======================================================
[ INFO: possible circular locking dependency detected ]
4.9.84-ga9d0273 #44 Not tainted
-------------------------------------------------------
syz-executor3/13514 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
       SYSC_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
       SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
       do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
       entry_SYSCALL_64_after_swapgs+0x47/0xc5

       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
       vfs_ioctl fs/ioctl.c:43 [inline]
       do_vfs_ioctl+0x1aa/0x1140 fs/ioctl.c:679
       SYSC_ioctl fs/ioctl.c:694 [inline]
       SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
       do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
       entry_SYSCALL_64_after_swapgs+0x47/0xc5

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-executor3/13514:
 #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: 13514 Comm: syz-executor3 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c4dbf908 ffffffff81d956b9 ffffffff853a2cd0 ffffffff853a2cd0
 ffffffff853c3130 ffff8801b38320d8 ffff8801b3831800 ffff8801c4dbf950
 ffffffff812387f1 ffff8801b38320d8 00000000b38320b0 ffff8801b38320d8
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
 [<ffffffff815ae88a>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815ae88a>] do_vfs_ioctl+0x1aa/0x1140 fs/ioctl.c:679
 [<ffffffff815af8af>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815af8af>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
netlink: 112 bytes leftover after parsing attributes in process `syz-executor0'.
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/13597
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 0 PID: 13597 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d91f7678 ffffffff81d956b9 0000000000000000 ffffffff83c18e00
 ffffffff83f45be0 ffff8801d8c73000 0000000000000003 ffff8801d91f76b8
 ffffffff81dfccb4 ffff8801d91f76d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
netlink: 112 bytes leftover after parsing attributes in process `syz-executor0'.
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/13622
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 1 PID: 13622 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
netlink: 37 bytes leftover after parsing attributes in process `syz-executor5'.
netlink: 37 bytes leftover after parsing attributes in process `syz-executor5'.
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c33bf678 ffffffff81d956b9 0000000000000001 ffffffff83c18e00
 ffffffff83f45be0 ffff8801d8f81800 0000000000000003 ffff8801c33bf6b8
 ffffffff81dfccb4 ffff8801c33bf6d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/13670
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 1 PID: 13670 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c167f678 ffffffff81d956b9 0000000000000001 ffffffff83c18e00
 ffffffff83f45be0 ffff8801d8aa9800 0000000000000003 ffff8801c167f6b8
 ffffffff81dfccb4 ffff8801c167f6d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/13723
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 1 PID: 13723 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cb3e7678 ffffffff81d956b9 0000000000000001 ffffffff83c18e00
 ffffffff83f45be0 ffff8801c1001800 0000000000000003 ffff8801cb3e76b8
 ffffffff81dfccb4 ffff8801cb3e76d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/13765
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 1 PID: 13765 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d88a7678 ffffffff81d956b9 0000000000000001 ffffffff83c18e00
 ffffffff83f45be0 ffff8801d8d5c800 0000000000000003 ffff8801d88a76b8
 ffffffff81dfccb4 ffff8801d88a76d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/13816
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 1 PID: 13816 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c2267678 ffffffff81d956b9 0000000000000001 ffffffff83c18e00
 ffffffff83f45be0 ffff8801cb683000 0000000000000003 ffff8801c22676b8
 ffffffff81dfccb4 ffff8801c22676d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor5/13828
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 1 PID: 13828 Comm: syz-executor5 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c531f678 ffffffff81d956b9 0000000000000001 ffffffff83c18e00
 ffffffff83f45be0 ffff8801d84cb000 0000000000000003 ffff8801c531f6b8
 ffffffff81dfccb4 ffff8801c531f6d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/13865
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 0 PID: 13865 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d7967678 ffffffff81d956b9 0000000000000000 ffffffff83c18e00
 ffffffff83f45be0 ffff8801d877b000 0000000000000003 ffff8801d79676b8
 ffffffff81dfccb4 ffff8801d79676d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/13893
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 0 PID: 13893 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c21af678 ffffffff81d956b9 0000000000000000 ffffffff83c18e00
 ffffffff83f45be0 ffff8801d7c03000 0000000000000003 ffff8801c21af6b8
 ffffffff81dfccb4 ffff8801c21af6d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/13938
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 1 PID: 13938 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c22e7678 ffffffff81d956b9 0000000000000001 ffffffff83c18e00
 ffffffff83f45be0 ffff8801d8540000 0000000000000003 ffff8801c22e76b8
 ffffffff81dfccb4 ffff8801c22e76d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
check_preemption_disabled: 3 callbacks suppressed
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/14111
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 0 PID: 14111 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cbf8f678 ffffffff81d956b9 0000000000000000 ffffffff83c18e00
 ffffffff83f45be0 ffff8801d785b000 0000000000000003 ffff8801cbf8f6b8
 ffffffff81dfccb4 ffff8801cbf8f6d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/14164
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 0 PID: 14164 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d9917678 ffffffff81d956b9 0000000000000000 ffffffff83c18e00
 ffffffff83f45be0 ffff8801d8588000 0000000000000003 ffff8801d99176b8
 ffffffff81dfccb4 ffff8801d99176d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor4/14330
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 0 PID: 14330 Comm: syz-executor4 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ce597678 ffffffff81d956b9 0000000000000000 ffffffff83c18e00
 ffffffff83f45be0 ffff8801d5661800 0000000000000003 ffff8801ce5976b8
 ffffffff81dfccb4 ffff8801ce5976d0 ffffffff83f45be0 dffffc0000000000
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81dfccb4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff81dfcd1c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff833fe7a8>] ipcomp_alloc_tfms net/xfrm/xfrm_ipcomp.c:286 [inline]
 [<ffffffff833fe7a8>] ipcomp_init_state+0x188/0x930 net/xfrm/xfrm_ipcomp.c:363
 [<ffffffff8336aa60>] ipcomp4_init_state+0xb0/0x7d0 net/ipv4/ipcomp.c:137
 [<ffffffff833dcdd7>] __xfrm_init_state+0x3e7/0xb30 net/xfrm/xfrm_state.c:2096
 [<ffffffff833dd53a>] xfrm_init_state+0x1a/0x20 net/xfrm/xfrm_state.c:2122
 [<ffffffff83577b09>] pfkey_msg2xfrm_state net/key/af_key.c:1289 [inline]
 [<ffffffff83577b09>] pfkey_add+0x1fb9/0x3470 net/key/af_key.c:1506
 [<ffffffff8356f5fb>] pfkey_process+0x68b/0x750 net/key/af_key.c:2834
 [<ffffffff83570e59>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3678
 [<ffffffff82ed8baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed8baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82eda7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82edc7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82edc8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82edc8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5