======================================================
[ INFO: possible circular locking dependency detected ]
4.9.84-ga9d0273 #52 Not tainted
-------------------------------------------------------
syz-executor2/14577 is trying to acquire lock:
(&mm->mmap_sem){++++++}, at: [<ffffffff814c2714>] __might_fault+0xe4/0x1d0 mm/memory.c:3993
but task is already holding lock:
(ashmem_mutex){+.+.+.}, at: [<ffffffff82d4aef1>] ashmem_pin_unpin drivers/staging/android/ashmem.c:714 [inline]
(ashmem_mutex){+.+.+.}, at: [<ffffffff82d4aef1>] ashmem_ioctl+0x371/0xfe0 drivers/staging/android/ashmem.c:791
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
lock_acquire+0x12e/0x410 kernel/locking/lockdep.c:3756
__mutex_lock_common kernel/locking/mutex.c:521 [inline]
mutex_lock_nested+0xbb/0x870 kernel/locking/mutex.c:621
ashmem_mmap+0x53/0x400 drivers/staging/android/ashmem.c:379
mmap_region+0x7dd/0xfd0 mm/mmap.c:1694
do_mmap+0x57b/0xbe0 mm/mmap.c:1473
do_mmap_pgoff include/linux/mm.h:2019 [inline]
vm_mmap_pgoff+0x16b/0x1b0 mm/util.c:329
SYSC_mmap_pgoff mm/mmap.c:1523 [inline]
SyS_mmap_pgoff+0x33f/0x560 mm/mmap.c:1481
do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387
entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
check_prev_add kernel/locking/lockdep.c:1828 [inline]
check_prevs_add kernel/locking/lockdep.c:1938 [inline]
validate_chain kernel/locking/lockdep.c:2265 [inline]
__lock_acquire+0x2bf9/0x3640 kernel/locking/lockdep.c:3345
lock_acquire+0x12e/0x410 kernel/locking/lockdep.c:3756
__might_fault+0x14a/0x1d0 mm/memory.c:3994
copy_from_user arch/x86/include/asm/uaccess.h:705 [inline]
ashmem_pin_unpin drivers/staging/android/ashmem.c:719 [inline]
ashmem_ioctl+0x3c0/0xfe0 drivers/staging/android/ashmem.c:791
compat_ashmem_ioctl+0x3e/0x50 drivers/staging/android/ashmem.c:822
C_SYSC_ioctl fs/compat_ioctl.c:1602 [inline]
compat_SyS_ioctl+0x15f/0x2050 fs/compat_ioctl.c:1549
do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387
entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(ashmem_mutex);
lock(&mm->mmap_sem);
lock(ashmem_mutex);
lock(&mm->mmap_sem);
*** DEADLOCK ***
1 lock held by syz-executor2/14577:
#0: (ashmem_mutex){+.+.+.}, at: [<ffffffff82d4aef1>] ashmem_pin_unpin drivers/staging/android/ashmem.c:714 [inline]
#0: (ashmem_mutex){+.+.+.}, at: [<ffffffff82d4aef1>] ashmem_ioctl+0x371/0xfe0 drivers/staging/android/ashmem.c:791
stack backtrace:
CPU: 0 PID: 14577 Comm: syz-executor2 Not tainted 4.9.84-ga9d0273 #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
ffff8801d4397a38 ffffffff81d956b9 ffffffff853a2cd0 ffffffff853a2cd0
ffffffff853c32e0 ffff8801d36708d8 ffff8801d3670000 ffff8801d4397a80
ffffffff812387f1 ffff8801d36708d8 00000000d36708b0 ffff8801d36708d8
Call Trace:
[<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
[<ffffffff812387f1>] print_circular_bug+0x271/0x310 kernel/locking/lockdep.c:1202
[<ffffffff8123ec29>] check_prev_add kernel/locking/lockdep.c:1828 [inline]
[<ffffffff8123ec29>] check_prevs_add kernel/locking/lockdep.c:1938 [inline]
[<ffffffff8123ec29>] validate_chain kernel/locking/lockdep.c:2265 [inline]
[<ffffffff8123ec29>] __lock_acquire+0x2bf9/0x3640 kernel/locking/lockdep.c:3345
[<ffffffff812400ae>] lock_acquire+0x12e/0x410 kernel/locking/lockdep.c:3756
[<ffffffff814c277a>] __might_fault+0x14a/0x1d0 mm/memory.c:3994
[<ffffffff82d4af40>] copy_from_user arch/x86/include/asm/uaccess.h:705 [inline]
[<ffffffff82d4af40>] ashmem_pin_unpin drivers/staging/android/ashmem.c:719 [inline]
[<ffffffff82d4af40>] ashmem_ioctl+0x3c0/0xfe0 drivers/staging/android/ashmem.c:791
[<ffffffff82d4bb9e>] compat_ashmem_ioctl+0x3e/0x50 drivers/staging/android/ashmem.c:822
[<ffffffff8167d34f>] C_SYSC_ioctl fs/compat_ioctl.c:1602 [inline]
[<ffffffff8167d34f>] compat_SyS_ioctl+0x15f/0x2050 fs/compat_ioctl.c:1549
[<ffffffff81006f95>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
[<ffffffff81006f95>] do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387
[<ffffffff838b6b10>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
audit: type=1400 audit(1519644012.766:88): avc: denied { getattr } for pid=14789 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
audit: type=1400 audit(1519644013.066:89): avc: denied { create } for pid=14913 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_crypto_socket permissive=1
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=59001 sclass=netlink_route_socket pig=15430 comm=syz-executor7
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=59001 sclass=netlink_route_socket pig=15447 comm=syz-executor7
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
audit: type=1400 audit(1519644014.696:90): avc: denied { shutdown } for pid=15581 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device /dev/vga_arbiter
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
audit: type=1400 audit(1519644015.936:91): avc: denied { read } for pid=15904 comm="syz-executor0" 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
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
9pnet_virtio: no channels available for device ./file0
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audit: type=1400 audit(1519644019.946:92): avc: denied { net_broadcast } for pid=17211 comm="syz-executor1" capability=11 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
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