273.764392] ffff88007a897cf8 ffffffff815e9b11 ffff880048861498 ffff8800360c0b10
[ 273.766256] 0000002000000296 ffff88007a897d08 0000000000000020 ffff8800360c0d78
[ 273.768099] Call Trace:
[ 273.768695] [<ffffffff815e9b11>] unix_stream_sendmsg+0x1d1/0x420
[ 273.770157] [<ffffffff8152cf2a>] sock_aio_write+0xca/0xe0
[ 273.771472] [<ffffffff811af8bc>] do_sync_readv_writev+0x4c/0x80
[ 273.772910] [<ffffffff811b1255>] do_readv_writev+0x1e5/0x280
[ 273.774277] [<ffffffffa01656d5>] ? vmw_unlocked_ioctl+0x15/0x20 [vmwgfx]
[ 273.775899] [<ffffffff811c2f40>] ? do_vfs_ioctl+0x2e0/0x4c0
[ 273.777254] [<ffffffff811ccfa5>] ? __fget_light+0x25/0x70
[ 273.778557] [<ffffffff81100e84>] ? __audit_syscall_entry+0xb4/0x110
[ 273.780056] [<ffffffff811b1379>] vfs_writev+0x39/0x50
[ 273.781492] [<ffffffff811b14aa>] SyS_writev+0x4a/0xd0
[ 273.782741] [<ffffffff81647729>] system_call_fastpath+0x12/0x17
[ 273.784192] Code: 8d 6f 14 41 54 49 89 f4 53 48 89 fb 4c 89 ef 48 83 ec 08 e8 ec 13 11 00 48 8b 53 08 49 89 1c 24 4c 89 ef 48 89 c6 49 89 54 24 08 <4c> 89 22 83 43 10 01 4c 89 63 08 e8 19 10 11 00 48 83 c4 08 5b
[ 273.790477] RIP [<ffffffff81535e27>] skb_queue_tail+0x37/0x60
[ 273.791954] RSP <ffff88007a897c18>
[ 273.792798] CR2: 0000000000000000
----------
----------
crash> bt -l
PID: 2866 TASK: ffff880079f18000 CPU: 2 COMMAND: "Xorg"
#0 [ffff88007a8977f0] machine_kexec at ffffffff8104d092
/root/linux/arch/x86/kernel/machine_kexec_64.c: 319
#1 [ffff88007a897840] crash_kexec at ffffffff810ea6d3
/root/linux/kernel/kexec.c: 1482
#2 [ffff88007a897910] oops_end at ffffffff81016678
/root/linux/arch/x86/kernel/dumpstack.c: 231
#3 [ffff88007a897940] no_context at ffffffff8163bbc2
/root/linux/arch/x86/mm/fault.c: 724
#4 [ffff88007a8979a0] __bad_area_nosemaphore at ffffffff8163bc99
/root/linux/arch/x86/mm/fault.c: 804
#5 [ffff88007a8979f0] bad_area at ffffffff8163be4b
/root/linux/arch/x86/mm/fault.c: 833
#6 [ffff88007a897a20] __do_page_fault at ffffffff81057933
/root/linux/arch/x86/mm/fault.c: 1220
#7 [ffff88007a897b30] do_page_fault at ffffffff810579f1
/root/linux/arch/x86/mm/fault.c: 1299
#8 [ffff88007a897b60] page_fault at ffffffff816495e8
/root/linux/arch/x86/kernel/entry_64.S: 1255
[exception RIP: skb_queue_tail+55]
RIP: ffffffff81535e27 RSP: ffff88007a897c18 RFLAGS: 00010046
RAX: 0000000000000296 RBX: ffff8800360c0b10 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000296 RDI: ffff8800360c0b24
RBP: ffff88007a897c38 R8: 0000000000000296 R9: 0000000000000300
R10: ffff88007f803600 R11: ffff88007a9dbd00 R12: ffff8800360c0b10
R13: ffff8800360c0b24 R14: 0000000000000000 R15: 0000000000000000
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#9 [ffff88007a897c40] unix_stream_sendmsg at ffffffff815e9b11
/root/linux/net/unix/af_unix.c: 1712
#10 [ffff88007a897d00] sock_aio_write at ffffffff8152cf2a
/root/linux/net/socket.c: 980
#11 [ffff88007a897d90] do_sync_readv_writev at ffffffff811af8bc
/root/linux/fs/read_write.c: 685
#12 [ffff88007a897e20] do_readv_writev at ffffffff811b1255
/root/linux/fs/read_write.c: 839
#13 [ffff88007a897f20] vfs_writev at ffffffff811b1379
/root/linux/fs/read_write.c: 881
#14 [ffff88007a897f30] sys_writev at ffffffff811b14aa
/root/linux/fs/read_write.c: 914
#15 [ffff88007a897f80] system_call_fastpath at ffffffff81647729
/root/linux/arch/x86/kernel/entry_64.S: 423
RIP: 00007f51285923c0 RSP: 00007fff324a0e00 RFLAGS: 00013202
RAX: ffffffffffffffda RBX: ffffffff81647729 RCX: 00000000004c66f0
RDX: 0000000000000001 RSI: 00007fff324a0840 RDI: 0000000000000013
RBP: 000000000210e4b0 R8: 0000000000000000 R9: 0000000000400000
R10: 0000000000000000 R11: 0000000000003293 R12: 00007f512a6b06a0
R13: 0000000000000001 R14: 00007fff324a0840 R15: 0000000000000000
ORIG_RAX: 0000000000000014 CS: 0033 SS: 002b
----------
void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk)
{
unsigned long flags;
spin_lock_irqsave(&list->lock, flags);
__skb_queue_tail(list, newsk);
spin_unlock_irqrestore(&list->lock, flags);
}
static inline void __skb_queue_tail(struct sk_buff_head *list,
struct sk_buff *newsk)
{
__skb_queue_before(list, (struct sk_buff *)list, newsk);
}
static inline void __skb_queue_before(struct sk_buff_head *list,
struct sk_buff *next,
struct sk_buff *newsk)
{
__skb_insert(newsk, next->prev, next, list);
}
static inline void __skb_insert(struct sk_buff *newsk,
struct sk_buff *prev, struct sk_buff *next,
struct sk_buff_head *list)
{
newsk->next = next;
newsk->prev = prev;
next->prev = prev->next = newsk; // <= ffffffff81535e27 is here.
list->qlen++;
}
--
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