======================================================
[ INFO: possible circular locking dependency detected ]
4.4.120-gd63fdf6 #29 Not tainted
-------------------------------------------------------
syz-executor7/6847 is trying to acquire lock:
audit: type=1400 audit(1521786924.605:17): avc:  denied  { relabelto } for  pid=6853 comm="syz-executor4" name="UDPv6" dev="sockfs" ino=15168 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:netcontrol_device_t:s0 tclass=udp_socket permissive=1
audit: type=1400 audit(1521786924.605:18): avc:  denied  { ioctl } for  pid=6853 comm="syz-executor4" path="socket:[15168]" dev="sockfs" ino=15168 ioctlcmd=8916 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:netcontrol_device_t:s0 tclass=sock_file permissive=1
 (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<ffffffff81463361>] shmem_file_llseek+0xf1/0x240 mm/shmem.c:1816

but task is already holding lock:
 (ashmem_mutex){+.+.+.}, at: [<ffffffff82c62016>] ashmem_llseek+0x56/0x1f0 drivers/staging/android/ashmem.c:330

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

       [<ffffffff8123d7ce>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
       [<ffffffff8376a39b>] __mutex_lock_common kernel/locking/mutex.c:521 [inline]
       [<ffffffff8376a39b>] mutex_lock_nested+0xbb/0x850 kernel/locking/mutex.c:621
       [<ffffffff82c61463>] ashmem_mmap+0x53/0x400 drivers/staging/android/ashmem.c:366
       [<ffffffff814b0e4f>] mmap_region+0x94f/0x1250 mm/mmap.c:1664
       [<ffffffff814b1c4d>] do_mmap+0x4fd/0x9d0 mm/mmap.c:1441
       [<ffffffff814700ce>] do_mmap_pgoff include/linux/mm.h:1915 [inline]
       [<ffffffff814700ce>] vm_mmap_pgoff+0x16e/0x1c0 mm/util.c:296
       [<ffffffff814afe1f>] SYSC_mmap_pgoff mm/mmap.c:1491 [inline]
       [<ffffffff814afe1f>] SyS_mmap_pgoff+0x33f/0x560 mm/mmap.c:1449
       [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
       [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
       [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17

       [<ffffffff8123d7ce>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
       [<ffffffff814956ea>] __might_fault+0x14a/0x1d0 mm/memory.c:3810
       [<ffffffff8155ab22>] copy_to_user arch/x86/include/asm/uaccess.h:760 [inline]
       [<ffffffff8155ab22>] filldir+0x162/0x2d0 fs/readdir.c:180
       [<ffffffff8159820e>] dir_emit_dot include/linux/fs.h:3070 [inline]
       [<ffffffff8159820e>] dir_emit_dots include/linux/fs.h:3081 [inline]
       [<ffffffff8159820e>] dcache_readdir+0x11e/0x7b0 fs/libfs.c:150
       [<ffffffff8155a768>] iterate_dir+0x1c8/0x420 fs/readdir.c:42
       [<ffffffff8155b45a>] SYSC_getdents fs/readdir.c:215 [inline]
       [<ffffffff8155b45a>] SyS_getdents+0x14a/0x270 fs/readdir.c:196
       [<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98

       [<ffffffff8123ab2f>] check_prev_add kernel/locking/lockdep.c:1853 [inline]
       [<ffffffff8123ab2f>] check_prevs_add kernel/locking/lockdep.c:1958 [inline]
       [<ffffffff8123ab2f>] validate_chain kernel/locking/lockdep.c:2144 [inline]
       [<ffffffff8123ab2f>] __lock_acquire+0x371f/0x4b50 kernel/locking/lockdep.c:3213
       [<ffffffff8123d7ce>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
       [<ffffffff8376a39b>] __mutex_lock_common kernel/locking/mutex.c:521 [inline]
       [<ffffffff8376a39b>] mutex_lock_nested+0xbb/0x850 kernel/locking/mutex.c:621
       [<ffffffff81463361>] shmem_file_llseek+0xf1/0x240 mm/shmem.c:1816
       [<ffffffff8151c762>] vfs_llseek+0xa2/0xd0 fs/read_write.c:260
       [<ffffffff82c620a7>] ashmem_llseek+0xe7/0x1f0 drivers/staging/android/ashmem.c:342
       [<ffffffff8151e6db>] vfs_llseek fs/read_write.c:260 [inline]
       [<ffffffff8151e6db>] SYSC_lseek fs/read_write.c:285 [inline]
       [<ffffffff8151e6db>] SyS_lseek fs/read_write.c:276 [inline]
       [<ffffffff8151e6db>] C_SYSC_lseek fs/read_write.c:297 [inline]
       [<ffffffff8151e6db>] compat_SyS_lseek+0xeb/0x170 fs/read_write.c:295
       [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
       [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
       [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17

other info that might help us debug this:

Chain exists of:
 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(ashmem_mutex);
                               lock(&mm->mmap_sem);
                               lock(ashmem_mutex);
  lock(&sb->s_type->i_mutex_key#10);

 *** DEADLOCK ***

1 lock held by syz-executor7/6847:
 #0:  (ashmem_mutex){+.+.+.}, at: [<ffffffff82c62016>] ashmem_llseek+0x56/0x1f0 drivers/staging/android/ashmem.c:330

stack backtrace:
CPU: 0 PID: 6847 Comm: syz-executor7 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 049669f5b6a1fd3c ffff8800b8dcfa58 ffffffff81d0408d
 ffffffff8519fe60 ffffffff851a99a0 ffffffff851be970 ffff8800b95188f8
 ffff8800b9518000 ffff8800b8dcfaa0 ffffffff81233ba1 ffff8800b95188f8
Call Trace:
 [<ffffffff81d0408d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0408d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81233ba1>] print_circular_bug+0x271/0x310 kernel/locking/lockdep.c:1226
 [<ffffffff8123ab2f>] check_prev_add kernel/locking/lockdep.c:1853 [inline]
 [<ffffffff8123ab2f>] check_prevs_add kernel/locking/lockdep.c:1958 [inline]
 [<ffffffff8123ab2f>] validate_chain kernel/locking/lockdep.c:2144 [inline]
 [<ffffffff8123ab2f>] __lock_acquire+0x371f/0x4b50 kernel/locking/lockdep.c:3213
 [<ffffffff8123d7ce>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff8376a39b>] __mutex_lock_common kernel/locking/mutex.c:521 [inline]
 [<ffffffff8376a39b>] mutex_lock_nested+0xbb/0x850 kernel/locking/mutex.c:621
 [<ffffffff81463361>] shmem_file_llseek+0xf1/0x240 mm/shmem.c:1816
 [<ffffffff8151c762>] vfs_llseek+0xa2/0xd0 fs/read_write.c:260
 [<ffffffff82c620a7>] ashmem_llseek+0xe7/0x1f0 drivers/staging/android/ashmem.c:342
 [<ffffffff8151e6db>] vfs_llseek fs/read_write.c:260 [inline]
 [<ffffffff8151e6db>] SYSC_lseek fs/read_write.c:285 [inline]
 [<ffffffff8151e6db>] SyS_lseek fs/read_write.c:276 [inline]
 [<ffffffff8151e6db>] C_SYSC_lseek fs/read_write.c:297 [inline]
 [<ffffffff8151e6db>] compat_SyS_lseek+0xeb/0x170 fs/read_write.c:295
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17
capability: warning: `syz-executor5' uses deprecated v2 capabilities in a way that may be insecure
audit: type=1400 audit(1521786925.255:19): avc:  denied  { ioctl } for  pid=6900 comm="syz-executor3" path="socket:[15277]" dev="sockfs" ino=15277 ioctlcmd=6419 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1
TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
PF_BRIDGE: RTM_SETLINK with unknown ifindex
PF_BRIDGE: RTM_SETLINK with unknown ifindex
syz-executor2 (7108): /proc/7104/oom_adj is deprecated, please use /proc/7104/oom_score_adj instead.
TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
audit: type=1400 audit(1521786926.205:20): avc:  denied  { create } for  pid=7197 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=key permissive=1
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor7/7276
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 1 PID: 7276 Comm: syz-executor7 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 b63462080e613def ffff8800b6e9f648 ffffffff81d0408d
 0000000000000001 ffffffff839fe5a0 ffffffff83d0be20 ffff8801d3931800
 0000000000000003 ffff8800b6e9f688 ffffffff81d63fe4 ffff8800b6e9f6a0
Call Trace:
 [<ffffffff81d0408d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0408d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81d63fe4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81d6404c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff832e2f08>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff832e2f08>] ipcomp_init_state+0x188/0x980 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8324ac70>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff832c1817>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2058
 [<ffffffff832c1f7a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2084
 [<ffffffff8344681b>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff8344681b>] pfkey_add+0x1fbb/0x3490 net/key/af_key.c:1506
 [<ffffffff8344a45b>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff8344bcb9>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82deba6a>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82deba6a>] sock_sendmsg+0xca/0x110 net/socket.c:635
 [<ffffffff82ded641>] ___sys_sendmsg+0x6c1/0x7c0 net/socket.c:1962
 [<ffffffff82def693>] __sys_sendmsg+0xd3/0x190 net/socket.c:1996
 [<ffffffff82eda56a>] C_SYSC_sendmsg net/compat.c:720 [inline]
 [<ffffffff82eda56a>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:718
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17
vmalloc: allocation failure: 0 bytes
syz-executor4: page allocation failure: order:0, mode:0x24000c2
CPU: 0 PID: 7322 Comm: syz-executor4 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 d44cd0d9cffbd5e1 ffff8801c33a7898 ffffffff81d0408d
 1ffff10038674f16 ffff8801d3cc6000 00000000024000c2 0000000000000000
 0000000000000001 ffff8801c33a79a8 ffffffff81431059 ffffffff838ac620
Call Trace:
 [<ffffffff81d0408d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0408d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81431059>] warn_alloc_failed+0x1d9/0x240 mm/page_alloc.c:2757
 [<ffffffff814c868d>] __vmalloc_node_range+0x41d/0x630 mm/vmalloc.c:1692
 [<ffffffff814c896b>] __vmalloc_node mm/vmalloc.c:1715 [inline]
 [<ffffffff814c896b>] __vmalloc_node_flags mm/vmalloc.c:1729 [inline]
 [<ffffffff814c896b>] vmalloc+0x5b/0x70 mm/vmalloc.c:1744
 [<ffffffff81b70350>] sel_write_load+0x130/0xff0 security/selinux/selinuxfs.c:527
audit: type=1326 audit(1521786927.455:21): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7351 comm="syz-executor1" exe="/root/syz-executor1" sig=31 arch=40000003 syscall=240 compat=1 ip=0xf77bbba9 code=0x0
 [<ffffffff8151d373>] __vfs_write+0x103/0x450 fs/read_write.c:489
audit: type=1326 audit(1521786927.525:22): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7351 comm="syz-executor1" exe="/root/syz-executor1" sig=31 arch=40000003 syscall=240 compat=1 ip=0xf77bbba9 code=0x0
 [<ffffffff8151f1da>] vfs_write+0x18a/0x530 fs/read_write.c:538
 [<ffffffff81521c4f>] SYSC_pwrite64 fs/read_write.c:627 [inline]
 [<ffffffff81521c4f>] SyS_pwrite64+0x13f/0x170 fs/read_write.c:614
 [<ffffffff81119cb9>] sys32_pwrite+0x39/0x50 arch/x86/ia32/sys_ia32.c:186
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17
Mem-Info:
active_anon:51838 inactive_anon:44 isolated_anon:0
 active_file:3529 inactive_file:8469 isolated_file:0
 unevictable:0 dirty:93 writeback:0 unstable:0
 slab_reclaimable:6026 slab_unreclaimable:59455
 mapped:23820 shmem:51 pagetables:610 bounce:0
 free:1476320 free_pcp:503 free_cma:0
DMA free:15904kB min:160kB low:200kB high:240kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15904kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
lowmem_reserve[]: 0 2911 6411 6411
DMA32 free:2676576kB min:30608kB low:38260kB high:45912kB active_anon:90816kB inactive_anon:92kB active_file:6400kB inactive_file:17052kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3129292kB managed:2982732kB mlocked:0kB dirty:128kB writeback:0kB mapped:47264kB shmem:96kB slab_reclaimable:11172kB slab_unreclaimable:110492kB kernel_stack:2656kB pagetables:900kB unstable:0kB bounce:0kB free_pcp:800kB local_pcp:164kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 3500 3500
Normal free:3213424kB min:36808kB low:46008kB high:55212kB active_anon:116536kB inactive_anon:84kB active_file:7716kB inactive_file:16824kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:4718592kB managed:3584660kB mlocked:0kB dirty:260kB writeback:0kB mapped:48016kB shmem:108kB slab_reclaimable:12932kB slab_unreclaimable:127148kB kernel_stack:4000kB pagetables:1540kB unstable:0kB bounce:0kB free_pcp:1200kB local_pcp:488kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0 0
DMA: 0*4kB 0*8kB 0*16kB 1*32kB (U) 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15904kB
DMA32: 193*4kB (UME) 88*8kB (UME) 102*16kB (UM) 82*32kB (UME) 35*64kB (UME) 26*128kB (UM) 17*256kB (UME) 16*512kB (UME) 28*1024kB (M) 4*2048kB (UM) 639*4096kB (M) = 2678052kB
Normal: 232*4kB (UME) 118*8kB (UME) 108*16kB (UME) 104*32kB (UME) 80*64kB (UME) 27*128kB (UM) 18*256kB (M) 11*512kB (UM) 31*1024kB (ME) 3*2048kB (ME) 769*4096kB (M) = 3213456kB
Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
12054 total pagecache pages
0 pages in swap cache
Swap cache stats: add 0, delete 0, find 0/0
Free swap  = 0kB
Total swap = 0kB
1965969 pages RAM
0 pages HighMem/MovableOnly
320145 pages reserved
netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'.
binder_alloc: binder_alloc_mmap_handler: 7553 20000000-20002000 already mapped failed -16
binder: BINDER_SET_CONTEXT_MGR already set
binder: 7553:7568 ioctl 40046207 0 returned -16
binder_alloc: 7553: binder_alloc_buf, no vma
binder: 7553:7577 transaction failed 29189/-3, size 0-0 line 3128
binder: 7553:7568 got reply transaction with no transaction stack
binder: 7553:7568 transaction failed 29201/-71, size 0-0 line 2921
binder: undelivered TRANSACTION_ERROR: 29201
binder: undelivered TRANSACTION_ERROR: 29189
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=6824 sclass=netlink_route_socket
binder: undelivered TRANSACTION_COMPLETE
binder: undelivered transaction 23, process died.
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=6824 sclass=netlink_route_socket
binder: undelivered TRANSACTION_COMPLETE
audit: type=1400 audit(1521786929.355:23): avc:  denied  { create } for  pid=7719 comm="syz-executor6" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_iscsi_socket permissive=1
binder: BINDER_SET_CONTEXT_MGR already set
binder: 7739:7749 ioctl 40046207 0 returned -16
binder: send failed reply for transaction 27 to 7739:7749
binder: send failed reply for transaction 28 to 7739:7763
binder: undelivered TRANSACTION_COMPLETE
binder: undelivered TRANSACTION_ERROR: 29189
binder: undelivered TRANSACTION_COMPLETE
binder: undelivered TRANSACTION_ERROR: 29189
binder: 7803:7806 BC_FREE_BUFFER ud57200c273e31c15 no match
binder: 7821:7828 BC_CLEAR_DEATH_NOTIFICATION death notification not active
binder: 7821:7828 unknown command 0
binder: 7821:7828 ioctl c0306201 2000dfd0 returned -22
binder: 7821:7840 BC_CLEAR_DEATH_NOTIFICATION death notification not active
binder: 7821:7840 unknown command 0
binder: 7821:7840 ioctl c0306201 2000dfd0 returned -22
device bridge0 entered promiscuous mode
binder: 7992:7993 ERROR: BC_REGISTER_LOOPER called without request
binder: 7992:7998 ERROR: BC_REGISTER_LOOPER called without request
netlink: 12 bytes leftover after parsing attributes in process `syz-executor6'.
binder_alloc: binder_alloc_mmap_handler: 8163 20000000-20002000 already mapped failed -16
binder: BINDER_SET_CONTEXT_MGR already set
binder: 8163:8169 ioctl 40046207 0 returned -16
netlink: 4 bytes leftover after parsing attributes in process `syz-executor6'.
binder: release 8163:8169 transaction 34 out, still active
binder: send failed reply for transaction 34, target dead
netlink: 4 bytes leftover after parsing attributes in process `syz-executor6'.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 8346 Comm: syz-executor6 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c71a9800 task.stack: ffff8800ad5c0000
RIP: 0010:[<ffffffff825bab57>]  [<ffffffff825bab57>] sg_read_oxfer drivers/scsi/sg.c:1976 [inline]
RIP: 0010:[<ffffffff825bab57>]  [<ffffffff825bab57>] sg_read+0xd17/0x1490 drivers/scsi/sg.c:530
RSP: 0018:ffff8800ad5c7b50  EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff825bab1e
RDX: 0000000000000000 RSI: ffffc900032b1000 RDI: ffff8801c9578170
RBP: ffff8800ad5c7c58 R08: 0000007461747364 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff10015ab8f30 R12: 00000000000000e9
R13: 0000000000000000 R14: ffff8800aeedef60 R15: ffff8801c9578140
FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f6ff6b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f6ef4db0 CR3: 00000000ad6be000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8800ad5c7bd8 ffff8801d9ba6128 0000000000000015 ffff8801c9578158
 b6034513d9854f85 ffff8801c9578168 000000000000010d 0000000000000000
 ffff8801d4a52000 0000000000001000 1ffff10015ab8f76 0000000020000064
Call Trace:
 [<ffffffff8151cf33>] __vfs_read+0x103/0x440 fs/read_write.c:432
 [<ffffffff8151edd3>] vfs_read+0x123/0x3a0 fs/read_write.c:454
 [<ffffffff81521719>] SYSC_read fs/read_write.c:569 [inline]
 [<ffffffff81521719>] SyS_read+0xd9/0x1b0 fs/read_write.c:562
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 97 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 6b 06 00 00 48 8b 1b 48 85 db 0f 84 3b 03 00 
RIP  [<ffffffff825bab57>] sg_read_oxfer drivers/scsi/sg.c:1976 [inline]
RIP  [<ffffffff825bab57>] sg_read+0xd17/0x1490 drivers/scsi/sg.c:530
 RSP <ffff8800ad5c7b50>
---[ end trace 00e685fec021e35d ]---